Twin turbo, LS1, T56, Blow through Grand National
 

Heres a little project me a buddy were working on after hours for the shop owner. Its a 87 Buick Grand National. The engine/trans transplant is finished, just need to fab up the clutch pedal, and run all of the lines, also need to build the trans tunnel, since the t56 was much to large to fit in the stock tunnel. We build this from scratch, no kits here. The kit is utilizing stock grand national turbos for now, with external wastegates. Sorry for the cell phone pics.

Attachment 18049

Attachment 18050

Attachment 18051


Attachment 18052

Attachment 18053


Attachment 18054

Attachment 18055

The downpipes need finished welding. wastegates need welded on, The motor needs pulled one last time, to fix the oil pressure problem, and put in the felpros, and ARP studs.

Attachment 18056

Attachment 18057

Attachment 18058

Attachment 18059

Attachment 18060

Re: Twin turbo, LS1, T56, Blow through Grand National
 

THAT IS AWESOME! ;D

Re: Twin turbo, LS1, T56, Blow through Grand National
 

awsom how much hp can you extract from those stock turbos in twin set up..
and what kind of tranny is taht a TRuck one lol
sorry im not too much into big american stuff but i think its cool

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Thats ok, american stuff pretty much sucks anyways, hehe. I wish we had all the Aussie and European stuff over here.

The transmission is a tremec T56. Its from a Chevy Camaro, Its a 6 speed tranmission. the Engine is a LS1 also from a camaro.

Those two turbos together should barely support about 700hp max. But they are being upgraded.

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Thats awesome. I love those cars......

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Looks like it's coming together. Hopefully you don't run into any air distribution problems with that low profile hat. You trying to fit it all under the stock hood?

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Awesome very nice

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Should haul some serious ass, looks great.

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Awesome project! I love the gbodies >:D

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Where did you get those flanges for the turbine inlet?????? I need to get one for mine. 700 hp for both, is that at the wheels? I have only one and figured that is about right (350 for one) props for doing something different.

Re: Twin turbo, LS1, T56, Blow through Grand National
 

awsom 8) its the new american stufff that garbage :S and the mid years transiston to smog equipment and fi O0 O0 O0

Re: Twin turbo, LS1, T56, Blow through Grand National
 

weren't the stock GN turbos T3/T4's of some kind? or were they straight T3s?

Re: Twin turbo, LS1, T56, Blow through Grand National
 

I dont think they are either. They use a 3-bolt triangle flange, and a standard T3/t4 oil drain does not fit either. Its a garrett turbo though.

Re: Twin turbo, LS1, T56, Blow through Grand National
 

I dont know where he ordered them from, but I can find out for you.

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Cool, I guess I will need a drain flange too. Do you know where I can get one of those? Those turbos seem to be common on ebay.

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Was that GN in bad shape to begin with or something?? That car is worth alot of bread in original condition, I can't see hacking it up like that. Any dime a dozen f-body would have been sufficient...

Re: Twin turbo, LS1, T56, Blow through Grand National
 

Only thing "hacked" on the entire car was the Trans tunnel to fit the 6 speed. And yeah, the car was in bad shape to begin with. Had a blown motor and transmission, about 6 inches of water in the carpet, flat tires all around, all missing trim pieces, some dumb ---- probably owned it before.

The whole reason it wasnt done to a F-body is because "They are a dime a dozen" And it probably wouldn't be as impressive I guess. Plus it ddint really matter to the owner of the value of the car. He has another GN in perfect condition with computer, turbo, and exhaust upgrades, and he is rich as ----.