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      07-09-2009, 05:06 PM   #23
MVEED3
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Let's call mythbusters! I'll offer up my car for a little screen time.


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      07-09-2009, 05:07 PM   #24
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Sorry about that, the bolded part was not me yealling or getting upset a all. Sorry it came off as such.

I've had all these 'discussions' with other engineers before, and the bottom line is that they cannot prove a larger wheel within the same rolling diameter is a detrement on performance. (in any significant way)

This falacy is way overblown on the internet. People need to understand that a blanket statmement about 20" wheels hindering your performance is nearly impossible to prove. Yet the masses still think it's somehow set in stone...
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      07-09-2009, 05:08 PM   #25
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Quote:
Originally Posted by Lemans_Blue_M View Post
Sorry about that, the bolded part was not me yealling or getting upset a all. Sorry it came off as such.

I've had all these 'discussions' with other engineers before, and the bottom line is that they cannot prove a larger wheel within the same rolling diameter is a detrement on performance. (in any significant way)

This falacy is way overblown on the internet. People need to understand that a blanket statmement about 20" wheels hindering your performance is nearly impossible to prove. Yet the masses still think it's somehow set in stone...
OK. It's cool. I now have a better understanding of where you are coming from. Cheers man.
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      07-09-2009, 10:37 PM   #26
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Hey guys, I'm thinking about putting some chrome 24s on my car. I'll have to raise it a bit but will that hurt my acceleration?
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      07-09-2009, 11:17 PM   #27
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Quote:
Originally Posted by Donbona View Post
Here is a question.... if you stick 20inch rims on your car will your acceleration be slower than normal??
geeezzzzzz
look what you started lol

who really cares? if you want bigger/nicer wheels. go for it. it will be a very small difference...(same difference as driving with a full tank or an empty tank)
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      07-09-2009, 11:56 PM   #28
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And I still have my mind set on 18" wheels for performance. I think the 19" wheels are a bit on the big side so 20" wheels for me are out of the question.
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      07-10-2009, 09:19 AM   #29
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And I still have my mind set on 18" wheels for performance. I think the 19" wheels are a bit on the big side so 20" wheels for me are out of the question.
18s are cool for the track or winter use (thats the only place I use them) aka performance wise its cool to have.

But if your talking about everyday then I think 19s are a minimum, 20s if you wanna look

18s are wayyyy too small for a car the size of the M3 in my opinion
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      07-10-2009, 11:37 AM   #30
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Originally Posted by slammedm3 View Post
18s are wayyyy too small for a car the size of the M3 in my opinion
It's always hard to go backwards once you throw on a set of larger wheels. On my last M3, I ended up selling the stock wheels because I'd never throw them on for the track like I intended.


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      07-10-2009, 01:12 PM   #31
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Quote:
Originally Posted by Lemans_Blue_M View Post
Sorry about that, the bolded part was not me yealling or getting upset a all. Sorry it came off as such.

I've had all these 'discussions' with other engineers before, and the bottom line is that they cannot prove a larger wheel within the same rolling diameter is a detrement on performance. (in any significant way)

This falacy is way overblown on the internet. People need to understand that a blanket statmement about 20" wheels hindering your performance is nearly impossible to prove. Yet the masses still think it's somehow set in stone...
Well, the obvious couterpoint is this statement:

I think it will be exceptionally rare (more like impossible) that all things equal (width, wheel style, tire type, etc.) that you can find any +1 combination that has less moment of inertia than the baseline case.

Of course that being said, the largest detriment to any +1 fitment is NVH as opposed to performance and indeed the performance hit is pretty small especially in a high powered vehicle.
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      07-10-2009, 01:53 PM   #32
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Quote:
Originally Posted by slammedm3 View Post
geeezzzzzz
look what you started lol

who really cares? if you want bigger/nicer wheels. go for it. it will be a very small difference...(same difference as driving with a full tank or an empty tank)
What size tires do you have? I also have the 20" spec 5ives and 9x20 up front with 255/30/20 and 10.5x20 in back on 285/30/20. I can definately tell the difference in slower acceleration and braking, as well as the firmer ride. I have never noticed the difference between a full tank and near empty tank, but I do notice the difference between the stock 19s and these 20s. In my opinion it is a significant difference.
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