Quote:
Originally Posted by why?
um, so other than the 2 most important things on the car when it comes to tracking nothing changed.
Or was the tire and brake compounds the same?
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Tire compound was the same (Bridgestone RE71r) but in different sizes (that was OP's question). All three tires were mounted on 17x9 wheels, I've got two sets but I think all three videos were using the same set (I use one set for the track and one for autox, it's rare for me to use my autox wheels at the track).
The brake compounds were different, in the first video I was using
CL RC6 in the second video I was using some
Hawk DTC 70's and in the third video I was on some
Ferodo DS1.11's
This isn't the best comparison, but no one offered a better one. I've got the AP Sprint kit in the front but no ducts. The RC6 and DS1.11 are very similar pads but the DTC 70's were complete overkill (coefficient of friction was too high). I used either Ferodo DS2500's or Hawk Street/Race pads in the rear (I'm not sure, but I think all 3 videos were with the Hawk pads).
I don't think pads are a huge factor in lap times provided that they don't overheat and that they don't upset the balance of the car.
I should have try swapping wheels and tires with one of my DS friends next time at the track. It'd be easy enough to do it between sessions but I'd have to make sure to run the same compound (I don't run RE71r's at the track anymore after I ruined a set in a single day, but I've always got some for autox and I'd be willing to use them for a session for science).
I've convinced myself that at my local tracks, the wider tires are faster for me. I don't think that there is a huge difference between 225's and 255's of the same compound though, so if I was looking at a big enough price difference between them I'd run the cheaper size (or if there were classing points/issues to consider).
Your results and opinions may vary, I'm just sharing my experiences.