OWTKAST cpt

iTrader: (1)

So would If I'm going to buy tires would a 255 str setup be better for competitiveness or r comps for for bsp??

I'm leaning the STR route

03threefiftyz

iTrader: (25)

^you need to make sure you follow the rules for wheel width as well.

OWTKAST cpt

iTrader: (1)

8.5x17

A good offset and some 255's

Z1NONLY

iTrader: (2)

I have not seen a good set of 255/45 17's and the 255/40's are crazy small (short) for rear tires.

OWTKAST cpt

iTrader: (1)

I was thinking a 50-55

guitarist

iTrader: (1)

They aren't that short--still hit 58 in second in an '03 w/6,500rpm rev limit. That's about 2-3 mph off stock height. And less sidewall is your friend, imo.

The car will be more competitive for less money in STR than in BSP. On smaller, tighter courses the Z actually does well thanks to its good low-end torque. The other cars (S2K, MX-5) are continually shifting back and forth between first and second, while the Z can usually just pull second the whole time.

btw, OWTCAST, PM me if you're interested in a set of 17x8.5 +35 SSR Type C RS in Anthracite. <17lbs each, and look almost new.

OWTKAST cpt

iTrader: (1)

I'm unemployed for about another month and half (no not funemloyed lol guy ripped me for spending government money and buying car parts lol.. I was like no not me)

I would think I'd want more offset though with only bring 8.5

Like a 15 or lower???

Also read 2wd was allowed a 9" wheel..??

guitarist

iTrader: (1)

STR is only 2wd (only RWD, on the allowed cars list, in fact). And yes, the 9" wheel is allowed. I just went with these because I got a decent deal on them, and they are light yet strong.

As for more offset, I don't really know why you'd want more aside from aesthetics. The car is already wide enough as it is, and if you kick in the camber you're going to need to be fast on street tires, the +35s will stick out of the wheel wells at the bottom anyway (they do on my car). Adding to that just makes it that much harder to slalom at the speeds you'll need to to keep up with the narrower S2Ks and MX-5s.

Anyway, let me know. I won't be able to put the car back to stock until mid-August anyway.

OWTKAST cpt

iTrader: (1)

Okie dokie...

I am allowed 255 9.0

Now... what would be good for sidewall on a Z??

Also is there much in term of getting more RPM out of the stock motor with a tune?

betamotorsports

iTrader: (1)

OK, if you're going to run in the ST category you have four tires to choose from if you want to be even remotely competitive:

Direzza Sport Z1 Star Spec
Hankook Ventus RS3
Kumho Ecsta XS
Yokohama ADVAN Neova AD08

Your size choices are basically:

255/40-17
255/35-18
255/40-18

IMHO, the 255/40-17 and the 255/35-18 are the two sizes worth looking at.

03threefiftyz

iTrader: (25)

+1 on the quoted.

OWTKAST cpt

iTrader: (1)

Which is goin to give me a greater roll out?? A couple locals say they are losing on the high end of 2nd gear to the s2000's

I assume the 18 40

betamotorsports

iTrader: (1)

Just calculate the tire OD from the size information.

OWTKAST cpt

iTrader: (1)

Is there anything considered the "best" tire of are those four a good toss up?

Thanks again to everyone for the input. All the info and "Arguing" in other areas is fairly overwhelming..



PS very hard to find those tires in the right size.... lol

betamotorsports

iTrader: (1)

There is no "best." Each tire has its own strengths. The Dunlop heats up quickest and is fastest in the early runs. The Kumho is slower to heat up but can handle heat better. The Hankook has the best grip but the steering response is vague. The Yokohama handles heat the best and is consistent but generally slower then the others.

FYI... the time differences are very slight.

OWTKAST cpt

iTrader: (1)

Alright... so ... I need to find a wheel offset Ideal for the Z.. that clears brembos (would like to pick some up) In the above tire choices... hmmm I ve got some searching, learning, saving to do lol

Thanks guys.

guitarist

iTrader: (1)

Whatever you gain by going to a taller sidewall in terms of 2nd gear mph will be lost (or more than lost) in decreased feel (taller sidewall=more flex) and low-speed acceleration (from the taller gearing).

Personally, I'd say learn to shift up to third and back down if you're on high-speed courses that much. It's not really that tough, and it's easier than shifting down to first like the S2Ks and Miatas have to do sometimes.

Or you could always raise the rev limiter and spin the engine another 500-800rpms for a few more mph. A bit risky, but it's legal.

Clam

iTrader: (6)

True, I've only autocrossed with the Dunlop Star Specs and AD08's on two different vehicles, a 350Z and an RSX. However, in terms of heat, the Star Specs hold heat better than the AD08's in hot Texas weather. In terms of heat up, the AD08's heat up quicker than the Star Specs. For consistency and steering feel, the AD08's feel better than the Star Specs.

If I were to have two sets of tires for the seasons, I would use:

AD08: spring/winter
Star Specs: summer/fall

You can't go wrong with either tire though. Set-up is key in extracting the most potential out of any of the top tires

gunluvS14

iTrader: (1)

IIRC 275 size won't allow you to run in STR, so you are stuck with STU class. If you don't care about being competitive, you can run the stock class or street prepare class as well

Not the best choice for autoX, look into Bstone RE11 or Dunlop Z1 star spec for car weight more than 3000lbs

Understeer in entrance? mid corner? Obviously you are not understeering on the exit, but it sounds like it can be adjust by driving style. It's difficult to give you a definitive answer

Different car setup, different driver, different track condition. When I ran my G35 in STX class with non stagger 245 size Dunlop Z1; I feel comfortable with 33.5psi hot (front) 35psi hot (rear) on asphalt; 36psi hot all the way around on concrete. Car is near bone stock.

You can't go wrong with 2nd gear in most tight course, you have enough torque to drive you out. Most shifting mess up balance and waste time.


Hope that helps

OWTKAST cpt

iTrader: (1)

THAT HELPED A TON.. lol


IIRC 275 size won't allow you to run in STR, so you are stuck with STU class. If you don't care about being competitive, you can run the stock class or street prepare class as well

I am shooting to change my wheel/tire setup to be STR legal


Not the best choice for autoX, look into Bstone RE11 or Dunlop Z1 star spec for car weight more than 3000lbs
Thank you.. the more i read the more I like what i heard on the dunlops


Understeer in entrance? mid corner? Obviously you are not understeering on the exit, but it sounds like it can be adjust by driving style. It's difficult to give you a definitive answer
Car understeered literally til i used the throttle to bring it around... I tried to run it easy and drive it in smooth and lost 2 seconds. I was sliding the rear just to get it to rotate on the tight corners.


Different car setup, different driver, different track condition. When I ran my G35 in STX class with non stagger 245 size Dunlop Z1; I feel comfortable with 33.5psi hot (front) 35psi hot (rear) on asphalt; 36psi hot all the way around on concrete. Car is near bone stock.

Do you recommend more rear then front?? Or is this all just circumstantial I assume??


You can't go wrong with 2nd gear in most tight course, you have enough torque to drive you out. Most shifting mess up balance and waste time.

I never tried just running second gear... if I am ever on a course that tight again I definitely will