With only 4 psi the smaller pipe is definately a better idea. Although for 4 psi why would you even bother, run ten, it,ll live.

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Edited May 24, 200818 yr by Sbox

Yep, the smaller pipe is good enough for any k series turbo setup.It is k series isnt it?. weather the motor would stay together on 10 depends on how perfect your tune is, it needs to be perfect. if it is non efi, don't do it. People normally only put cams in a turbo motor to get the best out of a turbo, eg. to get the least laggy setup with the most power. It is only a small power upgrade in most circumstances. If your setup is fullhouse like madrolla then hell yes you will do the cam.

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Edited May 24, 200818 yr by Sbox

Thanks for the help, it's a 4age big port EFI and the turbo is that 20DET off the Sylvia does that help at all? I want it to go but I also want to be able to drive it. Might go the mild cam grind for a bit less lag, still buggered on what to do in regards for the intercooler. Big or small, big or small?

 

The turbo i have is a GARRETT CT2574 off of a SR20, The turbo number is:

 

CH 0112J

14411-RR520

479022-1B

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Edited May 24, 200818 yr by Sbox

psi amount doesnt really matter, its how much air the turbo can move not the pressure, you can have a small turbo making 15psi or a bigger turbo making 7psi and the engine will be making the same power. I used 2.25 inch piping in and out for my supercharger setup and huge FMI on 2t-geu seemed to work well.

psi amount doesnt really matter, its how much air the turbo can move not the pressure, you can have a small turbo making 15psi or a bigger turbo making 7psi and the engine will be making the same power. I used 2.25 inch piping in and out for my supercharger setup and huge FMI on 2t-geu seemed to work well.

This is true, but to make the same power with half the boost, the turbo would be spooling up at about twice a properly sized turbo.

 

The turbo i have is a GARRETT CT2574 off of a SR20, The turbo number is:

 

CH 0112J

14411-RR520

479022-1B

 

Good choice if you want it to have max driveability like you said. I would go the 2.5 inch pipe, it would suit your situation and would minimally reduce lag. 3" is not necessary.

This is true, but to make the same power with half the boost, the turbo would be spooling up at about twice a properly sized turbo.

Good choice if you want it to have max driveability like you said. I would go the 2.5 inch pipe, it would suit your situation and would minimally reduce lag. 3" is not necessary.

 

Too late, Already got the FMIC :P

 

The I/C was the calculated size for the application (Not done by me) so i will see how it goes, If its laggy i will keep the 3" I/C but run smaller piping.

The lag difference would be very little. The reason i would have gone 2.5 is just cause of the the extra cutting and clutter you get in the bay for the bigger pipe, but its a 4a so youre not exactly short of room anyway. so good choice and good luck!