2nd Gen JCW Most liked posts in thread: Too much boost and a diverter valve code????

So the car goes into limp mode, you take it to the dealer and pay them $145 for diagnostics. The tech says everything is working correctly but the car still goes into limp mode. Hmmm, doesn't put much confidence in the tech.

What it the actual code that is being triggered? If you're overboosting then it could be a wastegate issue.

EDIT: You said you monitored boost pressure, and it was a little high. I don't think limp mode kicks in until +22 psi.

 

Have you seen this post at NAM? I queried Google, "P28AA Bypass Valve Error" and found this.

https://www.northamericanmotoring.com/forums/r56-hatch-talk-2007/238653-2007-mcs-jcw-lost-power.html

Someone had the same code, replaced his diverter valve, still had code. It turned out he left a part from the old diverter valve on the car when he installed the new one.

 

I got one of those. Easy installation, less boost lost during shifts, all in all a good investment.

 

Always good to hear that a problem has been solved !!

 

Now go get that DV from GFB!

 

GFB FTW!

 

I don't have any codes but I do have a question. This MINI is my first ever forced induction vehicle and I'm not familiar with the differences between a Diverter Valve and a Blow off valve (I know one recirculates and one vents to atmosphere). Should I hear a release of pressure from the DV that sounds very similar to a blow off valve once I let off the gas? It's sounded like a Blow off for almost as long as I've owned the car. Is it safe to assume that the DV is torn?

 

Do you have an aftermarket intake? If the sound of the intake isn't insulated well you can hear the dump of air into the intake from the DV. I forget which brand I was looking at before I sold my R56 but there was an aftermarket intake company that had a well perfodming and noisy intake. You could hear the diverter dumps clearly when you snapped off the gas.

If you had a torn DV then you would most likely throw a code but if it didn't there would be noticeable lag in the turbo and a general loss of power.

There are aftermarket BOVs for the R56 but in general they just "sound cool" and leave the engine running rich if not properly tuned.

 

10-4, thanks! I do have a DOS-ish style intake. The reason I've recently been researching them is due to the DV not always opening up upon start up when it was cold last week. I wasn't getting the usual hiss from the intake so I started looking up how to know if my DV is bad. I'm at 93k so she may be on the way out.

Thanks again!

 

DOS! That was the brand I was looking at. Yeah noisy diverter dumps and intake "whoosh".

 

I just copied the concept :cornut: With the bends it's not AS loud as the normal DOS config, originally ran it straight in but it was too loud.