Norm Peterson
corner barstool sitter
A tenth is a tenth, not the whole second claimed. What I'm saying is the ability of short sidewall 19's to launch could possibly be that much poorer than taller sidewall 16's of the same OD. Maybe this hurts some people more than it does others.Considering Build'em went to the hundredths of a mile when telling us the mpg changes by going from 16's-19's (he said it decreased mpg by 2.34), I think a tenth of a second is noteworthy on a quarter mile run.
Incidentally, the V6 and 4.6/GT rear brakes are both 11.8" rotors, meaning that nothing special needed to be done to run the 16" tires at least in the rear for acceleration purposes. Launch bite, remember, which does not depend on front tire size (yeah, it would be nice if we knew whether a single set of front tires was used for every test).
I don't take anybody's mpg numbers to anything finer than whole mpg's, so I agree with you that at least that part cannot be as precise as implied.
So let's see if he comes back in to provide further description.What can be asserted without evidence can be dismissed without evidence. Build'em didn't post a shred of evidence to back up his claims, why should anyone lift a finger to try and disprove said claims?
Let me remind you how I phrased it. Emphasized.
There is a lot we don't know yet. Too much. What I'm mainly interested for the original purpose of this thread is limited to the difference in rotational inertia (which is small and can be estimated pretty closely) and in launch bite (which is unknown and tire dependent).If the extra second was because the 19's launched that much more poorly, a 1-second gap would follow every one of those zero-to-speeds and follow pretty close on ET.
Beyond that, some peoples' launch technique almost certainly suffer more than others' when the tires won't take a brutal launch. While you probably can't see with the naked eye any sidewall wrinkling to absorb shock in any of the street tires Build'em used, the effect is still there and will still give the tall sidewall tire an advantage. I can't put a number on this, unfortunately.
Norm
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