Power/weight ratios?
Launching!
Joined: Dec 2003
Posts: 246
Likes: 0
From: Texas, dont mess with us!
Colonel,,, how did you come up with those numbers.
Flywheel HP to the wieght of your car with driver or without?
-or-
Rwhp to the weight of your car with or without driver?
--did you use torque for any figures?
Curious to know becuase my car is 2800 without driver, 2950 with, and 570rwhp, so maybe 630 flywheel hp? Whats the % of loss from flywheel to the rears? i know it can depend on the dyno,, but whats the average% loss?
Using flywheel hp and wieght without driver my ratio is 4.44lbs to 1 hp
That sound correct? If so,,,
Flywheel HP to the wieght of your car with driver or without?
-or-
Rwhp to the weight of your car with or without driver?
--did you use torque for any figures?
Curious to know becuase my car is 2800 without driver, 2950 with, and 570rwhp, so maybe 630 flywheel hp? Whats the % of loss from flywheel to the rears? i know it can depend on the dyno,, but whats the average% loss?
Using flywheel hp and wieght without driver my ratio is 4.44lbs to 1 hp
That sound correct? If so,,,
Last edited by v8-7; Jul 19, 2004 at 06:30 PM. Reason: fawked up
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
As I said, "HP, not RWHP".
The weight I used was the actual raceweight (that means, with driver, helmet, laptop, gas, change in the center console, dirt, etc....)
The drivetrain loss (which actually IS NOT a fixed percentage) is *generally* about 83-88% (again, if you want to *call* it a percentage) with an auto and about 80-85% with a manual.
If we have 570 RWHP and assume 88% then that gives you 648 HP at the crank. 2950 lb/648 HP= 4.55:1
The weight I used was the actual raceweight (that means, with driver, helmet, laptop, gas, change in the center console, dirt, etc....)
The drivetrain loss (which actually IS NOT a fixed percentage) is *generally* about 83-88% (again, if you want to *call* it a percentage) with an auto and about 80-85% with a manual.
If we have 570 RWHP and assume 88% then that gives you 648 HP at the crank. 2950 lb/648 HP= 4.55:1
Teching In
Joined: Jul 2004
Posts: 18
Likes: 0
Originally Posted by tigris
Assuming you have enough traction/suspension setup, What power/weight ratio will get you into 10's or 9's? Would 5 lbs to 1 hp be enough run solid nines? Thanks
Here is the easy way to play around with the numbers without all the math - plus its free.
http://www.virtualengine2000.com/ProgramDownload.htm
