after some debating and unable to get any further.. does the type of tire effect the qt time? specifically speaking- going from (stock 02 wrx rims) blizzak studdless tire to the new falken azenis rt 615 - is there any difference in the qt time? i would expect maybe somethin' small b/c i know about wheel weight and rotational inertia and how that affects scale weight and how 'speed' builds up from the crank to the wheels and what not.
i'd appreciate any opinions and esp. if you have slips to prove a difference in time just thru swappin' tires on the same rims.
thanks, dub. ~S.R.S.

 

Type of tire may make a small difference, as you noted. Mostly rolling resistance and traction/lack of traction.

The size of the tire, specifically the rolling diameter of the tire, has a very large effect. Smaller tires effectively lower your final drive ratio. Larger tires are just like increasing it. The relationship between tire diameter and effective torque at the wheels is linear.

 

question owned...

just to add a little, you'd most likely get a slightly quicker time with tires slightly smaller in diameter.

 

Good addition. I'd change your wording to "you WILL get a quicker time with tires smaller in diameter, and you'll get a slight improvement with tires that are lighter", but we're on the same page here. Thanks.

 

thanks for the info what i figured. peace