Ok, after chasing the boost cut ( see the other thread ) and pouring over the logs, I determined that the car’s doing what it should. However, it did throw a plausibility error on the DV itself.

Today, removed the TurboSmart entirely to switch back to the uprated Pierbergh that came with the Frankenturbo... discovered that the banjo bolt at the DV of the vacuum line was free of the DV! Sorted properly now.

And now, I’ve got the infamous super knock codes. Swapped plugs for colder (1422s... planned to do this for insurance anyway) ... still got 2d52, misfires on #2. Swapped coils, still got 2d52 but now misfires on #3.

I’m thinking it’s not the plugs, it’s not coked up (fairly new block), it’s not broken lands, it’s not a single clogged injector. It’s not making the death rattle (timing chain is new).

Maybe it’s the AFR?
Maybe I should run it with race fuel to see if the code goes away? (But won’t that increase the chance of auto ignition?)
Maybe I should run it with a little E85? (But won’t that make the AFR out of sorts?)
Maybe the super knock sensor isn’t compatible with the 9.5:1 pistons?
Maybe it’s a dirty sensor?
Maybe the MAP sensor can’t handle the boost?
Maybe it’s the tune (since it’s substantially colder now than then)?
Maybe it’s the low pressure fuel pump not getting enough fuel to the HPFP (which I just replaced)?

Any ideas?

 

Hi Keith

Please empty your pm box...

I might have some insight into this

 

Post your thoughts in the thread, then if anyone else has a similar issue it is easier to find solutions.

 

It's guesswork at this stage, will have some better info later this month
So would rather keep my powder dry for now

 

hi

I just bought a 2009 cooper s r56, with a 2d52 super knock code. any ideas how to track down this problem. no other issues.

 

I just changed the sensor

Tbf I could be just shooting the messenger, but no more codes
Check the torque before replacing.....

 

A little E85 is worth a try. Injectors should be capable of handling 30% just fine.