Help! Boost doing funky things.
 

[URL=]http://www.youtube.com/watch?v=FKYlusq8ER8[/URL]
Linked video is a shit camera-phone recording of the issue, for demonstration purposes... 2nd gear, from slow roll.
I left the car garaged for about 2-3 weeks, came back to drive it, warmed it up, and noticed this happening....
Boost leak? Or something worse :confused:?
It reaches peak boost fine, in-fact I had to boost hard three times before the symptom showed itself again for me to record it.
I've had a quick look at the vacuum lines and couldn't see anything major. what else could this be?
It doesn't feel any different to drive, it's just the boost gauge that's rather off-putting.
The only recent modifications under the bonnet is an oil catch can, around 2 months ago. Nothing else has changed.

Anyone have any suggestions?

boost solenoid? sticky wastegate?

do you have anyway of logging data from your ecu?

What does it do in 3rd or 4th where the loads are higher?

What is boost it tuned to run?

[QUOTE=American Dave;430805]do you have anyway of logging data from your ecu?[/QUOTE]

Don't believe so, I don't have an AccessPort, and have plans for Verso in the future.

[QUOTE=Rossco;430815]What does it do in 3rd or 4th where the loads are higher?

What is boost it tuned to run?[/QUOTE]

18psi is what it's tuned to, Unishit's maximum.

I'll check 3rd and 4th when I get a chance tonight.

so, when the car was off, blew some compressed air at around 15+ psi down the vacuum lines, no obvious leaks of any kind (air rushing out of some hole).
removed and refitted the BOV vacuum line, removed and refitted the defi guage vacuum measurement line (enters the manifold at the front left - if your looking at it from under the bonnet).
took the car for a spin after this, and it no longer hits its desired 18psi, it boosts to 15psi now.
2nd gear drops from 15 to 11ish psi, the rest hold 14/15 psi fine (1/3/4).

any thoughts?

1.Clean the boost control solenoid with some good quality aerosol throttle body cleaner, sounds like it's sticking/gummy.

2. Check that the bov isn't leaking (with the engine at idle, spray it down with same cleaner that you'll use for the solenoid, if the idles stumbles the bov is leaking & knackered).

3. check all hose clamps between the turbo and the throttle body, tweak them all a little tighter.

Report back!

[B][U]P.s Don't blow more than 9-10 psi down the boost control lines, you may rupture the wastgate actuator's diaphgram.[/U][/B]

[QUOTE=fastR;430818]Don't believe so, I don't have an AccessPort, and have plans for Verso in the future.[/QUOTE]

3 choices

1. take it to your tuner / mechanic for diagnostic
2. pm me and we will arrange to meet up and log some data from your ecu
3. get Ross to tune with his screwdriver :D

being a moderator rocks Rossco :p