🔧 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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Dec 8, 2017
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Look, a giant box showed up today!

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Lets take it in the house to open it :D
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Back to the garage for some better lighting
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I am not really a fan of vented hoods, but I think this one looks pretty good. Some other options for this car a terrible. I have enough issues with temp I figured going vented should help somewhat. I am going to line the area above the downpipe with the gold heat shielding to help not melt the hood. I also have some Aero catch hood pins for it as well. It does have a latch, so I am debating pins only, latch only, or both. Probably will go pins only, but not sure yet.
 

Broke EF

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Well today I started on the hood. It looks OK, and its lighter than stock, but is pretty eh overall. For example I had to cut some holes for these hooks that are part of the hinges.
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You could see the marks where the hole is factory, but they leave it closed so I hole sawed it. Once we had it off to do that I started on the gold heat shielding.
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It took a while, but I am pretty happy with how it came out. Not perfect, but good enough.
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Once that was done we threw it back on.
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Then I started the long task of deciding where the hood pins would go. Once I had a spot I laid them out.
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And then just went for it :D
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I am going to borrow some templates my buddy has from way back when to make marking out the holes a lot easier. So thats all for that project right now other than I did clean it up after the pics.

Then I moved on to something really simple, replacing headlights. I bought new HID's last year right before Drag week, and broke the driverside bulb putting it in. I decided to change them to LED this time around. The passenger side was no issue just like the high beams. But the driverside... First one of the tiny set screws that hold the collar to the body would not come out, so I just drilled it. Then I went to put it in the housing so could index the bulb, and it wouldnt even fit.
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Quick measuremet shows that there is no chance.
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This headlight was a replacement after the car got hit but I checked, and all SC's from 92 to 2000 have the same bulbs. Who knows what happened to it before I got it. Not sure if I am going to do a whole lot about this.

Well that concludes my car vacation. I start my new job tomorrow which is great, but also I want to just keep working on the car! I will probably keep taking care of small things throughout the week. I need to get my license, so I need the car to be ready to go. I should be getting some replacement sensors this week so I can get the boost controller working. That way even if I struggle with the hit I can crank up the power down track to get my license :D
 

Broke EF

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Dec 8, 2017
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So I attempted to get my NHRA license today, and failed miserably. Lets back up a bit though to last night. I had to do a few things to the car to get it ready for today. First up was changing the dome pressure sensor. It wasnt reading, and if anyone remembers the dome pressure sensor wiring was what melted and shorted at Drag Week so that sensor probably go fried in the process. Well that is all fixed now :)
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New sensor, new wiring, and I verified all the wiring just to be double sure its right.

Next up I swapped out my torque converter bolts. I had the "long" ARP bolts in there, they are 1.25" and they ended about half way into the nut. That wont do, so I swapped them for some fresh grade 8 bolts that are the right length. Good thing too, since two of them were lose enough to take out without tools :D

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I buttoned up some other little odds and ends, and was ready to go.
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I need to get those water spots off somehow. Also I took the hood off because I havent finished cutting for the hood pins. I need to borrow my buddies jig for them (to make it easier) and havent gotten over there yet to do so.

I also decided to get the trailer hooked up and ready to save time in the morning.
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This morning I got up and loaded the car, and then headed to Byron.
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I got all set up, got through tech and got into the lanes for my first hit
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And it was terrible
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So it wheel hopped really badly which it has never done before, I peadled it and then the boost was running wild and it hit boost cut. I lifted and shifted second, got back into it just for it to give me ALL the boost agin and cut out again. I tried lifting and getting into it again but no dice.

Lukily my buddy Mike showed up right about then and got to work on the laptop making some adjustments.
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I go back up, and many hours later make another hit, basically still the same.
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At this point we make some changes in the computer and took the car out on the road to see whats going on. We detrmine something is either wrong, or we are not setting things up correctly, and ditch the boost controller. Make a pull on the street to verify its good, and its holding around 14lbs. Perfect, lets go back up with the SLIGHTLY more agressive launch settings, but the reasonable boost and see what happens.
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Getting better, but clearly much slower than GLD from a week ago. It wheel hopped badly again and I pedaled twice. Also on this pass, I had waited in the staging lanes for 3.5 hours watching everyone on the property make multiple passes. Then when I do my burnout and get to the line they tell me my belt is coming off. I said are you going to let me run? He asked if it would over heat, and I told him not if you shut the fuck up and let me go LOL The tensioner slipped and let the belt come lose, but it did stay on so I fixed that up and got right back in the lanes. We had backed down the launch again, still spun/wheel hopped. The air was also worse at this point so I lost some MPH. I didnt take a pic of the slip, but it was 10.7 @ 131 or so.

