🔧 BUILD Broke EF turbo LS SC400 Build

General Information

I may have never posted on here before, but for some reason I am inspired to post my build up here. I am going to copy and paste from another site to get us all up to speed. I will try and clean up anything that was specific to the thread I am pulling from. Now that I am getting started on the main fab work I will update this thread in real time.

For anyone who doesn't want to read it all here is the short version. I bought the car on a whim in June of 2016. It is a 1993 SC400 that was from this area, and was meticulously maintained at the dealer. I was going to stay with the original 1UZ so you will see I started installing a procharger on it. I ended up selling off the stock motor, trans, ecu and harness to a local guy and got an iron gen 3 5.3 motor. I am doing a Precision LS-7675 turbo with a truck manifold based kit (more or less). It will be backed up by a TH400, and for now will use a stock ECU with HP Tuners.

Alright, time for the massive dump of info.


A couple years ago I picked up a 1993 SC400. I wasn't really looking for a car, but a late night search found this one, and I have always liked them. I decided to go down and give it a look in person, and it was even cleaner than it looked in the pics so I bought it. Here are a couple pics of when I first got it.

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I wont bore you with all of the middle shit, just hit you with the highlights.

I removed a couple tons of wiring that used to be an alarm system.
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I had the gauge cluster fixed/updated with white LED's.
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Fixed up the wiring that was kind of hacked up from the alarm. Changed the steering wheel, etc. etc.
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I then updated the climate control, and put in a nice head unit.
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Just a bunch of little changes and fixing up small things here and there. The car was extremely well maintained and really did not NEED much. My plan was always to make it fast of course, and do drag week with it. The factory 1UZ motor is a very good starting point and can make some really solid HP. The stock trans can be built to live as well. Packaging was kind of a nightmare as you can see, but other than that it was a good option.

I ended up stumbling upon a great deal on a procharger kit that was actually on an SC400 locally. It was a P1SC that came with some shitty piping, a way too small intercooler, but a Tial blow off valve that actually had the right spring it it! I started installing that setup.
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You can see one of the things that was constantly in the back of my mind for making this a drag week car. Look how complicated that engine looks! If I had a problem on the road not only would parts be an issue, but just the time to do simple repairs is a nightmare. For example the starter is under the intake manifold in the valley.

So when a local kid hurt the motor in his SC I offered mine up to get him back on the road since that is his only car. We struck a deal and I ripped that shit out the next day.
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It happened to work out that a 5.3 LS came up for sale for the same money I just sold my old motor for, so I jumped on it.
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Its update time! Nothing really exciting, but I have been slowly chipping away at things.

First up was wiring. I am planning on using the stock ECU for a little bit with HP Tuners, so I had some wiring work to do.

Harness as I got it with the motor
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Stripped of all of the brittle loom and crappy electrical tape.
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Unfortunately I ended up having to move it around after I had stripped off all of the crap, and it got pretty tangled.
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So I decided to just fully depin everything since I only need a few things from that mess.
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Here is the pile of junk I didn't need from that harness. There is actually a bit more, but that is 99.99% of it.
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And here is everything all apart, ready to be cleaned, routed, extended, and loomed.
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Next up I got some mounts for the LS from Dan Perlenfein. He even made me a custom trans mount for the TH400. These are very nice pieces, and I got them really quickly.
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Got them set in the car, fit like a glove! (BTW they are not bolted down in any of these pics, just have the nut on the other side a few turns)
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Next up I pulled the oil pan off my motor so I could drop it in and see what I am working with.
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Bit of wishful thinking seeing of the truck intake would clear the hood. It wont.
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So keep in mind that the mounts are not 100% bolted down yet. I need to get my trans from my buddy so I can get that in place before locking everything in place (just to take it all back out again). Once I have put the trans in then I can check a few things, and it can all come back out. Engine bay is going to get cleaned up, and the motor will get some TLC as well. I am still planning on trying to get it running and driving this year, but we will see if it happens. I am not one to let things be "good enough" so I may end up spending a bunch of money and time on the motor even though it will remain a stock bottom end.

Anyway I am really happy with the fitment, and how much space I have! This seems to be more room than I remember in an F-body (on the sides) even with a tubular K-Member. Should be able to get a big single in there no problem with a 4" down pipe to run out back. I am really glad I went LS!



