Since you are not using the stock ECU, we need to see your turbo transition tables and your duty cycle tables.

You do have a separate solenoid for pre control and wastegate just like stock right? You're not doing the whole 1 solenoid for both actuators thing I hope.

 

I also checked it with the OEM ECU there is the same problem.
So the ECU can be excluded. I will remove the turbos and check them for damage

 

I'm plumped them like this:

 

You can inspect the turbos with them on the car... Just take off the y-pipe and intake tubes and you'll have easy access to the turbos (secondary from underneath the car). If they spin freely, have no excessive shaft play, there's no obvious damage and no oil leaks from the housings, they are likely fine.

 

I'd check your pre-control actuator. Tap the line and give it 10 lbs and see if it opens. If it's opening early, adjust the arm length (shorten it). Also check that there's a restrictor pill in that line, or at least in the turbo comp housing (if they are later series turbos).

 

I', driving a s7, so there are no restrictors inline. They are integrated in the nipples in the compressor housing.
You can see it here:



prespool is opening at 170 kpA absolute wihch is 10 psi or lbs of boost if I'm right.

 

Finally I found the problem.
This Catalytic converter has only 2000kms on it..
Maybe I shouldn't use launch control anymore

 

WOW. Yep, there's your problem!

The funny thing with sequential problems is SO MANY TIMES the problem isn't the twins or the control system it's a boost leak, exhaust restriction, etc.

Dale

 

I just didn't think it could be the cat after being so new.
But the whole thing has an advantage. I've got a renewed vacuum system with Porsche valves and new hoses.. :-)

 

Is that a ceramic or metallic cat? Do aftermarket metallic substrate cats fail also?

 

This is a aftermarket Metallic Cat. And as you can see, they DO fail ;-)
But I think it's my fault, because is was driving with ignition cut instead of fuel cut for rev limiting.

 

Wow, well that makes me a bit nervous about the longevity of mine. I have a 3" high flow RE-Amemiya unit which has seen a few track days and unfortunately a lot of traffic around London so I should probably have a look at it and make sure it's doing alright.

 

This Cat is a 150 euro part. I think a RE cat has a better quality

 

I wouldn't be so sure. The inside of the RE-Amemiya looks like all of the other 3" high flow cats out there like the Magnaflows, etc. They all probably come from the same place in China somewhere and get marked up based on the name they are selling it under. It looks kind of like this inside which most do unless built by HJS.

I bought mine used so didn't pay the RE-Amemiya premium and never would have had I bought a new one.

 

One interesting fact about my destroyed cat.
I passed the emission test with this destroyed unit without any problems..