a torque monster. Starting with a 220/220 on a 110 lsa cam (possibly a 108 lsa), I want to build a turbo'd LS6. I have a 1987 Turbo Buick and a 2001 Z06 vette. I want the best of both engines in a hybrid setup. So, what if I lower the compression to 8:1 in an LS6 for more boost (like the Buick V6 does). Port the heads, run 80#/hr injectors, beef up the bottom end heavily, and push 20-25 psi boost from a single turbo? The intercooler will need to be air/air for street driving, but will probably swap it out for a dry ice fed liquid/air intercooler at the track. Trying to make about 800 hp and 1000 torque or more. Should I build a 272cid Buick Stage II block'd V6 instead of doing this with an LS6? Probably going to go with propain injection if it is safe to run pump gas, or will just run 116 all the time.

The turbo is probably going to be in the 80 to 90 series to support that psi on that well flowing of a head. I know turbo cars, been playing with them since high school when my best friend had an '87 GN. So, what do you think? Am I crazy?

What is the power threshold on these LS6 blocks? What level of tq/hp is required before the stock crank begins flexing (600 hp)?

I'm selling my 17 sec truck. Since my 11 sec Buick and 12 sec Z06 aren't fast enough for me, this is going to be a street driven 10 sec car. Not sure what the car and chassis is going to be, but I have time to decide. Well, realistically, it will be driven 2-3 times a week for about 20 miles total, maybe


I'm considering locating and dropping the engine in a '62 vette, any "mid year" vette, first gen camaro, '70-ish Chevelle (ya know, the four headlighted ones), '66 leMans/GTO, '87 Regal, or C5 vette.

 

Probably going to need more injector than 80#/hr, huh?

 

You'll never keep the heads from lifting at 20-25 psi on an LS1.


Will

 

I was starting to shake just reading about it. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> I would use a 6.0l block with everything you said and it would be the perfect motor for the street.I have owend many turbo buicks and they are awsome street cars and i have always thought about doing something like this.The bad part about doing a stage 2 is everything is big money and hard to find.My friend had a stage 2 in his GN and it ran high 9 in street trim but then he built a twin turbo small block for it and now it is much more streetable and MUCH faster.It shut down a dynojet at 1200 hp on only 26#. <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> and it drives around on the street like a 12 second car(very quiet).If you are a buick guy you would love this car.Check it out on my webshots page at http://community.webshots.com/user/jleews6

On 22# it has run a 9.2 @ 152

John

 

You might know alot about GN's but it looks like you need to do some reading up on ls1's.
First off i think the most boost to date that was run in an ls1 was 16psi, this made over 700rwhp.
LS1s dont need as much boost as a smaller engine cause they flow, i cant imagine the power output when we take it up to 20psi. ANd 700rwhp is enough to run high nines on a full weight car. and for a ls1 a cam with a lsa of 110 would probably be to low. most turbo cams for us have an lsa of 114-116, although harlans cam is 112 i think. Id only lower your CR to 8.5:1. 8.0:1 would make it harder to drive on the street.

which car are you planing on doing this to the vette? or were you planning on swaping engines?

 

Don't give up!
Hawk, Ed @ LPE said the 8 sec Vette just put out around 1000 at the wheels <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" /> Granted it's a C5R block, but what's a couple grand more, when you're already this deep, right?! We need more trendetters. LS1Speed said theirs has already put down over 800 rwhp. I would contact them as well, cuz your're definitely going to need a FAST system with that! 1000 won't be too uncommon with the big dogs before long! Supra what?!?! <img border="0" alt="[jester]" title="" src="graemlins/gr_jest.gif" />
BTW, I would do it to a 1st Gen F-Body, with the whole "Pro-Touring" thing going on!

 

Something to think about.My friends gn made 770 rw with 14# and mobil 93 octain. Then with 22# it made 1080rw on c16.With 26# it shut down the dyno

His 274 ci v6 made 800 rw on 28# of boost.I think his stage 2 heads lowed like 330 but only 6 ports.

30th ta did you see the post when someone said that nos ls1's will be faster than turbo ls1's? Hawk, Ed @ LPE said the 8 sec Vette just put out around 1000 at the wheels <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

 

The head lifting problem is a joke. Detonation + head bolts = heads lifting.

 

True, my research knowledge is limited, because I didn't know about this site until recently. This site kicks ***! Before, I thought everyone with an LS1 was arguing about floor mat letter colors in their C5, as the other boards do <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

I have read here before where LS1 heads can lift, before the bottom end goes. So, I'll lower the boost to a sane level. Boost is actually bad in higher numbers because it means you can't push the air through the engine fast enough So, given super high flowing heads and 15 psi boost, the heads will stay on a LS1 block? There are Turbo Buicks running 10's on incredibly low boost because the engine is setup to flow the air incredibly well. I am going to lower the CR so that I can boost it up without knock and run pump gas in street trim, if it had to for a road trip.

Thanks for the input guys!