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Feb 10, 2005 | 12:39 PM

c6nut

Thread Starter

Burning Brakes

Joined: Aug 2004

Posts: 945

Likes: 0

From: Bloomingdale IL

Does anyone know?

Can anyone tell me how much HP at the engine 436 RWP equates to? Also what the calculation is.I have an MN6 C6 with some work.

Thanks,
Ted

Feb 10, 2005 | 01:34 PM

Asterism

Racer

Joined: Nov 2004

Posts: 472

Likes: 22

very cool set of "car math" links:
http://www.cobralads.com/car_math.html
(apparently some of the links dont work though..

)

Last edited by Asterism; Feb 11, 2005 at 01:00 AM.

Feb 10, 2005 | 11:02 PM

Yogivette

Drifting

Joined: May 2003

Posts: 1,260

Likes: 1

From: South Carolina

really...that seems really high to me although i dont know too much about it...although i thought like 550bhp were getting like 490-510 to the wheels????

Feb 11, 2005 | 12:09 AM

Dave_Busch

Burning Brakes

Joined: Jul 2004

Posts: 855

Likes: 11

There is about a 15 percent loss through the drive train on a 6spd. The A4 will have more. 436 RWHP is approximately 513 BHP or flywheel horse power.

Feb 11, 2005 | 12:56 AM

Yogivette

Drifting

Joined: May 2003

Posts: 1,260

Likes: 1

From: South Carolina

Quote:

Originally Posted by Dave_Busch

There is about a 15 percent loss through the drive train on a 6spd. The A4 will have more. 436 RWHP is approximately 513 BHP or flywheel horse power.

HOLY CRAP I WAS RIGHT FOR ONCE

Feb 11, 2005 | 11:31 AM

andreas g.

Drifting

Joined: Nov 2002

Posts: 1,651

Likes: 125

From: laguna niguel ca

calculating crank HP

take your RWHP or TQ and divide it by .85.

example: 436 divided by .85 = 512.9 crank HP

Feb 11, 2005 | 12:45 PM

catbert

Le Mans Master

Joined: Mar 2000

Posts: 6,560

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From: Tobacco Road NC

Quote:

Originally Posted by Dave_Busch

There is about a 15 percent loss through the drive train on a 6spd. The A4 will have more. 436 RWHP is approximately 513 BHP or flywheel horse power.

Isn't a lot of the loss of HP be caused by constants like gears, temps, etc? If the losses are caused by constants, shouldn't the percentage of loss be smaller as the gross horsepower goes up? ie 15% on a 300 ghp motor and something less on a 450 ghp? This isn't a loaded question - I really am curious.

Feb 11, 2005 | 01:31 PM

shopdog

Race Director

Joined: Oct 2004

Posts: 10,089

Likes: 14

Quote:

Originally Posted by catbert

The losses are friction losses. Friction loss increases with increasing contact pressure and with increasing gear speed. So the more torque (and hence power) transmitted through the transmission, the greater the pressure between gear teeth, and the greater the loss. Also, the faster the gears turn, the greater the friction, and the greater the losses. Losses are least at any RPM when the gear ratio is 1:1.