Subject	Re: Will a larger diameter wheel affect the outcome of Dyno test
Posted by	Cosmik Debris on May 10, 2004 at 5:37 PM
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In Reply To	Will a larger diameter wheel affect the outcome of Dyno test posted by Red Baron Z on May 10, 2004 at 12:33 PM
Message	:lets say a 15inch wheel to a 18 inch wheel,any difference in hp? thnak If you change the diameter of the rear wheel you will change the gearing. Changing the gearing changes the amount of torque but since the RPM also changes the net effect is to keep the HP constant (ignoring losses). HP = 2*Pi*N*T/33000 Torque is the twisting force and is affected by the length of the torque arm. HP is the amount of torque per unit time and the time is essentially the RPM. Lowering the gearing for example reduces T (the torque) but increases N (the RPM) this conspires to keep the HP constant as all the other terms in the equation are constants.
Follow Ups	Will a larger diameter wheel affect the outcome of Dyno test - Red Baron Z 12:33:21 05/10/04 On a dynojet or any other roller type yes - PEwithaZ 12:41:49 05/10/04 Ive herd... - Jason300zxTT(NoVA) 12:43:42 05/10/04 Wheel diameter does not matter, TIRE diameter does. - Chip(GMS Racing) 12:49:59 05/10/04 Chip is almost right........ - Greg D. (Specialty-Z) 13:28:32 05/10/04 Damn 19's (n/m) - Red Baron Z 13:46:15 05/10/04 Question for you Greg. Dynoning this weekend -> - Z-Jay (Edmonton, AB) 16:08:15 05/10/04 Yes on tire diameter, but very minimal. - Bigplansnocar (UTAH) 12:56:00 05/10/04 Similar question I was going to post on diameters v hp - MaTT (90TT) 13:23:59 05/10/04 wait... - MaTT (90TT) 13:26:33 05/10/04 Give it a minute, they're on lunch. =) (n/m) - ZCar91TT (Dothan, AL.) 13:31:05 05/10/04 Hopefully the tire diameter would be the same. - Marshall 15:04:09 05/10/04 Re: Will a larger diameter wheel affect the outcome of Dyno test - Cosmik Debris 17:37:48 05/10/04
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