i bought audi s4 year 1999, 2.7 bi turbo...it`s great...i got the chip, which programmed my ecu till 310 hp...it was alright for about 10 min, when it was gone...i poped the hood and saw that the pipe to diverter valve was off...i connected it and it was okey again.
Then i changed my diverter valves, it was stiil okey, till one day when i didn`t feel the boost..i got all the pipes checked, but it didn`t work....now i feel that my turbos aen`t spinning, i`m just running a 2.7 motor.... i have changed the air maas sensor, tried to change n 75 valve from audi tt, is it work.....but no, and my diverters are warm, not hot as always

Could you someone teel me what could be the reason?? i`m fed up that a 2.5 litre bmw is running better then me

 

You meen 2000 S4. Maybe it went into limp mode, something like that if its not building boost, But I just drive the S4 not very engine savvy. Good luck

 

Your post is really hard to read, can you use proper grammar & punctuation?

What chip do you have? What DV's are you using?
Did you check for any codes? Is the CEL on?

It sounds like you are in limp mode, or you have a big intake leak. I would check the TBB, you might
want to take it off to inspect it.

The TT N75 is not good for the S4, it's calibrated differently, and will give a weird boost curve. If your
N75 is going, it will cause a CEL & even limp mode.

 

I`m sorry about my grammar!
i got the chip in a kind of shop. in my country it is called chiptuning.lv
they somehow took my ecu out and reprogrammed it...about the DVs, i bought them from ebay..those are greddy style...but it was okey when i put them on!

i don`t understand what do you mean with this limp mode??that it is not running properly?

and what is TBB???

in the place where i put my chip on they said it could be the regulator off a turbo, which can sometimes rust and not move properly.

 

Now I feel like an ***, didn't know you were not in the States.

Limp mode is a safe mode the car goes in when it detect a problem with the car that can cause real bad damage.
The car will be stuck with 5psi of boost & just have not power. Usually when it happens you get some engine codes.

The TBB is the throttle body boot. It's a known failure point. It likes to rip. Some of the rips can only show up under boost.
This will cause limp mode.

 

that`s okey!
i`m gonna go and check my car for some codes

thanxs!!!!

 

your problem may be the DV's. I tried my luck and bought the greddy style (its a cheap knockoff) from ebay for my saab. Technically the type s is a BOV, not a DV, but it is easily used as both. The problem i think you have is that because the DV is a knockoff, lousy materials are used and can cause extremely early premature failure. the BOV i used lasted 2 monthes before it crapped out. if you're still having problems, go out and get a reavl DV like the forge 007 or something of the like

 

You mean BPV right?

 

yea BPV/DV

same thing