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      11-07-2012, 01:06 PM   #7
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Drives: E90 M3
Join Date: Oct 2011
Location: Midwest

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Originally Posted by Superfly_M3 View Post
Right ... I get it, braking, acceleration, handling. But how much difference are we really talking about?

Tech, I don't know, thats the point of this thread. Can anyone compare or relate this to say "whp" gain or how much the car would feel lighter by?

Sorry I can't answer your question directly, but perhaps you'll find some value in this data --

Going from stock brakes, wheels and tires to aftermarket (see sig) I shaved nearly 6 seconds off lap times at my regular track.

1-2 seconds of that was brakes, 3-4 seconds tires.

My Apex wheels and RS3's are actually about 3 lbs. heavier than stock wheels + tires.

My gut tells me that 18" BBS FI, for example, at ~5 lbs. less per corner than my Apex wheels may shave a couple of tenths.

With a 200 lb. passenger I lose maybe 1 second/lap. Is the disadvantage of adding that much weight in the cabin less than the advantage of a few pound decrease in unsprung weight in the wheels? I'm not certain, but I don't think so.

That said, I can understand lighter wheels from the standpoint of an overall weight reduction, and overall performance increase. (Or even if you have the $ and just like the look of a particular light weight wheel.)
DCT E90 M3: Akrapovic Evolution, KW Clubsport, Stoptech ST-40 Front + Pagid RS29 | Stock Rear + Stoptech SP, Apex ARC-8 + Hankook Ventus S1 noble2 275 35 18 (street), Apex EC-7 18x10 ET25 + Nitto NT01 275 35 18 (track), tbd...
Past: Velos Designwerks Tune, Megan Racing Catback, Macht Schnell Filter