Took the car to get some dyno A/F, hp, torque, fuel pressure information today. I would appreciate any learned input on my findings. I have a '95, with headers, and exhaust.......HID's too.''
To start, at idle, the rail pressure was sitting at 40 psi (with 20 inches? of vacuum), but 50 psi with the vacuum line removed (static pressure). Was getting 355 hp/265tq, but with a hint of pinging, and 12.5 to 14.0 A/F. I gradually raised the rail pressure via the FPR at 2 psi intervals. Finally boosted the rail pressure up to 49 psi (60 psi with the vacuum line removed) and the pinging was gone. Rail pressure went up to 95-100 psi at 8K rpm's. The A/F ranged from 11.9 to 12.6. The FPR adjustment screw was about 0.2 inches above the lock nut, close to all the way in. I was getting 359.8hp/272.0tq.
After this run we let the car set for 30 minutes for lunch, and I reset the ECU (pulled the 7.5 amp fuse for 45 seconds). Started the car after lunch, and let the car idle for 4 minutes, and ran three runs.
A/F HP Torque
Run #1 13.1 - 11.0 358 260
Run #2 12.2 - 10.8 358 264
Run #3 12.6 - 11.9 360 272
NOTE: Run #3 hp/tq curve was virtually linear, unlike run 1 & 2 which had the usual V-TEC blip at 5300 rpm's.
NOTE: According to Comptech, the FPR under vacuum should be 40-44 psi, and 58-62 psi static pressure.
Questions:
Is the FPR adjustment screw too far in compared to others?
What A/F ratio should I be looking for?
As runs 1,2,3 seem to be converging on the right/desired a/f, and have the most hp & tq, does the ECU have a learn mode?
What rail pressures are others getting/using?
Any comments/questions would be greatly appreciated.
Thanks,
Gene
To start, at idle, the rail pressure was sitting at 40 psi (with 20 inches? of vacuum), but 50 psi with the vacuum line removed (static pressure). Was getting 355 hp/265tq, but with a hint of pinging, and 12.5 to 14.0 A/F. I gradually raised the rail pressure via the FPR at 2 psi intervals. Finally boosted the rail pressure up to 49 psi (60 psi with the vacuum line removed) and the pinging was gone. Rail pressure went up to 95-100 psi at 8K rpm's. The A/F ranged from 11.9 to 12.6. The FPR adjustment screw was about 0.2 inches above the lock nut, close to all the way in. I was getting 359.8hp/272.0tq.
After this run we let the car set for 30 minutes for lunch, and I reset the ECU (pulled the 7.5 amp fuse for 45 seconds). Started the car after lunch, and let the car idle for 4 minutes, and ran three runs.
A/F HP Torque
Run #1 13.1 - 11.0 358 260
Run #2 12.2 - 10.8 358 264
Run #3 12.6 - 11.9 360 272
NOTE: Run #3 hp/tq curve was virtually linear, unlike run 1 & 2 which had the usual V-TEC blip at 5300 rpm's.
NOTE: According to Comptech, the FPR under vacuum should be 40-44 psi, and 58-62 psi static pressure.
Questions:
Is the FPR adjustment screw too far in compared to others?
What A/F ratio should I be looking for?
As runs 1,2,3 seem to be converging on the right/desired a/f, and have the most hp & tq, does the ECU have a learn mode?
What rail pressures are others getting/using?
Any comments/questions would be greatly appreciated.
Thanks,
Gene