I've got some wierdness I'm trying to track down in the charger, and wanted to see if anyone here had any suggestions... Basically, the car is on a megasquirt V3 board, running MSnS-E 29q2, input direct from a locked MSD distributor VR sensor into the V3 board VR circuit. The output is driving an MSD-6A box with the circuit from the MSnS-E page. I've got the car actually running pretty well, but it has about 5* either way jitter in the timing. I've got the input trigger at 5*, If I set fixed angle output at 15*, it will jitter between 10* and 20*. RPM doesn't seem to make much difference. I know the distributor isn't the problem, because if I feed the 6A box the direct distributor VR signal, it is DEAD on (I can't see any jitter at all). Also, the tach signal seems very clean; it doesn't show any RPM spikes or wierdness...
Any idea what could cause this? I'm guessing maybe it's something in the VR circuit, but I don't understand how it could be inconsistent, but still hit every single time, you know?
Also, I know the polarity is correct because when I connect to the 6A box through the MSD harness (the harness is polarized), it fires at exactly 5*, as expected.
Timing jitter... ... ?
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- Helpful MS/Extra'er
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Timing jitter... ... ?
The years-long project: http://www.msefi.com/viewtopic.php?t=3043
Other info (stereo, interior, etc):
http://www.sounddomain.com/ride/2324498
Other info (stereo, interior, etc):
http://www.sounddomain.com/ride/2324498
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- Helpful MS/Extra'er
- Posts: 144
- Joined: Thu Aug 12, 2004 7:48 pm
- Location: Little Rock, AR
- Contact:
Any ideas? I'm still searching periodically, but haven't found anything
The years-long project: http://www.msefi.com/viewtopic.php?t=3043
Other info (stereo, interior, etc):
http://www.sounddomain.com/ride/2324498
Other info (stereo, interior, etc):
http://www.sounddomain.com/ride/2324498
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- Site Admin
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