HP Rating
Thread Starter
Le Mans Master
Joined: Nov 2014
Posts: 6,117
Likes: 113
From: Texas
HP Rating
This article states that the HP rating of the Corvette given (mine is NPP so 436 hp) is RWHP. I assumed the rating was given at crank and I was maybe 380 RWHP, but the article has me wondering if my 436 is RWHP.
What is the RWHP of a stocker LS3 with NPP?
http://www.superchevy.com/features/g...2-grand-sport/
What is the RWHP of a stocker LS3 with NPP?
http://www.superchevy.com/features/g...2-grand-sport/
Drifting
Joined: Sep 2012
Posts: 1,371
Likes: 19
From: Pittsburgh
Yeah manufacturers always quote crank HP. But when you're on a Chassis Dyno its WHP. I've had people at the shop confused when they run their stock car and it makes less than what is quoted from the factory then they undersnd when I explain its crank HP
Race Director
Joined: Dec 2013
Posts: 12,502
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Race Director
Joined: Oct 2005
Posts: 14,999
Likes: 200
From: Bay Area Ca.
Plus I believe there is a 2% +- at the rated hp number. So for the GM 430 number it could be
438.6 or 421.4 or any number in between.
It would be interesting to see what the standard deviation is and a bell curve.
438.6 or 421.4 or any number in between.
It would be interesting to see what the standard deviation is and a bell curve.
Thread Starter
Le Mans Master
Joined: Nov 2014
Posts: 6,117
Likes: 113
From: Texas
A 12% loss is darned efficient. We figure that in bikes which have much simpler / shorter drivelines.
Sure, I know there must be sample variances. Even if these were handbuilt they'd show a 2% or so variance.
Sure, I know there must be sample variances. Even if these were handbuilt they'd show a 2% or so variance.
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 25
From: Austin Texas
Instead of percentages use a fixed number. The numbers below seem to work for the C6 variations of the LS motors. SAE corrected Dynojet.
50 to 60 HP loss for manual transmission.
60 to 70 HP loss for auto transmission.
It doesn't take a higher percentage of power to run the same driveline, same driveline, same power used.
50 to 60 HP loss for manual transmission.
60 to 70 HP loss for auto transmission.
It doesn't take a higher percentage of power to run the same driveline, same driveline, same power used.
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