Quote:
Originally Posted by renfield90
If there is even one or two big digs (so all other courses), you get destroyed by everyone on 245s. Generally speaking our cars are thrust-limited coming out of digs, not traction-limited, and you are reducing thrust.
Bottom line is wider rubber should help in theory, but the gearing changes add a course dependency factor that is much larger than any extra grip you might get.
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Little bit of anecdotal information. A friend of mine has a '14 BRZ, we are both STX prepped (mine is a '17)
He has a better tune, dyno'd both cars same day same dyno, his makes 19HP more.
His car weighs 95 lbs. less then mine.
He runs 245's, I run 255's.
We did a 1st and 2nd gear pull. cars were practically dead even.