I did alot of searching and Ive found that this matter is a toss up. So I will give you guys my setup and you tell me what you think. Im wondering if my 2.5" IC piping is too big.

Precision SC61 turbo .63 A/R 76 trim
Tial 38mm
HKS SSQ
SFMU
Stock Injectors for now
2.5" DP straight to back
Crane 0014 turbo cams
10.5:1 JE's

Is there anything I need to add? Im running boost off of the WG, so its only about 6 psi. Do you guys think I should get smaller diameter piping? Once Mr.Slick and I install the MS, I will be puttin bigger injectors in and upping the boost.

MMmmmm.... Hi Comp pistons and boost.

:thumbsup

Originally posted by Blizare
MMmmmm.... Hi Comp pistons and boost. :thumbsup

Whats that mean???

Nevermind, :thumbsup isnt on your post, lol

Most people run a low compression piston with their turbo setups. There is a greater chance of detonation with high compression pistons. High compression pistons are more commonly used in nitrous and all motor set ups.

I think your piping is fine for that size turbo once you run higher boost. Why not upgrade to a full 3" Exhaust?

Originally posted by jltalon
Most people run a low compression piston with their turbo setups. There is a greater chance of detonation with high compression pistons. High compression pistons are more commonly used in nitrous and all motor set ups.

I knew that, I didnt know what the "Mmmmmmm" meant.


SO even with the low boost Im running, my piping size is is still benefiting me?

Originally posted by DJ420a
SO even with the low boost Im running, my piping size is is still benefiting me?

It shouldn't affect performance much, if at all, at that boost level. Anyway, you'll be turning up the boost eventually, so you'll benefit from the 2.5" pipes. Do you have it 2.5" straight from the turbo to i/c and i/c to the throttle body, or is it staggered? For instance, is it 2 1/4" from the turbo to the i/c inlet, then 2.5" from the i/c outlet to the T/B?

Originally posted by fly1

Originally posted by DJ420a SO even with the low boost Im running, my piping size is is still benefiting me?

It shouldn't affect performance much, if at all, at that boost level. Anyway, you'll be turning up the boost eventually, so you'll benefit from the 2.5" pipes. Do you have it 2.5" straight from the turbo to i/c and i/c to the throttle body, or is it staggered? For instance, is it 2 1/4" from the turbo to the i/c inlet, then 2.5" from the i/c outlet to the T/B?

Everything is 2.5"

Originally posted by DJ420a

Originally posted by jltalon Most people run a low compression piston with their turbo setups. There is a greater chance of detonation with high compression pistons. High compression pistons are more commonly used in nitrous and all motor set ups.

I knew that, I didnt know what the "Mmmmmmm" meant. SO even with the low boost Im running, my piping size is is still benefiting me?

you'll get better response and more whp at a lower boost setting than someone at 8:8:1 compression....kicks ass.

With a compressor that large you should be right on. How big is the compressor outlet? 2.5"?

Yeah its 2.5"

hmm well I'm running 10.5:1, 2.5 is a little big I'm running partial 2.5 on mine and it would have weaker response and the bov would flutter but that was before I rebuilt my engine though. I think it should be fine.