Was just pointing it out As you said you wanted to use the 17" for the track One thing that no one has touched on is unsprung weight That's the thing that makes 15" better
haha, lots of tyres available i guess. unsprung weight is a given, agreed, not sure what the difference would be though, ill be using mono block porsche calipers and lightweight 2 piece discs, and the wheels will be lightweight, so might not be as much of a difference as someone using heavy single piece discs and single pot slider calipers like a set of 312's off an S3 and some heavy 17' no name wheels Std 312mm single pot brakes are around 17kg a side, i think the porsche setup will be 8 or 9 kgs
Unsprung weight is key now your getting into it Volk/rays te37 rims I run are one of the strongest lightweight rim's you can buy designed for big brakes. 4.25kg a rim 16" BBS 512 split rims 9.5kg a rim 17" in loft 3 years now lol My old Borbets 16" wheel 10kg a rim could not run over 280mm on G60 calipers ...4 pots no way
those old borbets are not good then, even a porsche 996 turbo front caliper will go over stock 312mm discs with stock mk4 16's - i know as i have it all, but the turbo calipers are just too big and getting a lightweight 2 piece disc to suit the 60mm pad sweep area is a nightmare
Here is my Mk2 rolling on 7 x 17 ET42 BBS LMs, Toyo T1R 205/40/17, 19mm spacer on the front & 20mm spacer on the rear. Some arch work was necessary and the car runs full Mk3 16v front suspension and rear beam with a 10.5mm stub axle spacer.... No rubbing, I'll let you make you own minds up as to whether 17's look pants. I'm a little bias
in my own humble opinion, 15,s for drivers. anything bigger for tarts hmmmmm, as he breaks open another beer
i think the 17,s just look too big, furthermore, in my mind, the capacity of air in the tires serves as a component of the suspension system in the vehicle. so combined with the shockers/springs, this acts as part of the overall handling package. if you change one of the parameters then this will obviously affect another. as long as you have a good balance that you are happy with then all is well really. common sense really in my mind, but in summary i think you sacrifice looks for ride quality.(depending on your perspective)
I have a whole bunch of those Yokohamas. Can you show a little more of what you had to do to get them to fit?
I didn't fit them, they were too big. It would basically require a full wide arch kit, much like the Berg Cup cars.
A 1kg saving in unsprung/rotating mass is equal to 3kg static mass (so says a recent Evo article on the subject...) Beyond that a bigger/wider rim has more centrifugal forces and moment of inertia to overcome. Also increased gyroscopic forces when turning, hence "funny steering" as mentioned earlier. Those can generally be offset by a decent set up; altering castor, etc.