hey all,
Just thought I'd share some info on how my FAST system is progressing.
I have a 178 CI engine (2.9L), with 96lb. injectors, and a T66 turbo. I am running the FAST bank to bank with wide band O2.
I was trying to tune the car last night for about 4 hours, and wasn't having much luck. My air fuel seemed to be all over the place. I'd change the Fuel map values up or down just a couple points, or a couple percent, and I'd go from really rich to really lean or lean to really rich. (all testing was done in vacuum "under 100kpa"). I was getting very frustrated with all way the tuning seemed to be showing signs of NO improvement what so ever. I decided to call it quits because the neighbors probably didn't like the midnight testing of my car with 4" exhaust
I starting thinking about the Injector opening time, and had spoken with Craig to find out about the impact it had on the injectors at low RPM's. I decided to drop the default injector opening time (global setting) from 1.0ms to 0.5ms. Then I changed the fuel values to what I thought would be close to the same A/F. I started the car, and made a quick adjustment until I had the 14.0 A/F I was hoping for, and took the car for a spin around the block. Wow, it was running very very well. It didn't have the stumbles, and stutters, and smoke that it had for the 4 hours the night before. In fact, the car almost ran like stock....
Now its time to get the car doing some testing under boost
Just thought I'd share the problem I was having, and what I did to correct it.
Thanks,
James
Just thought I'd share some info on how my FAST system is progressing.
I have a 178 CI engine (2.9L), with 96lb. injectors, and a T66 turbo. I am running the FAST bank to bank with wide band O2.
I was trying to tune the car last night for about 4 hours, and wasn't having much luck. My air fuel seemed to be all over the place. I'd change the Fuel map values up or down just a couple points, or a couple percent, and I'd go from really rich to really lean or lean to really rich. (all testing was done in vacuum "under 100kpa"). I was getting very frustrated with all way the tuning seemed to be showing signs of NO improvement what so ever. I decided to call it quits because the neighbors probably didn't like the midnight testing of my car with 4" exhaust
I starting thinking about the Injector opening time, and had spoken with Craig to find out about the impact it had on the injectors at low RPM's. I decided to drop the default injector opening time (global setting) from 1.0ms to 0.5ms. Then I changed the fuel values to what I thought would be close to the same A/F. I started the car, and made a quick adjustment until I had the 14.0 A/F I was hoping for, and took the car for a spin around the block. Wow, it was running very very well. It didn't have the stumbles, and stutters, and smoke that it had for the 4 hours the night before. In fact, the car almost ran like stock....
Now its time to get the car doing some testing under boost
Just thought I'd share the problem I was having, and what I did to correct it.
Thanks,
James
