🔧 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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Another weekend has come and gone, and I have another terrible update. The short version is, nothing got done.

The slightly longer version is I actually tried to work on it. Sunday I cleared everything out from under the car, got it lowered down. Then I cleaned up my bench, wiped it down with acetone. Got the welder all set up, got the first part all prepped. I was back purging for the first time, or trying to. So once I had the hose setup and the part closed up I opened the valve. It sounded like it was leaking, and there was no indication from the flow meter that it was doing anything. It did sound like gas was making it to the part though. So I check the welder side, and that flow meter is reading, and I can adjust it. However I only got an initial puff of gas when I first hit the pedal, but I didn't hear it flowing. I still tried to weld and see what it was doing, which was not working.

I fucked with it for a while before making up a soap solution to find the leak I must have. I sprayed everything, remade the soap solution, sprayed everything again and couldn't find ANYTHING. If I cracked a fitting open it would bubble like crazy, so I know the soap solution was good. Well I assume it was good enough. I went through and re-cinched everything up. No matter what I did, it wasn't working. At one point it seemed like it was good, I think the back purge side flow meter started reading, but it had no gas to the torch.

This is a brand new regulator, and it was too nice out to be pissed off in the garage all day. I took the ATV out and got it stuck in some mud to distract me.

I contemplated putting the old regulator on and just going for it, or maybe just welding the aluminum. I really would like to properly back purge all the stainless though, and want to get some hood time before I get on the aluminum. My neighbor even brought me a regulator off his welder before he knew what I was doing. I then thought about pulling the motor out to work on everything else. But I really need get everything welded before I can do that. Makes no sense to pull it apart now to put it back how it is right now.

I am not really sure what to do. I would love to fix this regulator, if only I had any idea where it was fucked up. Apart from dunking it in water or something, I don't know how I can prove that it is the problem. I have also thought about letting it sit and buying some tools (like a new welder). That is honestly just a diversion tactic though since I have everything I need to finish most of it. Thought about ignoring it and start working on other things like plumbing and wiring, shifter, driveshaft, etc.

All in all I am super frustrated. I have been putting off this final welding because I am pretty sure its going to be a shit show, and so far it is and I still haven't even welded anything.
 
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Broke EF

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This whole deal was really bugging me yesterday. I was trying to think of what to do next pretty much all day. Do I move on to some other part of the car? Do I just not back purge? Should I just order a new regulator? Eventually I asked a co-worker what he thought, and he was equally as confused about what it was doing as I was. I then looked up the manufacturer and sent them an email asking WTF was going on with it. Basically I wanted to know where to even start with trouble shooting since the problem didn't even make sense to me.

When I got home I cooked some dinner, we ate, then went for a ride. When we got back I decided to give it another look. Started by taking the tubing for the welder off and see if I had flow there. I did. Then I checked the other side, also had flow over there. Then I opened them at the same time thinking one side was taking up the flow, nope both worked fine together. Hooked the welder back up, tried it by itself and it worked fine. Both together, you guessed it A-OK. So yes, it just worked like it should last night without me actually doing anything differently.

I guess that means I can try this all over again this weekend. So fucking annoying, but at least its "fixed" now.


Sean
 

Broke EF

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Dec 8, 2017
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Well, its Monday again. More attempts were made, more frustration, but maybe a solution?! So I thought I had this issue "fixed" as I said. I was getting pressure/flow out of both sides. So I get everything all set up yesterday. Move the cars, unwind the leads, clean up the bench and the part again. I set it up to back purge and start it running. Check to make sure the torch is getting flow, and it is. I hit the first small weld and its shit.

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Better than it was last week, but still trash. I tried a couple different things, but it was not working out. Then I tried closing off the back purge.

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Still a terrible weld, but at least its not grey and contaminated. My ability aside, that looks like everything is working as it should. So then I swapped the hoses side to side. The back purging seemed to work better, but when I went to weld it was junk. No changes made it any better either. So then I decided to finally take apart the right side of the regulator, which I had been using as the purge side until I swapped them. Turns out the ball wasn't stuck at the bottom, it didn't exist! That would explain my issues since that flow meter is vented at the top. I think what is happening is it is pulling air down into it contaminating the gas. That explains why it worked like normal when I closed off the back purge completely. I reached out to the company, we will see what they say. My neighbor has a similar regulator so I may take the ball out of his to verify that is my issue 100%.

Such a small, stupid problem that I could have seen much sooner if I wasn't such a noob. Now knowing what the inside looks like I should always be able to see the ball, and I feel dumb not realizing that. Oh well, live and learn. I am glad I didn't give up on back purging and hopefully figured out my issue.

I also got some parts over the weekend, and will probably be ordering some more this week. I am trying to get it running and driving for Drag Week still since that hasn't been canceled.
 

Broke EF

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Dec 8, 2017
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One step closer! That was the last big ticket item. I still need a decent amount of stuff, but its more a collection of less expensive things now. I did verify that the new regulator works, but didn't get much welding done. I need to really get after that this weekend. Wish I would have put AC in the garage!!
 

