Hello, i got problems with drifting ignition.
Engine Mercedes m102, ms2 via stock dizzy, vr as input. When i set fixed angle to 10 degree, with strobe light it is at idle correct, when i rev it up tp 2000 rpm it drifts on advanced side for about 10 degree, as higer revs i got higer drift. Stock mercedes coil, dwell 3ms, locked distributor. dwell changes does nothing, spark duration the same. attached msq, tooth logger and log.
Timing drift
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Timing drift
Last edited by Marissp on Sat Jul 15, 2017 12:55 am, edited 2 times in total.
Re: Timing drift
Maybe switch ignition capture to rising edge and retime? (Also verify rotor phasing)
I read somewhere that the falling edge can be lazy.
I read somewhere that the falling edge can be lazy.
Correctly identify your MS ecu here
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Read the Do's and Don'ts to avoid the common pitfalls before starting your install or asking for help
Use only these manuals other manuals may cause brain damage or worse.
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elutionsdesign
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Re: Timing drift
Flip the + and - on the VR.
Graduate of EFI University.
I build, repair, install and tune Megasquirt systems in North Dakota and beyond!
I build, repair, install and tune Megasquirt systems in North Dakota and beyond!
Re: Timing drift
I tried rising edge but car does not start. If i try rising edge will that is the same as change polarity to vr sensor?
Rotor phasing is like in manual 25 degree btdc, trigger angle about 60 degree. Ok i will try to change polarity. Bouth vr pots is fully counter clockwise. Adjusting pots just make a bigger drift.
Rotor phasing is like in manual 25 degree btdc, trigger angle about 60 degree. Ok i will try to change polarity. Bouth vr pots is fully counter clockwise. Adjusting pots just make a bigger drift.
Re: Timing drift
Tried to change polarity, still happening the same timing drift, adjusting pots make timing drift worse. Is anything i can do without oscilloscope?
I use LM2904 in vr circuit.
I use LM2904 in vr circuit.
Re: Timing drift
Ok so i cant find the cause of problem so switched to 36-1 trigger wheel and bmw vr sensor, now everything is ok.