Andy,
No real hard data, just seat of the pants: I ran a 205 and then switched to a 225 on my GTi. I was getting the 225 up to heat (at least in the front) but I went from hitting 5th on the straight at LRP with the 205 to keeping it in 4th with the 225.......But with faster lap times....... Not sure how well this applies to your situation......If I had the money and I was going to a WGI or Road Atlanta, I would have gone back to the 205s....
Jeff L
ITA Miata
2010 NARRC Champion
2007 NERRC Championship, 2nd place
2008 NARRC Championship, 2nd place
2009 NARRC Championship, 2nd place
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