Quote:
Originally Posted by Revved
I've had that conversation with David Page and Kevin Winstead even though they both agreed that there should be a "Tuner Backdoor" for guys that know what they are doing the Management at FAST has determined that they want the system sealed. I've done 3 EZ EFI systems- one on a common plenum manifold and two on direct runner manifolds. The common plenum engine was a caddy 500ci big block, it tuned out just fine and is a great driver. The other two with direct runner intakes were stroker small block Windsors and they were finicky.
The first one I did was soon after EZ EFI came out and actually cost me future business with the client. The system would develop a flat spot on moderate accel like briskly getting on the highway. FAST didn't have any ideas of what could cause it- I would clear out the program and it would go away for a while then tune itself back in. The client didn't want to wait for me to figure out what was wrong so I shipped him the car and of course it became a big issue.
The second one just develops random stumbles. The owner has just accepted it as part of driving a "race car" on the street but short of replacing the system I don't have any other options.
I've gone back to putting sequential XFI systems on everything. Direct runner intakes are tricky to properly tune unless you have experience with them. I have not yet seen a self-tuning system is smart enough to work out the necessary compromises that make it driveable in the real world.
Mark and I had a conversation about this a couple years back... It is easy for him to bash the FAST systems because he has seen a lot of badly installed and tuned systems... I've seen the same but I've also seen what they can do when they are set up properly. My tank is always half full but I don't think I'll be trying any of the EZ 2.0 systems.
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The very first thing I'd check is that someone didn't install the ECU and or ANY of it's wiring --- or any sensor wiring -- ANYWHERE and I mean ANYWHERE near a high energy ignition system (MSD etc). I can't even begin to tell you what manor of issues this can buy you. It just simply can't be emphasized enough.
IR need a fat fuel ratio -- the air to cylinder is just so F'n fast in these systems. They're not going to idle or run on a 14.7 AF.... Idle needs to be more like 13.8 -- you can lean the cruise out "a little" but a little isn't 15! And there's an accel fuel number (in the advanced settings window) that can be brought in to help a stumble. Be careful with this number - just bump it or lower it - 1 number at a time and let the ECU learn before you change anything else.