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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-02-2009, 11:56 AM   #61
phlfly
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Originally Posted by dkirby147 View Post
This is all correct. As a general rule, you should size your wheels and tires such that the tires' outer diameter is as close to OE as possible.


Yes and no. The angular speed is the same at any point of the wheel/tire, but the linear speed is not. Regardless, my previous posts address how increased mass moment of inertia affects acceleration and braking... not steady speed.


If you keep the same tire OD and width then you are correct that the mass moment of inertia of the tires would decrease, but not enough to compensate for the increase in mass moment of a heavier (or even equally heavy, but larger diameter) wheel. As far as it's significance to the bigger picture, that depends on several other factors. A lighter car, a less powerful engine, a lower drag coefficient, or less rolling friction would all increase the percentage change in acceleration/braking due to a change in mass moment of inertia. As I said before, the effects would be more noticable on a 318 over an M3. Ultimately, it's up to the driver, if he/she notices or cares about any performance degradation. What's insignifcant to you, might be significant to someone else.

For the record, I can't wait to retire my 17" M68s for 18" TR Motorsports MT1s. Just waiting for the funds.
BTW 68 style is a lightness wheel for E46 model, according to some link has posted here to German website.
I was reading on Porsche forum about same problem, so they came up with dyno test for HP, so difference between 19 and 20, so hp loss was like a couple HP, but I think it's loss of the inertia only. In other words: you have a open road, so with lighter wheel/tire you will go to 100 mph for time X, but with heavy wheels it would time Y to reach same 100 mph.So the weight and tires would a make difference, because your drag will increase with weight, but HP should be same.
But narrow tires will decrease cornering performance and start up performance(narrow tires on rear, because we have rear wheel drive car, but front wheel drive will opposite to it).
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Last edited by phlfly; 09-02-2009 at 12:10 PM.
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Old 09-02-2009, 12:03 PM   #62
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OK, so how many "HP" are we talking around here? I had intake, header, and thn I upgrade for CSL reps, does that mine that my car is as fast as before the mods with 17s?. If yes, then when a noob asks, "what can I do to make my car go faster?" the first answer should be "Lighter wheels!". Because to be hones, 5 to 10 hp is not noticeable except on dyno or track, so If you guys are "feeling" it that means it must be good at least 15 hp.
If a noob asks that question, give them a and tell them to search. Most often there are 18, have no money, and expect increased performance from a cheap intake and exhaust, and they don't comprehend the fact that weight slows a car down.
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Old 09-02-2009, 12:32 PM   #63
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Where are you guys getting data for oem wheel weights? I need the link . . . .

Anyone know how much the Z3 style 42 16"x7" weigh? I'm thinking about getting a set for the track and put some Star Specs on.

I just don't want the setup to weigh more than my 18lb. BBS RC's
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Old 09-02-2009, 12:45 PM   #64
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Where are you guys getting data for oem wheel weights? I need the link . . . .

Anyone know how much the Z3 style 42 16"x7" weigh? I'm thinking about getting a set for the track and put some Star Specs on.

I just don't want the setup to weigh more than my 18lb. BBS RC's
search noob!

plenty of places

http://felgenkatalog.auto-treff.com/
http://wheelweights.net/
http://bmwfans.info/
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Old 09-02-2009, 01:13 PM   #65
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"The tires were removed and measured for circumference and set on the scales to record weight. The stock steel wheels and 185/R70-13 were 6 feet, 3/8 inches in circumference and checked in at 29 lbs. Then, Nitto 205/ZR40-17 tires were mounted to 17-inch aluminum alloy wheels. This combo measured 6 feet, 2 1/8 inches and tipped the scales at 38.5 lbs. The upgraded combo was 9.5 lbs heavier and 1.75 inches more in circumference. Back to the dyno. The DX was brought to peak power and suffered losses throughout its entire rev range. At peak, 3.8 ponies were lost, but drops as high as 6 hp were realized at 70 mph. Ouch."
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Old 09-02-2009, 01:15 PM   #66
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Well . . . this lists them at 8.6kg
http://bmwfans.info/parts/catalog/Z3...ross_spoke_42/

