mchristyuk
Junior Member
- Messages
- 668
Righty gentlemen..
You've probably ready numerous posts from me trying to capture my missing ponies that I'm convinced my 3200 had lost. To recap, it's running perfectly, just felt a bit lacking in "oompf". There has been a number of issues that I've resolved with the forums help (throttle pedal pot, knock sensors & leaking pressure pipes).
Things are much happier now, and certainly if I bury the throttle from standing starts she goes pretty much like I would expect. However when just cruising and putting the throttle in (unless I'm in Sport mode and really gun it so it drops down a cog and goes for the red line) she still feels a bit flat. I hear the turbos spooling up but I just don't seem to get the shove in the back of the seat I'd expect from 400 of Italians (almost) finest.
The symptoms got me thinking about whether a waste gate was stuck open, or not shutting fully. My reasoning being that at high revs and large boost the effect would be less noticeable than at medium boost.
Reading the tech documents suggests that the waste gates are sprung shut, and the boost solenoid opens them when over boost situations arrive.
So I thought if I removed the solenoid pipe to the waste gates that they won't get opened when needed.. obviously I won't want to run the car like this for long, but it would do as a quick test to see if there was any difference. If there was no difference at all, then surely a waste gate must be stuck open? If it starts to pull like a champion then the boost valve must be at fault...
So been out for a quick spin and it appears my limp mid range has indeed gone and the engine feels much stronger. So I believe my boost valve (pierburg valve) is at fault?
I've read the threads on here about them and I have cleaned and checked the connectors and they are clean and good. I've also applied volts to it and heard it click so as far as I can tell it's "working" as much as my basic tools can diagnose.
So to my questions..
1) Could the valve be reading incorrectly and therefore venting the waste gates early?
2) Could there be anything that makes the valve think the pressure is too high? (I can't see how as it's a pretty simple closed loop system..)
3) Is there an alternative part? I've read that they are no longer available.. but that most turbo pierburg valves are very similar and the chances are another one will fit? Certainly there are some VW ones that look very similar...
Cheers!
Mark
You've probably ready numerous posts from me trying to capture my missing ponies that I'm convinced my 3200 had lost. To recap, it's running perfectly, just felt a bit lacking in "oompf". There has been a number of issues that I've resolved with the forums help (throttle pedal pot, knock sensors & leaking pressure pipes).
Things are much happier now, and certainly if I bury the throttle from standing starts she goes pretty much like I would expect. However when just cruising and putting the throttle in (unless I'm in Sport mode and really gun it so it drops down a cog and goes for the red line) she still feels a bit flat. I hear the turbos spooling up but I just don't seem to get the shove in the back of the seat I'd expect from 400 of Italians (almost) finest.
The symptoms got me thinking about whether a waste gate was stuck open, or not shutting fully. My reasoning being that at high revs and large boost the effect would be less noticeable than at medium boost.
Reading the tech documents suggests that the waste gates are sprung shut, and the boost solenoid opens them when over boost situations arrive.
So I thought if I removed the solenoid pipe to the waste gates that they won't get opened when needed.. obviously I won't want to run the car like this for long, but it would do as a quick test to see if there was any difference. If there was no difference at all, then surely a waste gate must be stuck open? If it starts to pull like a champion then the boost valve must be at fault...
So been out for a quick spin and it appears my limp mid range has indeed gone and the engine feels much stronger. So I believe my boost valve (pierburg valve) is at fault?
I've read the threads on here about them and I have cleaned and checked the connectors and they are clean and good. I've also applied volts to it and heard it click so as far as I can tell it's "working" as much as my basic tools can diagnose.
So to my questions..
1) Could the valve be reading incorrectly and therefore venting the waste gates early?
2) Could there be anything that makes the valve think the pressure is too high? (I can't see how as it's a pretty simple closed loop system..)
3) Is there an alternative part? I've read that they are no longer available.. but that most turbo pierburg valves are very similar and the chances are another one will fit? Certainly there are some VW ones that look very similar...
Cheers!
Mark