280 whp = what at flywheel?
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#15
the burninator
iTrader: (11)
Originally posted by dansouliere
There is no guessing required ppl. There is a 15% difference between flywheel and rwhp.
280hp X 15% = 322rwhp
There is no guessing required ppl. There is a 15% difference between flywheel and rwhp.
280hp X 15% = 322rwhp
you're doing it backwards
for example, 322 x .85 does not equal 280
it's 273.7
you'd actually need to multiply 280 by 1.1764 (or 100/85)
that'd give you 329.4 crank hp
it's all contigent on what the base dyno whp was at..
maybe someone has 280whp, but their base dyno was 270 - so that wouldn't be much of an improvment.
Without knowing the base dyno, we can only guess what crank hp it'd be
#16
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You divide crank hp by Y (any number you want to use as the drivetrain loss), then take number, remember it, do the crank hp minus the number you got when you divided crank hp by Y, and there's the WHP, it's a trial and error to see what drivetrain number is closest to the WHP number.
Here it is:
A= Crank HP
B= Drivetrain loss %
C= Wheel horsepower
D= Drivetrain loss in hp
A divided by B = D
A minus D = C
Here it is:
A= Crank HP
B= Drivetrain loss %
C= Wheel horsepower
D= Drivetrain loss in hp
A divided by B = D
A minus D = C
#17
Registered User
iTrader: (19)
Originally posted by nis350ztt
Assuming the stock crank is 280-287hp. Most Z's (manual) are 236-244rwhp, that's around 6-7% drivetrain loss.
Assuming the stock crank is 280-287hp. Most Z's (manual) are 236-244rwhp, that's around 6-7% drivetrain loss.
287 HP to crank - stock figures
240 HP to th wheels - give or take stock figures
240/287 = 83.6% which equates to 16.4% drivetrain loss
Using this figure to find what 280rwhp equates to:
280/X = 83.6% - Where X = our crank HP number
So:
280 = .836X
280/.836 = X
or
X= 334.9 BHP
EDIT:
334.9 BHP assumes a stock Z with 287BHP will produce 240 HP at the wheels.
Originally posted by nis350ztt
You divide crank hp by Y (any number you want to use as the drivetrain loss), then take number, remember it, do the crank hp minus the number you got when you divided crank hp by Y, and there's the WHP, it's a trial and error to see what drivetrain number is closest to the WHP number.
Here it is:
A= Crank HP
B= Drivetrain loss %
C= Wheel horsepower
D= Drivetrain loss in hp
A divided by B = D
A minus D = C
You divide crank hp by Y (any number you want to use as the drivetrain loss), then take number, remember it, do the crank hp minus the number you got when you divided crank hp by Y, and there's the WHP, it's a trial and error to see what drivetrain number is closest to the WHP number.
Here it is:
A= Crank HP
B= Drivetrain loss %
C= Wheel horsepower
D= Drivetrain loss in hp
A divided by B = D
A minus D = C
Last edited by nis350ztt; 02-20-2005 at 02:07 PM.
#18
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Originally posted by Zivman
I hope no one cheats off your math test:
287 HP to crank - stock figures
240 HP to th wheels - give or take stock figures
240/287 = 83.6% which equates to 16.4% drivetrain loss
Using this figure to find what 280rwhp equates to:
280/X = 83.6% - Where X = our crank HP number
So:
280 = .836X
280/.836 = X
or
X= 334.9 BHP
EDIT:
334.9 BHP assumes a stock Z with 287BHP will produce 240 HP at the wheels.
simple algebra - not "trial and error" -
I hope no one cheats off your math test:
287 HP to crank - stock figures
240 HP to th wheels - give or take stock figures
240/287 = 83.6% which equates to 16.4% drivetrain loss
Using this figure to find what 280rwhp equates to:
280/X = 83.6% - Where X = our crank HP number
So:
280 = .836X
280/.836 = X
or
X= 334.9 BHP
EDIT:
334.9 BHP assumes a stock Z with 287BHP will produce 240 HP at the wheels.
simple algebra - not "trial and error" -
How do you get 16.4% from 83.6%?
#20
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Join Date: Jun 2003
Location: Bay Area
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Originally posted by nis350ztt
Assuming the stock crank is 280-287hp. Most Z's (manual) are 236-244rwhp, that's around 6-7% drivetrain loss.
Assuming the stock crank is 280-287hp. Most Z's (manual) are 236-244rwhp, that's around 6-7% drivetrain loss.