Thoughts on the FAST Ez-EFI system??

[GregWeld]

Originally Posted by eddiep

Greg,

I've been to the dyno a few times over the years, but 99.9% is done on the street or at the track, laptop on the passenger seat. Best case scenario is a buddy manning the laptop so I don't pass as a drunk driver.

My last car had the original Fast "classic" ECU, which was actually sold by Speed Pro at the time, and my current car is an older Accel Gen 7 that’s upgraded to the 5.5 firmware (sounds like you are familiar with the system). Both systems have widebands and you can get the car driving really well in no time. Maybe I'm a perfectionist, but I've found you can get 95% of the way there in the first hour or so [with the wideband system] where there is no discernable driveability issues ... That last 5% of tweaking takes quite a bit of time, at least for me.

First aftermarket ECU I retrofitted was a Haltech F3 into an early 3rd gen Camaro, back when it was far more popular to take off FI for a carb than vice versa!

I agree completely.... after the dyno -- it takes lots of seat time! Cold start... is always an issue... getting it to fire on the first revolution (just like a brand new car)... and on and on.

I think that is why I've fallen in love with the FAST EZ EFI... it just works... and seems to get better with each drive... and all I've had to do is DRIVE... it's like gettin' laid by the cheer squad! So easy... and FUN!

[Sieg]

Originally Posted by GregWeld

TOUCHE!!




But it WAS right after a fresh EFI install!!

So did I run it out of gas --- or was it that dang EFI?

Sorry, couldn't resist that op!

[BanditDave]

Hey Guys,

Question on where you guys hooked up your MAP input for your MSD box (ASSuming you are using this on an LS app)? Did you guys T off the EZ EFI's MAP or did you install another sensor in the intake.

I know this may seem counter-intuitive to use on an LS but I have a specific reason.

Open to your thoughts. Judging by what most are using it on, it would appear they are using distributor'd engines and controlling just fuel with this set-up.

Thanks,
Dave

[g356gear]

So is this system MAP or MAf based?? I am assuming there is no timing control...just fuel control based on O2 sensor feedback.

[shaun8541]

Does anyone know if the EZ EFI will handle more than 500 hp? I have 510hp naturally aspirated on my SBF 427 and I want to add a Paxton Supercharger. Paxton says up to a 30% gain in hp over stock. Would the easy work or would I need to step up to the XFI and all the tuning costs etc?

[GregWeld]

Originally Posted by g356gear

So is this system MAP or MAf based?? I am assuming there is no timing control...just fuel control based on O2 sensor feedback.

MAP based... and you are correct. The EZ EFI builds a VE table based on your input of cubic inches and nozzle size - fuel pressure etc... and then self corrects that table with driving and using the readings it gets from the O2. There is NO timing control. Super simple - super effective system.

[GregWeld]

Originally Posted by shaun8541

Does anyone know if the EZ EFI will handle more than 500 hp? I have 510hp naturally aspirated on my SBF 427 and I want to add a Paxton Supercharger. Paxton says up to a 30% gain in hp over stock. Would the easy work or would I need to step up to the XFI and all the tuning costs etc?

Personally I'd choose an XFI system once you go beyond N/A. You're going to need effective control of your timing etc and the EZ EFI will not do that.

[shaun8541]

Originally Posted by GregWeld

Personally I'd choose an XFI system once you go beyond N/A. You're going to need effective control of your timing etc and the EZ EFI will not do that.

XFI it is. Thanks Greg!

[captainofiron]

After reading this, I am definitely going with the EZ for my 68

I had always been a little nervous about getting the XFI, because of the tuning, and lack of laptop access

but now that I have read so many good things, Im sold

[garymac69]

Originally Posted by camcojb

I have run rear-bypassed systems with and without a vacuum reference to the regulator. Both ways worked fine for me. With a forced induction setup I like the reference line so I can get additional fuel pressure under boost.

I think you're fine running without it, and just having a static (unchanging) fuel pressure.

Jody

Has anyone gone with a rear-bypassed fuel system and does the system work well with the EZ-EFI? Did you run a vacuum line back to the regulator?

The fuel system issue is the main reason I have not jumped into the EFI arena.

Gary