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L18_B110
Re: Tyre Size and Horsepower
#1
No life (a.k.a. DattoMaster)
Joined:
2002/8/6 2:24
From Brisbane, Australia
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Posts: 3792
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Quote:

Datsun1000 wrote:
Hi Guys,

Can tyre size affect rear wheel horsepower?

The basis of the question

If you put a car on a Dyno and perform a run and then chage the tyre size up to a larger overall size, will the rear wheel horsepower change.
excluding the very small fraction of a friction increase by the larger tyres.

Cheers Guys,

A link to proof or actual mathmatical proof for a yes or no answer would be appeciated.


no, tyre diametre will not affect bhp on a dyno. tyre diametre is just another form of gearing. and gears are torque multipliers. a taller tyre (or gear) will mean less torque (tractive effort) at the wheels, but they will be turning at a proportionately higher speed, so no net change to the power. eg change to a 10% larger tyre will make 10% less torque, but it will be going 10% faster at the same time, so it all balances out.

power = torque * speed / a constant


Posted on: 2006/8/9 3:58
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Transfer the post to other applications Transfer

Subject Poster Date
     Tyre Size and Horsepower Datsun1000 2006/8/9 0:56
       Re: Tyre Size and Horsepower Tyrie 2006/8/9 2:31
         Re: Tyre Size and Horsepower B120dat 2006/8/9 2:38
           Re: Tyre Size and Horsepower ddgonzal 2006/8/9 3:08
           Re: Tyre Size and Horsepower benny 2006/8/9 3:24
             Re: Tyre Size and Horsepower Datsun1000 2006/8/9 3:55
       Re: Tyre Size and Horsepower L18_B110 2006/8/9 3:58
         Re: Tyre Size and Horsepower Datsun1000 2006/8/9 4:16
           Re: Tyre Size and Horsepower L18_B110 2006/8/9 5:14
             Re: Tyre Size and Horsepower Datsun1000 2006/8/9 6:22
               Re: Tyre Size and Horsepower Mildman 2006/8/9 7:07
                 Re: Tyre Size and Horsepower Datsun1000 2006/8/9 7:25
                   Re: Tyre Size and Horsepower BUNDY351 2006/8/9 8:08
                     Re: Tyre Size and Horsepower R-fastmotorsport 2006/8/9 8:45
                       Re: Tyre Size and Horsepower rev210 2006/8/9 12:16




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