How much power loss 1/4 mile to high heat
07-19-2004, 08:18 AM
#1
Safety Car
Thread Starter
How much power loss 1/4 mile to high heat
Sunday was oldies day at New England Dragway it had to be 85, my best Et last fall (308 gears & stock exhaust) was 13.3 @ 105 MPH.... first run since I Installed 3.70 rear gears " BUT" my best et was only 13.4 @ 100 mph....how much power (hp) loss does 5 mph reflect??? my 60 foot times were in the 1.9 range....i could feel the definate lack of power compared to last year.my 66 B/B wieghs 3400 LBs with me in it (im chubbY) wont run agauin till Vette Viper day in October,,,,,,the Dog .. Woof
07-19-2004, 08:57 AM
#2
Race Director
Rough rule of thumb is 1/10 ET and 1 mph trap for every 10F. I used to have a 96 Z28 that ran high 12's in cold (low 40s) weather and mid 13's in the summer so it seems the rule is fairly accurate.
07-19-2004, 09:40 AM
#4
Safety Car
Maybe. It gets tricky since you have to calculate density altitude to come up with how much "good" air you have. Temperature is one component but it's almost always fool proof that lower temperatures means more horsepressure depending on carb jetting.
One other thing, though, is that the gear change could have thrown off your combination. If your engine easily pulls the gear and you're not overspeeding the engine on the shifts then you done good. But I see occasions where there is too much gear for the engine's torque curve.
One other thing, though, is that the gear change could have thrown off your combination. If your engine easily pulls the gear and you're not overspeeding the engine on the shifts then you done good. But I see occasions where there is too much gear for the engine's torque curve.
cool a track to much a traction is a problem 