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02 Xtreme LQ9 twin turbo w/ pics

14K views 44 replies 17 participants last post by  no green  
#1 ·
I finally got some work done on the truck. The cage is a Jegester kit that I bent to get the bars where I wanted them. When I bought the truck from my son it came with a 8.5" rear from s blazer. I narrowed it welded the tubes to the center and installed the ford ends. Moser limits the "stick out" of their axles so the backing plates needed to be clearenced and attached to the back side of the housing ends. It has a 3.70 gear and a spool and 33 spline axles. Also I mounted with with Smith Racecraft bars. I bought a 02 LQ9 from a Caddy and used Trans Dapt mounts. I set it as low and as far bak as possible. The trans is a 1000hp 4L80E with a brake from Extreme Automatics. I got lucky and the drive shaft from the GN was the right length. I made some turbo headers from stainless but weld fittings. The turbos are Limit Engineering LT70 with a Qtrim exhaust wheel. The down pipes are 3" stainless and had to be run under the K member. The driver side crosses over to the passenger side and merge into a single stainless 4" pipe with a Magnaflow muffler. I'm still waiting for some 4" 90's to finish the tail pipe. It will exit in the stock location. I still have to finish the waste gate plumbing ,they will tie into the down pipes and build the cold side of the turbos. For now there will be no innercooler. I plan on running it on E85. We'll see how much boost I can run without one. The engine will get a 4" crank cnc ported L92 heads. With the Holley intake the stock hood is about an inch from closing time for a cowl hood. Once the turbo plumbing is done the engine will get pulled and built. I still have to build the fuel system cooling system and do the eletronics. I plan on using a stock ECM.
 

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#28 ·
Do you have any ground clearence with the downpipes? looks awfull close.
 
#18 ·
I added a 1 5/8" tube cross member in front of the stock one for support and to mount the rack. It ties into the front of the stock one. As to the angle of the tie rod ends it was sitting high 'caus there was no motor in it when the pics were taken. If you noticed there is bump steer adjusters on the spindles and the rack can be shimed to adjust for bump steer. Once I'm done with the turbo fab work I'll pull the motor finish striping the front end and install tublar control arms. Without the springs installed I'll cycle the suspenion and check/adjust bump steer.
 
#21 ·
Looking very nice but which rack is that? I'm really contemplating R&P but was wondering how much bump steer will occur on a non-center steer rack like that, bump steer correctors can only do so much. Also would it even be worth it compaired to a good fast ratio 12:1 box style setup and new components?
 
#22 ·
The main reason for the manual rack was to freeup some room for the turbos. No power steering pump or hoses and the alternator is where the steering box used to be. I set the motor low in the frame for the same reason.Weight wasn't a concern although it saved some. The rack is from Applied Racing Technology. It's a narrowed pinto unit. The same one that TRZ uses in their kit for the s10. Funny thing is that it came with a tag on it that said Flaming River.
As far as bump steer goes most double a-arm suspenions have some. Have you seen how the front tires shimmy on a stock front GM A-G body suspenion after landing from a wheel stand? The object is to minumize it. By moving the rack or tie rod up or down you can change the bump steer curve. You can also limit the suspenion travel to keep the toe change from causing bump steer.
 
#24 ·
Looking good~ How low is your downpipe going under the K member..

All fab work looks good... EXCEPT that collector into the throttle body... what the heck is up with that?! Glob lots of weld to fill holes, and try to grind smooth? lol... Can you get some better pics of that? Maybe it was just the flash.

How come you didn't just buy some 4.5" tubing into the TB, and cut the radius' down the center to merge them?
 
#26 ·
Should be a pretty quick truck. I wanna see numbers
 
#29 ·
what u trying to do anyways?

u can probably kill urself with one turbo all right...
and can enough speed out of it too...

like bandit's s10...
 
#30 ·
My goal is to be able to make a 8.99 1/4 mile pass and be able to cruse to and from the track. I won't be making a bunch of passes in that range nor will it be a daily driver. I had a low 9 sec Grand national race car that I raced in a heads up class. It was always set on kill required alot of maintance and wasn't comfortable on the street.My truck will keep all of the comforts of a stock Xtreme except for power steering. The trans is still a full automatic and the brake can be used with the shifter in the drive position. I built the cage so the door bars can be removed and the roof bars are tucked up out of the way. I will keep the cruse controll, air conditioning, antilock brakes and even the air bags. I know the truck will be heavy and my goals are high but the turbos will make enough power to reach my goal if I can keep it together.