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question on fuel injection

Posted By: cudaman1969

question on fuel injection - 11/20/11 07:13 AM

since i can't get any response on my other post i'll break it down into smaller questions.do they make an electronic fuel injection control just to control the fuel and not the spark or is it tied together in some way? been reading some other posts and they all seem too do both.
Posted By: CW25

Re: question on fuel injection - 11/20/11 07:35 AM

You can run a old school dist and just run hte fuel side of most EFI systems. Not sure why you would want to do this but it is doable. I personally like to change the timing with just a few clicks of then mouse but I suppose a timing light and wrench works as well.
Posted By: gdonovan

Re: question on fuel injection - 11/20/11 01:08 PM

Quote:

since i can't get any response on my other post i'll break it down into smaller questions.do they make an electronic fuel injection control just to control the fuel and not the spark or is it tied together in some way? been reading some other posts and they all seem too do both.



Megasquirt will go either way.
Posted By: Mopar_Rich

Re: question on fuel injection - 11/20/11 05:07 PM

EZ-EFI only controls fuel, and as was said, any other EFI system can ignore ignition timing if you want. But if the system can control timing I would use it. It's interesting to see the affect that timing has on mid-range torque that most people never knew was there.
Posted By: cudaman1969

Re: question on fuel injection - 11/20/11 11:12 PM

EZ-EFI only controls fuel, and as was said, any other EFI system can ignore ignition timing if you want. But if the system can control timing I would use it. It's interesting to see the affect that timing has on mid-range torque that most people never knew was there.

next question,i would like using my MSD 7 with one coil,this has a lot of fire power and multiple sparks per cycle, can these systems keep up with it?
Posted By: turbobitt

Re: question on fuel injection - 11/20/11 11:47 PM

Quote:

EZ-EFI only controls fuel, and as was said, any other EFI system can ignore ignition timing if you want. But if the system can control timing I would use it. It's interesting to see the affect that timing has on mid-range torque that most people never knew was there.

next question,i would like using my MSD 7 with one coil,this has a lot of fire power and multiple sparks per cycle, can these systems keep up with it?



I know the FAST XFI has inputs for just about any type of trigger, Crank or distributer. The XFI would then trigger the MSD though a "points" wire output. Now you have your MSD ignition but timing control through XFI.
Allan G.
Posted By: Mopar_Rich

Re: question on fuel injection - 11/21/11 01:28 AM

Quote:

next question,i would like using my MSD 7 with one coil,this has a lot of fire power and multiple sparks per cycle, can these systems keep up with it?



Absolutely. The XFI just drives the white wire as was said. I have set up quite a few MSD 7 systems with the XFI. The only consideration is to make sure the MSD is well separated from the XFI because of the electrical noise the MSD creates.

You would not use the spark retard or any of the other features in the MSD. The XFI handles all those, including rev limiters, but you can use the MSD rev limiters if you want.
Posted By: furious70

Re: question on fuel injection - 11/21/11 05:24 PM

x2 on going all the way and having the ecu do the timing too, it's so simple to do and gives so much control. I'd love to have the spark only side for carb'd vehicles!
Posted By: FastmOp

Re: question on fuel injection - 11/21/11 06:06 PM

I'm hooking a MSD 7531 to a XFI now. I could use a few tips. I have the FAST close to done and was getting stuff layd out for the MSD. I really want to add a racepak as well.

Rich it's David in KY. Still not running but getting close lol
Posted By: feets

Re: question on fuel injection - 11/22/11 02:13 AM

I run an old Electromotive TEC II with distributorless ignition. You can see it on the firewall in this pic.



It was a pretty advanced system for it's day. The biggest problem I had was the lack of support for it. Very few people know how to tune it. Unlike the EZ-EFI systems, these are compatible with up to 3 bar MAP sensors (30 psi manifold boost).

The TEC 3r is a more modern replacement. I haven't looked at the software for it so I can't comment on how it works.

www.getfuelinjected.com
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