Fast efi
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
I'm not bashing the Fast system at all but mine has been a problem. I have the 2.0 on my Cobra. Easy install but it just has never run at low rpm correctly and now it is loading up so bad the car stalls. Plugs are black and it is running pig rich.
I have run a few injection systems on different cars and this by far has been the most troublesome. I have run a Massflo, Fitech, older Holley system and a slightly modded LS3 and now an LS7 injection so I'm not a rookie at this. Let me know how your system runs after about 100 miles of learning. Mine ran great for about 1K miles.
I have run a few injection systems on different cars and this by far has been the most troublesome. I have run a Massflo, Fitech, older Holley system and a slightly modded LS3 and now an LS7 injection so I'm not a rookie at this. Let me know how your system runs after about 100 miles of learning. Mine ran great for about 1K miles.
Thread Starter
Drifting
Joined: Sep 2007
Posts: 1,572
Likes: 51
From: Wichita Kansas
I'm not bashing the Fast system at all but mine has been a problem. I have the 2.0 on my Cobra. Easy install but it just has never run at low rpm correctly and now it is loading up so bad the car stalls. Plugs are black and it is running pig rich.
I have run a few injection systems on different cars and this by far has been the most troublesome. I have run a Massflo, Fitech, older Holley system and a slightly modded LS3 and now an LS7 injection so I'm not a rookie at this. Let me know how your system runs after about 100 miles of learning. Mine ran great for about 1K miles.
I have run a few injection systems on different cars and this by far has been the most troublesome. I have run a Massflo, Fitech, older Holley system and a slightly modded LS3 and now an LS7 injection so I'm not a rookie at this. Let me know how your system runs after about 100 miles of learning. Mine ran great for about 1K miles.
Le Mans Master
Joined: Jan 2001
Posts: 6,746
Likes: 1,387
Is it EZ-EFI 2.0?
I am running EZ-EFI 2.0 to control my RamJet 350 with a locked MSD Distributor.
I have the ECU under the passenger side dash. Make sure you run good grounds and wire it as directed by the instructions. My MSD box is in the engine compartment under the passenger side fender side. Minimize the control leads that run next to the spark plug leads otherwise you may end up with the multiple troublesome IRM codes.
I am running EZ-EFI 2.0 to control my RamJet 350 with a locked MSD Distributor.
I have the ECU under the passenger side dash. Make sure you run good grounds and wire it as directed by the instructions. My MSD box is in the engine compartment under the passenger side fender side. Minimize the control leads that run next to the spark plug leads otherwise you may end up with the multiple troublesome IRM codes.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
The Cobra is a very small car. I-have the ECM is behind the passenger seat and the wires are away from everything. My MSD box is behind the dash away from most everything. Ground wires. Ihave run an extra few of them. Yes it is the 2.0 system which. I was lead to believe was a better system. Fast tech support is terrible at best. Just google it and. I-have tried multiple times to get assistance to no avail. I have locked out my MSD dist and it has been timed a number of times perfectly. I’m kind of at my wits end. Nobody wants to seem to take on a system that is having problems and need tech support, just pass it on to the next guy.
Race Director
Joined: Jun 2000
Posts: 10,049
Likes: 675
From: FL
I have heard that the EZ-EFI is picky. I have XFI 2.0 and it runs pretty good. Getting it tuned was a pain though. Very few tuners seem to do FAST. Holley is better supported. If I was going it again, I would probably go Holley just for the USB interface. The FASXT XFI uses a USB to serial adapter and I only have one old computer that will run the software. Very frustrating.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Direct grounding of the computer to the battery is important. Any 'junk' in the electric lines can cause computer problems; it's not as simple as just hooking up a light or motor to 12 vdc.
If the computer ground is just connected to 'frame metal', that could be your problem.
If the computer ground is just connected to 'frame metal', that could be your problem.
