I've been searching and searching for awhile now, and decided to make an account on the audi forums to finally sort this issue out. Any help would be appreciated, but basically car runs great when cold. Once heats up I get a lack of power, and soon after the car will hit max boost and stay there like it should but it doesnt pull like it should and you can hear the turbo working but it just doesnt feel like your going anywhere. So I wanted to see if anyone has had this issue or has known anyone to have this issue? 01 a4 b5, APR chip. I've done some research and this problem does sound like it could be N75, coil packs, and fuel pressure regulator. Any help would be greatly appreciated thanks!

 

You're getting full boost but it doesn't pull like it should? Doesn't make a lot of sense.

Has the car been misfiring? Flashing check engine light? CEL on at all? When is the last time you changed the spark plugs? What temperature plugs are you running? What diverter valve do you have?

Saying you have full boost but the car still feels slow doesn't lend any direction to trying to figure out your problem.

I also hope you aren't beating on the motor when it is cold.

 

No I definitely am not abusing it when cold you can just feel the difference not even having to get on it. Aftermarket DV forgot what the name of it is. No flashing engine light only cel is 02 sensor because of down pipe but it was doing this before I installed it. Spark plugs are oem not sure what temp. I know it sounds funny, I really am so lost about this issue. Itll happen once in awhile and today driving to school she seemed to be working great

 

A new set of spark plugs is a cheap way to rule out a component.

Since you are chipped you should be running a colder plug. I recommend NGK BKR7E plugs gapped to .028.

 

has the coolant temp sensor been changed for the green version yet?

 

No, the temp sensor has not been switched yet. And thank you for the suggestion on spark plugs ill definitely try that idea. Such a weird problem to me. Sounds like a boost leak but im still maxing PSI and ready online that 20HG is fine. Is that correct?

 

And will the coolant temp sensor really effect that? Ive noticed that once in a blue moon, the temp sensor will go a little above normal while stopped

 

the coolant temp sensor is a very ommon issue with these cars. change it out to the updated green version. even if it isnt your problem, it will be a problem eventually

 

Ok, sounds good.

Thanks

 

Took a video of the issue today just have no idea how to upload it