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Old 04-25-2013, 10:39 PM
CdnoilRAM's Avatar
CdnoilRAM CdnoilRAM is offline
I push the skinny pedal


 
Join Date: Jul 2009
Location: Calgary, AB, CA
Age: 30
Posts: 16,963
Gender: Male
Vehicle: 2009 Blown 349 Hemi
Trim Level: Sport - Modified
Color: Brilliant Black/Snake Skin Green
Engine: 2009-2012 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 20
Rep:3225
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You would really have to look at several factors and S.C. named the main ones. The one with the biggest factor is the wheel's inertia, namely it's rotational mass and how far away it is from the center of inertia. Since you're running 35s, I bet they're m/t's which have a very heavy tread, so your tire's mass is located a long way from the wheel hub, which requires more torque to get it moving.

The relationship between everything is T=I*a, so if your Torque stays the same (power from axles) and you shrink your distance (smaller tire), you end up with a higher moment of inertia value. Take a look at your wheel weight of the 35s and then look at 33s, or even 31s. A good thing to remember when looking at wheels/rubber for track use, you want to use the smallest wheel possible and the diameter that will give you the most effective launch without over revving the engine at the track.

I ran stock diameter 30" tires with a decent street compound on a set of 22" wheels, and just switching to a set of 17" wheels and keeping the diameter the same made a difference in ETs because I reduced the center of mass
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