electrical and ignition Megasquirt Question

[sirius815]

So here's a wild thought - give megasquirt a trigger signal from a non-locked dizzy. My thoughts are that this should work (just adjust for the mechanical advance in the timing tables). Yes/no/maybe?

 

P.S. - yes, crank trigger would be better and yes, normally the dizzy is supposed to be locked.

[Simeon]

The problem would be repeatability of the adjustment within the timing tables. Of course this wouldn't be any worse than the mechanical advance itself but it begs the question as to why you would do this?

Dealing with the loss of accuracy through timing chain and skew gear issues is one thing, adding the variability due to spinning weights and springs is something else.

[sirius815]

Just put in DCOEs and wanted a good solution besides a Tii dizzy. I don't necessarily want to go with the crank trigger setup (yet) and I don't want to screw up the stock dizzy either.

[Simeon]

It makes more sense as a transitional stage but surely easier to get an old distributor and lock that so that you can put yours on the shelf.

[jimk]

How can it advance spark before it happens from the dizzy unless the dizzy is well advanced to begin with, then in that case it would need negative advance at idle.  Have at it and you will be the first in the world!  You will need a timing light to resync the system every whenever the signal drifts from the dizzy due to wear and tear, etc.

[TobyB]

megajolt 

 

https://www.autosportlabs.com/product/megajolte/

 

done.

 

The dizzy is one of the weakest (over decades) part of the M10.

 

t

[sirius815]

I've looked at Megajolt and the costs between going edis and going megasquirt with bosch igniter for stock coil are a wash. Besides, the wife said I can't get rid of the dizzy and stock coil. 

 

Still tinkering with the idea of a 123Tune as well.

[sirius815]

How can it advance spark before it happens from the dizzy unless the dizzy is well advanced to begin with, then in that case it would need negative advance at idle.  Have at it and you will be the first in the world!  You will need a timing light to resync the system every whenever the signal drifts from the dizzy due to wear and tear, etc.

The same way it does with a locked dizzy I presume. From what I understand, the dizzy actually send the signal one ignition ahead ("Next Cylinder") http://www.msextra.com/doc/ms1extra/Dizzy_Ignition/This_Next_5_setup.htm

[Chamonix72]

Well...I run Motronic in my E12 (E28 motor) but the stock distributor weights were welded, so all the distributor does is, well, distribute the spark. Motronic handles the timing. I believe this was done to make the car look stock for CA visual smog test.

Edited February 7, 2016 by Chamonix72

[sirius815]

Link to your setup? What are you using for timing sensing?

[Chamonix72]

I believe the stock E28 motor uses a pair of crank sensors. It also used a distributor, but it was a different style. I didn't build the car. I bought it with the motor swap already done.

[xferboy]

Besides, the wife said I can't get rid of the dizzy and stock coil.

 

Leave it there, doing nothing and use crank/EDIS