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View Full Version : J4 low boost turbo setup

Liam_
2nd October 2011, 21:31
I have a couple of questions for the boost nutters among us. :)

How much boost can a standard J4 engine take without lowering the compression using a decomp plate etc? What sort of power would this level of boost equate to?

Cheers
Sophia_Bush
2nd October 2011, 21:41
totally depends on the mapping can run decent boost if its spot on
miamibluebaby
2nd October 2011, 21:53
as above how big are the chones!!
dannygti
2nd October 2011, 22:00
7psi

depends on LOTS of things. from 160-240 depending on spec
Liam_
2nd October 2011, 22:17
7psi

depends on LOTS of things. from 160-240 depending on spec

Gotcha.

I'd be happy with whatever power is classed as 'safe' for an MA box with Quaife ATB - something just south of 200bhp ATF? Car will probably be doing ~4 track days a year.

What sort of turbos should I be looking into - Garrett T25?
dannygti
2nd October 2011, 22:21
depends mate, so many things to think about.

what is your ultimate goal, will it do more road miles than track miles.. have you sorted everything else out like mounts, fuel pump, clutch etc.

gt25 will be good upto 270hp