Well time for a small update on the thread that nobody follows :) I got the trans, and a converter from my buddy a while back. Turns out the trans was shot, and needs a rebuild. That pretty much killed my plans for just getting it running this year. The good news is that I will be able to use it as a core to verify the trans mount, and hold everything in place so I can do all the fab work and wiring. I need to get un-lazy and move the car over in the garage so I can get the trans in one of these days. Its been hot as balls, and until I got my turbo there hasn't been much of a reason to bother getting it done. That excuse is out the window now though, since this came in last week

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Its nothing special, just a Precision LS 7675, which is a cast wheel journal bearing 76mm. It should be able to max out the 5.3 though, so it will do for now. This weekend (it was hot as balls) I went out to the garage for a bit to try and get some idea where I was going to place the turbo so I can start getting an idea for a materials list. First up I got the radiator sitting in place (close enough)
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These were the most obvious positions (turbo would need to be clocked differently for most) that I snapped some pics of not in any particular order.

Inside forward facing 45
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TA style
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Inside forward facing
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Outside forward facing
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That is really about all I got right now. I guess I also got the LS6 intake since my last update. That is still sitting on the truck steam ports which is why it isn't flat. I also got a set of non-EGR truck manifolds to use as the base of the turbo kit.

So right now I need to get everything mounted temporarily. That includes the trans, front accessories, exhaust manifolds, intake manifold, etc. Then I can lock down the turbo placement 100% and order material to start work. I also need to delete the ABS so I can mount the ECU over there and get started on the wiring. Well that's all for now, thanks for following along the journey of me seeing how dirty I can get my car.



Time for a small update, just because why not :)

I needed to get the trans in so I could check the fitment of the mount, as well as get everything locked into position for fabricating. Doing a trans by yourself is no fun, worse when you don't have a lift, and worse yet when you have to do some modifications for it to even fit. I ended up grabbing a trans jack from Harbor Freight to make my life a million times easier.
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The only downside to it is that it is quite a bit taller than having the trans on my regular jack, but other than that it was SO MUCH BETTER. I could slowly move it into position and make small changes to angle and overall position with ease. Not to mention how nice it is to have the trans stable as you are moving around to get a good look at everything. It turns out it only needed a little massaging to get it bolted into place. Again, that is without a shield on it (or a bell) but I was glad I didn't have to spend hours hammering overhead.

Ignore the mess, the garage is in process of getting a lot of work as well.

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Next up I wanted to see what I was working with on the exhaust manifolds.
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Driver side is actually hitting the frame, but that is fine since I always planned on v-banding them anyway.
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Plenty of space on the passenger side
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Next up was trying to get an idea of what to do for accessories. There are about a million options out there these days. I started by trying to place the stock truck pieces just to get some idea.
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Clearly those weren't going to work, but it was worth a shot. I have since figured out what I am going to do, but I will post more about that when I get all the parts. After that I reassembled the main fuse box under the hood. I need to patch where I cut for the procharger bracket, but the car is going to be outside for a bit while we finish the garage so I wanted to close off the fuses and wiring.
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That was about it. Got the car back on the ground and pushed back out of the way for now.
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Not really a crazy update, but progress none the less. While we are finishing the garage I will get the rest of the parts needed for the accessory drive setup. Once that is all in place I can start on fab work (FINALLY!), so hopefully the garage wont take too long. That's all I got for now, thanks for following along!



Nothing exciting, but parts have been coming in lately. I had to figure out and order up all of the front accessory drive components. Luckily there are a LOT of options for that kind of stuff these days. I ended up with a set of ICT billet brackets that will use a mix of F-body and Truck pieces.

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While I am at it, I got all new everything else too since most of it required f-body pieces anyway.

New tensioner
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New power steering pump pulley
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I have a new water pump, but no pic of it. The new power steering pump will be here early next week as well. I haven't ordered an alternator yet, but I will later when I get a crank pulley.

Next up is some of the fabrication pieces for the turbo kit. I have only ordered the parts and pieces for the hot side so far.

