Boost not meeting requested, graph inside

[pudding]

Negligible effect on boost levels and wouldn't cause a 4 PSI deficit across the RPM range - based on my own experience with a K03. Besides, looking at the log, the knock level is not constant and it is peaking, most likely at a certain load/RPM so wouldn't explain the drop across the entire rev range

The amount of correction is based on the severity of the knock detected and will depend entirely on the requested ignition timing - its not comparable on different cars & setups. Its not ideal but the ECU can deal with up to 12CF so its not an issue for the purposes of this diagnosis. At 2CF you probably have no real knocking going on and you may not even have any reduction in timing, its just a Correction Factor and does not directly translate to X amount of degrees of timing retardation

Anything up to 5CF for short periods is fine anyway based on what I have seen over the years from many logs and heard from tuners themselves, 2CF at most tells me you have a safe map with headroom for more, but again it depends on a lot - ambient conditions, whether your 2CF peak was after a single run or after repeated back to back runs for maximum heat etc.

Off topic a little, sorry! 

Aye, I was just concerned that amount of knock isn't healthy in the peak cylinder pressure zone.  'CF' was more ME7. Timing delayed in .75 degree chunks every XX crank rotations until it stopped.  MED9 is different.  The KW shown in the knock regulation activity is the actual degrees pulled.
Anyway, it seems like the hardware is good, which was the initial concern.

[v4rley]

MAP sensor is 038906051D so looks to be 2.5bar one

Will do some logs later, anything else to try / investigate?

[v4rley]

[pudding]

Timing retardation looks a little less on that one, probably because the IATs are colder now.

I find the graphs a bit hard to read without rpm or load on the horizontal axis!

[v4rley]

@Pudding Yes does look a bit happier this time.

Understand about the lack of rpm on the graph, not sure if I’m not including in the log or the way it’s programmed @dazza

Any suggestions what to try next?

[pudding]

Not sure mate.  Apart from the timing pull and strange HPFP spikes, nothing really jumps out as a massive concern.

I'm guessing all the dips are you changing gear / slowing down?

Ideally, a nice 10 second burst of full throttle in 4th would be good to see if everything matches the targets, but it's not always doable on the roads!

[v4rley]

The logs are all 3rd pulls from 1.5k to redline. I know it’s not ideal graphing but if you look at the top rpm graph it follows down through the other graphs, ie the peak in the rpm graph aligns down the page with rail pressure etc.

Ok I am great full for the help from everyone and appreciate its a limited being diagonosed over a forum but just try to ensure I have exhausted all possible avenues.

[pudding]

Ah OK, so in the G79 Pedal position graph above, that dip down to ~50% wasn't you letting off?   If not, that isn't good.  Would be interesting to see if the throttle position mirrors that dip.

Yeah internet diagnosis is tricky!

[MIJ_JAGGER]

Wish I could help on something like this! I haven't the foggiest though, wish it was something simple as just "change the DV"
Legends Dan and Pud will see this sorted hopefully!
Good luck James mate

[Pesky jones]

I too thought the dip was V4rley letting off the accelerator before going back on it- almost like two separate runs.

Is it infact that the above graphs are of one, constant pull?

Is it worth noting that lambda stays at 0.8ish throughout the pull, it doesnt rise up back to one (as would be expected if letting off the throttle)

[pudding]

It depends if the throttle closed 50% as well, and also how quick that blip was.   At WOT and high rpm where everything happens so fast, lambda is notoriously poor at detecting transients, and is also too slow at making fuel trims at those rpms.  It is for that reason a lot of high performance engines switch to open loop under high load / rpm conditions.  I would say if Varley didn't feel that dip, lambda sure as hell wouldn't have 'seen' it either.

We might have to resort to reading the data row by row in Excel......which I hate.....so Dan can do it 

[v4rley]

Hmm, cannot recall the exact even at the dip, it was a 3rd pull and changed into 4th (dsg so no lift off) but on limited open road and high in the 4th hear rev range I could have hesitated and momentarily lifted off.

Thanks for the kind words @MIJ_JAGGER

[pudding]

Ah....if it's DSG, I think it does momentarily cut the engine torque during a shift, not that end users feel it.   Sorry, I was diagnosing with a manual gearbox in mind.

[pudding]

Another thought.......have you got uprated engine mounts?  Some really harsh ones have been known to fool the knock sensors into thinking there's detonation occurring, when there isn't.   Just throwing that out there.   Soft engine mounts do more than just make it comfy in the cabin 

[v4rley]