And this lists them at 9.9kg .. .
http://felgenkatalog.auto-treff.com/
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Old 09-02-2009, 01:24 PM   #67
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Well . . . this lists them at 8.6kg
http://bmwfans.info/parts/catalog/Z3...ross_spoke_42/

And this lists them at 9.9kg .. .
http://felgenkatalog.auto-treff.com/
Go with 2nd site. That lists them as 21.78 lbs. each which is about right. The 8.6 puts them at sub-20 lbs...which I find hard to believe.
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Old 09-02-2009, 01:25 PM   #68
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i didnt notice a thing with my 19 vmr csl and when i got spacers.... the car felt sticker and easier to get off the line and alot quicker through the corners
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Old 09-02-2009, 10:07 PM   #69
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i didnt notice a thing with my 19 vmr csl and when i got spacers.... the car felt sticker and easier to get off the line and alot quicker through the corners
Yea but u have a 330 LOL on a 325 I feel it really bogged it down. (AND im guessing u have a stick too)
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Old 09-02-2009, 10:55 PM   #70
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i didnt notice a thing with my 19 vmr csl and when i got spacers.... the car felt sticker and easier to get off the line and alot quicker through the corners
doubt it.
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Old 09-03-2009, 01:26 AM   #71
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doubt it.
Miles, I like this guy. He calls BS when he see's it.
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Old 09-03-2009, 01:41 AM   #72
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Miles, I like this guy. He calls BS when he see's it.
Yes, I Chris too.

You shoulda seen him on some of the E90 forums when a vendor made a statement about their wheels that wasn't entirely true. Chris was on top of it, and then I think the vendor got pissed and decided to be kinda creepy and started stalking Chris on E46fanatics.
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Old 09-03-2009, 01:47 AM   #73
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Yes, I Chris too.

You shoulda seen him on some of the E90 forums when a vendor made a statement about their wheels that wasn't entirely true. Chris was on top of it, and then I think the vendor got pissed and decided to be kinda creepy and started stalking Chris on E46fanatics.
who hasn't done that?
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Old 09-03-2009, 01:53 AM   #74
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Miles, I like this guy. He calls BS when he see's it.
I don't know you, but I from what I've seen...

Quote:
Originally Posted by mkodama View Post
Yes, I Chris too.

You shoulda seen him on some of the E90 forums when a vendor made a statement about their wheels that wasn't entirely true. Chris was on top of it, and then I think the vendor got pissed and decided to be kinda creepy and started stalking Chris on E46fanatics.


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who hasn't done that?
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Old 09-26-2009, 10:07 PM   #75
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I really wanted to ditch my Style 44 and get rep e90 M3 18
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Old 09-26-2009, 10:14 PM   #76
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I really wanted to ditch my Style 44 and get rep e90 M3 18
k
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Old 09-26-2009, 10:20 PM   #77
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this makes me want style 68's.


I never knew they were 20.9439149 pounds
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Old 09-27-2009, 10:41 AM   #78
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I have style 43 7Jx16 - quite light at 20.7lbs (bmwfans.info).
I won't be doing 18" wheels on a 320i! I can't spare the horses ....
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Old 01-09-2010, 01:20 AM   #79
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I have style 43 7Jx16 - quite light at 20.7lbs (bmwfans.info).
I won't be doing 18" wheels on a 320i! I can't spare the horses ....
Bob

haha smart man! yea thats the sacrifice.
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Old 01-09-2010, 03:29 AM   #80
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Interesting thread to read as I was considering the v710s. Would love to hear other 18'' v710 owners chime in. I am switching from 18'' m3 oem wheels to these in 18'' non-staggered. I am guessing I won't notice much difference will I?
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