83 280zx edis ???

[neorazz]

ok so is it absolutely nesscary to put the 36-1 trigger and vr sensor on ?

 

shouldn't it be possible to get that information from the wiring in the distributor send that info to megasquirt and then send the correct pulse to the edis module simulating the vr sensor ?

 

or has none tried it that way . or do i have to much information and not enough intelegence ?(smart enough to be dangerous)

[Matt Cramer]

Well, the trouble is that the distributor's signal is meant for a distributor type ignition. It just tells the ECU that a cylinder is ready to fire, but it doesn't tell the ECU which cylinder that is. Instead, the ECU triggers the coil and relies on the distributor to route the spark to the appropriate cylinder.

 

Now, there are a few setups that use the Megasquirt to drive the coils in a distributorless ignition directly with no EDIS hardware at all, but again, they'd need a different trigger than what is in the stock distributor.

[z-ya]

The real problem is that the EDIS module requires one pulse per crank angle (minus 1 for TDC). So it is a 36-1 wheel. The 83 ZX distributor puts out 6 pulses per distributor shaft revolution. Also, the EDIS module is expecting a VR sensor input signal, not a +12V square wave as the 83 distributor outputs. So this pretty much eliminates using the 83 distributor to drive the input of the EDIS module (at least without major modifications).

 

You can use the distributor as an input trigger to the MS, and then setup the MS for direct fire. You will use up two spare outputs to drive the additional coil ignitors. You can use VB921 coil drivers, or coild backs that have the driver built in.