What difference do wheels make in acceleration?
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From: Tucson, AZ USA
Originally Posted by 1Ferris,Mar 19 2006, 02:27 PM
I would also guess that they are making quite a bit more power than the S and can afford the extra rotational mass. Whereas with 140-160 torque we need to be a bit more choosy.
I will be replacing the stock wheels on my AP1 with 17" Enkei RPF1's and I will put similar tires (grip/width/OD) on them and do an actual comparison on a track to get some reall data. I am actually curious myself.
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From: Durango, Colorado
Somebody has probably already covered this, but if you up-size your rims, you need to down-size your tire sidewalls to keep the tire diameter about as it was. If you go larger, you will hurt acceleration.
Thanks,
Richard
Thanks,
Richard
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Surprised no one has brought the 'gears' comparison up.
Going to 16's [keeping proportional total wheel/tire diameter aka less than 17's total diameter] is about at 4.44's.
Similar comparison going to 15's would be like 4.77's.
As mentioned, you have to be careful with tire selections to keep handling consistent and from having too high of a sidewall.
Going to 16's [keeping proportional total wheel/tire diameter aka less than 17's total diameter] is about at 4.44's.
Similar comparison going to 15's would be like 4.77's.
As mentioned, you have to be careful with tire selections to keep handling consistent and from having too high of a sidewall.
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From: St-Redempteur,Qc.
Originally Posted by SilverKnight,Mar 19 2006, 04:38 PM
thanks! I know brand new from AJ and he helped deliver them 
what rims you got? 
what rims you got? 
Not as nice as your's,but I don't have your money;life is a bitch.!!!
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From: St-Redempteur,Qc.
Originally Posted by SilverKnight,Mar 19 2006, 11:44 PM
still the volk look good on s2k
Yeh and they do come in 17s also. The 18s just make the S look sooooooooooooooooo good!
look good on s2k Yeh and they do come in 17s also. The 18s just make the S look sooooooooooooooooo good!
Post some pics,when you can.!!! Here are mine:
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Originally Posted by Project22a,Mar 18 2006, 02:08 PM
For every 1lb you add in weight to your wheels, you effectively add 8lbs in unsprung/static weight. For example, if 1lb was added to each of the four corners of your car, it's like adding an extra 32lbs. And this isn't even putting into account rotational mass yet (when upgrading to larger diameter wheels), where the weight effect rises exponentially.
Probably more than you guys wanted to know, but it's never a bad to get a quick physics refresher.
Probably more than you guys wanted to know, but it's never a bad to get a quick physics refresher.
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From: 17 ft below sea level.
RobZ Posted on Mar 19 2006, 10:41 PM
Cool
Keep us up to date on that!
I will be replacing the stock wheels on my AP1 with 17" Enkei RPF1's and I will put similar tires (grip/width/OD) on them and do an actual comparison on a track to get some reall data. I am actually curious myself.
Keep us up to date on that!
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From: Gie
Originally Posted by Project22a,Mar 18 2006, 05:08 PM
For every 1lb you add in weight to your wheels, you effectively add 8lbs in unsprung/static weight. For example, if 1lb was added to each of the four corners of your car, it's like adding an extra 32lbs. And this isn't even putting into account rotational mass yet (when upgrading to larger diameter wheels), where the weight effect rises exponentially.
Probably more than you guys wanted to know, but it's never a bad to get a quick physics refresher.
Probably more than you guys wanted to know, but it's never a bad to get a quick physics refresher.
You want physics? How about kinetic dynamics?
For Mass Moment of Inertia:
M = 2*pi*R*ro*A
where
M = mass
R = mean radius
ro = density
A = effective cross sectional area
pi = 3.1415926535858 (from memory)
I (Mass Moment of Inertia) = MR^2
For Angular Acceleration:
A = M/I
where
M = moment
I = mass moment of inertia
Take two objects being subjected to the same moment (torque). If one has double the mass moment of inertia, it will accelerate at exactly half the rate of the other.
Inertia bad.
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