Weight Difference Between 17' And Small Brake Vs. Bbk +18' ?

[cobrAA]

Hey guys,

I must say, I do not do track.. well maybe next year, I will try some lapping/time attack just for fun ( but it will be my first time, so I doubt I will be abusing the car too much).

My setup right now:

BNR32 with 17x9.5 with 245/40 sumitomo HTR Z3, Brembo R33 with DBA 4000 all around, HPS and SS lines Ate blue.

Since I realise I could go 18x10.5 and it would clear, I got excited and was thinking about getting ''better traction tires'' for less tires spinning on the dragstrip ( something along the line of 265/35 star spec). With sticker tires and larger tires I would end up with a better traction.

cost: about 1000$ ( including the fact I sell my actual setup + money to buy new set)

Brake:

Obviously, I will want to be able to fill up those bigger rims so I'm thinking a brembo kit 4 piston front and rear 355mm and buy myself some plain Brembo disc or buy back some DBA 4000 T3 clubspec.

I think with an extra 600$ I should be able to cover the complete swap.

But now do you guys think it's worth to pay 1600ish to add more brake ( maybe over-kill for my application) and a little better traction WHILE ALSO ADDING WEIGHT ( maybe an extra 5 lbs per corner x4 because its ''inertial/moving parts'' ) that might make my car less quick ??

Or Am I totally wrong?

[djr81]

But now do you guys think it's worth to pay 1600ish to add more brake

Not at this stage, no. Just get some decent pads & fluid.

If you are worried about unsprung weight dont put rims on the car that are atleast a couple of sizes larger than they need to be. You dont need 10.5" rims to fit a 265 tyre. If you are getting larger rotors get two piece rotors.

With that kind of weight difference you wont feel any difference on the drag trip & other than the ride quality will not be able to tell anywhere else either.

[GTSBoy]

Yuh, I agree with djr81.

Your wheel size choice is more about aesthetics than function. You can fit 265s on the rims you have. The lower sidewall height from going to the 18" rim will not noticeably change the grip performance of the tyres. Changing the compound will, but you can do that with what you have.

[KiwiRS4T]

You don't need to change your rims - you are quite undertyred now.

I have 255 40 17 on my 9in rims.

You could easily run up to 275s on your 9.5in rims

If you already have braided brakes lines new Motul RBf600 brake fluid and a mastercylinder stopper will help and make sure you have some good pads.