07-01-2009, 10:12 PM | #29 | |
Camaro Owner Soon!
Drives: Chevrolet Cobalt SS/SC S2 GMPP Join Date: Jan 2009
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Get my drift? Only compare cars that are close to the same weight and have the smae types of motors and drivetrains. |
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07-01-2009, 10:37 PM | #30 | |||||
Booooosted.
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07-01-2009, 11:11 PM | #31 | |
Drives: 2010 Hyundai Genesis Coupe 2.0T Join Date: Dec 2008
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EDIT: See it's a 350. Yeah, it's .2/.3 seconds off from the SS' 0-60 but I don't know about the negative effect the 21" wheels have on performance. |
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07-01-2009, 11:25 PM | #32 | |
Booooosted.
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And yes the IS350 is really quick but she shouldn't beat me by 9 car lenths. |
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07-01-2009, 11:35 PM | #33 | |
Drives: 2010 Hyundai Genesis Coupe 2.0T Join Date: Dec 2008
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07-01-2009, 11:39 PM | #34 | |
Booooosted.
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But yup, about 100 feet. Not sure how far we raced but i had a buddy drive hers and we got a simultanious jump. Was over 1/4 mile cause I was doing 120 when I started breaking. |
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07-02-2009, 02:17 AM | #35 | |
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07-02-2009, 03:17 AM | #36 |
Booooosted.
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Only about 60 lbs. heavier. Not gonna be much of a measurable difference. At least not a full second.
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07-02-2009, 08:38 AM | #37 | |
Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008
Location: S.W. Florida
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Each wheel is 15 lbs heavier? If that's true, that's a huge difference in rotating mass. The larger diameter wheels also move that rotating mass further out, even when using tires with the same outside diameter as stock. So your car will definately be affected by this. And my guess is it would run several tenths slower down a 1/4 mile track. I've read many different things about rotating mass. I heard anywhere from a 1-2 ratio all the way to a 1-10 ratio. Basically each 1lb of ratating mass added needs to be multplied. So the overall weight added to the vehicle is much more than just the original increase in rotating mass. I chatted with a guy that went from 38 lbs (stock wheels) to 43 lbs (aftermarket wheels) and he said there was a noticeable difference in his car's performance (didn't give me any specific numbers). But his said he could tell his car was noticably slower. And that's with only 5 lbs per wheel (20 lbs total) of rotating mass. Your car still shouldn't be running 7.0 sec, 0-60mph, but it will definately be negatively affected 0-60mph and 1/4 mile. |
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07-02-2009, 08:40 AM | #38 | |
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07-02-2009, 09:20 AM | #39 | |
Drives: 5.4 3v Join Date: May 2009
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Rotational, unsprung weight is a bish. |
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07-02-2009, 09:34 AM | #40 | |
Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008
Location: S.W. Florida
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If your worried about performance (drag racing), I'd go with the lightest wheel possible (but it needs to be strong enough), and stay with the original wheel diameter (stay away from + plus sizes). But the real light weight wheels can get expensive. There's lots of good wheels out there. In a racing forum,I read a comment from a 34 time NHRA Champ that said he ran .5 (1/2 second) slower in the 1/4 mile, when he added wheelsthat weighed 20 lbs more each (80 lbs increase in rotating mass). That just shows how much of an effect a small increase in rotating mass can affect a cars performance. Why did he put the heavier wheels on his car. They were a present from his son (17'' Konig wheels). So he put them on his car and took it to the track and it ran .5 sec slower than it used to run. |
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07-02-2009, 09:35 AM | #41 |
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Drives: 2012 Cruze LT Join Date: Mar 2009
Location: Indiana
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15lbs a wheel and 21 inch wheels is going to have more impact on performance than you think. Probably not the full second, but certainly you will not be getting the advertised times from GM. Having said that, I still believe the problem is in the PCM/TCM tuning.
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07-02-2009, 09:39 AM | #42 | |
Booooosted.
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My freind went up from 16" wheels to 19" wheels on his 300Z and actually said he felt it was faster. The times were identical to before the swap but I gaurantee his wheels were heavier than previous. Maybe a circumfrance difference negating the would be ill effect on his but I don't beleive my wheels will slow the car down. |
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