After that I loaded up and headed home. I was there basically open to close, and was only able to get 4 runs in all day. Tomorrow I am going to try and work out whats going on with the boost control. I also am going to have to get back to Byron to get my passes done. I think I can come out from idle and just give it more boost up top and get it done, but I would probably need to be able to get more passes to be sure! Overall I am happy though, Car is running good, and is making good power. The trans is good, and I still learned some things. I guess stay tuned to see what other BS may go wrong on this thing :D
 

Broke EF

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Dec 8, 2017
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The saga continues! Today I fixed up the wiring on the dome pressure sensor. We did it kind of shitty last year in the thrash for drag week, and it was causing some issues. So this morning I did it nice, and then spent some time setting up a baseline for the boost control. I also changed the spring out to a 3lb for a base. I didnt mind going so low since I am using onboard compressed air, so no worries about running out.

Once that was done I got it all loaded up to head back to Byron and get my damn license!
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I dumped it off the trailer and made a hit. Car 39, right lane
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Not terrible off the trailer, with about 14lbs of boost. Basically same as it did with the same boost (or very close) at GLD a few weeks ago. I got the 60 foot better by putting some more air in them as suggested by a buddy of mine.

That was very promising, so I grabbed the laptop and turned it up some. I didnt go crazy with it, left the leave soft and then gave it more on the top end. That netted me this pass.
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FINALLY a fucking 9 out of this car! This was about 2lbs of boost at the hit, and peak around 15lbs. I still think it can go a 9 with 14lbs, but not until I can leave harder. This is the cars best 60' to date, and I dont really think I can do better without changes.

Anyway, I went back to the laptop and ramped in the boost a bit quicker, and I also added a little more at the end just to see how it was.
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As you can probably see it didnt like the faster ramp in. It spun/hopped so I had to pedal it, got back in it and it felt great so I stayed in it. At the very end of the run I saw 18lbs. BUT THEN, after I let out suddenly had a flood of water coming over the windshield. I noticed it was basically center of the windshield but wasnt sure why. The guys on the top end were kinda dicks about it. They were like "smells like antifreeze" Literally nothing in this cooling system or engine has ever seen antifreeze. They also had it cleaned up pretty quick. When I was back in the pit I heard the announcer saying if something happens pull over. I was like I know that wasnt directed at me! I was going 136 plus MPH and lost ALL of the water from my engine and didnt even wiggle. I slowed down and pulled off the track like any other pass.

So I wasn't entirely sure what it was. Like I said I noticed it seemed concentrated on the center of the windshield. I had my suspicions as to what that would be. I let it cool off for a bit and then brought it to the hose to fill it up. When it got to the water pump it just all dumped out. Yep, you read that right, I broke a stock OEM water pump for an LS! This was brand new OEM AC Delco from a dealer when I put the car together. It knocked the backing plate completely off, and its just stuck hanging out behind the pump for now. I ordered a new AC Delco that should be here tomorrow. I really want to go electric, but its just too much to do right now, and plus I need to be back at Byron Monday to get my license.

At least it finally ran a 9, if only just barely. It has plenty left in it as well, so thats nice. Here is a little photo dump including some pics the wife got. I will put up some short videos tomorrow.
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Oh, I was also messing around with my possible Sick Summer pack out setup. Not 100% sure I am going to use this rack yet, but wanted to see how things fit.
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Sticks out kind of far since this is for a 2" reciever, and SC has a 1-1/4" reciever. So I had to use an adapter.

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I was really hoping the roller base fit nice so it would make it a lot easier for taking it in and out of the hotels. but nah
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Not in the trunk either
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Thats all for now. Stay tuned for more disapointment.
 

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