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Old 04-29-2004, 09:51 AM
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Chassis Dyno Question

Hey Everyone-
I've been thinking about this for a while, and since I have no dyno experience, I was wondering if anyone knew. Since gears increase torque, would it be visable on a dyno read out (chassis of course). Say you did a run with 3.50 gears in the rear, then switched em out for a set of 4.11's. I know you would feel the torque difference, and see it on 1/4 mile slips, but would you see it on the dyno?

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Old 05-05-2004, 03:31 PM
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Does nobody know, or was it that stupid of a question?...
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Old 05-05-2004, 03:34 PM
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If the dyno was measuring at the wheel (like a Chassis Dyno) then yes - you would see them reported. On an engine dyno, no.

68
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Old 05-05-2004, 04:01 PM
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Cool. Thanks for letting me know 68Impala. I've been wondering that for some time now. So that means that you can run your motor on an engine dyno, and then run it on a chassis dyno when it's in the car, and the #'s would be lower in HP, but could be higher in torque? I guess I'm asking how much of a difference does it make?
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Old 05-05-2004, 11:34 PM
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no because they're mathematical derivatives of one another.

K
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Old 05-16-2004, 08:35 PM
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Chasis dyno numbers are quite differant than engine dyno numbers. The rear gear does not make as much differance as some other variables. Loose race type torque converters consume a lot of hp on the chassis dyno also a car will make less wheel hp with slicks than with street tires. So you could install the same motor in two differant cars and get totaly differant hp numbers and the suprise is the one that shows less wheel hp could be faster than the more powerful reading car. Basicly what I have learned about chassis dynos is that they are good for tuneing and they are not a really good indicator of a cars performance potental. I have seen cars that make 500 rwhp go low 6 second eigth mile times carrying 3400 pounds and I have seen 700 and 800 rwhp cars that are much slower it all comes down to how you use your engines power.
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