Quote:
Originally Posted by m1bjr
And the Autocross is a totally different scenario, the little Miata probably just got less rolling resistance from smaller tyres too.
Or maybe it was easier to piroutte around the cones.
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Surprisingly the same result and conclusion was reached by the team testing tires for their Speed World Challenge car as well as by research conducted by Grassroot Motorsports, both on the track AND in autocross. That conclusion, wider is better ONLY up to a certain point, was verified by multiple sources.
There are multiple factors involved, of course. The GRM test was done on a Miata too, so a lighter car may be more susceptible to the phenomena. And the Speed World Challenge car that they tested the tires on was, well, a race car gutted and half a ton lighter than the E90.
Just offering some anecdotal evidence that going wider won't always cure your ills. Don't be surprised to see results that are not in-line with your expectations, or actually not being able to achieve the same speed/time on the track with wider tires. It'll probably help, but it's no guarantee.