Increase wheel hp?
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Increase wheel hp?
Okay, this is about racing wheels, but I figured it had more to do with engines and horsepower than the actual wheels.
Would lightweight racing wheels increase your wheel horsepower? I thought of this because the wheel hp is just a measurement of hp with drivetrain loss, and the wheels are a part of the drivetrain, right?
Is this a valid point? Or have I stayed up too late again? lol
Mav
Would lightweight racing wheels increase your wheel horsepower? I thought of this because the wheel hp is just a measurement of hp with drivetrain loss, and the wheels are a part of the drivetrain, right?
Is this a valid point? Or have I stayed up too late again? lol
Mav
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check this out,
its not neccesarily the weight of the rim:
Some may wonder if it was the weight or the size difference that caused the power loss. It is both. Being bigger, more effort is required to turn the wheel. The effective gear ratio of the car is altered, meaning slower pick up and much more difficulty in getting the car to chirp the gears. Being heavier also means more effort is needed to turn the wheel. The extra weight makes the car struggle more at the moment of inertia and use more power to keep the drive wheels turning.
Basically meaning if the new tire is slightly taller than the stock tire then you will loose a little bit of whp.
A 1.75 inches bigger in circumference (aprox 1/2 inch in height) can me a total of 3.8hp in top hp and close to 6hp in the some of the pther rpm ranges.
185R70-13 205ZR40-17
29 lbs. 38.5 lbs
113.6 hp 109.8 hp = 3.8hp loss
[ March 10, 2002, 11:29 PM: Message edited by: SCCA 01 Elantra ]
its not neccesarily the weight of the rim:
Some may wonder if it was the weight or the size difference that caused the power loss. It is both. Being bigger, more effort is required to turn the wheel. The effective gear ratio of the car is altered, meaning slower pick up and much more difficulty in getting the car to chirp the gears. Being heavier also means more effort is needed to turn the wheel. The extra weight makes the car struggle more at the moment of inertia and use more power to keep the drive wheels turning.
Basically meaning if the new tire is slightly taller than the stock tire then you will loose a little bit of whp.
A 1.75 inches bigger in circumference (aprox 1/2 inch in height) can me a total of 3.8hp in top hp and close to 6hp in the some of the pther rpm ranges.
185R70-13 205ZR40-17
29 lbs. 38.5 lbs
113.6 hp 109.8 hp = 3.8hp loss
[ March 10, 2002, 11:29 PM: Message edited by: SCCA 01 Elantra ]
Thread Starter
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Yeah, I get what you are saying. I already knew that putting 18's on a car would really slow it down, and mess up the gear ratios. I was just curious if, on a dyno, the car in question with racing rims would register a higher whp than if it had regular rims. That's all I was curious about.
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From: Rancho Palos Verdes, CA
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As long as the circumfrence of the wheel/tire combo is the same, 22" or 13" will not change your gearing.
However, lighter wheels are easier to turn, and should show a "gain" in acceleration times, and on a dyno. Just like a lighter weight flywheel would.
However, lighter wheels are easier to turn, and should show a "gain" in acceleration times, and on a dyno. Just like a lighter weight flywheel would.