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Old 05-15-2008, 02:20 AM   #1
GreenMarine
Scooby Guru
 
Member#: 36080
Join Date: Apr 2003
Chapter/Region: South East
Default Wheel weight vs. Wheel HP/Tq??

Anyone know of a spreadsheet to help calculate how much of a difference I should see with my Autocross wheels and tires on vs. my standard street wheels and tires??

I have the wheel and tire weights for both...

Street

18" ICW Trident D7 wheels = 23.5lbs
Kumho MX tires (225/40/18) = 22lbs
TOTAL = 45.5lbs each * 4 = 182lbs (all four)

Autocross

16" Mazda RX-7 FD wheels = 14 lbs
Falken Azenis RT-615 (225/50/16) = 23.5
TOTAL = 37.5lbs each * 4 = 150lbs (all four)

I looked online for a while but became frustrated before long... Anyone have any input??

~ Chris
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Old 05-15-2008, 02:22 AM   #2
GreenMarine
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Default

*Side Note*

With the Street wheels and tires on, the SVX made 191lb/ft wheel tq and 186 whp at a dyno day in Wilmington, NC a few months ago...

~ Chris
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Old 05-15-2008, 09:54 AM   #3
jaxscuby
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2002 USDM WRX
WRB

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i did the calculations one day when i was bored.
search in jax mod squad...conservation of energy..
brings back horror storys of physics 1..

if i get bored today before lunch i might just
make a spread sheet..but it may cause brain damage..
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Old 05-15-2008, 12:09 PM   #4
jaxscuby
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2002 USDM WRX
WRB

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conservation of energy..

potential energy + kinetic energy

looking through my hand held for the formulas..
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Old 05-15-2008, 01:03 PM   #5
Scooby South
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Location: 2013 Limited SWP BRZ and a
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99 Ver6 Recreation
JDM Speedwagon 3 LSDs..:)

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Holy Math problem Chris....but you have jaxscuby(math wizard extraordinare) work on it...which BTW he loves for the challenge of the brain...


Bill
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Old 05-15-2008, 01:13 PM   #6
ritky
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Join Date: Oct 2004
Chapter/Region: South East
Location: Stalking Scoobydoll
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2003 WRX PSM w/FXHID
FLA Turnpike > I-95

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There's one for a flywheel but maybe you can change it for wheels maybe?

http://www.wallpaperinstaller.com/scooby/flywheel.xls

From this thread
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Old 05-15-2008, 05:39 PM   #7
prometheum
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04 bicycle!

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are you talking about how much loss at the wheels you are going to see depending on how heavy your wheels are? it also depends on how the weight is distributed across the wheels. if its closer to the center then you will see less loss, if more weight is towards the edges there will be more loss
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Old 05-15-2008, 05:44 PM   #8
GreenMarine
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Quote:
Originally Posted by Scooby South View Post
Holy Math problem Chris....but you have jaxscuby(math wizard extraordinare) work on it...which BTW he loves for the challenge of the brain...


Bill
It's not that hard to work out, I have just forgotten how to do it ... but hopefully Jax can help out alittle

~ Chris
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