It make any sense to just upgrade rotors?

BeauNC

If I remember correctly, the RA1's are a far stickier tire than the RE11, so that is quite an improvement on brakes alone. I only had 8 track days and about 800 miles on my old Z. I wish I could have afforded more. Track driving is more addicting than crack I'm pretty sure.

cossie1600

I wouldn't say it is far stickier, but definitely stickier.

370z lap at VIR
YouTube - 0810 VIR 370z hotlap 217.AVI

350z lap at VIR (with traffic or should i say a-hole blocking me)
YouTube - 0907 VIR Nissan 350z blocked by BMW M3

I just pulled the datalog from 2007 with a 350 Enth (stock with XP10 pads) vs 370 sport (stock with XP10 pads)



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The top chart is the speed at different points at VIR (starting from the VIR sign at the S/F). The middle graph is the delta (difference between the two laps). The last one is the longitudinal G's. As you can see, the 235 RA1s were stickier than my 265/285 RE11 as indicated by the faster cornering speed (blue is 370 and red 350). You can see the 350 can start into the corner faster or at least at the same speed as the 370, of course the difference ends as soon as I hit the gas. As far as braking, you can see I can brake into the corner much later in the 370 than the 350 at the two heavy braking spot despite carrying 3-5 mph extra and having less grip. This translates to a peak of 1.29G in T1 vs 1.09G in T1 on the 350.