Neither one of my 8 stack motors run a vacuum referenced fuel regulator.... and both run EZ EFI.

I've installed two EzEfi systems, one normal kit with the throttle body &'one retrofit kit that replaced a FAST Classic ECU & harness. This system ran 8 injectors & used the existing fuel pump & throttle body. On this system I installed an MSD 6AL2 programable unit & added a second MAP sensor. It all worked great. With an 8 injector system you can supply enough fuel for more horsepower. At SEMA they had a similar system mocked up & when I asked for the part number, they said they didn't have one for it yet, but it was made of parts they already sell.
I used the MSD 6AL2 to retain the locked distributor already in the engine. The XFI would probably have been a better choice as it would have run the ignition & I hear it can self - tune the same as the EzEfi if desired.
David

I'm doing one on Charley's 494 cid Cammer motor with two throttle bodies. No vacuum reference, rear mounted bypass. I am tricking the computer to get it up and running, the base map it builds with the correct cubic inches and fuel pressure is a mile off. Won't even run on 8 cylinders to get to the 140 degrees it needs to start adjusting the tune, and keeps killing plugs.

Looks like it'll work, but in the case of a 13:1 700+ HP solid roller Cammer Ford the XFI would have been a much better choice............. :yes: They say it'll support big power with the two 4-barrel throttle bodies, but then they give you a small 190 LPH pump which I don't think supports their claims. Believe that pump is only good for 450 hp or so, 500 max.

David -- They have you "fooled" too... chalk another one up to "marketing".
The FAST XFI 2.0 WILL NOT self tune.... not like they've led consumers to believe. It WILL smooth out / correct the VE table... as long as the table is "close" to being correct.

It's not like the EZ EFI where you just answer some simple questions - fire up the motor and have it tune itself without any further input.

The FAST EZ EFI MULTIPORT system is part number 302000 and sells for around $850

You probably need to recalibrate the Turbulator.....

I should have thought of that............. :lol:

What fuel pressure did you set at the regulator?

45#'s

I have a EZ EFI question for you guys. I know they say 500 horsepower is the max for the setup, but I have heard others using this at 600 hp or so.

I have a 1967 Ford Mustang Fastback. I have a Keith Craft 427 pushing 510 hp and set up for a blower. I have a Paxton supercharger for it and figure it will boost it up to around 675 hp or so.

Can I run the EZ still or would I need to step up to the more costly XFI setup? Thanks in advance!

The answer is 2 fold. Yes the EZ-EFI system will support just north of 600hp. However, the EZ-EFI system will not at this time support forced induction. You would have to step up to the xfi. The good news is they have upgraded the xfi with a portion of the system from the EZ-Efi. I am told it doesn't completely tune itself but does help populate tables on it's own. I hope this helps. :thumbsup: