Can someone explain...?

bimmerlex · 09-14-2008, 11:37 AM

I just went over the article about real horsepower of Nissan GT-R in C&D, and what they mentioned is that drivetrain loss for RWD manual is about 15%, but for 4-wheel-drive vehicles it's about 20%. How is that? I always thought that for 4-whell-drive there is almost no drivetrain loss. Was I wrong?

aut0sh0cker · 09-14-2008, 12:04 PM

you got it backwards man, awd will always have more drivetrain loss than rwd...

TaTaToothy · 09-14-2008, 12:26 PM

AWD drivetrains inherently create more drag due to the added moving parts causing additional friction and resistance.

bimmerlex · 09-14-2008, 04:12 PM

Ok, then another stupid question from me: if awd's drivetrain loss is bigger then how come they are considered faster (or quicker?) if they get less power to the wheels (considering the crank HP is the same as RWD)?

exidisjon · 09-14-2008, 04:14 PM

Quote:

Originally Posted by bimmerlex

Ok, then another stupid question from me: if awd's drivetrain loss is bigger then how come they are considered faster (or quicker?) if they get less power to the wheels (considering the crank HP is the same as RWD)?

Traction

stimpy · 09-14-2008, 04:41 PM

They will be faster out of the dig (off the line) as they have traction + more but won't have the top speed of a non awd.

bimmerlex · 09-14-2008, 05:05 PM

Ok, I get it now. Thanks for the explanation, guys...

09-14-2008, 11:37 AM	#1
bimmerlex Captain 26 Rep 865 Posts Drives: 2018 F15 X5 xDrive35d Join Date: Jan 2007 Location: SoCal. iTrader: (25) Garage List 2018 F15 X5 xDrive35D [0.00]	Can someone explain...? I just went over the article about real horsepower of Nissan GT-R in C&D, and what they mentioned is that drivetrain loss for RWD manual is about 15%, but for 4-wheel-drive vehicles it's about 20%. How is that? I always thought that for 4-whell-drive there is almost no drivetrain loss. Was I wrong?
	Appreciate 0 Tweet Quote

09-14-2008, 12:04 PM	#2
aut0sh0cker meh 123 Rep 1,756 Posts Drives: E92 335i, 997.2 C4S Join Date: Jan 2008 Location: 91362 iTrader: (2)	you got it backwards man, awd will always have more drivetrain loss than rwd...
	Appreciate 0 Quote

09-14-2008, 12:26 PM	#3
TaTaToothy First Lieutenant 11 Rep 327 Posts Drives: 2006 330i and 2002 M3 Join Date: Jan 2008 Location: Minneapolis, MN iTrader: (1)	AWD drivetrains inherently create more drag due to the added moving parts causing additional friction and resistance. __________________ 2006 330i - 6MT - Monaco Blue over black and burl walnut - Sport, Premium and Cold Weather packages and Comfort Access 2002 M3 - 6MT - Jet Black over black leather - Xenon, power seats and H/K - no sunroof
	Appreciate 0 Quote

09-14-2008, 04:12 PM	#4
bimmerlex Captain 26 Rep 865 Posts Drives: 2018 F15 X5 xDrive35d Join Date: Jan 2007 Location: SoCal. iTrader: (25) Garage List 2018 F15 X5 xDrive35D [0.00]	Ok, then another stupid question from me: if awd's drivetrain loss is bigger then how come they are considered faster (or quicker?) if they get less power to the wheels (considering the crank HP is the same as RWD)?
	Appreciate 0 Quote

09-14-2008, 04:41 PM	#6
stimpy Colonel 167 Rep 2,210 Posts Drives: E92 335i Join Date: Feb 2008 Location: Phoenix AZ iTrader: (7)	They will be faster out of the dig (off the line) as they have traction + more but won't have the top speed of a non awd.
	Appreciate 0 Quote

09-14-2008, 05:05 PM	#7
bimmerlex Captain 26 Rep 865 Posts Drives: 2018 F15 X5 xDrive35d Join Date: Jan 2007 Location: SoCal. iTrader: (25) Garage List 2018 F15 X5 xDrive35D [0.00]	Ok, I get it now. Thanks for the explanation, guys...
	Appreciate 0 Quote