Sync loss?

[gloom15]

I'm running MS1 Extra PCB v3.0 temporary on my Mazda Rx-7 and noticed one thing - sometimes missing teeth is in wrong time in tooth logger, so I want to ask - is it critically for engine health, on ms2-3 when I get missing teeth on wrong time, engine stalls for a moment, then synchronizing again, that's fail safe, what will do ms1 when it saw missing tooth in wrong time? Will it try to calculate timing in that situation and may it give spark in wrong time and engine can die due to detonation? If yes, how I can understand, is there sync losses on high revs, except saw it in tooth logger?

[jsmcortina]

MS1 cannot detect synch-loss in the same way as MS2 and MS3. Undefined things may happen.

James

[Matt Cramer]

And my experience has been that these undefined things are typically a spark at a completely random time.

[jsmcortina]

And my experience has been that these undefined things are typically a spark at a completely random time.

Another good reason to use a current product.

James

[gloom15]

As I thought... So there is another question - I'm using 12V hall sensor, on microsquirt board it works fine using OPTOIN (don't ask why I don't use VRin, long story ), no sync loss at all, on MS1 V3.0 board there is some missing tooth in wrong time, I'm also using OPTOIN... I compared schems of microsquirt and my V3.0 board - on my board there is no C30 and C12 capacitors (Dave and Ed) and jumpers in place of D1 and D2... on microsquirt there is C27 Dave and C28 Ed capacitors and D4 STPS2150A. Also I noticed that on V3.0 board there is R12 390 Ohm and on microsquirt board there is R20 680 Ohm... So question - if I will install C30, C12 and on of D1-D2 diode and change R12 resistance to 680 Ohm can it help with sync loss?

[gloom15]

installed D1, C12, C30 - "sync loss" still here. But I will upgrade to MS3 daughterboard, I think there will be no sync loss

[DaveEFI]

As I thought... So there is another question - I'm using 12V hall sensor, on microsquirt board it works fine using OPTOIN (don't ask why I don't use VRin, long story ), no sync loss at all, on MS1 V3.0 board there is some missing tooth in wrong time, I'm also using OPTOIN... I compared schems of microsquirt and my V3.0 board - on my board there is no C30 and C12 capacitors (Dave and Ed) and jumpers in place of D1 and D2... on microsquirt there is C27 Dave and C28 Ed capacitors and D4 STPS2150A. Also I noticed that on V3.0 board there is R12 390 Ohm and on microsquirt board there is R20 680 Ohm... So question - if I will install C30, C12 and on of D1-D2 diode and change R12 resistance to 680 Ohm can it help with sync loss?

It's one of those things where a scope would help. To see exactly what the waveform the processor was getting from the opto-coupler, and the waveform into it. There's no reason why it shouldn't work perfectly. But of course later software allows you to do a trigger log, which should show any problems.