Quote:
Originally Posted by TurboNova
One thing I didn't see mentioned was;
I returned my fuel back into the fuel fill tube. It unbolted from the tank, I welded a steel AN fitting and returned it back into the top of the stock tank.
Just like filling it up at the gas station. One thing for sure, you don't want to pickup fuel from one of those weld in sumps and return on the other side. We have had a ton of problems drag racing with the sump set up wrong this way getting air bubbles sucked into the fuel pump.
Now the supply, you need a better sump. On my stock 66 Nova wagon, I used the stock line to feed the engine and you can hear the pump pickup uncover when it gets below 1/4 tank and a hard corner but it still drives just fine. It's not a race car just a stock 283.
I personally saw a 572 GM crate engine on the Dyno at Fast that made 600hp give or take. They ran 60psi fuel pressure and it was correcting the fuel 30% at then end of the run. I am sure the next run it wouldn't have been so bad. They recommend the aeromotive pump upgrade above the 500hp. That is about all one of the walboro pumps are good for. No one here has talked about the Magnafuel pumps, they are about the best for electric pumps I believe.
As for Fast copying this, don't think so, this is just a dumbed down version of what they already have had for years. An EFI system that uses closed loop fuel to correct the VE table. Nothing new here. 4 Injectors in one throttle body? New? Accel has also had that for years too. Retrotek is new on the EFI scene, if anyone copied anyone it's them.
I know the Fast software engineer Lance has been working on this for at least 2 yrs, Fast contracted someone else to do the EZ EFI but weren't happy with what they got so Lance took what they had and rebuilt the software to work.
Now they are back to work improving the XFI software with new features.
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I deal with David Page at FAST quite a bit and we were talking about this out at SEMA last year when I was first looking at this system. He said they had him go in and set up an XFI system on the 572 and he spent about 4 hours getting everything setup and dialed in and pulled a solid number he was happy with. He went to lunch and they pulled off the XFI- stuck on an EZ EFI and in two pulls hit the same peak #s.
XFI has always had a "self tuning" feature. If you are centered in a cell on the VE table and hit L it will self adjust per your W02 reading vs your target air fuel. I've messed around with it a little bit but I've had better luck making manual adjustments. Apparently they've found a way to make it automatic.
I posted up in the other EZ EFI thread about the first one we are in process of doing and with the limited driving we've done so far I was really impressed with how fast it sorted out WOT. We're finishing up some suspension work on it right now but I'm planning putting some miles on it to see what it does for drivability. I'll let you guys know!