All stainless steel T4 flange, four 2.5" 90's for the crossover, and a 4" 90 for the start of the down pipe
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The stainless steel adapter from the weird 3-5/8" outlet of the turbo to 4" tubing.
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I am still waiting on the 2.5" stainless v-band assemblies and the stainless O2 bung. I will also run another section of stainless on the downpipe, then a bellows, then adapt to aluminum for the rest of the exhaust. I probably wont start on that until after I do the cold side piping, which I will hopefully be able to start directly after the hot side fabrication is done. My garage is currently being finished, so I wont be able to start work for a couple weeks still, but its great to see parts coming in! That's all I got for now, thanks for following along.


Here are the 2.5" stainless steel v-band assemblies and the stainless steel O2 bung.
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They are very nice with indexed flanges built in
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Quick release clamps, another nice touch!
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GM reman power steering pump came the other day as well
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I was a bit surprised to see that the pump did not come with the pulley bolt, or the reservoir cap. Not a big deal, just slightly annoying. That is all I have for now. The garage is taking longer than expected, but I have also been working on the wife's car anyway. Sometime next week I will probably stock up on welding supplies so I can be ready to go. I should have enough to get started, but I know I will need some soon.




On to a bit of news, my garage is 90% done!! Paint went on last night, so now I can trim it this weekend and move everything back. Here are a couple quick pics.

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For reference, here is a pic of the garage when we did our inspection (before we bought the house)
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It had a single light bulb, and the opener was plugged into an outlet next to the switch with an extension cord duct taped to the drywall.

Here is a shot after we had added the sub panel, lights, and pulled down the drywall. I then insulated everything, and put up new 5/8" drywall.
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I know not car related, but it has been a massive project that has delayed the car so I figured I would throw it in there now that I can see light at the end of that tunnel. Next update will be all car!



Well nothing too exciting to report still. I have been busy as hell finishing the garage, and getting our house ready for a party this weekend. I did however order up a bunch more material and pieces. I should have everything to build the intercooler piping except the intercooler (which is on backorder). I have all of the material to build my exhaust, but will probably need a couple v-bands so I can section it. Anyway, here are a couple pics.

Half stainless, half aluminum 4" V-band. I have two stainless steel 90's to come out of the turbo and get me to about the firewall, then it will be aluminum from there to the bumper. The other three pieces are 3" aluminum clamshell clamps for the intercooler piping.
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Detail of the 4" v-band
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And one of the clamshell clamps pulled apart.
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I also got two boxes of piping as well. Those have a single stainless steel 4" 90, ten 3" aluminum 90's, six 4" aluminum 90's, two 4" aluminum 45's, two 2' long aluminum straight sections, a 3" silicone coupler, and a 3" to 3.5" silicone adapter with T-Bolt clamps. I am really hoping to start fabrication next weekend now that I should be done with all of these other projects. My pile of parts/material is starting to take up too much space!




Finally time for a bit of an update! After busting our asses on Friday night, the garage is now 99% done. All that really means for non OCD people is that I have more than 2 outlets (a LOT more) and don't need to drag extension cords all over! Let me back up a second, I needed to get the steering rack out of the car since it was wore out and I got a replacement for it. I also wanted to take the motor out to make taking the rack out easier, and so I could do some things with it on the stand. Thursday night I got under the car and pulled the trans.

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Pretty easy to do with nothing really connected at all. Friday the car and the bike went outside while my buddy and I did the massive amount of electrical work in the garage. Saturday got mostly eaten up cleaning the garage from the previous nights thrashing. In the evening I got the car pulled back into the garage and was able to get back to work on it.

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I let the snow melt off and dry up a bit before getting to work pulling the motor. Not terribly hard (again, nothing to disconnect or move), but kind of a pain in the ass since I have to come at it from the side.
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So one of the first things I wanted to try, was see about fitting AC. I don't think I would run it this year, but if I could build with it in mind it would make things easy down the road. I grabbed a bracket and a junk compressor from a buddy so I could mock it up. He also had this manifold laying around, so I took that as well.
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It is clearly a tight fit, but I think I could make it work. It pretty much kills running a 4" downpipe on the passenger side though, so I grabbed a piece of tubing to see what it looked like on the driver side.
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Again, very tight but I should be able to make that work if I need to. I still haven't decided if I am going to mess with it or not, but its good to know about options. Next up was getting the front accessory drive all installed.

