Car and Driver article on chassis dynos, clearly not the best way to measure HP.
05-07-2004, 07:36 PM
#16
Rennlist Member
2nd gear will probably slip, 3rd gear is still too high of a reduction, and 4th seems to be the best gear, as the accleration is slower, again, more closely like real life. (ie 60-140mph!)
the higher the ratio, the more the losses. generally, its about 7hp per gear. who knows why you saw 33hp , but I would bet most of it was wheel slip. lots depends on the operator, how its tied down and the air in the tires. (most of the temp, atmosph. conditions , again, are factored in with the SAE numbers, But , I like to look at both.)
mk
the higher the ratio, the more the losses. generally, its about 7hp per gear. who knows why you saw 33hp , but I would bet most of it was wheel slip. lots depends on the operator, how its tied down and the air in the tires. (most of the temp, atmosph. conditions , again, are factored in with the SAE numbers, But , I like to look at both.)
mk
Originally posted by Tony
heres a way to cheat.
On a dynojet I ran in 2nd gear and got 270ish ftlbs....then ran in 3rd and got 303 ftlbs..
So whats the standard for an AUTO? 2nd grear pull or 3rd?
I assume 2nd gear as those are the numbers mine seems to compare to most often?
heres a way to cheat.
On a dynojet I ran in 2nd gear and got 270ish ftlbs....then ran in 3rd and got 303 ftlbs..
So whats the standard for an AUTO? 2nd grear pull or 3rd?
I assume 2nd gear as those are the numbers mine seems to compare to most often?
