Boost Difference

[Manuel Kasko]

Hey guys.

Some of you may know I been stressing over if I have a vac leak or not and after hooking up a compressor I couldnt find anything.

Finally decided to give the car a beating today after getting my clutch sorted and I had a strange issue.

Seems in 2nd where it used to build up 20psi very quickly is only building up to around 18 and is pretty sluggy.

Once I get it into 3rd it makes 20 psi still.

Just seems odd as it's running straight off the actuator which is a 20psi spring

Any ideas would be appreciated

[scotty nm35]

Have you checked the cat?

[Manuel Kasko]

Already Smashed out ages ago

I have tried the pressure test and tried blocking off all the parts air was coming to but couldn't find anything.

Also checked all the cooler piping.

I wish some in the ACT had a smoke tester because that would be perfect

[r33-20s]

Do you run a bov might be leaking boost

[Tai1or Made]

No BOV=ZTUTUTUTUTUTUTUTUTUTUTU.

You know you want to.

[Old Booster]

I'm in the act and have smoke testing...

[Manuel Kasko]

I'm in the act and have smoke testing...

Pm sent

[Old Booster]

I'm in the act and have smoke testing...

Ha Ha ....lies

[Old Booster]

sorry could not resist

[Trozzle]

Already Smashed out ages ago

I have tried the pressure test and tried blocking off all the parts air was coming to but couldn't find anything.

Also checked all the cooler piping.

I wish some in the ACT had a smoke tester because that would be perfect

Autotech do I believe.

[Manuel Kasko]

Might have to call them I guess

leaking rocker cover gasket can't cause this can it?

[Manuel Kasko]

So honestly can a leaking cam gasket cause this?

Because the guys down here quoted me $130 for the smoke test but I don't want to pay that to find he tells me it's the cam cover gasket.

I don't really understand how it works

[GTSBoy]

Leaking cam cover gasket would have to be a gaping hole that would piss oil before it would let enough air in to affect running. The typical weepy gasket certainly won't, otherwise all RBs would run like that.

[Trozzle]

Think about what boost is, and what determines boost. This leaves you with a handful of possibilities:

Leak in intake

Faulty BOV

Faulty actuator

Faulty boost controller

Blocked exhaust

Then on the unlikely possibility it's the turbo at fault:

Faulty waste gate flapper

Could also be faulty boost gauge showing wrong when nothing has changed.

[Manuel Kasko]

Nah you can hear it whistle when around about -40 to -50 vac

also still has a whine noise when on boost.

You can also notice it is lacking in power.

Jez has told me to make sure the turbo is secure which I will check as soon as I get home.

Also will check all the bolts on the exhaust.

When you stick your head in the engine bay and rev it real hard you can smell exhaust fumes but unable to determine if thats just blowing back from the exhaust or not.

But yeah checking all the bolts and will report back

[DVS JEZ]

U get a chance to check?

[Manuel Kasko]

Yeah the turbo dump was a little loose.

We did them and checked the turbo bolts but they seemed fine.

Took it for a spin and it was boosting fairly well.

2nd gear seems to make boost different to when in 3rd which I didn't think was possible.

On the way to work it still managed to whistle again at around the same vacume.

Not sure if related but I cleaned the AAC and put that back on plugged it all back in and no matter what I do the car idles at 1500rpm unless I unplug it

[Dose Pipe Sutututu]

Maybe the AAC hose is damaged? there was a thread like 3~4 years back where one guys' AAC hose (from the cross over pipe) melted and couldn't work out why it was running like shit. Turns out the underside melted because of his turbo.

Just a though

[Manuel Kasko]

Pulled that off and checked and it's all fine

Thanks