Fuel/Ignition computers

[merc-blue]

I was talking to a mate about ECUs the other day, and i became curious if you can hav a seperate unit fo ignition and fuel, eg have a Crane cams dizzy, booster and ignition and then have a microtech LT4 doing the fuel,
reason is he is running a L20 on webbers with lots spent on his ignition and is considering rolling up a plenum and going EFI and doesnt want to lose all the money on his ignition

Ideas?
Cheers
Rohan

[oldcorollas]

megasquirt....

just because you have dizzy, booster etc, doesn't mean you can't have the ECU fine tune the spark advance....

you can either lock the dizzy advance.. or leave it as is, then get the ECU to effectively retard/advance the spark to the correct position...

perhaps he could get injector bungs put into the manifold, run the webbers dry and have quads and EFI.. ftw!

[merc-blue]

Thanks mate I will suggest that to him,
I cant see him using the carbies as throttle bodies, im pretty sure he would sell them, to recover costs

[oldcorollas]

ahh... get rooted ones or solexes for the TB's then, and take out the chokes

ITB and EFI ftw!! best of both worlds.

[merc-blue]

you have a real ITB fetish, dont you?

[thechuckster]

fwiw, there's a datto 1800 with an L20 setup for street rally/motorkhana in BNE that owner has converted to EFI but retained the carbis .. if he has issues with the EFI on the road he can swap over some pump hardware, hookup the fuel bar to the carbis and continue to drive.

Stu's fetish about ITB is because they sound extremely hOrn at full noise

[mrshin]

Buy a proper ECU, and use it for ignition. No matter how much he's 'spent' on his ignition, he'll still improve things with mapped ignition vs. mechanical advance - I presume he's not running a magneto from a top fuel car (I don't condone those for any reason of sophistication, only because they produce such a DAMNED BIG SPARK)

[merc-blue]

Thanks for the help guys i had a chat to him last night and i think he might go down the megasquirt route (cheapness) and we do abit of EFI tuning (mostly with autronic though) so he recons we can get it good, or atleast know people who can help,
i have been reading up on it and the software looks quite user freindly and there are so many people who are working with it that its developing very quickly