All laid out on the bench (minus the water pump since I forgot where I put it!)
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Unfortunately I have the wrong tensioner, and I clearly still need parts (balancer, thermostat housing, alternator, etc.) but I can move forward with fabrication for now. Once that was done I pulled out the old rack.
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Then I got the new poly bushing installed in the new rack
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Then got it put in for now.
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I am going to change the "EVO component", intermediate shaft, and outer tierods but its in the car so I can fabricate around it for now and keep it out of my way.

Then I got busy organizing all of my material so I could clear the space under my bench.

Pile of tubing!
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Ahhhh thats better
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At that point I was going to call it a night, but I decided to dive in and try and get something done. So I busted out the big boy grinder
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Then I hacked off the end of the driver side manifold
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Unfortunately, that was where I had to end it. Its been so long since I have welded, the batteries in the hood were dead! I am going to stop and get some on my way home today, and I am also waiting on some welding supplies. It was great to FINALLY be working on the car again! Like I said I am still unsure on the whole AC deal, but I think for now I am going to cut up that manifold and see whats up. I will also be putting the motor back in the car as soon as I get my new steering parts (that is a whole story on its own). Thats all I have for now, thanks as always for following along!




WHEW, that was a lot of info! I ended up having to pull the post from a site I had already done this same thing on. So I again apologize if it doesn't make a ton of sense since it was a catch up on a catch up. Going forward this will get updated in real time though. I have some tools and supplies coming this Friday, so hopefully I can get a good jump on some of the fab work. I guess we will see how it goes. Look for an update later in the weekend, or Monday. Hope you guys enjoy the build, I look forward to hearing from you guys.


Thanks,
Sean

Broke EF

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Man what a fucking weekend! I figured swapping out the injectors and the pump would take a couple hours. Boy howdy was that wrong! Lets start at the beginning.

Lets start by getting the car up on the lift
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I started draining the lines, and took off the rails and injectors.
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New injectors with the new injectors and spacers.
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So here is one of a few problems
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The top o-ring is the one that came on the injectors at the intake side. The lower fat one came with the sapcers and said on the package and said to use on the intake side for LS1 or LS2. I have an LS6 intake, which is basically the same as the LS1 so I swapped them. More on that later :)

New injectors all set up (kinda) vs the old ones.
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Once that was done I moved on to replacing the diaphram in the fuel pressure regulator.
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Id say that the old one was due to be replaced!

Once that was all done I got the old pump out
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My initial plan was to mounte the new pumps the same way the old one was. You can see that the outlet side (top) on the old pump is a female AN fitting. That was connected directly to the post filter. I dont know why I didnt think about this, but the outlet of the new pump is larger (-8 vs -6). Regardless, that wouldnt have worked out since it put the pumps too low under the car. So that meant I needed to make a line from the pump to the post filter which had the benefit of alowing me to put the pump wherever I wanted. Long story short there is really nowhere to put it besides where the pre filter was living. After a lot of messing around with shit this is what I came up with it.

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And here it is all mounted up, wirded, and plumbed
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The -8 from the pump to the post filter, that was literally all of the PTFE line I had. I spent so much time yesterday checking what I had for fittings, and line, and how I could make that work. I wouldnt say its my favorite configuration, but it works. I had one leak this morning, and of course it was that -8 line. I was able to get it taken care of by just tightening up the hose end a bit.

The big issus was those o-rings. When I got everything done last night I ran the pumps and didnt notice that it was just dumping fuel out of every single injector! Those fat o-rings did not fit down into the intake. Luckily I changed to the stock ones and that took care of it. I got it wrapped up around 11 last night, except the injector connectors. Almost forgot about that, these are EV6 injectors, and I got EV14 adapters. Amazon came in clutch though and delivered at 4AM, so first thing this morning I was able to throw them on and set the fuel pressure. I got it set to 45 with probably half the adjuster left to go, whereas before it was ran way down to get that. I am pretty sure a lot of my issue was the diaphram being worn out on the FPR.

Now to the good stuff, the track.
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First pass
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I forgot to turn on the second fuel pump, so It damn near shut off for a seocnd so kind of a throw away for ET. I was able to verify that the fuel system was doing great though, so that was good.

Pass two
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No change on this one, just remembed the second fuel pump this time.

