Math Problem.........
05-19-2007, 10:30 PM
#2
3rd Gear Member
Join Date: Jul 2005
Location:
Posts: 737
RE: Math Problem.........
you cant...most guesstimates Ive heard are adding 10~15% for sticks, 15~20% for automatics, but anything will be an estimate...only way to know for sure would be pull the motor and dyno it- or find someone that has ran a motor only on a dyno, then chassis dynoed afterwith same tranny/gears as youand see what their parisitic losses were thru the driveline- that would be pretty consistent...
05-19-2007, 10:31 PM
#3
3rd Gear Member
Join Date: May 2006
Location:
Posts: 803
RE: Math Problem.........
No way to calculate it,there ispower loss through the drivetrain usuallyassumed to be about 15% for manuals and 17% for automatics. I might be wrong about those numbers, but that's pretty close. So
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
05-19-2007, 10:52 PM
#6
3rd Gear Member
Thread Starter
Join Date: Sep 2006
Location: So. Calif.
Posts: 901
RE: Math Problem.........
ORIGINAL: Rt1Rebel
No way to calculate it,there ispower loss through the drivetrain usuallyassumed to be about 15% for manuals and 17% for automatics. I might be wrong about those numbers, but that's pretty close. So
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
No way to calculate it,there ispower loss through the drivetrain usuallyassumed to be about 15% for manuals and 17% for automatics. I might be wrong about those numbers, but that's pretty close. So
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
If some one has 280 RWHP what is the best guess at crank Hp?
05-19-2007, 11:02 PM
#9
4th Gear Member
Join Date: Mar 2006
Location: New Jersey
Posts: 1,609
RE: Math Problem.........
ORIGINAL: 07GTEddy
Ok, Lets say my math skills are crap................
If some one has 280 RWHP what is the best guess at crank Hp?
ORIGINAL: Rt1Rebel
No way to calculate it,there ispower loss through the drivetrain usuallyassumed to be about 15% for manuals and 17% for automatics. I might be wrong about those numbers, but that's pretty close. So
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
No way to calculate it,there ispower loss through the drivetrain usuallyassumed to be about 15% for manuals and 17% for automatics. I might be wrong about those numbers, but that's pretty close. So
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
If some one has 280 RWHP what is the best guess at crank Hp?
05-19-2007, 11:06 PM
#10
3rd Gear Member
Thread Starter
Join Date: Sep 2006
Location: So. Calif.
Posts: 901
RE: Math Problem.........
ORIGINAL: johnnyv8
(280/15%=42 + 280=322 crank hp) i think...But then again i just got a D in precal (long story, but im going to fight that grade)
ORIGINAL: 07GTEddy
Ok, Lets say my math skills are crap................
If some one has 280 RWHP what is the best guess at crank Hp?
ORIGINAL: Rt1Rebel
No way to calculate it,there ispower loss through the drivetrain usuallyassumed to be about 15% for manuals and 17% for automatics. I might be wrong about those numbers, but that's pretty close. So
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
No way to calculate it,there ispower loss through the drivetrain usuallyassumed to be about 15% for manuals and 17% for automatics. I might be wrong about those numbers, but that's pretty close. So
RWHP = CHP((100-15)/100) or CHP((100-17)/100)
If some one has 280 RWHP what is the best guess at crank Hp?
LOL
Last time for me was a long time ago and if i remember correctly it was a D-.
I think it was also my first class in the morning but, the beach was nicer..........
