What does it take for 800 hp

[pwwatkins]

I know it will take a lot of supporting mods, but I want to get 7-800 hp.
Will this be streetable? I would want to achieve this with a turbo and NO nitrous. Would a ls2 with a T76 be capable of this running on E85? Right now I have a single turbo rotary with 400rwhp and could get to 550 pretty easily (ie. I already have all the mods for it but need porting), but anything beyond that and I would always worry about blowing my motor...Would I be better off buying the 'lsx bowtie block' and building an engine?

[pwwatkins]

Maybe you guys here a lot of these kind of questions and chalk it up to someone dreaming, but this is not the case. I am either going to build up my rotary a little more, or go lsx. I've put 12,000 into my current enging in the last 2 years.
Here is a link to my car in case anyone is curious.. http://www.rx7club.com/showthread.php?t=676332
any info would be appreciated

[cailey37]

Well, lets see. Yes, 800hp is possible. It just depends on how much you want to spend to make sure it lasts. Maybe I should post a cost sheet to help. Are you putting this in the RX? Because once you do the motor your attention will have to move down the drivetrain since it will become the "weak link" with the power you want. Precision turbo has a 76mm turbo rated at 1100hp that should do the trick. Things you want to look at are Forged shortblock, good flowing heads, cam, methanol kit and intercooler. As far as the E85 goes, some people say that the octane rating for that is like 110. I'm not sure. The only real thing you can do is once you put it all together and you start your tune is just monitor it and see how it goes. I run premium in mine along with methanol and it's fine. Hope this helps a little....

[pwwatkins]

Well, I know it is going to cost a lot. Hinsonsupercars.com does a turnkey conversion for 8200, I would just have to supply the motor. I may stay na for a little while, which is pretty much until I get bored..I just hate having to do things twice (like injectors, then bigger injectors). I am planning on spending 8-9000 on an engine transmission (T56)combo, then I would just have to upgrade the rear end and axles. Then a little later, hinsonsupercars sells a custom turbo kit for lsx rx7's. If I would need meth injection then I may as well stay with the rotary since I already have an aquamist meth kit in my room, which would put me over 500 to the wheels with my current setup.
ps. My brother has a supra that with race gas is 700hp, and I would really like to give him a beating.

[Frost]

I have the precision 76 (P76GTS) that cailey37 was talking about, and you can make over 700 to the tire with a stock-inch LS1 and that turbo on pump gas, and closer to 800 with premium heads. That turbo will likely have some backpressure issues on an LS2 in a front-mount application over 6300-6400 depending on the rest of the kit. It is suited well to a 347" mill. I made something like 594rwhp at 10psi, and I run 16-17psi on the street. I was picking up 25-30rwhp per psi up to 10psi on the rollers. I had some trouble getting the car spooled on the small rollers of the unloaded dynojet 224 that I was on, so I quit at 10psi.

[tonyjnjz]

badass looking car...are those hre wheels? lingenfelter.com they do a twin turbo very reliable ls1 thats capable of 1000 rwhp

[pwwatkins]

They are aza wheels, but I'm about to get some ten spoke black 11.5 inch ccw's with bfg drag radials and some wider fenders. That should help put some power down, or at least break something!

[pwwatkins]

I have the precision 76 (P76GTS) that cailey37 was talking about, and you can make over 700 to the tire with a stock-inch LS1 and that turbo on pump gas, and closer to 800 with premium heads. That turbo will likely have some backpressure issues on an LS2 in a front-mount application over 6300-6400 depending on the rest of the kit. It is suited well to a 347" mill. I made something like 594rwhp at 10psi, and I run 16-17psi on the street. I was picking up 25-30rwhp per psi up to 10psi on the rollers. I had some trouble getting the car spooled on the small rollers of the unloaded dynojet 224 that I was on, so I quit at 10psi.