Pass three
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So on this pass I sped up the ramp about a second. I think I also gave the launch 1 more psi of dome pressure.

Pass four
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Ummm, there was basically no change for this run. Thats not entirely true, but close enough without getting technical.

Pass five
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On this one I tried to up the launch boost (a lot) but with my current launch RPM and timing (two step) it still only made about 4.5psi of boost. I also gave the top end just a touch more boost cause it was slightly low all day.

After that I packed it up and headed home kinda disapointed.
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It was a good day at the track. I drove it back on the trailer under its own power, I verified the fuel system is doing what it needs to do. I just need to figure out what makes the tune up happy. It is a little on the rich side, and not very agressive on the timing. I know just enough to be dangeous with that though, so I try not to mess with it too much on my own.

During the week I am going to do a full service health check. I want to do a compression test, nut and bolt everything, check fluids, probably new plugs etc. I sent the data logs and the tune to the tuner to check it all over. I did talk to him on the phone today for a bit of a sanity check. I was also talking with another sick summer competitor and all of us agreed that the data logs looked good each pass. Nothing jumped out as being an issue at least :) Assuming everything is good, I want to get back out ASAP and make this thing go fast!
 

Broke EF

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I know you wanted more but the car is in one piece, seems to not be having the issues it did before and you've got more in it. Lot there to be happy about. The time will come.
You're not wrong. It could be much worse, I just know how much better it should be and its annoying. I needed more traction, fixed that and had issues with fuel. I fixed the fuel issue, and gave myself more room to turn it up, and its slower. So best 60' its ever gone, everything turned up a little, power ramped in WAY earlier in the run and barely got a 9 second pass and 4ish MPH slower. Just makes no sense, but I will figure it out.
 

Broke EF

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Small update. I think I have figured out most of what was going on at the track last time out. After talking to some people and looking over my logs I think I had a couple things happening compared to my current PB. For starters the most obvious answer is she was LEAN before. I have seen as high as 220% duty cycle on my injectors to give you guys an idea of just how lean. With that not happening anymore, I was likely down a bit of HP. The other less obvious difference is timing. My car right now is SUPER conservitive on the timing. It has an advanced table that adds timing based on ethanol content, and it ramps from 60% (I dont really remember) and isnt the full timing change until 80%. Well I have never even had 80% ethanol ever, so its always living somewhere on that ramp. I know I had 77 or 78% on the last day at Cordova, and right now in the car is like 74-75% That knocked down the timing 1-2 degrees.

That doesnt exactly explain everything, such as why speeding up the ramp didnt make it faster, but it at least helps explain why it wasnt overall faster than it had been. I have a handful of pretty big changes I am going to make for the next time out. I wont bore you guys (any more than I already have) with all the details. Lets just say I have a lot left on the table, such as 6+ degrees of timing while still being pretty safe. There is also no reason that I cant max out what this turbo can do, and that should be a good amount faster than its been so far. I am excited to get back to the track soon!
 

Broke EF

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Yesterday was pretty beautiful weather, and Byron had a Drag Radial night so I loaded up and headed over after work.

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I was pretty excited, the track was great and I had a lot of things to try out. So I quickly got it unloaded and made the first round of changes to the tune up. The good news is that it made good boost on the brake, and the track took it. First pass was slow, so I started to scour the data to see what is going on and I saw the same low timing again.

As I was freaking out I found that the timing table for ethanol was set to come on at 100PSI of boost LOL. Either it got fat fingerd, or I changed it at some point, or whatever. I got that changed to trigger on the trans brake at least for now. I also dropped the launch boost 1 psi just to be sure I wouldnt blow the tires off with the additional timing.

Run two was better but still well off pace, espcially since I gave it more timing. Logs looked fine, and I was getting frustrated so I turned it up more. 2 more degrees, more launch RPM and boost, more peak boost, ramped in faster. ALL THE SAUCE!

Run 3 felt pretty good actually. I think I may have lifted a tire ever so slightly. I got the slip and it was still slow! By then it was getting late anyway so I just loaded up. While loading up I noticed that there was water all over the trunk. That means water filled the front expansion tank, went into the rear overflow, and over flowed that. Not ideal.

