Author Topic: DYNO  (Read 2868 times)

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Offline reality

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DYNO
« on: August 28 2020, 11:08:33 AM »
If you have a NA car on a dyno, will the numbers be different according to tire height? If so, why and how?
Tire weights assumed equal.

Offline Steve Wood

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Re: DYNO
« Reply #1 on: August 28 2020, 01:21:48 PM »
...
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Offline nocooler

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Re: DYNO
« Reply #2 on: August 28 2020, 10:44:53 PM »

That's like asking if a bias-ply will dyno different than a radial. 
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Offline reality

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Re: DYNO
« Reply #3 on: August 28 2020, 11:20:00 PM »
Apparently the further the weight is from the center the more torque it uses to spin the tire.
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Offline ULYCYC

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Re: DYNO
« Reply #4 on: August 29 2020, 07:41:32 AM »
Tire/wheel weight would have more effect unless the tire size is a radical difference.  Air density from time of day would have more effect on results. 
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Offline reality

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Re: DYNO
« Reply #5 on: August 29 2020, 08:20:47 AM »
Thanks Guys ,
the number being thrown around is 20hp from 17 to 19 in rim.


Is this true?
A 4.0-1 rear gear with a 26 in tire.
Add 10% to the tire and  10% to the tire
4.4 gear 28,6 tire equals the same hp torque?
why or why not?

Offline ULYCYC

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Re: DYNO
« Reply #6 on: August 29 2020, 09:59:41 AM »
I doubt 20hp unless a major weight difference between tire and rim. 
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Offline daveismissing

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Re: DYNO
« Reply #7 on: August 29 2020, 05:40:16 PM »
I would think you are right if you have a 10% larger tire but shift the diff gears by 10% this should be neutral?
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Offline reality

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Re: DYNO
« Reply #8 on: August 30 2020, 12:45:09 AM »

Offline ULYCYC

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Re: DYNO
« Reply #9 on: August 30 2020, 09:00:12 AM »
Dyno results are tested in  final drive  1to 1 in 3rd gear  or what ever your final 1 to 1 gear is.  Changing tire height, rim size or footprint  can all be lost accelerating from 1st gear to the final drive 1 to 1 street driving.   19" rims may look cool but suck trying to get out of the hole with a car that has any type of power.  That few HP gain that's still in a given margin of error doesn't mean squat in real word driving.   Taking the car to the track and change  tires, tune, fuel, carb/turbo and chassis will give you more useful data and results.
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