Hello please help! I have 1999 tt 225HP. I have chipped it and for the first time everything was okay. Day by day my car was loosing power and boost power. I changed apexi power intake and it became much more smoother but still the boost wasnt the same. Than i changed air mass sensor and my car was like a rocket again until i changed myN75 valve to H version. My car became smoother and wasnt so powerful like before and i decided to change back to C version BUT F... it was still the same - car was smooth and very small boost. Please let me know maybe there are some ways to addapt N75 valve to the car. Maybe there can be other problems????? Please Help

 

you might have just a bad DV check that and then try an N75j i think it might work better

 

Dude, slow down with the changes, you're gonna freak your ECU out if I'm not mistaken. Give it time with each upgrade, about 40 miles seems to be the average. I BELIEVE the ECU needs to adapt every time you replace a DV / intake. Under normal circumstances, I'd think there was a leak at first, but it doesn't sound too much like that. Worth checking out, anyway, as I could be wrong with my limited experience with these vehicles.

 

Thanks for advices! At the 1-3 rpm it is going okay but than it dies. From 4-7 its runnin without turbo I guess! Maybe You got something else to say????

 

Try unplugging the MAF and driving it. If the problem goes away, your MAF is dead.

 

1-3 the car pretty much doesn't boost anyway... are you triggering limp-home mode? (the minimum boost level, I think 5 psi)?