Rob --

The MULTIPORT EZ EFI is NOT NEW.... it's just the ECU and the harness and required sensors and O2 etc -- about $900 complete.

There is nothing to "support" -- it will run up to a 72 # injector.... and the fuel pressure is set not only at the regulator - but also input into the "set up" function of the start up. After that - it's just going to run the A/F ratios you choose. There are 3 A/F ratios to select -- IDLE - Cruise - WOT. You set those only if you don't want to use the defaults.

You can operate whatever pump you choose... you don't have to buy theirs. I'm running an Aeromotive pump.

You do not run any dual sync distributor - or cam timing with the EZ ECU...it only controls the fueling... so you can just run a regular MSD distributor - and do your timing and timing curve as you would on a carb car...

Sounds to me like your engine builder is a little behind on the EFI curve....

And THAT is the reason for EZ-EFI!

Thanks Lance,

This is all well and good, but I guess I will find out fairly soon whether this thing can run without the regulator, dead-headed. After talking with the Comp Tech and getting nowhere and seeing Comp's video of a 572 being pulled on a dyno with no return line present, or regulator visible, something tells me I can. It is easy enough to add the return line but I am going to, at the very least, get her running first without it and see where it goes.

In your opinion, how would running this system differ from running a typical 4th gen F-body system dead-headed? I am just asking the question as I am curious.

Thanks again!
Dave

Not sure if he is behind - but I know I DEFINITELY AM! :yes: Maybe I misunderstood him on the whole "new product" thing (was driving at the time). Bottom line is, I asked him to build the 565 and use the FAST XFI system, as I have read good reviews about their system, wanted a multi-port EFI system, and thought the EZ-EFI set up was through the throttle bottle only and was limited to about 600HP. He called yesterday and said that the EZ-EFI set up can be purchased as a multi-port system and would be easier to set up and work with than the XFI, but he stated he is absolutely OK with installing and configuring the XFI system if that is what I really want. Sooooo- my question (stupid question of the month #37) is - do I really want the XFI set-up? Will it offer more flexibility down the road or is the EZ-EFI going to work just fine (on a 565cu in chevelle that will eventually see autoX and road course duty)? I just don't want to sell myself/my engine short right now because of my lack of knowledge on the subject at this time.

Thanks for dragging me up the automotive Ladder of Knowledge...

Honestly,

I think you answered your own question. The XFI is by far a more versatile system. The EZ EFI is just what its name implies....easy. For Autocross, etc...where you will be one and off the throttle constantly, making the car much more prone to lean spots, I say stick with the XFI...

I would be inclined, however, to possibly find someone who is certified in XFI tuning. If he is, then so be it, but tuning a fuel injection set-up isn't as simple as slapping a carb on there and being done with it.

Good luck either way!!! I will have results of my EZ EFI set-up soon hopefully....waiting on my tank and my front accessory drive to show up.

Dave

Dude! It's your lucky day!

You can now get the XFI WITH the EZ EFI self tuning feature built in!

That way you'll have the best of both worlds -- self tuning -- OR -- all the flexibility you want for later - or in case you want to change some particular parameter!


That's the way I'd go if it was me.

BTW --- You won't have any lean spots with EFI..... PERIOD.

I can't speak on the latest generation of ECMS, but I've spent countless hours tuning the older Fast system (not their XFI), Accel DFI Gen VI and Gen VII, and several GM pcms ... Haha, let me assure you, EFI and lean spots are not mutually exclusive! Even with widebands, getting the transient fueling dialed in can be very time consuming.

That -- ie., the lean spot(s) is NOT an EFI issue... it's a TUNING issue and or a fueling issue that is physical ie., inadequate sump/fuel aeration/improper pump size etc - which of course, you can't "tune out".

Tuning for either rich or lean (spots) is super super simple. Run your data logger... you set the parameters that you want to see (VE / A:F / O2 / etc)- make your "run" and then review the data and tune accordingly. If you're spending hours and hours then I'm sorry... 'cause it ain't the EFI causing the problem. There is no fuel slosh - no floats - etc in the ECU or the injectors, and the pump should be adequately sized for the BSFC demands of the engine/use.

Some times when playing golf - a buddy will hit an errant shot... to which I will say "Wow! You've got a lot of LOFT!"... they usually have a quizzical look on their faces -- then I say "LOFT... a Lack of F----------g talent".

I think what Eddie was referring to was how much time it can take to tune the transient areas of an EFI system that's not a self-tuning one. I know there's several tables involved on many of these systems, and adjusting one will affect others. There's been many times when I chase my tail for a while before I finally get rid of a small area that's been giving me fits.

You are correct Greg, it is a tuning issue, but one that can be quite tricky with certain combos and systems.

Jody