So wheres the datalogs?? Nobody will be able to help without datalogging
N75 will be sporadic, it will never be static as it responds to a load based request from the ECU. Numbers can be quite high, especially at higher RPM as the K03 usually runs flat out on more aggressive maps, not helped by the weak standard actuator
If the boost is up and down like a yo-yo, and I presume the N75 follows suit, have you checked the requested and actual load, and whether the TB is closing etc.? Also checked fuel pressures (low and high sides), fuel trims, lambda etc.
K03 means at most its a stage 2+ map. Have a read of R-Techs website.
The engine should idle and run fine with the MAF unplugged electronically, it should only stall and cut out if you remove the MAF from the intake with the engine still running (having undone the 2 screws) and with the electrical connector still plugged in
Have the issues literally just started in the last few days, or started after changing certain hardware and continued to deteriorate from there?
If time is that much of an issue, don't waste it and get it booked in with a local specialist, or get someone local to take a look, run some VCDS logs etc.
It won't like the MAF being pulled one bit, unless it's fecked and already substituting it's function with another sensor. As your engine died, it's a good sign the ECU was happy with it's signals.
I would go out for a spin and data log the requested and actual boost pressure measuring blocks. The erratic N75 behaviour sounds like it's struggling to maintain the target boost, whether that's from a boost leak or some other hardware issue, who knows but at least you will get a picture of how far off the boost is. Hugely off means a significant hardware fault which shouldn't be too hard to trace. Ignore any transient peaks as the N75 takes time to react and smooth the boost out.
The N75 actuation isn't usually huge numbers anyway, unless the map calls for a spikey delivery.
Okay so the logging was done spur of the moment. Nothing to show you guys. Sorry.
Yes I removed the whole MAF from the intake. Then turned ignition on. Car started and died right away. No drama there.
The boost isn't hugely off, so I figure it's not a big hardware issue, but it is off. So potentially leak somewhere or N75 valve is what I've been told.
Do you recommend upgrading the actuator?
The map I have has no torque spikes, it's very linear as previous plots have shown.
Throttle body function is perfect, fuel trims good, lambda all good. The issues have started in the last week or so, but gradually become worse. The boost issue is also intermittent. Yesterday it was all over the place, today it seemed perfect.
I read R-Tech website, yes it's Stage 2+, I don't really go much on what's what or what x and y is etc. I just know how I want the car to feel. I've been told what is possible with the set up I have and tbh being told 'you could achieve 300bhp/350lbft' means very little to me, I just want the best map and best delivery I can get from a map and R-Tech were top of the pile.
Thanks for your time and help lads!
