MicroSquirt.com read only forum (Jan.15,2018)

Hello,
Just spent the last god knows how long looking over everything I could think of, and now Ive come to the end of it.. thought Id post here..

Im running a MSII on a V3 board, with originally V2.5 code, but now the 2.36 code.. and MT2.25. Here goes the story
(The car is a Ford Falcon, Dizzy TFI setup)
Started my car yesterday, drove awesome! Idled awesome! it waas the best feeling.... then I switched it off, and when I went to start it again, no go.

Left it till today morning (yesterday morning I should say), after lots of playing around, I disconnected the SPOUT and got the car to run on LHO (Limp Home MODE).. I thought that was strange because it was running the day before... very well.

So I put it on the stim, and what happens is, if the trigger offset is greater than current advance+1, then there is no advance, and no signal... same for anything under it too... so hence why no start.


So for what reason might an MSII decide it doesn't want advcance?

Also, loaded new code, tried new daughterboard, tried a new TIP41C(my replacement for the VB921), tried a 2n2222A, tried boosting the input signal.... I tried alot, ALOT... Any help GREATLY appreciated!


Thanks!

Wouldn't believe it... changed the dwell from 1ms to 3ms, and it fired and advanced first go....


All is well now!

Can't believe it was so simple


Cheers

justfordima,

The TFI module needs to see a wide waveform to control the spark properly, I have dwell set to 8ms.

Basically, The Spout waveform has to be at least as wide or wider as the Coil drive waveform, or the module sends the base timing to the Coil. The TFI module will regulate the Dwell automagically based on the coil current, so the Spout dwell can be wider without coil or module overheating.

That makes complete sense... but why does the MSII documentation say set dwell to 1ms....?



Cheers

justfordima wrote:That makes complete sense... but why does the MSII documentation say set dwell to 1ms....?

Good question. The docs are wrong.

James

The TFI setup will not work at 1ms so that must be a typo. IIRC On the MS2 you can't set it up for more than 8ms unless you change the limit in the .ini file, which is not really required, 8ms is plenty to start.