Horsepower loss threw drivetrain
Racer
Joined: Dec 2006
Posts: 4,434
Likes: 18
From: Braselton GA
On a drum/inertia dyno, it's gonna vary, even among the same cars. Clutch/FW weight (MOI), tranny and diff fluids, rear rotor/(2pc?) wheel weight, and most importantly tire weight.
On a C5, based on what I've observed, I'd say 14-17%.
On a C5, based on what I've observed, I'd say 14-17%.
Burning Brakes
Joined: Aug 2000
Posts: 1,132
Likes: 1
From: Morganton, NC, USA
One of the cable car shows recently showed a new Z06 on a chassis dyno. They got 425 rwhp, which is a 16 % loss from the rated 505 flywheel hp. If the car was very new, rwhp should increase slightly as the engine and drivetrain components "break in."
Advanced
Joined: Oct 2006
Posts: 93
Likes: 0
From: Caldwell Idaho
How are percentages accurate in these cases? I have always wondered...
If a stock motor is rated at 400hp, and another has 500, and both have a 15% lose but go through the same drive train.. The 400hp car would put out 340rwhp losing 60 hp and the 500hp car would put out 425rwhp losing 75hp.. even though the drive train is the exact same.
If a stock motor is rated at 400hp, and another has 500, and both have a 15% lose but go through the same drive train.. The 400hp car would put out 340rwhp losing 60 hp and the 500hp car would put out 425rwhp losing 75hp.. even though the drive train is the exact same.
Pro
Joined: Oct 2005
Posts: 738
Likes: 2
From: Richmond VA
How are percentages accurate in these cases? I have always wondered...
If a stock motor is rated at 400hp, and another has 500, and both have a 15% lose but go through the same drive train.. The 400hp car would put out 340rwhp losing 60 hp and the 500hp car would put out 425rwhp losing 75hp.. even though the drive train is the exact same.
If a stock motor is rated at 400hp, and another has 500, and both have a 15% lose but go through the same drive train.. The 400hp car would put out 340rwhp losing 60 hp and the 500hp car would put out 425rwhp losing 75hp.. even though the drive train is the exact same.
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Pro
Joined: Jan 2007
Posts: 599
Likes: 1
From: Katy Texas
How are percentages accurate in these cases? I have always wondered...
If a stock motor is rated at 400hp, and another has 500, and both have a 15% lose but go through the same drive train.. The 400hp car would put out 340rwhp losing 60 hp and the 500hp car would put out 425rwhp losing 75hp.. even though the drive train is the exact same.
If a stock motor is rated at 400hp, and another has 500, and both have a 15% lose but go through the same drive train.. The 400hp car would put out 340rwhp losing 60 hp and the 500hp car would put out 425rwhp losing 75hp.. even though the drive train is the exact same.
if a 200hp motor was hooked to a C5 drivetrain would it be reasonable to only make 140rwhp? thats the "60hp" loss that a Z06 has.
thats the way i look at it, but i can see your point
Melting Slicks
Joined: Sep 2005
Posts: 2,521
Likes: 146
From: Watertown CT
Think of it this way, the 400hp engine, on a dyno run, for example, say it took 10 seconds to get threw the 4th gear pull, well the 500hp engine took 8 seconds, the 500 hp is working harder, creating more friction, move more fluid in a shorter period of time which is where the percentage of loss comes in. I'm sure if you take the 400hp engine and cruise at a steady speed, and the 500hp engine and cruise at a steady speed, the loss there is the same. It's all under stress, the more hp, the higher the stress, the more hp lost. Hope that helps
Le Mans Master
Joined: Feb 2004
Posts: 8,629
Likes: 16
From: York PA
Think of it this way, the 400hp engine, on a dyno run, for example, say it took 10 seconds to get threw the 4th gear pull, well the 500hp engine took 8 seconds, the 500 hp is working harder, creating more friction, move more fluid in a shorter period of time which is where the percentage of loss comes in. I'm sure if you take the 400hp engine and cruise at a steady speed, and the 500hp engine and cruise at a steady speed, the loss there is the same. It's all under stress, the more hp, the higher the stress, the more hp lost. Hope that helps
And while moving the higher HP car will be going faster creating more wind drag losing more hp than the lesser slower HP car
Thats also what I remember when this Question was asked before
