perfect compression (how high is to high)

[TY_DOHC91]

the boost designs stage 3 kit comes with 9:1 pistons is that what one would want for a ka-t

i have not yet started my project yet just trying to figure out what i would need

thanks

[npaulseth]

9:1s will be fine. They will help spool up if you are going with a bigger turbo. You may be more prone to running race gas if you wanna up the boost a lot though.

the boost designs stage 3 kit comes with 9:1 pistons is that what one would want for a ka-t

i have not yet started my project yet just trying to figure out what i would need

thanks

[Structure240sx]

9:1 is a great compression ratio. thats what i am running. check my sig for some performance data. Ivan made 400rwhp on a stock ka with great tunning. so dropping the compression even slightly with forged pistons will give tons more protection against whatever you throw at it.

jsut remember you can have a completely built low *** compression motor and still blow it if it isnt tunned well

[30psi]

It depends on what your application is for. If it is street driven, then I would say anywhere from 9:1 to 9:5:1 properly tuned. I've had 9:8:1 on my mr2 setup with an autronix standalone.

[iwantawd]

It depends on what your application is for. If it is street driven, then I would say anywhere from 9:1 to 9:5:1 properly tuned. I've had 9:8:1 on my mr2 setup with an autronix standalone.

9.8:1 what was your setup? i dont think ive ever heard of a street driven car running that high unless it was an NA-T that didnt have a rebuilt longblock and ran 10psi max.

[30psi]

My first mr2 was a 95 turbo with a gen 3 motor in it. I ran it for awhile on stock internals and made 474 at the wheels with 23psi of boost with the greddy T-67 kit. After I sold that one, I bought another mr2(shell) and continued the process of rebuilding it. With this setup, I made 564 at the wheels with 20 psi. My setup is as follows:

greddy t78 kitRoss machine racing intake manifold4 primary 550cc injectors 4 secondary 720cc injectorsair to water intercoolerstock rodscustom cp pistons (9:8:1)act clutchjun flywheelhks 272 264 camsbuilt headetc.

I am in the process of rebuilding my 240 as we speak. with the following setup:

custom pistons (9:5:1)pauter rodsboost logic turbo kit or custom(not sure yet)fully built headcustom regrind camsboost logic intake manifoldetc.

My primary goal is to have a nice streetable 350-400hp street car, that would spool up nice and make lots of torque down low. Thats why I prefer a higher compression ratio.

[Boost_Veteran]

I'm not too sure why it seems like a lot of people in the nissan community seemed to be scared of compression. I know quite a few people running 10:1 or even higher aftermarket pistons and running boost levels of 15psi and over, some even on pump gas. There is nothing wrong with it and their **** isnt blowing up. Make sure you're getting plenty of fuel and not getting careless with your timing. I am by no means saying high is the way to go, cuz I beleive in making the turbo make your power not your piston compression . . . but 9.5 isnt crazy and 9:1 seems to work very well. I personally will never go past 8.5:1 if even that. . . but then again thats only a matter of oppinion.

[30psi]

I believe in order to run higher compression, you will need to run some kind of standalone though! None of these piggybacks.

[WDRacing]

The NA maps will kill you if you use anything higher then stock compression. Unless your using alky or water injection.

MY Celica GTS has 11.5/1 compression and I know several people running 10 psi on pump gas with a JWT type ecu.