Rb25 Turbo Installed On The Rb20 Today

[kit05]

had my rb25 turbo installed today but it lagged alot, so i got it home and put the rb20 actuator on and it is around 7, 7.5 psi, before it was 5psi with the rb25 actuator, i have read alott saying this will work, is the psi ok for this,will i lean out with this psi? thanks

Edited January 11, 2006 by kit05

[predator]

you aren't going off the factory dash boost gauge are you?

[kit05]

after market boost gauge

[predator]

ok, well rb25 actuator should be 7psi stock..

rb20 should give you 10psi stock, and that is what it gave on mine.

You are running aftermarket dump pipe, cat, and catback right? A restriction in there will stop you developing 'full boost'

It's quite possible you have a boost leak or something like that.. causing boost to bleed out somewhere, and resulting less in low boost levels. This will also cause your turbo to work harder/heat up to give that small boost level, which is not a good thing. So I'd check it out fully before going to nuts on it.

[kit05]

it has no leaks

[RB30-POWER]

rb25 actuator is 5psi actually.

the rb25 has a ecu controlled boost control solonoid that bleeds air to reach 7psi.

wizard2k (Josh) on here put an RB25 turbo onto his car, no real difference in spool at all, just the RB25 turbo pulls a little harder.

so you have must have a problem somewhere.

[kit05]

no probs with the rb 20 actuater spools nice just want to know if the 7.5 is good or will it handle ten without leaning

[kit05]

the only thing i need is a dump pipe , hard to find here in canada, i have blitz intake, 3.5 down pipe, 3.5 exsuast,acr inter cooler

[R31 POWER]

14psi was ok on my mates 20,had it dynoed and it was just starting to lean out up top but was still safe.eg a few more psi and it would of leaned put

[predator]

will be fine up to 12psi... 14psi if you're brave for a while.