Autosport Labs

Hi

I am in the middle of installing megajolt to my short strok mini A series engine. I have now read on ebay that the edis gets troubled when you are above 9000 rpm. is this true? what happens then?is it possible to avoid this problem? also is it possible or necesary to have more than 10 grids in the software since I have such a wide powerband?

Thanks in advance!

André Saethern

I can't comment about the EDIS rev limit, but I can say that the 10 rpm bins is pretty fixed. I'd be surprised if that's much of a limit as you can configure the rpm of each bin. This means that they can be closely spaced where it makes a difference, and widely spaced where it doesn't matter. Quite frankly, optimising the whole map takes long enough as it is.

thanks for a quick answere. does the megajolt interpolate between my steps? or does it step between them steps?

Interpolates, which gives you more gitty'ap. I remember when I showed interpolating version of firmware into mine, difference was night and day.

If you don't mind me asking, what displacement, block, crank and flywheel is your racer using? What rpm are you wanting to run? I am not sure where the rpm limit comes from. There are aftermarket EDIS coils if the coil is the problem such as the Accel Ford Super EDIS Coil.

Hi im using a std allegro block decked 7 mm, and bored to 73,5 mm. EN16T SA1071 crank, and an UL flywheel from minispares. the stroke and bore makes the engine be an 1191 cc pretty special. it may come up to 10k rpm sometimes but not regulary, this is why Im asking. is the coil the limit? if you change for a better EDIS coil is it possible to go past or to 10k rpm?

anyone know?

Thanks
André

no one knows about what part of the EDIS system that gives trouble at high RPM? will it help with an uprated coil for example? or is the EDIS "brain" that gives up at 9000?

I have done some research and found this: "I think the limiting factor would probably be the coil pack or drive transistors". is it possible du change the transistors easily?

I don't know what's actually inside the EDIS (note to self: must take one apart one day and see what's inside!) but
a) I bet you can't change the transistors - they're probably all potted up
b) What would you propose changing them to?
c) I don't think they'd be a limiting factor anyway - sparks at the equivalent of 9000rpm still aren't that often and all the transistors are doing is acting as switches

I'm guessing that there's some sort of digital processor in an EDIS (it produces and responds to square waves and is happy with a +5V incoming SAW signal) and guessing again that in the early 80's there was a limit in processing power - which is why, maybe, the OE EDIS ignition system has two processors (the EDIS and the EEC-IV) - so maybe it just can't process any faster.

But I'm guessing!

Anyway - I'd carry on installing and give it a go. Maybe you'll be lucky and not have a problem anyway!

Hi

I have no plans letting it go, I will try and are likely not able to reach more than 9300 rpm. so guess it wont be a problem. Ive also found this: "the senor and spark timing are handled by an HC11 microcontroller" this is supposed to be quick isnt it?

Mustang racers in the US have used EDIS-8 for ignition system on 4.6 MOD engines to over 9000, without missing a beat. So guessing that Ford used the same components inside the -4 modules, I would say 4 cylinder engines covered. Nothing like finding out for yourself, though.

thanks, good info! what will happen if it does give up really?works like a rew limiter?

there are some techincal info about the internals of the EDIS module here: http://www.dainst.com/info/edis/edis.html

Well found! Bookmarked for future reference...thanks!