All else being equal (WHP, TQ, Weight, etc) Would a AWD car be "slower" than a FWD or RWD car?(More)
11-29-2006, 04:54 AM
#1
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All else being equal (WHP, TQ, Weight, etc) Would a AWD car be "slower" than a FWD or RWD car?(More)
I've been discussing different scenarios with a couple of (what I consider) knowledgeable car people and I've heard from two of them that "drive train loss" affects the same on the Dyno than on the asphalt; thus a 450awhp will be slower than say a 450rwhp car. Obviously we are taking traction out of the equation. If true well that sucks because we will always have to generate more power to be just as fast as any other 2WD. On the other hand, could we "disconnect" the rear axle of our cars and have say.....lower FATS??? Higher trap times???
I don't know but I though it would always be an advantage to have same WHP in AWD than in 2WD. Because a more powerful engine (BHP) would always yield more speed (again all else being equal).
Discuss.....
Any links to a good article??
TIA
I don't know but I though it would always be an advantage to have same WHP in AWD than in 2WD. Because a more powerful engine (BHP) would always yield more speed (again all else being equal).
Discuss.....
Any links to a good article??
TIA
11-29-2006, 05:05 AM
#3
by definition, they'd be exactly the same.
since the WHP is the same.
Power is the measurement of work over time, and since they weigh the same, they can move the same mass at the same rate.
Power is the measurement of work over time, and since they weigh the same, they can move the same mass at the same rate.
11-29-2006, 05:11 AM
#4
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Very marginally slower
There'd be extra drivetrain losses due to the friction and rotating mass of the two extra diffs. That's a very small difference though.
For an AWD car, dynos are like the road but without wind resistance. For RWD, there is about half of the parasitic loss on a dyno as there is on the road.
Between the transmission and the ground, the largest drivetrain loss comes from spinning the wheels & brakes. On a dyno, a RWD car only has to do this for two wheels. On the road, all cars, regardless of drivetrain, have to spin all four wheels and brakes.
Make sense?
For an AWD car, dynos are like the road but without wind resistance. For RWD, there is about half of the parasitic loss on a dyno as there is on the road.
Between the transmission and the ground, the largest drivetrain loss comes from spinning the wheels & brakes. On a dyno, a RWD car only has to do this for two wheels. On the road, all cars, regardless of drivetrain, have to spin all four wheels and brakes.
Make sense?
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11-29-2006, 05:18 AM
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Yes but the AWD engine would have to be more powerful to attain the same WHP....Correct? Thus.
<ul><li><a href="https://forums.audiworld.com/s4/msgs/2537445.phtml">Thus</a></li></ul>
11-29-2006, 05:20 AM
#10
sure, ignoring traction...if two cars were tuned for exaclty the same WHP...
then you reduce the drivetrain losses on one car, then that car would be faster (ignoring traction).
(because afterwards, the WHP would be unequal)
(because afterwards, the WHP would be unequal)