Broke EF

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Dec 8, 2017
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Guys, you are never going to believe it! I actually got some work done on the car this weekend!! Don't get too excited, it was just some welding, but that is better than I have done in a long while. Now, before I post some pics let me say I have not welded in a LONG time. I was never that good to begin with. I was still having some issues with gas coverage (I had a breeze blow away my coverage a few times before I figured out what was happening). Because I have no idea what I am doing I was playing with settings a bit. I could go on and on, but suffice to say I am no IG welder. I am lucky if it sticks together.

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I started getting it figured out toward the end.
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I got that piece pretty much fully welded. I think I have a couple small areas that I didn't finish. Back purging helped, but I don't think I did a good enough job since I do still have some sugaring on the inside. It also goes through gas VERY quickly. I probably could have been using less through the torch, but I had it up a little high because I thought it wasn't enough. That ended up being that gentle breeze I mentioned though, but I put that together when I was about done. I have a better plug solution for the bigger tubing which should also help with back purging. A lot of what I have left to do should be a lot more simple than this part was, which means it should go quicker?

This week I am going to pick up a large tank of gas so I can really get after it. This part looks like shit to me, but I already want a bigger turbo and that means this piece will get remade anyway :) I am glad to have my welding problems figured out though. Well the equipment problems anyway, skills are a different problem.

Welp thats all for now. I should have more updates this weekend!
 

Broke EF

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Dec 8, 2017
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Your welds are way better than my bird shit so I have nothing to say. You must be a perfectionist.

Just keep chipping away a bit here and there is better than nothing.
I am a bit of a perfectionist, but also not good at stuff :p I took pics of the nice looking welds, the whole thing is not nearly that nice. As a whole its pretty meh looking. I had a bunch of spots from when I was having issues with the back purging. I have spots where the gas was blown away mid weld. Settings were wrong, tungsten was dirty, and so on and so on. My good looking weld to shit weld ratio was getting better as I went though. I am hoping some of the more visible, and less likely to be changed/modified parts will weld up pretty nicely. I have actual plugs for everything else (I think) and the fit up on most of it is better. I am still worried its all going to warp like a motherfucker, but only one way to find out.
 

Broke EF

TCG Elite Member
Dec 8, 2017
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I was really hoping to buckle down and get after it this weekend. Unfortunately for me, I also agreed to do a bunch of shit like help my 9 year old niece build a computer. So Saturday morning, bright and early I went and got more gas for the welder. I had my buddies tank filled, and also got myself a 300 ci tank as well.

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Hopefully that means I will be able to really get after it and get things finished up without running out of gas. I am going to try to only use the big tank, so I can give my buddy back his welder with a full tank, but if I need to I will use it :)

I dont THINK I have anything going on this upcoming weekend. So of course that means I want to just sit down and weld non-stop. Fingers crossed that can happen. I do still really want to get the car out this year, and the clock is ticking!!
 

Broke EF

TCG Elite Member
Dec 8, 2017
1,782
4,545
The sticks

This seems so enthusiastic :LOL:

Keep up the good work and please keep posting the pics - you are encouraging me breaking out my little tig and trying to learn myself.

Thanks! Trust me, if I can do it, anyone can. Get out there and start welding! There is no replacement for hood time, so start running beads! I taught myself how to MIG and TIG just to build turbo kits for my buddies car. Sure beats paying a shop a fuck ton.
 

Broke EF

TCG Elite Member
Dec 8, 2017
1,782
4,545
The sticks
Gentlemen (and ladies?) work has been done to the car!! Believe me, I am just as shocked as you are, but here we go.

Saturday I started by setting up the welder. I tried to put the new big boy tank on the cart.

20200801_114712-X3.jpg


It didn't work :LOL: The chain was barely able to reach, it banged up the lip on the back of the cart, and the regulator wouldn't reach without changing the hose. So I put the old tank back on with its original regulator to run the welder, and then set up the big tank next to it just for back purging.

20200801_122748-X3.jpg


Then I got the next part all set up to back purge.
20200801_130203-X4.jpg


I ended up changing out the foil, but I think it was working fine actually. Anyway, my welding is still terrible. I will blame some of it on having to readjust the regulators, but really I am just not that good :)

Here is a pic from part way though. I was trying to move around a lot to hopefully not warp the fuck out of everything.
20200801_135645-X4.jpg


Here are some closeups
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I got that part almost 100% welded. I have just a couple small areas to finish up. I wanted to knock it out on Sunday, and also at least start on the last hot side part, but ended up being busy all day. In general it went better this time, the inside looks a lot better for sure. I think I got the purge flow figured out finally, I think I need to mess with the torch flow a bit more. The flow on the torch kept changing which was annoying. I also forgot about the doors being open, so I had a few times when a breeze blew off the shielding gas. The next piece I have to do is the one from the driver manifold over, so its very easy compared to the two parts I have already done. Then comes the downpipe. I need to fab up one last bend on that, and then I can weld that all up, which will take FOREVER. Anyone who has welded 4" knows, it just never ends. I actually probably need to grab more filler rod before I start on that one. I may also wait to do it until the motor is in 100%. That means I can finish the last part of the hot side, test it all, then blow everything apart again.

Well that is all for now. It doesn't look like much, but that was hours of work to get that piece welded up. Some of this stuff goes a lot slower than you would expect. See ya next week for some bigger updates?
 

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