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Old 07-14-2004, 02:05 PM   #11
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Quote:
Originally Posted by Nytro67
going from stock 60/16s to 245/18s is only a millimeter different. there is no loss of acceleration b/c of increased mass. the radius from the center of the hub to where the tire meets the ground is still the same size. you would lose acceleration if you ran a larger tire size but then also your speedometer would be off and you would have to get your PCM reprogrammed for it to work correctly and you amy have problems with rubbing in your wheel well.
There may be slightly more road feel but thats what i want when driving a sports car. it handles much better around turns as there is not as much rubber folding under plus i went from 225s to 245s wich helps. i never leave the performance mode for suspension anyway. If i want a comfortable ride, i can still switch to normal mode and it floats like a boat.

i think the bonnes look phat with 18s on them.
You lose acceleration due to the higher rotating mass beause you have more rim. Unless you got super light 18'* that weighed less than your previous size your going to lose acceleration.
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Old 07-14-2004, 02:09 PM   #12
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oops, thats supposed to say 60/16'* to 45/18'*...
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Old 07-14-2004, 02:28 PM   #13
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Quote:
Originally Posted by Rogue
You lose acceleration due to the higher rotating mass beause you have more rim. Unless you got super light 18'* that weighed less than your previous size your going to lose acceleration.
Oh, your talking about weight?
So we should say that going to a heavier rim will slow you not larger. My 18'* are almost 2 pounds lighter then my 16s. those gold diamond lace wheels are very solid. my new wheels hardly have anything in the middle.
And if you think of it in that respect, having my golf clubs or a second passenger in the car slows me down. My audio system, the dead bodies in my trunk, etc...
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Old 07-14-2004, 02:30 PM   #14
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Quote:
Originally Posted by Nytro67
Quote:
Originally Posted by Rogue
You lose acceleration due to the higher rotating mass beause you have more rim. Unless you got super light 18'* that weighed less than your previous size your going to lose acceleration.
Oh, your talking about weight?
So we should say that going to a heavier rim will slow you not larger. My 18'* are almost 2 pounds lighter then my 16s. those gold diamond lace wheels are very solid. my new wheels hardly have anything in the middle.
And if you think of it in that respect, having my golf clubs or a second passenger in the car slows me down. My audio system, the dead bodies in my trunk, etc...
Its not just weight, its the weight moved towards the outside of the tire. 18'* have a larger outer rim diameter so weight is multiplied giving you a larger rotating mass. Trust me, if you have 18'* your slower than someone with 16s off the line with same car weight and power.
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Old 07-14-2004, 02:44 PM   #15
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so your saying that the tire, which is 15 mm shorter than stock and lighter, makes no difference in the rotating mass, only the wheel? and although my wheels themselves are lighter then my stock 16s, i'm still gonna be slower? i would like to trust you but i would need to see it in a formula to believe it. in which case, i would have to weigh a tire and a wheel seperately then mounted from each set to plug into the formula which sounds entirely like too much work.
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Old 07-14-2004, 03:13 PM   #16
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Quote:
Originally Posted by Nytro67
so your saying that the tire, which is 15 mm shorter than stock and lighter, makes no difference in the rotating mass, only the wheel? and although my wheels themselves are lighter then my stock 16s, i'm still gonna be slower? i would like to trust you but i would need to see it in a formula to believe it. in which case, i would have to weigh a tire and a wheel seperately then mounted from each set to plug into the formula which sounds entirely like too much work.
The weight of the tire and the outer rim is further out from the hub of the wheel. Think of a weight tied to a string spinning from a point. Now lengthen the string. It takes more power to get it rotating the same speed as the same weight on a shorter string.
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Old 07-14-2004, 03:44 PM   #17
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The wheel itself makes more of a difference than the tire. Ever see a launch in slo-mo? The rotating mass is the wheel. The tire gives much more, thus transferring some of the power back to the rim. Why do you think dragsters have 15" rims and more rubber?
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Old 07-14-2004, 05:28 PM   #18
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hold on, im thinking.
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Old 07-14-2004, 05:29 PM   #19
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hold on, im thinking.
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Old 07-14-2004, 05:46 PM   #20
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North American Misconception = Sports cars need a jarring stiff ride to turn well.

No, you can have a car that can just FLY in corners and still be comfy.

18'* will make your ride stiffer, you might gain some handling, at the expense of acceleration, and braking. You really should upgrade something on the stoppers if going to 18+.
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