I'm trying to understand the tuning aspects of the FAST system a bit better. I realize the less O2 correction you have, the closer your tune will be and it will be easier for the ECU to achieve the target A/F ratio, but if you have a 15 or 20 % correction, is the ECU actually able to correct it enough ? I don't just mean at the track, but in everyday street cruising also.
Is the "actual A/F" ratio shown on the dashboard the corrected ratio or is it the figure before the ECU makes an adjustment ?
Is the "O2 correction %" on the dashboard the amount its trying to correct to, or the actual amount it's already made correction of ?
I have a Tip in problem only when warmed up. If I'm at a stop and quickly give it anywhere from a 1/4 - 1/2 throttle, she will bog and sometimes stall. It will also bog if cruising at 5 - 35 MPH at light throttle and then quickly give it a short pump of the throttle. I've played with the AE tables (adjusting them quite a bit richer than it was) and it's better than before, but it's still not right. I don't know if I'm getting close to being too rich now ? I think it has a 70 mm throttle body so when it opens, it probably needs quite a bit of fuel to make up for it. I just purchased this Turbo "T" a few weeks ago and it seems to run fine on the street with the calibration it had, except the bog. I've messed with the VE table to get the O2 correction as low as possible for street driving, but I read that "norbs" had to put the VE #'s at idle and around 100 kpa to around 70, to help with a bog. Mine were already in the high 60's in that area. Any suggestions ? I have a carburated 87 V-6 regal with no bog...I should be able to tune it out of a FI computer controlled turbo V-6 !!!
I just installed a cat to try to pass emissions. Any suggestions on tuning for this ? I've set Target A/F to 14.7 around the cruise RPM & load for the test (dyno in Mass) so I don't kill the cat. I tried to pass just the way I recieved it (without cat), but it failed by a small amount HC limit 2.00 - I had 2.53 NOX limit 3.00 - I had 3.26 it passed the CO w/ 26.95 on a 30.00 limit. Unfortunatly it has no EGR due to M&A heads. It has a 160 T-stat, but should I run it hot by increasing the fan on & off temps ?
Help or suggestions on any of the above would be appreciated !!
I can e.mail more details on the build-up or send a .GCT file to anyone that wants it.
Regards, Clem
Is the "actual A/F" ratio shown on the dashboard the corrected ratio or is it the figure before the ECU makes an adjustment ?
Is the "O2 correction %" on the dashboard the amount its trying to correct to, or the actual amount it's already made correction of ?
I have a Tip in problem only when warmed up. If I'm at a stop and quickly give it anywhere from a 1/4 - 1/2 throttle, she will bog and sometimes stall. It will also bog if cruising at 5 - 35 MPH at light throttle and then quickly give it a short pump of the throttle. I've played with the AE tables (adjusting them quite a bit richer than it was) and it's better than before, but it's still not right. I don't know if I'm getting close to being too rich now ? I think it has a 70 mm throttle body so when it opens, it probably needs quite a bit of fuel to make up for it. I just purchased this Turbo "T" a few weeks ago and it seems to run fine on the street with the calibration it had, except the bog. I've messed with the VE table to get the O2 correction as low as possible for street driving, but I read that "norbs" had to put the VE #'s at idle and around 100 kpa to around 70, to help with a bog. Mine were already in the high 60's in that area. Any suggestions ? I have a carburated 87 V-6 regal with no bog...I should be able to tune it out of a FI computer controlled turbo V-6 !!!
I just installed a cat to try to pass emissions. Any suggestions on tuning for this ? I've set Target A/F to 14.7 around the cruise RPM & load for the test (dyno in Mass) so I don't kill the cat. I tried to pass just the way I recieved it (without cat), but it failed by a small amount HC limit 2.00 - I had 2.53 NOX limit 3.00 - I had 3.26 it passed the CO w/ 26.95 on a 30.00 limit. Unfortunatly it has no EGR due to M&A heads. It has a 160 T-stat, but should I run it hot by increasing the fan on & off temps ?
Help or suggestions on any of the above would be appreciated !!
I can e.mail more details on the build-up or send a .GCT file to anyone that wants it.
Regards, Clem