Boost problem folowup (wastegate issues maybe??)
Thread Starter
AudiWorld Senior Member
Joined: Mar 2004
Posts: 1,421
Likes: 21
Boost problem folowup (wastegate issues maybe??)
So i have previously posted up with boost problem (topping out at 1.20bar)
and so the other day i was driving and the boost creeped back up to about 1.35 bar but is still not peaking at the usual 1.65etc
and now i get a loud 'woooohhhhhhhhh' noise under WOT and only when is boosting over 1.30bar....now the turbo is only 10k miles old and is NOT a turbo screeching noise of whatnot...so i know is NOT the turbo dying....the noise sounds like a leak or a valve not closing correctly...
all hoses are check and just actually replaced the two IC feeder and IC to intake hoses with SAMCOs
but problem is still there...no other leak is found at this time......and i have a STRONG feeling that its the wastegate (everything else is checked, MAF is new, coolant sensor is new etc.)
now my question how could i tell if its the wastegate (or wastegate acuator) acting up ??
TIA
and so the other day i was driving and the boost creeped back up to about 1.35 bar but is still not peaking at the usual 1.65etc
and now i get a loud 'woooohhhhhhhhh' noise under WOT and only when is boosting over 1.30bar....now the turbo is only 10k miles old and is NOT a turbo screeching noise of whatnot...so i know is NOT the turbo dying....the noise sounds like a leak or a valve not closing correctly...
all hoses are check and just actually replaced the two IC feeder and IC to intake hoses with SAMCOs
but problem is still there...no other leak is found at this time......and i have a STRONG feeling that its the wastegate (everything else is checked, MAF is new, coolant sensor is new etc.)
now my question how could i tell if its the wastegate (or wastegate acuator) acting up ??
TIA
Thread Starter
AudiWorld Senior Member
Joined: Mar 2004
Posts: 1,421
Likes: 21
yep did that also>>>
and no help at all
i actualli have the BM and all the mods off (BAMM, BM and N75 race is off) all i have is the REVO turn on and once it hit 1.30bar i'll here the loud trumpet noise
PS another thing i have notice is that when the boost is at 0.00bar (partial throttle) i hear this low light humming noise...which i think is also related to it
i actualli have the BM and all the mods off (BAMM, BM and N75 race is off) all i have is the REVO turn on and once it hit 1.30bar i'll here the loud trumpet noise
PS another thing i have notice is that when the boost is at 0.00bar (partial throttle) i hear this low light humming noise...which i think is also related to it
Junior Member
Joined: Mar 2000
Posts: 4,404
Likes: 1
N75 could be going south and throwing you into a limp situation
Check the wastegate linkage to ensure its not binding up on the housing ro any hoses down there.
The cable connected to the N75 could be failing...
Vacuum line to the DV could be split...
Put a hand pump on the vac line to the Wastegate actuator to see if the linkage moves once vac is applied..if it moves and holds you wastegate actuator is probably ok...after all that thing is pretty well protected from the elements.
The cable connected to the N75 could be failing...
Vacuum line to the DV could be split...
Put a hand pump on the vac line to the Wastegate actuator to see if the linkage moves once vac is applied..if it moves and holds you wastegate actuator is probably ok...after all that thing is pretty well protected from the elements.
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Audiworld Junior Member
Joined: May 2006
Posts: 355
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From: Cincinnati, Ohio
N75's can be tricky to tell if they're going...
I took my car to Audi and they said my wastegate valve was intermitantly working. They seem to be a very common part to fail tho, it probably wouldn't hurt to replace it also.
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Have you checked the hose going from the turbo outlet to the charge pipe? -->
Mine had the same sound at high RPMs when it was ripped up.....here is a Forge Motorsports silicone replacement...<ul><li><a href="http://forgemotorsport.com/content.asp?inc=product&cat=0108&product=F M225TH">http://forgemotorsport.com/content.asp?inc=product&cat=0108&product=F M225TH</a</li></ul>