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Well, kinda...
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These are the uncorrected dyno numbers - the actual data collected by the dyno...
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This is the SAE corrected plot... Corrected for elevation, temperature, humidity, and whatever else they correct for...
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I did my baseline dyno runs this morning. My car is a 2000 Prelude 5spd. It has almost exactly 15,000 miles on it. I broke it in very carefully.... 8-500mi: under 4000rpm, 500-1000mi: under 5000rpm, 1000-1200: Started dipping into VTEC occaisionally, 1200mi+ - VTEC and trips to redline... I'm running bone-stock except for my new 17" wheels with 215/40/17 tires.
Runs were done on a Dynojet 248c. Temp was 50F, Barometer was 30.17-0.43in.Hg, Elevation 0ft., and CF=0.95 (What is "CF"? "Correction Factor"?...Would that make my CF=-5%?) I don't know why, but these stats appear scrambled on the Plots that they gave me on diskette...
OK. First off, I learned today that I was very incorrect in several recent posts where I indicated that 3rd gear dyno runs should yield higher numbers than 4th gear... In fact, just the opposite is true (by a slim margin). On the 5spd, 4th gear is the closest gear to 1:1 (or specifically - 1.034:1). As I said before, 4th gear would yield the most realistic numbers since it is so nearly 1:1. But contrary to what I previously thought, 3rd gear does not give exaggerated numbers. 3rd gear actually gives slightly *lower* numbers. The dyno tech described it to me as the lower gear "reducing" torque to the wheels. This is somewhat evidenced in my 2 runs. Run 1 (GREEN/BLACK) was in 3rd gear, while run 2 (BLUE/BLUE) was done in 4th gear. Run 2 in 4th gear netted me 162.8HP and 137.5lb/ft. Run 1 in 3rd yielded slightly lower numbers, although the difference was so small that it was essentially irrelevant what gear I ran it... (I'm still curious why this is, and I've been looking all day at work for the formulas to calculate what the power reduction/multiplication would be in each of the various gears... If anyone has any idea what I'm talking about, pls email me...
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Secondly, I learned how easy it would be to misinterpret or even manipulate dyno numbers... Just look at the difference between my SAE corrected and uncorrected plot... It's +5%!!
So anytime you see a dyno plot that says "Actual Horsepower" and "Actual Torque" instead of "SAE Horsepower" and "SAE Torque", take that with a grain of salt if you plan on using it for comparsions sake... I believe that most SAE corrected plots are corrected UP, but mine happened to be corrected DOWN because of the ideal conditions today...
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But 162.8HP and 137.5lb/ft. is still pretty high for a bone-stock 5th gen... So all in all, I was pleasently surprised with the numbers, even with SAE correction.
...But the best part was that I got a tour of DuPont Motorsport's SpeedVision Touring Car prep facility!! Check out some pics...
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http://honda-acura.net/forum/Forum20/HTML/009264.html
Andrew
These are the uncorrected dyno numbers - the actual data collected by the dyno...
This is the SAE corrected plot... Corrected for elevation, temperature, humidity, and whatever else they correct for...
I did my baseline dyno runs this morning. My car is a 2000 Prelude 5spd. It has almost exactly 15,000 miles on it. I broke it in very carefully.... 8-500mi: under 4000rpm, 500-1000mi: under 5000rpm, 1000-1200: Started dipping into VTEC occaisionally, 1200mi+ - VTEC and trips to redline... I'm running bone-stock except for my new 17" wheels with 215/40/17 tires.
Runs were done on a Dynojet 248c. Temp was 50F, Barometer was 30.17-0.43in.Hg, Elevation 0ft., and CF=0.95 (What is "CF"? "Correction Factor"?...Would that make my CF=-5%?) I don't know why, but these stats appear scrambled on the Plots that they gave me on diskette...
OK. First off, I learned today that I was very incorrect in several recent posts where I indicated that 3rd gear dyno runs should yield higher numbers than 4th gear... In fact, just the opposite is true (by a slim margin). On the 5spd, 4th gear is the closest gear to 1:1 (or specifically - 1.034:1). As I said before, 4th gear would yield the most realistic numbers since it is so nearly 1:1. But contrary to what I previously thought, 3rd gear does not give exaggerated numbers. 3rd gear actually gives slightly *lower* numbers. The dyno tech described it to me as the lower gear "reducing" torque to the wheels. This is somewhat evidenced in my 2 runs. Run 1 (GREEN/BLACK) was in 3rd gear, while run 2 (BLUE/BLUE) was done in 4th gear. Run 2 in 4th gear netted me 162.8HP and 137.5lb/ft. Run 1 in 3rd yielded slightly lower numbers, although the difference was so small that it was essentially irrelevant what gear I ran it... (I'm still curious why this is, and I've been looking all day at work for the formulas to calculate what the power reduction/multiplication would be in each of the various gears... If anyone has any idea what I'm talking about, pls email me...
Secondly, I learned how easy it would be to misinterpret or even manipulate dyno numbers... Just look at the difference between my SAE corrected and uncorrected plot... It's +5%!!
So anytime you see a dyno plot that says "Actual Horsepower" and "Actual Torque" instead of "SAE Horsepower" and "SAE Torque", take that with a grain of salt if you plan on using it for comparsions sake... I believe that most SAE corrected plots are corrected UP, but mine happened to be corrected DOWN because of the ideal conditions today...
But 162.8HP and 137.5lb/ft. is still pretty high for a bone-stock 5th gen... So all in all, I was pleasently surprised with the numbers, even with SAE correction.
...But the best part was that I got a tour of DuPont Motorsport's SpeedVision Touring Car prep facility!! Check out some pics...
http://honda-acura.net/forum/Forum20/HTML/009264.html
Andrew
