problem at high rpm Miata na m45 supercharger
#1
problem at high rpm Miata na m45 supercharger
hello everyone.I have a miata 1.6 NA with M45 mercedes supercharger, intercooler and speeduino ECU. the car is fine but I have problems above 6000 rpm. sometimes he stumbles and from the logs I see that he goes lean. I have a duty cycle of the injectors even at 92%, could they be small injectors? I run with stocks. I run at nearly 6 psi of compressor pressure.
I am attaching a log, so maybe someone can check if they have time ..
Thanks in advance for the advice!
I am attaching a log, so maybe someone can check if they have time ..
Thanks in advance for the advice!
#3
Retired Mech Design Engr
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Welcome to the forum. I will give some generic comments, and a little bit based on your provided logs.
Sounds like mis-fire. Likely spark blowout. If engine misses, then the O2 sensor will see excess O2 and will report lean.
Just before that happens (either lower RPM, or Lower pressure), what is AFR?
You may wish to post your tune as well.
I presume you are running (2) injection pulses per revolution, since 8mS is 90% duty cycle.
DNM
Sounds like mis-fire. Likely spark blowout. If engine misses, then the O2 sensor will see excess O2 and will report lean.
Just before that happens (either lower RPM, or Lower pressure), what is AFR?
You may wish to post your tune as well.
I presume you are running (2) injection pulses per revolution, since 8mS is 90% duty cycle.
DNM
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