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      01-27-2013, 09:21 PM   #23
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Quote:
Originally Posted by edwinm3 View Post
Vossens are heavy as sh^*
... we have a winner.
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      01-28-2013, 08:32 AM   #24
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The hp loss is related to the increase in centrifugal force of the 20" wheels. The greater diameter of the wheel the further the weight of that wheel is away from it's center, requiring more force to spin or stop that object. In essence, a heavy 18" wheel would be easier to spin than a lighter 21" wheel. You dig?
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      01-28-2013, 10:14 AM   #25
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Quote:
Originally Posted by RingMeister01 View Post
The hp loss is related to the increase in centrifugal force of the 20" wheels. The greater diameter of the wheel the further the weight of that wheel is away from it's center, requiring more force to spin or stop that object. In essence, a heavy 18" wheel would be easier to spin than a lighter 21" wheel. You dig?
This is true. Our 20's are the same weight as the stock wheels and produce 20 whp less.
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      01-28-2013, 02:06 PM   #26
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Quote:
Originally Posted by Andrew@ActiveAutowerke
Quote:
Originally Posted by RingMeister01 View Post
The hp loss is related to the increase in centrifugal force of the 20" wheels. The greater diameter of the wheel the further the weight of that wheel is away from it's center, requiring more force to spin or stop that object. In essence, a heavy 18" wheel would be easier to spin than a lighter 21" wheel. You dig?
This is true. Our 20's are the same weight as the stock wheels and produce 20 whp less.
You guys wouldn't care about that Andrew, your car is a beast
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      01-28-2013, 02:25 PM   #27
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Quote:
Originally Posted by edwinm3 View Post
You guys wouldn't care about that Andrew, your car is a beast
Tell that to the critics on m3post Every hp matters!
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      01-28-2013, 03:14 PM   #28
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Quote:
Originally Posted by edwinm3 View Post
Vossens are heavy as sh^*
Weight difference between 20 inch vossen with tires and 18 volk with tires were 6 lbs per rear wheel
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      01-28-2013, 03:23 PM   #29
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Quote:
Originally Posted by Andrew@ActiveAutowerke
Quote:
Originally Posted by edwinm3 View Post
You guys wouldn't care about that Andrew, your car is a beast
Tell that to the critics on m3post Every hp matters!
I know lol
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      01-28-2013, 03:47 PM   #30
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Quote:
Originally Posted by RingMeister01 View Post
The hp loss is related to the increase in centrifugal force of the 20" wheels. The greater diameter of the wheel the further the weight of that wheel is away from it's center, requiring more force to spin or stop that object. In essence, a heavy 18" wheel would be easier to spin than a lighter 21" wheel. You dig?
Part true but the heavier wheel will also have a bigger moment of inertia (harder to get it accelerating) so you will expend more power which translates to a dyno loss

Quote:
Originally Posted by edwinm3 View Post
Vossens are heavy as sh^*
Quote:
Originally Posted by Technic View Post
... we have a winner.
Heavy wheels are a tell-tale sign of cheap casting methods
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      01-28-2013, 03:52 PM   #31
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Quote:
Originally Posted by Andrew@ActiveAutowerke View Post
This is true. Our 20's are the same weight as the stock wheels and produce 20 whp less.
This is the reason trackday guys and race teams will use the lightest and smallest wheels possible, that the brake system allow. Once upon a time, when I had my GT3, the serious guys would spend thousands and thousands on titanium wheel nuts by an italian company NCR and carbon fiber wheels by Oakley. Unsprung mass has the single most major effect on a cars performance in every way, accel, braking, turning, power loss..

Last edited by RingMeister01; 01-28-2013 at 03:58 PM.
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      01-28-2013, 04:18 PM   #32
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Want 6.5% increase torque? Stick with the 18's and go to a lower profile and lighter tire, you will see about the same results as switching out your LSD for a 4.1 at a fraction of the cost! (6MT)
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      01-28-2013, 04:50 PM   #33
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Quote:
Originally Posted by Mr.Metak2you View Post
Want 6.5% increase torque? Stick with the 18's and go to a lower profile and lighter tire, you will see about the same results as switching out your LSD for a 4.1 at a fraction of the cost! (6MT)
This !
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      01-28-2013, 07:51 PM   #34
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For what it's worth I dynoed 520 whp on 20" HREs while I had the ESS VT2-575 (I'm on the VT2-600 now).
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      01-28-2013, 09:05 PM   #35
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Which kit?
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      02-01-2013, 05:21 PM   #36
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Quote:
Originally Posted by Daft View Post
For what it's worth I dynoed 520 whp on 20" HREs while I had the ESS VT2-575 (I'm on the VT2-600 now).
Why upgrade from 575 to a 600 kit?
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      02-01-2013, 05:30 PM   #37
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Quote:
Originally Posted by Daft View Post
For what it's worth I dynoed 520 whp on 20" HREs while I had the ESS VT2-575 (I'm on the VT2-600 now).
Have a baseline with the 20's ?
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      02-01-2013, 10:42 PM   #38
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Quote:
Originally Posted by Andrew@ActiveAutowerke View Post
Have a baseline with the 20's ?
Andrew, what 18" wheels will clear your new BBK kit for those of us who plan on buying it?
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      02-01-2013, 11:54 PM   #39
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Quote:
Originally Posted by AASuperchargedE92 View Post
Andrew, what 18" wheels will clear your new BBK kit for those of us who plan on buying it?
Depends on the size of the brakes you choose.
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      02-02-2013, 12:39 AM   #40
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Quote:
Originally Posted by Andrew@ActiveAutowerke View Post
Depends on the size of the brakes you choose.
I was jumping the gun and assuming that the prototype brakes on Blitzkrieg would be released soon
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      02-02-2013, 02:00 PM   #41
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Quote:
Originally Posted by Chriskm3 View Post
Why upgrade from 575 to a 600 kit?
From what I understand, the 575 and the 600 kit share the same injectors, only the tune would have to change. The 625+ kits have upgraded injectors.
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      02-02-2013, 02:49 PM   #42
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Quote:
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From what I understand, the 575 and the 600 kit share the same injectors, only the tune would have to change. The 625+ kits have upgraded injectors.
Pullies and a tune fore sure.
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      02-04-2013, 08:35 PM   #43
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No one has mentioned tire differences causing a reduction in dyno results here. Tires with additional siping in them cost power as well. Back when I had my Evo it dropped 15hp switching from Pilot Sports to Conti All Seasons. No changes in equipment, and same day dyno results. I swapped them just for fun, same wheel fitments.
Often times guys and girls swap wheels but also run different tires, which will vary the results as well.
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      02-04-2013, 08:56 PM   #44
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Quote:
Originally Posted by Bmw135er View Post
No one has mentioned tire differences causing a reduction in dyno results here. Tires with additional siping in them cost power as well. Back when I had my Evo it dropped 15hp switching from Pilot Sports to Conti All Seasons. No changes in equipment, and same day dyno results. I swapped them just for fun, same wheel fitments.
Often times guys and girls swap wheels but also run different tires, which will vary the results as well.
Very good point
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