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I've never purchased the Jacobs unit or used it.
I have used a few of the MSD units: 6A and 6AL.
There are a few ways of getting better ignition:

1) More accuracy. Better resolution on whatever triggers the ignition. Something directly tied to the crank is usually better than a gear drive distributor, as the distributor has some level of slack and free play.
2) Bigger spark. Bigger spark allows more gap, which may burn fuel better.
3) More sparks. Multiple sparks discharged in a single ignition event.

I believe the Jacobs unit uses #2 and #3 above.

A EDIS is more accurate. I'd guess it also has a better spark as the electronics are more modern (but I have no factual confirmation).

To use one EDIS, you need to be able to mount a crank trigger. Is is a "gear" looking thing that goes on the end of your harmonic balancer. It can be welded on - or bolted on if you get creative enough. It's got to be very well centered, however.



You need to be able to mount a sensor within a few mm of this wheel.

To run the stock tach, you need a "signal" adapter. I believe megasquirt has a 5v square wave "tach output" - this signal needs to be conditioned into something the OEM tach understands. Basically you buy the adapter and wire it between megasquirt and your stock tach input. Jeff uses something like this for his FAST system.


If you're looking for a multiple-spark & hot coil system, you can use the MSD units with the stock ignition system.. Again, controlled by megasquirt. I'll let you do your megasquirt homework on the Jacobs system.. I've seen references to it.

There is probably a little bit of power in a better/hotter spark. There is also a bit of power in a properly adjusted timing curve.

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Yea I'm gonna have to do a lot more research. I contacted the guy who did the MS on a 3vzfe. I'll bet I can use his maps as my starting point if I do go MS.

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(aka suprathepeg, aka Sean)
89 v6 SWB truck "BLACK BEAUTY" EB valves, P&P head 30 over.
95 FZJ80. Lifted. locked and rollin on 33s (my dream machine)

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