....I've got better things to do than play on my computer all day mate...
BAHAHAHAHAHAHAHAHAHAHAHAHAHAHHAHAHAHAH HAHAHAH Ha ah ha ha ha ah ha, errr ha ha, he ha errr, you crack me up mate.
A HP calculator:
http://www.speedworl...ex.com/calc.htm-------------------------------
About the calculator:
The algorithm they use is a very simple one that uses some constants that they must've derived by plotting some known data, extrapolating and then developing a generalised equation, I dunno, I guessing.
The thing is, does the weight include the weight of the driver (say an extra 100Kgs)?, they don't say, but they do assume 18% drivetrain loss.
The result Starts with RWHP and then multiplies it by 1.18 to get Flywheel HP
1150Kg car (?pretty light?) + 100Kg = 1250Kg = 2,755lbs
Enter this with an ET of 14.852
and you get 166RWHP and 196BHP at the Flywheel according to them
The calculator is fine, but I would ignore their calculation for the Flywheel HP
The problem I found with the calculators is how they factor in the drivetrain loss. The add 18% of the RWHP to calculate Flywheel HP. BUT that is not the drivetrain loss as a loss should be calculated as a percentage based on the power source.
In other words, it should NOT be RWHP x (1+loss) = FWHP, It should be RWHP/(1-loss) = FWHP
From this, using their logic, to get 121.8RWHP from 196Flywheel HP you would have to use a factor of 61% as 121.8 x 1.61 = 196.
It should be 121.8RWHP/(1-0.378) = 196BHP, which uses 38% drivetrain loss
So Their "18% drivetrain loss" is actually 15% drivetrain loss
I wouldn't use 30%, it sounds too high and automatic specialists never agree with it and I've never seen evidence yet to prove it. 18 to 20% can justify the losses throughout the system including the auto and diff etc.
-------------------------------
enough about the calculator,
If we do it again properly with 2,755lbs and an ET of 14.852 with 18% drivetrain loss we get:
166RWHP and 202BHP at the Flywheel
Can a 186 make 200BHP at the flywheel? I don't know, maybe if its worked off it's head, I'll guess that he gets 150RWHP or slightly higher, when he Dyno's it
By the way 1HP = 0.75KW
Peace.
Edited by TORANR AMORE, 10 March 2006 - 05:07 PM.
