under boosting

[stumpy83]

fitted my boost gauge today and found it to be only boosting at 3 psi?
which iirc it boost 8 psi?

ive tried to find a leak but only found two breathers that was split and perished. once replaced didnt make a
difference...

can anyone point me in the right direction?

i would like to run vag com to try and check the maf is working right, if someone can advise me how to i would be
very gratfeful please

 

[S3featesV9]

Slight kink in the pipe you fitted? I had similar issue when I installed my gauge

 

[stumpy83]

checked that i also ran a second pipe to make sure of that

 

[s3dave]

Really could do with it on VCDS to rule out boost gauge...

 

[Syvo]

check there is nothing blocking the pipe on the gauge mine had a bit of plastic covering it when took it out of the box also i think it should be 10 or 12 on s3 mine is 10psi on 1.8t quattro standard

 

[stumpy83]

Defo not gauge seen it working in another car an pipe is clear as a whistle??
Gonna hook it up with the solus tomorrow on the digi boost gauge to make sure
100%

What else could it be MAF??

 

[Rick @ Unicorn Motor Dev.]

You are running on actuator pressure only, the N75 isn't allowing any more boost. Lots of reasons for this, but a fault code read is your first move.

Rick

 

[stumpy83]

So I feel a little sill I had a another look over the engine today
And found the MAF sensor was unplugged abit.
Now it's boosting around 5 and 6 psi

 

[slowcoach3]

Thats good its running higher but shouldn't it be 11/12 psi? I don't know if the autos are differnet but shouldn't most 1.8t's run higher than that...

 

[stumpy83]

I'm a little unsure?? I was told standard psi is around 8?? I could be wrong though?

 

[Prawn]

Grrrrrrrrrrrr. If you *****es don't know, don't post you'll only confuse the poor man.

Shauns car has an AGU engine, so has no boost sensor so it can't be checked on VAGcom or a solus. the ONLY way to measure boost on the AGU is via a mechanical guage.

Also, 6psi is about bang on for a standard 150bhp AGU. 10psi is for an AJQ/AUQ 180bhp engine.

Sounds like it's running fine to me Shaun, MAF logs looked good when I came out with you, peaking around 120g/s which is bang on for a standard car.