FAST old gray box software
 

I don't know if the software I have is incomplete or what but the only tuning I seem to be able to do is acceleration enrichment, I can't find a way to change the pulsewidth or A/F ratio. Anybody have any tunes or software for this thing? It's on a 350 TPI motor.

Re: FAST old gray box software
 

Go to this link: https://www.fuelairspark.com/software-downloads

Then look for "C-Com WP - For Grey Box FAST ECU"

Re: FAST old gray box software
 

When I click that link all I get is a bunch of garbage about gaming and advertisements.

Re: FAST old gray box software
 

Link works for me.

Then scroll down to the early software download.

Re: FAST old gray box software
 

So I figured out how to use the software I have so I don't need anything but time to play with it. The problem I was having was running too rich at idle and blacking the plugs. I got that fixed.

Re: FAST old gray box software
 

I just about have this thing straightened out but I can't get the O2 sensor to work. Any body that knows anything about EFI knows without an O2 your tuning blind. I guess I'm going to have to call FAST. That'll kill about an hour or two.

Re: FAST old gray box software
 

Any ideas? I still can't get the O2 to read. Wondering if I get a separate O2 can I overlay it on my graph to try to get the fuel right.

Re: FAST old gray box software
 

I have an almost new FAST XFI used on my TPI motor for about 20 passes for sale. Includes wiring, ECU, O2 Sensor, software, works perfect. PM me if interested. Mike McMahan 2543 H/SA

Re: FAST old gray box software
 

So FAST is telling me this thing will never run right without an O2 reading. I thought if you ran it in open loop, which I thought everybody did, it wouldn't matter if it gets an O2 signal or not.

Re: FAST old gray box software
 

I run a holley dominator ecu in closed loop. It runs consistent and pretty fast.