over boosting/boost creep? help!

[Guest]

i've got a v3 wrx sti. i've taken in to the shop an they are not sure wat the problem is.

its goes like this.

1st gear-15psi

2nd gear-18psi

3rd gear-20-21psi

4th and fifth gear-23 an above thats when i cuts out.

also if u r driving in 5th and put foot down it will just boost straight up to 23 psi-fun but now annoying as i can't drive it like i should b able to

anybody got any ideas?????

[Guest]

Sounds like your factory boost controller is stuffed

Mine did the same but mines in a 1992 RS Legacy

I went for a after market controller and it fixed it

[subiv5]

Having a Pod filter/aftermarket intake and/or a full exhaust system can cause the boost to spike.

This could be the problem.

Not sure what boost cut is on the V3 turbos but wouldn't imagine it would be anymore than what you are hitting now.

If you have the above I would replace the intake with standard one and see if that makes a difference. I have also heard of people drilling the "pill" in the boost line slightly bigger and this helps keep the boost stable.

And yeah as above, the controller itself could be stuffed

[Guest]

have changed the factory boost controller not that.it been doing it since i got it and it had factory airbox and all that.only thing it has got is custom extractors.could it b that?

[kamineko]

positive pressure from the turbo is fed to the wastegate actuator via a solenoid which allows the ecu to manage the wastegate

there is a restrictor pill (small bead with a fine hole) in the line between the turbo and the solenoid. it should come off a metal T on the turbo compressor housing, just under the forward drivers corner of your topmount intercooler. it can get blocked so try checking your lines

or the solenoid could not be opening. hook your black and green cel check connectors together, turn key to ACC ON an the ecu will pulse all the sensors, turn the fans etc as a diagnosis. you should hear the boost solenoid chatter for a moment every few seconds. if its dead quiet, replace it

[Guest boostin]

Put a new piece of vac hose straight from the compressor outlet to the wastegate actuator, bypassing the boost controller. If the boost is a flat 10ish psi in each gear, you have either a blocked boost control line or a stuffed boost controller.

[Guest Bemrose]

after-market ecu?

hell id kill for that setup