Circuit Semi Slicks

[mazman]

no the V700 and V70A are different types/patterns of semi slicks. But he was asking about slicks - i assume the V700 was a typo - the Kumho slick is S700. Which are obviously a different tyre from either of the semis.

I always thought that, but then when i got mine, i have both of those markings on my tyre! I have seen the same on lots of others running the same tyre, and here is just a random photo from the net showing both markings, the v700 and v70a on the one tyre...

Are there other ones that i dont know about? i know theres the v710 on tire rack in USA, but that looks totally different

[hrd-hr30]

confusing branding by Kumho. "Ecsta V700" = V70A model. You can see the V70A on the sidewall as well. "VictoRacer V700" = V700 model.

http://www.kumho.com.au/blog/products/ecsta-v70a/

http://www.kumho.com.au/blog/products/victoracer-v700/

Edited June 22, 2014 by hrd-hr30

[djr81]

Yeah 30 hot is spot on although I think I'm running plenty more camber than you, I'm up to around 4deg now.

Thinking about giving the Kumhos a crack next, I've got the 123S down into the 63's and the A050 a mid 61.

Have a set of Ikeya Formula front LCA's to also fit so hopefully the extra track that gives will help times a little because GTR understeer is a bitch

Nah I am pretty close to your camber setting - just that Wanneroo likes loads of it, moreso than elsewhere & I am not intending on running different wheel alignments for different tracks.

Guessing your spring rates are harder than mine, however.

[MrStabby]

In V70a's, is the choice between K60 (medium) and K90 (hard) as simple as life vs grip? Will be for a full weight 300kw R32 GTR on tarmac (Wakefield and EC).

[Duncan]

I've run both under my car. The mediums are too soft for a 20min race on a hot day.

I've actually just bought another set of the mediums for my car for super sprints etc, I've found them good for the price. One trick is they work best at unusually high pressures, somewhere between 40 and 44.

Like Harry I saw a lot of failures under heavy cars, in particular the commodores running 18s with 35 profile, a few let go in turn 1 at Eastern Creek. I never had a problem with 17s and 40 profile.

[MrStabby]

Damn. I just bought some 18x10.5s to run 265/35-18. Do you think i should still try the V70s (i guess ill get the K90) or go with something else?

[Duncan]

If it was me, I'd give them a run, but like I said some people have had trouble in the past. Have a chat to John at Fsport and see what he suggests to avoid issues, I imagine he will say don't run pressures too low and don't run too much camber.

Another option at a good price is the Federal FZ201, I would have gone them but I was in a bit of a rush to get something for this weekend. You can get them through the club I think....dry performance was good and the price was excellent.

[evil_weevil]

Getting a set of second hand ao50s - only been used for 2 meets

[Tonba]

Although not true semi-slicks, I will be swapping my 265/35/18 AD08's for a set of 295/30/18 AD08R's.

I haven't used the AD08R's, but apparently it is supposed to be a lot better then the older compound??? Anyone tried them?

Edited July 2, 2014 by Tonba

[Plattsy]

anybody used these before?

morea drag radial, but still.....

bf goodrich g force.

[XKLABA]

Although not true semi-slicks, I will be swapping my 265/35/18 AD08's for a set of 295/30/18 AD08R's.

I haven't used the AD08R's, but apparently it is supposed to be a lot better then the older compound??? Anyone tried them?

I've got the AD08s in 265/35/18 and think they are amazing, better then the RS-3s I have and if they Rs are better again that is what I'll be getting next, would mind keepingg us informed of how they go

I have a set of 265/45/18 Hankook Z221s in 265/35/18 I need to get rims for and can't decide if I get 9.5 or 10.5 ( the rims I want only come in either of those ) if any has experience with this size of these what size rims do you have them on what size do you think they should be on

[niZmO_Man]

Which car? You should be putting 285 on a 10.5" mate, because race car .

[XKLABA]

Which car? You should be putting 285 on a 10.5" mate, because race car .

Me ?, R34 GTR, I got the Z221s cheap ( $1500 for the set ) and its a street car first that goes to the track for some happy fun time power sliding

That's why is was considering 10.5 so I can go to 285s later if need be, the 4WD means good 265s should be plenty for what I do with it

What's funny for me is the 265/35/18 Z221s are wider then the 275/35/19 Z222s I have

[niZmO_Man]

My opinion: Fit the widest tyre possible hehehe. I think some people had issues with 285 rubbing? Or were they 295?

[Duncan]

I hope the 295s can fit OK, I have a set for targa high country.

BTW I ran the medium kumho V70A today...they were 1 sec quicker at 46psi than they were at 42psi. Strange. But true.

[zebra]

We can make the 295s fit Dunc

[MrStabby]

My opinion: Fit the widest tyre possible hehehe. I think some people had issues with 285 rubbing? Or were they 295?

From:

http://www.skylinesaustralia.com/forums/topic/156842-best-rim-and-tyre-width-for-circuit-gt-r/#entry2915649

"Having said that I'm pretty sure giant runs 265's on his R34 rims. But the general consesus down here is that stretching a tyre will be faster than sticking a fatter tyre on the same rim. I'm certainly going to be running the 245's on my 9.5's from now on rather than the 265's."

And the Tyrerack website says "As a general rule, Tire Rack recommends mounting Track & Competition DOT tires on the widest rim widths approved by the tire manufacturer (up to the widest permitted by the competition class rules).”

So, what i take away from that is "fit the widest tyre that will fit in the wheel well, on the widest rim that the manufacturer approves for that size tyre", but i have no first hand experience.

[Duncan]

...."Having said that I'm pretty sure giant runs 265's on his R34 rims. But the general consesus down here is that stretching a tyre will be faster than sticking a fatter tyre on the same rim....

I know that's not you being quoted mate, but it is not correct. No way is the smallest tyre for a given rim width going to give better grip than the widest tyre for that rim. Every racing category runs the widest tyres possible on the rim width for grip.

[MrStabby]

So Duncan what do you think about the comments in that thread, eg "Last year I know Scotsman from here dropped 1s on his lap time at Sandown by simply going from 265's on a 9" rim (R34 GTR rims) to 245's and consequently set the fastest time I know of for a GT-R with stock turbo's / engine around that track."

I dont know what to think, but for me the the smaller tyre theory is plausible if it you consider how the tyre cross section could deform and therefore change the contact patch on the tarmac. Then i guess it comes down to weight of car+cornering gs vs sidewall strength. However, plausible doesn't mean its true...

[niZmO_Man]

Depends on the sidewall IMO. Stretch obviously helps keep the walls 'stiffer'. Don't go past 90° A slight stretch is always beneficial IMO.