Sync error on pretty vanilla ms2-e install

the poi · Post by **the poi** » Mon Jan 07, 2008 3:56 pm

I don't know what's with me and sync errors....I upgraded from a working msns-e 029v install to ms2-e b18. I didn't re-wire my input trigger, so I'm using falling trigger instead of rising. It's a 60-2 wheel, and was running on the msns-e install with first trigger as tooth 6, return tooth 15 (6* cranking advance), with a trigger angle of 60*. So for ms2, trigger angle was set to 0, and first tooth was set to 96*. Something weird is happening with the sync while cranking, see the datalog attached. It's giving an odd repeating RPM pattern. In other words, it can't keep the sync, but it's seeing something. Is there a raw trigger table that I can look at like in msns-e? I never had an issue running msns-e all the way up to 7200rpm, so I don't think it's a hardware problem unless I'm missing something with how ms2 is reading teeth. Any tips?

edit:// sorry: 6 cylinder with wasted spark, LEDs output circuits driving OEM 3channel ignition modules, in pairs.

Post by **muythaibxr** » Mon Jan 07, 2008 4:36 pm

Did you reboot the ms2 after changing your ignition settings?

Ken

the poi · Post by **the poi** » Mon Jan 07, 2008 5:04 pm

muythaibxr wrote:Did you reboot the ms2 after changing your ignition settings?

Ken

Yup. Is there any real functional difference between vroutinv+falling and vrout+rising?

Post by **muythaibxr** » Tue Jan 08, 2008 7:57 am

According to Bruce the pots on the V3 board only work correctly if you use vrout, use rising edge, and wire the VR sensor backwards from what the factory did.

Ken

the poi · Post by **the poi** » Tue Jan 08, 2008 8:37 am

Hmm, that's interesting. I'll switch it over then, and see if I make any progress.

6040solder · Post by **6040solder** » Tue Jan 08, 2008 8:42 am

Any explanation from Bruce as to why that is Ken?

Post by **muythaibxr** » Tue Jan 08, 2008 9:44 am

I think he said the circuits were designed to act on the signal as it rises through 0v not as it falls through 0v.

Ken

6040solder · Post by **6040solder** » Tue Jan 08, 2008 10:01 am

Ok, so provided that the sensor polarity is correct for the circuit it doesn't matter whether you use rising or falling so long as the other signal is the same and the setting is correct. Thats how i thought it worked. I thought you were saying that you could only use vrout, and never vrinv for some reason.

Post by **muythaibxr** » Tue Jan 08, 2008 12:38 pm

Nope, just saying that the pots don't work right with vroutinv and the sensor wired "correctly" (per factory) in most cases because wired that way, the tooth is directly under the sensor at the + to - zero crossing. The circuit was meant to work on the - to + zero crossing.

Ken

6040solder · Post by **6040solder** » Tue Jan 08, 2008 1:44 pm

Ok, so when i say correct i mean per the v3 design, and you mean per the oem wiring :-) gotcha.

the poi · Post by **the poi** » Fri Jan 11, 2008 8:14 pm

Switching the vrout and setting the trigger direction correctly fixed it! Starts up much easier than it did on ms1, makes me wonder if was having sync issues during cranking on the old hardware...

now i need to figure out why my fan control output is refusing to operate