Hey guys, I'm having some pretty bad boost issues and thought I'd try here first before throwing a ton of cash for diagnostic fees etc. I just replaced the turbo inlet pipe because it was collapsing under boost but I'm still having some issues. Under accelleration once boost is built it has a lot of stuttering/popping above about 15 psi and then kicks into limp mode until you let off and completely spool down. Also boost will build up to 23-25 psi very frequently, which is very scary for a motor with 190,000 miles (tuned to 18). I'm not too familiar with the turbo systems in these cars and haven't seen anything online that really matches up with my current problems. Could it be a wastegate or n75 isuue? Any help would be GREATLY appreciated. I just bought a FR-S and really need to get this car up for sale. Thanks!
Hopefully you can kind of tell what's going on in these.
Blowoff or recirc? I tried putting a blowoff on mine so many years ago, but car always went to safe mode because it did not see the air that was blown off. So long ago that I don't remember exactly how it acted, but I had to turn off the car and turn it back on to get it to go to regular boost again.
2001 TT 225 blk/blk(13.6@98mph w/1.7 60') 3" CB with Flowmaster and H&R Coilovers < SOLD regret
1987 Audi 4000q < SOLD
1992 Passat Wagon aka: the draggin wagon < SOLD
1988 Audi 90 cammed < SOLD
As you walk away from your car after you park, do you look back? if you dont you got the wrong car.....
"If everything seems under control, you're just not going fast enough."
"Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
2010 Premium plus, black on black, 6MT, B&O, Tips, Stasis Touring Kit, Stasis ECU Flash, Xcarlink, GPS touchscreen. VMR 708 18' wheels, Lamin-x, APR CARBONIO INTAKE
Does the turbo have lots of power still or does it feel gutless (gutless could be bad turbo)? Smoking any (bad turbo, might be able to be rebuilt with factory kit)? Does the car have no power off the line and then hammer hard all of a sudden when boost is high (pressure and vacuum leaks can cause this, use a smoker at very low pressure to find them, and bump up pressure slowly as you fix the leaks)? Does it feel good but drop power at near full boost (could be bad recirculation valve, get the 71 model for cheap or go nuts and get a custom one, but the 71's are more than fine for stage 1)? Any high pitched squealing noises under boost (bad turbo, and the spindle and fins are probably running out and hitting the exhaust housing portion of the turbo)?
Have you had anyone check the car with a vagcom type setup to see if it has triggered any codes, those are extremely helpful and key in your troubleshooting. I bought the Ross-Tech vagcom adapter for $250 so I can consistently monitor my car for problems since I am keeping the car long term.