AWD/2WD dyno differences?
05-12-2004, 02:16 AM
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AWD/2WD dyno differences?
I feel dumb asking this question, but I'm not sure how a awd works? In the past, I have only delt with 2 wheel drive dynos. I know that it hooks up to all four wheels, but how does it actually measure the hp? Thanks!
05-12-2004, 06:23 AM
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Car Info: 2002 Honda S2000
On a dynamometer you apply a load to the floored engine and measure the load the engine can handle at different engine speeds. You might hook an engine to a dynamometer, floor it and use the dynamometer to apply enough of a load to the engine to keep it at, say, 7,000 rpm. You record how much load the engine can handle. Then you apply additional load to knock the engine speed down to 6,500 rpm and record the load there. Then you apply additional load to get it down to 6,000 rpm, and so on. You can do the same thing starting down at 500 or 1,000 rpm and working your way up. What dynamometers actually measure is torque (in pound-feet), and to convert torque to horsepower you simply multiply torque by rpm/5,252.
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05-12-2004, 03:10 PM
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the question was on dyno differances. you need to have a dyno that will be able to load both front and rear axils at the same time. look for shops that work on awd/fwd vehicles. the horsepower and torque readings will be lower because of all the drive train losses. you would need to remove the motor and mount it to a dyno stand to get engine power readings. most dynos are now computer run and will give you the readings as the run is being done.
05-13-2004, 01:55 AM
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Originally Posted by qship
the question was on dyno differances. you need to have a dyno that will be able to load both front and rear axils at the same time. look for shops that work on awd/fwd vehicles. the horsepower and torque readings will be lower because of all the drive train losses. you would need to remove the motor and mount it to a dyno stand to get engine power readings. most dynos are now computer run and will give you the readings as the run is being done.
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