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- Aug 20, 2015
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Hi,
2003 Audi S3 BAM, stock parts, probably mapped.
My main question is do I have a faulty N75; the actuator outlet does not completely seal:
I performed the N75 output test with VCDS and blew in the bottom/input. It cycled between diverting the air out the TIP outlet and the actuator outlet as it should. However when it was sending it out the TIP, there was still a bit of air coming out the actuator outlet. Is this a faulty N75?
Should it completely seal the actuator outlet?
If I'm correct in thinking it should seal completely, I assume this could this be leading to an overboosting issue?
And a bit more info specific to my situation:
-I have been having a boost spike of between 17-20psi at around 3,500-4000rpm, after which it drops down to 13-14psi. Requested is around 15psi the whole time.
-No N75 fault codes. Very occasionally '17963/P1555 - Boost Pressure Control: Upper Limit Exceeded'. Also two pre-cat lambda codes, new lambda is on its way to fix fuelling issues.
-Car is 100% stock parts from what I can see. I believe it must have had a map/tune before I bought it. Looking into quality of this map is next on my list, after fixing overboost and getting a smoke test
I've included a couple of 115 and 118 logs (2nd gear only, its wet and dont want to get too illegal on my slow local roads).
Thanks for looking, I normally try and sort everything out from the heaps of info already on here, but just want confirmation of dead N75 before buying a new one.
Cheers
2003 Audi S3 BAM, stock parts, probably mapped.
My main question is do I have a faulty N75; the actuator outlet does not completely seal:
I performed the N75 output test with VCDS and blew in the bottom/input. It cycled between diverting the air out the TIP outlet and the actuator outlet as it should. However when it was sending it out the TIP, there was still a bit of air coming out the actuator outlet. Is this a faulty N75?
Should it completely seal the actuator outlet?
If I'm correct in thinking it should seal completely, I assume this could this be leading to an overboosting issue?
And a bit more info specific to my situation:
-I have been having a boost spike of between 17-20psi at around 3,500-4000rpm, after which it drops down to 13-14psi. Requested is around 15psi the whole time.
-No N75 fault codes. Very occasionally '17963/P1555 - Boost Pressure Control: Upper Limit Exceeded'. Also two pre-cat lambda codes, new lambda is on its way to fix fuelling issues.
-Car is 100% stock parts from what I can see. I believe it must have had a map/tune before I bought it. Looking into quality of this map is next on my list, after fixing overboost and getting a smoke test
I've included a couple of 115 and 118 logs (2nd gear only, its wet and dont want to get too illegal on my slow local roads).
Thanks for looking, I normally try and sort everything out from the heaps of info already on here, but just want confirmation of dead N75 before buying a new one.
Cheers
Last edited: