Boost issue please help.

[Tezzer1988]

Ok so my leon cupra r 03 plate has a strange issue

The car was boosting fine until one day the boost guage read way to high and the boost sounded like it was being dumped with a big whoosh as I was accelerating. I stopped driving it asap because I didn't like the idea of the turbo over spooling and blowing something up. Anyway got it on vag com and no codes showing.

The only way I can describe it is like a clutch slipping but with the turbo if that makes any sense. The boost guage rises and the car slowly starts pulling but no where near like it did and the boost guage goes off the scale.

So far I have changed the n75 valve which gave the aggression back to the turbo but still the turbo guage goes off the scale and it intermittently boosts now.

I have checked for boost leaks visually and can't see anything and the garage it's currently in can't seem to locate anything either

I was wondering if anyone has had similar or know what it could be before I start spending money chasing the problem and replacing parts I don't need to.

Thanks and hope you can help

 

[Alexis27]

Recirc valve?

 

[Tezzer1988]

Hi I have replaced the recirc valve with a Forge 007P and it hasn't made any difference it was one of the first things I checked

 

[s1 evoloution]

have you checked any of the pipes that give the air pressure to the intercooler. i had a clip come loose car sounded loads of air turbo spooling loads the metal clip on the plastic pipe underneath the engine was letting out just enough escaping air pressure to notice. the tabs of the rubber pipe with the steel end had worn managed to clean the tabs and put clip deaper.stopped the air leak

 

[dazjstuart]

Mine had something like this a few years ago. It was due to the waste gate being sticky on the turbo. If it was stuck closed it would overboost then dump it all with a big whoosh. If it was stuck open it wouldn't boost much at all until you got to high revs. I tried everything, N75, recirc valve, pcv, n249 and all the hoses to no avail. The waste gate itself was seized and it needed a new turbo. Mine was giving an over boost code though.