99 SI project.

[Formally...]

I would do a little higher compression then 9:1. More like 10:1 or so. Also, go with JE pistons over CP.

[SPOOLIN]

Also, go with JE pistons over CP.

I concur.

[-S Double C-]

I would do a little higher compression then 9:1. More like 10:1 or so. Also, go with JE pistons over CP.

id go with arias over the je's

[SPOOLIN]

id go with arias over the je's

lol i concur again.

[froyotlbw88]

I would do a little higher compression then 9:1. More like 10:1 or so. Also, go with JE pistons over CP.

I don't understand...if he's trying to boost he should go with a lower compression...the lower the better

[Formally...]

I don't understand...if he's trying to boost he should go with a lower compression...the lower the better

Not always. Higher compression with lower boost will make the same power and be more responsive.

[froyotlbw88]

Not always. Higher compression with lower boost will make the same power and be more responsive.

That's in the event that he doesn't want to run high psi levels. But when he wants to run his Garrett turbo to 16 psi or higher, he's not gonna want higher compression pistons.

[josh green]

^^This guy knows whats up!

[Formally...]

^^This guy knows whats up!

Thanks Josh. O by the way doesn't your GSR make like 400whp on 11psi of boost. Is that because it is 10:1 compression? Didn't you make like 460whp on 15psi and pump gas no problem? Most of the time a 9:1 motor takes about 18-20psi to make same power. That means more lag time. Also means when you are not in boost (85% time your driving) you have a pretty responsive motor.

So yes if you want to run crazy high boost then that is a different story, BUT if you read the first post he said 300whp. But then again Miller's 8sec honda is over 12:1 and 50psi.

[josh green]

double post

[josh green]

Thanks Josh. O by the way doesn't your GSR make like 400whp on 11psi of boost. Is that because it is 10:1 compression? Didn't you make like 460whp on 15psi and pump gas no problem? Most of the time a 9:1 motor takes about 18-20psi to make same power. That means more lag time. Also means when you are not in boost (85% time your driving) you have a pretty responsive motor.

So yes if you want to run crazy high boost then that is a different story, BUT if you read the first post he said 300whp. But then again Miller's 8sec honda is over 12:1 and 50psi.

I dont even know what a turbo is, dont it go on the fan belt? You know these people knowz eeeerrrrthing!

[SPOOLIN]

Thanks Josh. O by the way doesn't your GSR make like 400whp on 11psi of boost. Is that because it is 10:1 compression? Didn't you make like 460whp on 15psi and pump gas no problem? Most of the time a 9:1 motor takes about 18-20psi to make same power. That means more lag time. Also means when you are not in boost (85% time your driving) you have a pretty responsive motor.

So yes if you want to run crazy high boost then that is a different story, BUT if you read the first post he said 300whp. But then again Miller's 8sec honda is over 12:1 and 50psi.

Its in his Head more than the compression. Just FYI.

Lots of headwork

[TheChosenOne]

That's in the event that he doesn't want to run high psi levels. But when he wants to run his Garrett turbo to 16 psi or higher, he's not gonna want higher compression pistons.

It's really up to the tuner, and what he wants out of the car. I could have sworn he said he just wanted 300 whp in the OP. 10:1 should be just fine for that without any detonation issues. ITR's and GSR's run higher compressions with that, and 16 psi is a cakewalk. The slightly higher compression will give him a much better throttle response out of boost, and make him more power at lower psi.

[Formally...]

It's really up to the tuner, and what he wants out of the car. I could have sworn he said he just wanted 300 whp in the OP. 10:1 should be just fine for that without any detonation issues. ITR's and GSR's run higher compressions with that, and 16 psi is a cakewalk. The slightly higher compression will give him a much better throttle response out of boost, and make him more power at lower psi.

Thank you. I just like the little higher comp. For example Ben's (ATLTSX) GSR hatch made 286whp at 6psi on basic T3/T4 with stock head. That is over 20whp per lb of boost over stock motor. Most turbo setups are 10-14whp per lb.

And Matt, I know I know.