In my case my tranny is limited in the amount of torque it will take, so I would rather rev the engine higher and make more HP with a bigger turbo. Does anyone know what upgraded valvetrain would be limited to? With the setup I mentioned 9300 RPM would be possible with for the bottom end without stressing it too bad.

 

As long as you have enough valve spring pressure you should be able to rev the engine that far. As for torque, well you can manage some of that with the A/R.

Jose

 

Right, that is why I said I was going with a bigger turbo. I will also use a big cam to kill some torque. I am starting to lean towards a LS7. I am very interested to see what a big cam will do to the torque in one.

 

like others mentioned, Kurt built his 352 cubed engine (for ls1 series class rules at the time)
with a 6.0 block and shorter crank, and spun that **** to 9000rpm.

 

Matt never mentioned that to me. At the rate that we're waiting on his parts to come in, we might as well destroke it now. The turbo did show up yesterday! Now we're waiting on his F.A.S.T. system. Bob

 

I agree. I hear a lot of comments on this board about racer "X" ran 180 mph and he only uses 3xx ci... ever wonder why he uses 3xx ci??? Because of class rules!!! If given a choice, most would certainly go with more cubes!



BTW, turning 8000 rpm would require a dry sump system as well.

 

well have any of you seen or heard of brammo/spectrum 5 racing?

they built an ultima GTR for street racing. they used a LS6 that i think was bored out and short stroked! they said the top end could take 10Krpm!!!! but this was in a 2200lbs car with a tranaxle that could only take about 650lbsft os they went high rpm, high boost, high cost! but the thing still made 1300bhp at about 9psi or something! insane!

here is brammo's site http://www.brammo.com/content.php?content.4

and here is some more info (and pics) on the spectrum site. click on cars and then the GTR project! http://www.spectrum5racing.com

thanks Chris.

 

I think the stock pcm stops making corrections at like 7500, and it just keeps the same value at 7500 onwards. Not 100% sure.

For 9300 rpms you would need a solid roller and an intake manifold that flows up there. The only LS1 I know of that has gone 9300 is Judson's NA motor.

 

BS3 would solve the PCM problem right.

 

Absolutely.

 

I see the package, but I think you are mixed up on the power and all that. They build a Gen1 SBC twin turbo with splayed valve heads and Kinsler EFI that turns 10k-rpm and get 1300hp at 14psi (its in the yellow Ultima). I didn't see any specs on a build LS1 motor. I still think SAM has spun the LS1 higher than anyone else (on purpose).