Hey guys, so I was recently driving no issues, than I went to do a pull and my car didn’t seem to have the power it normally did. Every time I hit boost it didn’t seem to really… well boost (or build up pressure). Seemed abnormal. At the same time whenever I do hit boost around 3k I hear a pretty good whine/whistle that happens during boost. No check engine lights either. :(

please help I have no idea where to start.

 

Bad diverter valve, maybe? The original ones were prone to failure and there have been a few revisions of the part.

This is the R56 version, not sure of the year of your car so you may need something different. But see if there's some way to verify yours is bad first.

https://www.pelicanparts.com/More_In...7-593-273-M244

 

I’ll try that first. I’ll take off the diverter and inspect it today and let you know. Thanks.

Do you know if the diverter is the same as a blow off valve and if I could just swap it with that if it is bad?

 

Same purpose but they work differently. A diverter valve recirculates the pressure around the turbo, a blow-off valve vents it to atmosphere.

You can't put a blow-off valve on an R56 engine, it'll look like an air leak to the ECU and it'll throw check engine lights. If yours is actually bad just replace it with the right part, the new revised version is more durable.

 

Pulled off my diverter and the rubber part was shredded. Replacing it when it arrives. Definitely the issue

 

There you go. The original ones tended to fail like that, yes.

Fortunately it's a pretty easy fix, and the new design appears to be more robust. I preemptively replaced mine a few years ago.