Hi All.

I am still battling the P2885 code and have done a number of things up to and including rebuilding and cryo-treating the turbo using GPop.

The thing I am noticing is that the turbo is slow to spool leading to the mismatch in boost levels that the car is expecting vs actually seeing.

My question to the forum experts is: what are the things that can govern how quickly the turbo spools?

My thoughts are maybe the oil feed line is just gummed up leading to a lack of lubrication for the wheels in the turbo. There must also be some electronic governor that manages spool because when I get the P2885 code, there is hardly any spool at all, so its not just exhaust gas flow, there is something more to it.

Anyone have any ideas?

I really don't want to replace the turbo. I am totally DONE with throwing money at this problem and would love it to be something simple at this point.

 

Check the wastegate. If it is opening incorrectly then the turbine won't spool as intended.

 

I asked GPop whether they checked the operation of the wastage and they verified that it operated as expected. I have also had the vacuum pump and lines replaced so don't believe those to be bad either.

 

How old is you diverter valve? Have you pulled it out and looked at the diaphragm?

A bunch of other things to check:

http://www.jmturbocoopers.com/2885-B...DEVIATION.html

By the way, I have a stock S turbo in very good condition with 24,000 miles on it for sale if you do decide to go that route. I'm asking $450 shipped.

 

I have looked at the JM site and have gone through most of those fixes to no avail.

I may take you up on the turbo. Was it running a tune in its life? boosting around 20psi?

 

Sorry I just have a hard time believing that it's the turbo itself. I can only imagine how frustrating it is.

With regard to my turbo for sale,

In came from my 2013 S with N18 engine. I believe it to be compatible with the N14 but please verify. I only removed it at ~24,800 miles to upgrade to a JCW turbo. My car uses zero discernible oil between oil changes. Oil changed every ~4,000 miles at the dealer. And I almost always idle down the car before shutdown

I always had some sort of tune. First was the JB+ installed at ~2,000 miles, then the Manic Stage 2+ Map A at ~14,000 miles. Typical peak boost for my map A is 18-19 psi with steady-state at 16-17 psi. I've only tested map B for a few days when I first got the tune and at the very end so that I had recent data logs to compare to the JCW turbo. I've have never used map C since I don't have the failsafes hooked up on the meth kit. I've had meth installed for most of the time so that keeps the intake temps down which in turn keeps the boosts levels down.