Understeer
 

How much understeer would a 265/295 tire combination have on the track? I am asking because I am trying to decide on a good tire and tire size that can be used on the street and light track work until I can afford a dedicated track set up. I plan on taking a few driving courses so I can have real instruction on how to drive, up to now its just been autox events. Wheels are SSR Type F 19x9.5 et22 F and 19x10.5 et15 R. I am still pretty new to this so it may not be an issue at all. I would like to fit a 275 up front since I am looking at ADVAN AD08's but I can get RE-11's in 265/285. I am investing in tires, brakes (AP brakes from a member) and instruction at this point. Its a base 370z so the brakes are no where close to the task. Wheel to wheel racing with this car is not in the cards anytime soon, just HST and autox.

Just as a reference we are 245 front and 275 rear by the rules.
It's all in the way you set it up :)
I would search what most track guys in here run and use that as a starting point as well as looking to see what is available for $$ track tires in those sizes.
Dwnshift

I run a 265 fr and 285 rear it grips really well and it is the set up also, you can get anything to push at some point

I'd focus on getting best tire you can either RE11 or Hanckook RS3 for street tires. Consiider ditching the 19's in favor of 18's. Then you can get 275 front and 285 rear RS3 setup that works pretty nicely on the track and AX. Look into getting at least 275 up front. While I agree its mostly about setup stockish cars need more tire up front. You likely dont have luxury of dialing in suspension and bars like a race car can. FYI I run 295 rears and 285 fronts on the track on same width rims as you. For AX I run 315 rears and 295 fronts.

If you are doing AX no amount of dialing will offset front end push if you are under 275 so go bigger in front by default for AX for sure.

Shamu, any issues with rub up front with the 295's? Also what wheels and offsets are you running these on?

Run 285 up front and 255 rear.. your car will never push again

Bwaaaahahahahaha
;)

hahah I got a flat so I had to put my spare rims on. 275/35/18 Front and 255/40/18 rear hahahah No pushing here. PS.. I know I could flip them to be a better stagger, but the wheels that the 255s are on dont clear bbk.

OP I would consider running 275/35 all the way around. That is what I run for my track setup.

Any thoughts about a 255/305 set up? I have a swift spring too.
But I noticed while I put in the power on the way to 120miles I started to loose road feedback in the front and the front feels loose like having no grip!

Is this a lack of downforce issue or alignment issue my casters are at Max in front with -1.4 camber and 0 toe.

With OEM sport wheels and oem springs got it off at 140 and it hugs the road like glue very stable.

Can you share inputs. Thanks.

How do the 275's fit? I thought about those but I have no clue if they will rub. My suspension is stock.

I'm running 275/295 on 18's, and it's a very stable setup, almost too stable. It can be a bitch to get the back to push a bit when you want it to, even with the Hotchkis rear sway set at full stiff. Next time I buy wheels+tires I'm doing either 275 or 285 all around square.

With stock suspension you should be fine. My 295s in front only rub plastic fender skirt occasionally (little scuff in plastic) and my car is almost 2 " lower than stock. Remember im on 18s and run 295/30/18. I run 275/35/18 front Nitto Nt05 on street with no rubbing at all.

If 295's only rub a little, then 275 will have zero issues. I haven't bought my wheels yet, ordering them next month. I was planning on going with 18's but Vivid checked brake clearance with he AP's on the type F and said the caliper would hit the barrel. He did say that they noticed the printer didn't print the template out in a 1:1 ratio so that could have been the problem. Worse case, I can order the 18's and check their fit over the brakes before having the tires mounted. Looks like I will be going with either a 275/285 or 275/295. Just need to determine my wheel size then brand of tire. Thanks for the help.

I run 275 all around at the track car feels great


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I am here: http://maps.google.com/maps?ll=33.890729,-118.309364

I'm running RS3 275/35/19 square I love it car feels very neutral the turn in is great now. Still a little bit of under but it's okay. I tried 305's in the rear and had zero issue with rubbing with -2.0 camber so with the proper camber 295 will be no problem.