Paolo Castellano
Enthusiast
Are These A/F #\'s Normal?
Just dynoed my car this weekend and my power is down as compared to a couple years ago. With 35,000 miles on it, it made 464.6 RWHP and 503.3 RW LBS/FT corrected #'s. The car now has 68,000 miles on it and made 445 RWHP and 491 RW LBS/FT corrected #'s. This is the first time the dyno had the air-fuel ratio along with the horsepower/torque. On my best run which was the first one, the A/F was 15:1 @ 3200 RPM and 14.5:1 on the other 2 runs. At 3600 RPM, on the first run the A/F was 14.25:1 and 14:1 on the other two runs. At 4000 RPM, the A/F was just over 14:1 on the 1st run and slightly under on the others. From 4600-5000 RPM, the A/F was 13.5:1 and by 5800 the A/F was 13:1. The Dyno shop said my car was running way too lean; since I never dynoed my car with the A/F before this, I have no basis for comparison. What is the proper A/F throughout the RPM range? Paolo
Just dynoed my car this weekend and my power is down as compared to a couple years ago. With 35,000 miles on it, it made 464.6 RWHP and 503.3 RW LBS/FT corrected #'s. The car now has 68,000 miles on it and made 445 RWHP and 491 RW LBS/FT corrected #'s. This is the first time the dyno had the air-fuel ratio along with the horsepower/torque. On my best run which was the first one, the A/F was 15:1 @ 3200 RPM and 14.5:1 on the other 2 runs. At 3600 RPM, on the first run the A/F was 14.25:1 and 14:1 on the other two runs. At 4000 RPM, the A/F was just over 14:1 on the 1st run and slightly under on the others. From 4600-5000 RPM, the A/F was 13.5:1 and by 5800 the A/F was 13:1. The Dyno shop said my car was running way too lean; since I never dynoed my car with the A/F before this, I have no basis for comparison. What is the proper A/F throughout the RPM range? Paolo