So it's not that beneficial to use an ls2 over an ls1?? I really like the sound of your setup! On my car I can run 17-18 psi pretty safely on 93 pump. Is it the same for lsx engines? If I could have 600 at 10psi and 700 at 15psi, then I would be very happy. Do you have to have a pretty built up(internals) engine to accomplish this? Thanks for the info!

[Frost]

Yeah I have an HKE built shortblock. Don't get me wrong, the LS2 is a bit stronger in stock form than the LS1, but you will be going built... A built LS2 and a t4 PTE88 is a winning combo too. If you spent the $$$ and went with sonething like a forged LS2 or LS2 stroker and a t6 setup and ETP or AFR heads, you could likely make as much as 800rwhp on pump gas and methanol.

[5.7NSIDE]

800hp=A$$ load of money!

[BlackNight]

So it's not that beneficial to use an ls2 over an ls1?? I really like the sound of your setup! On my car I can run 17-18 psi pretty safely on 93 pump. Is it the same for lsx engines? If I could have 600 at 10psi and 700 at 15psi, then I would be very happy. Do you have to have a pretty built up(internals) engine to accomplish this? Thanks for the info!

I run a 347 stock cube LS6 lunati forged crank,
compstar floating pin rods diamond forged pistons 9.3 to 1 compression
241 ported heads with the 205 intake valves.
vortech YSI V7 pushing 18 psi
comp cam 551-551 224-228 on a 115 lsa very streetable with good vacuum for excellent braking.
I,m putting down 775 RWHP 724 torque on 85 octane with conservative timing of 10 degrees at WOT
On the bottle with race fuel and a 150 wet shot 1010 RWHP on my little ole LS6

[cailey37]

I run a 347 stock cube LS6 lunati forged crank,
compstar floating pin rods diamond forged pistons 9.3 to 1 compression
241 ported heads with the 205 intake valves.
vortech YSI V7 pushing 18 psi
comp cam 551-551 224-228 on a 115 lsa very streetable with good vacuum for excellent braking.
I,m putting down 775 RWHP 724 torque on 85 octane with conservative timing of 10 degrees at WOT
On the bottle with race fuel and a 150 wet shot 1010 RWHP on my little ole LS6

85 octane???? 18psi and your compression at 9.3, how the heck do you keep it from detonating

[BLACKNIGHT03Z06]

85 octane???? 18psi and your compression at 9.3, how the heck do you keep it from detonating

I hope he meant 85E which someone on this thread quated as being around 110 octane. I know on the Z06 Forum MIKESZ06 was running a C5R block, all forged internals, 8.5 to 1 compression, a Procharger F1 @ 17psi of boost and he had challenges running that much boost and has gone with a different set up on an LSX block and reduced boost.

[BlackNight]

85 octane???? 18psi and your compression at 9.3, how the heck do you keep it from detonating

10 degrees of timing is very conservative
Didnt show knock retard on the dyno.

I guess I,m just lucky, the aftercooler air to water normally keeps my air intake temps below 105 degrees even at WOT

[Frost]

use meth for god's sake!!

[vaticano]

I don't have a turbo but get about 30 rwhp per # of boost with my D1. At 10#'s I dynoed 720 SAE rwhp running E85, on the stock internals Ls1. I finally got the belt to stop slipping and picked up 2.5 more #'s. I just need to get back to the dyno before I brake the motor.

[66MONEY-PIT]

Question, so how much can a stock ls2 block hold safely?

Thanks,

Gunnar

[itsfess]

I would consider going to an ls motor over the rotary purely based on reliability which turbo rotarys aren't exactly known for.

[Frost]

Question, so how much can a stock ls2 block hold safely?

Thanks,

Gunnar

My opinion on this, and much of it is up to how good your tuner is, but about 650rwhp turbo, and 600-625rwhp SC'd

[66MONEY-PIT]

I was told that the block and crank could hold up to 1000hp but the rods and pistons could only go like 550. I've seen cars putting down 600-700 with stock internals.

Thanks,

Gunnar