tuneda4

i am pretty sure that is the issue with my car. I have a revo tuned gtrs setup and i can not pull more than 5-9pounds of boost. the exhaust note is very loud and the power is non existant. I get going and floor the car and it will go nowhere and then all of a sudden when i get to 6k the power comes back. i have not had the chance to run the vag on it and will prob not be able to do till this weekend. i am also not getting any cel. thoughts? thanks1

Ertman

anything else would be just guessing.

tuneda4

this has to be related to my n75 but i agree, anything else would be a guess

tuneda4

unplugged the maf and the car was running better but still had no boost. any thoughts? i hope this isnt my wastegate. could this just be a faulty n75?

DenverNoob

small boost leak is entirely possible. enough to throw ur fuel trims into a condition in which the ECU is getting you into soft limp (but just barely).

here is how the ECU fueling works...

say you have a little bit of a leak and you are running a tad rich...the ECU can adjust fueling + or - 25% before a code is set off (assuming no other issues)...ad does so actively. in VAG-COM, one can view what the ECU trims are in block 032, although these #s are rolling averages attained at part-throttle cruising. if you see a correction of + or - 16-18%, there is a VERY good chance the ECU is seeing a spike periodically at 25%, and hence it will go into soft-limp without codes necesarilly being thrown. moreover, the ECU will remove soft-limp automatically after a few cycles of the fueling coming back into acceptable trim...again without any codes being stored.

the point here is that a small leak (boost or vac in fact) can cause these symptoms without nary a code being thrown or stored...only logging the car will tell....