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HPFP or Injectors?
I'm pushing the tune on my Z4 with Dimitri. I received the following feedback from him on my last run.
"I'm going to have to reduce torque and some boost. The map is just too aggressive for the fuel or due to hardware fault
The shudder that felt like a misfire was your HPFP hitting the HPFP threshold limit. The DME pulls power when this happens.
Something is definitely up with you fueling system. Previous logs your HPFP was looking better and now its low again. So my conclusion is you are in fact loosing fuel pressure either from an Injector(s) or the HPFP is going EOL"
I'm pretty sure I have Index 9 injectors. Any suggestions on actions I can take to be more certain if the issue is the HPFP or injectors or which I should replace first?
BTW, I have been very happy with his results. He is very responsive and informative,
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