I havent done much yet today, but here is what I have seen so far.
Pressurized the cooling system, it was fine. Held pressure for probably 15-20 minutes.
Plugs on driver side look great. Timing mark looks good, no signs of detonation, nice and dry, even color etc.
The front expansion tank (think overflow that feeds from the bottom so the water can go back into radiator) was dry.
Rear overflow that is fed from the top of the expansion was full of water.
Oil looked totally find on the dipstick.

I still need to pull the passenger plugs, drain (change) the oil, do a compression test, maybe do a leak down but I need to buy a tester to do that. I am not seein a smoking gun yet, and its not making me warm and fuzzy.
 

Broke EF

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4,557
The sticks
I am thinking I am going to be calling it a season. After talking to some people I am fairly confident that its lifting the heads. I am still going to do more checking but its likely thats what happened. The other issue is it seems like my turbo is just flat out of steam. I was worried about that, but I was hopeful it would run out closer to the 1,000 HP mark rather than 800 HP it looks like. So I have some decisions to make. I will keep you guys up to speed as I get everything checked over and torn down.
 

Broke EF

TCG Elite Member
Dec 8, 2017
1,789
4,557
The sticks
It's update time!! I couldnt just leave it alone, and end the season on some weak ass 10 second runs. I pretty much immediately pulled the plugs on the driver side. They looked good, no signs of detonation, timng marks were good, all dry etc. With the exhaust on, taking off the passenger side is a bit more work so I didn't get to those until yesterday. In the meantime I had been talking to anyone who would listen about whats going on with my car and what they think. The general concensous was it may have lifted a head, but you cant really tell without just replacing the head gaskets. I also reviewed some things with the tune and the logs. I had some things to try for sure, so I wanted to make sure it was good. I was thinking some day this weekend, and then a friend of mine asked if I wanted to go up to GLD Friday. Seemed like a good day for weather (Sunday had a higher chance of rain, and I cant go Today) so I had a deadline now.

Yestersay I got to work by removing the passenger seat and the harness. For anyone who doesnt know, the stock front seats are VERY heavy in these cars. I havent weighed it, but I have seen 60-70lbs and that seems about right.
i-cGNz9Cq-X4.jpg


Next up was getting the exhaust off, so I could remove the downpipe. Here you can see how I join the exhaust to the downpipe, with just a slip fit.
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I originally planned on doing a v-band connection there, but because of time a while back I went with a slip fit. It works great, but its a bit of a bitch to get apart, but I got it eventually.
i-mxPLk6X-X2.jpg


Once that was done I got the downpipe out of the way, and pulled the passenger plugs. They also looked great, no areas of concern that my simple brain could see. With that check done, I did a compression test. It was lower than the last time I did one, but that could be a lot of things. It was even across...most of them. One hole was lower both times I have done a compression test, but not low enough for me to have any sympathy for it :D

With that checked out, I gapped some new plugs a bit tighter and thew them in. Got everything all bolted back together also with a higher pressure radiator cap as well. I reset the fuel pressure cause it was running a bit high with both pumps on. Lastly I tensioned the belt cause it was a little loose. I shouldnt have powder coated the tensioner.
i-cwP25Z5-X4.jpg


With that all done I got her loaded up and ready to go.
i-56fM55w-X4.jpg


Got to the track and got all teched in and made the changes to my tune up. I was still really agressive on the ramp rate, so it spun really bad, BUT the MPH was back up so I knew it was on the right track. Second run I made some small adjustments to the tune up and it finally all came together!
i-8SdVNdK-X2.jpg


The next pass, all I did was remove the turbo guard. I dont actually think it changed anything, but I will overlap the logs to see if anything happened. Anyway here is the slip!
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And here is a video of the pass


I tried to turn up the launch a little bit on the next pass and it just spun. Went around again and same result so I called it a night since they were closing soon anyway. Sitting here I have some ideas I would like to try to get a little more out of it. I dont know if I will take it out again this season, or just tear it apart. Or leave it alone and hope it sells sooner or later. I didnt beat my own personal best this year (9.44 @ 148) but I dont think this combo will get me there so thats OK. Like I have said I hoped this turbo would put out a bit more power than it is. I probably have a small boost leak which is robbing some power, but I dont think its much. Maybe I will actually check one of these days, but probably not :D
 

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