hp loss when comparing crank to wheel power? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Mustangs Suck · 06-30-2004, 09:35 AM

Quick Question - My 240sx dynoed 136 hp and 134 tq at the wheels, just wondering what it would approximately be at the crank as I have no clue how much of loss there is from the crank to the wheels.

Thanks.

*exitspeed* · 06-30-2004, 09:57 AM

this is a guess, but I think it's like 30%. I'm sure if I'm wrong someone will correct me.

twitchy · 06-30-2004, 10:13 AM

15 percent is average

Levi@GTPRO · 06-30-2004, 10:14 AM

I though it was 20% loss of power when dynoing on the wheels versus the flywheel.

90RS13 · 06-30-2004, 10:46 AM

Cars are different. There's no excact measurement like "20%, or 15%" Also just wanted to add that even talking just whp, dynos are different too. Go to 5 different dynos and you'll get 5 different graphs. They can very more than 10 HP, even on dynojets.

5Z S13 · 06-30-2004, 11:16 AM

so many variables its crazy, just know that if power goes to some extreme number like 50% orig. theres something wrong... obviously.

KA24DESOneThree · 06-30-2004, 02:37 PM

The universally accepted number is around 17.3% parasitic loss through the drivetrain. Thus, it's 159.528 bhp.

06-30-2004, 09:35 AM	#1
Mustangs Suck Zilvia Member Join Date: Apr 2003 Location: Wisconsin Age: 39 Posts: 214 Trader Rating: (0) Feedback Score: 0 reviews	hp loss when comparing crank to wheel power? Quick Question - My 240sx dynoed 136 hp and 134 tq at the wheels, just wondering what it would approximately be at the crank as I have no clue how much of loss there is from the crank to the wheels. Thanks. __________________ 1993 Red 240sx KA-T 1993 Red 240sx: Sold 1990 Black 240sx: Sold

06-30-2004, 09:57 AM	#2
exitspeed aWingThing.com Join Date: Mar 2003 Location: Milwaukee, WI Age: 45 Posts: 20,900 Trader Rating: (1) Feedback Score: 1 reviews	this is a guess, but I think it's like 30%. I'm sure if I'm wrong someone will correct me. __________________ What I do for a living...www.mhrussell.com

06-30-2004, 10:13 AM	#3
twitchy Zilvia FREAK! Join Date: Apr 2003 Location: Ontario Posts: 1,579 Trader Rating: (0) Feedback Score: 0 reviews	15 percent is average __________________ Who the hell needs a sig anyhow

06-30-2004, 10:14 AM	#4
Levi@GTPRO Zilvia Member Join Date: Dec 2003 Location: Industry Age: 43 Posts: 262 Trader Rating: (0) Feedback Score: 0 reviews	I though it was 20% loss of power when dynoing on the wheels versus the flywheel. __________________ VisitGTPRO! This post has been brought to you by LAND HO the fresh makers!

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06-30-2004, 10:46 AM	#5
90RS13 Zilvia Junkie Join Date: May 2004 Location: Newark, Arkansas Age: 41 Posts: 348 Trader Rating: (0) Feedback Score: 0 reviews	Cars are different. There's no excact measurement like "20%, or 15%" Also just wanted to add that even talking just whp, dynos are different too. Go to 5 different dynos and you'll get 5 different graphs. They can very more than 10 HP, even on dynojets.

06-30-2004, 11:16 AM	#6
5Z S13 Join Date: Jun 2004 Location: SoCal Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	so many variables its crazy, just know that if power goes to some extreme number like 50% orig. theres something wrong... obviously.

06-30-2004, 02:37 PM	#7
KA24DESOneThree Post Whore! Join Date: Feb 2004 Location: SD County SoCal Age: 39 Posts: 2,564 Trader Rating: (2) Rides Gallery: KA24DESOneThree Feedback Score: 2 reviews	The universally accepted number is around 17.3% parasitic loss through the drivetrain. Thus, it's 159.528 bhp.