Best Tyres For Sprint And Time Trials

[2lazy]

must have been two types of v70's or the guy was high on antidepressants

Edited April 21, 2010 by 2lazy

[zebra]

yeah the 2nd type grows in the "backward".

Anyhoo

I have a set of 2nd hand dunlop formula Rs yet to see how they go but bang for buck a bit over 200 bucks for 6 slicks is a bargain imo.

I just hope it doesnt rain lol

[Marlin]

yeah the 2nd type grows in the "backward".

Anyhoo

I have a set of 2nd hand dunlop formula Rs yet to see how they go but bang for buck a bit over 200 bucks for 6 slicks is a bargain imo.

I just hope it doesnt rain lol

AhhhhHUH! Same guy, nice catch

[Duncan1]

If anyone is still running 235/45/17's the re55s can be had for $350 a tyre

at present. Not sure if its all 3 compounds but i know for sure they

have sr2's [hard] for that price, which is the pick for weekend warriors anyway!

Good buying i say, there is a group buy on Evolutionoz, having said that

a few of the boys have been grabbing them for that figure from other

suppliers also.

Cheers..

[Duncan]

Im just going by what the distributor nsw told me, they had to run 42 psi!

bit late....but this is spot on for Kumho v70A

We used to run these as control tyres and they perform better at road tyre like pressure....we used to run between 42 and 44 hot pressure. In fact performance did not drop of hugely right up to 48-50psi. Very unusual but I can't argue with the lap times.

[nismoman]

bit late....but this is spot on for Kumho v70A

We used to run these as control tyres and they perform better at road tyre like pressure....we used to run between 42 and 44 hot pressure. In fact performance did not drop of hugely right up to 48-50psi. Very unusual but I can't argue with the lap times.

Well I've got a supersprint this weekend at Wakefield Park and I will try running a bit more pressure in them to see how it goes.

Previously I've only run a maximum of 35 psi hot in the V70A's and the tyre wear was nice and even. I don't have a pyrometer so can't comment on how hot the tyre was getting in places.

If it means I'll gain a bit in lap times Duncan, it's worth a try.

[Duncan]

maybe too late for this weekend.

but there are the 3rd best tyres I have run behind dz03g and re55s, and they are 30-50% cheaper. so a clear winner on cost/performance. If you have to win (ie cost is not a factor), the other 2 are the only option.

Like I said I ran 42-44 for best results on the gtr....but heavier cars like commonwhore ran even higher with good results. of course we are way outside sensible/manufacturer recommendations....just saying what actually works with these tyres.

[2lazy]

funny how nobody believes you when your a noob lol.

[Duncan]

lol no idea why anyone listens to anyone on the internet. 82% of people are talking shit with no experience and 87% of numbers are just made up on the spot

[Duncan]

what happened with these tyres in the past few years by way of history.

around 5+ years ago the v700 were the control tyre for IPRA. those guys get every last 10th out of their cars due to fairly restrictive rules and they found these tyres were actually pretty good. But especially so when buffed (ie some of the "new" tread depth removed). So everyone started peeling 70% of the tyre off, got good performance, but they were expensive to run becuase after the buffing they would only last 1 or at the most 2 meets before being below the tread depth indicators. they still worked fine at that level, almost like slicks, but were not legal because there was not enough tread left.

in the years since, for whatever reason, they were not used much or well regarded. I think this was a mistake, the v700/v70A are a good tyre. Some people like Ben, and for that matter Tony Sullens used them for good effect at events like targa (especially the soft compound).

2 years ago kumho V70A won the production car control tyre contract in NSW from yokohama. That is where I first met them and used 4 sets over 6 rounds trying different pressures etc. There were a further 30 cars running them including the commodores like I said. We found by accident and rumour that they worked best hot (ie people accidently letting them get too high, finding good results then checking pressure to their surprise). Mine definately worked better at that pressure but some guys literally run them at 50+psi getting the best results. Make no mistake these guys are dead serious about lap times because the front running cars are very similar, they would not run these pressure unless they gave results. John from fsport was obviously all over the pressures and results people were getting - no wonder he recommends high pressures too

However, in the low profile tyres (35 and under, like 265.35.18) they started to fail at these pressures. the distributor rightly pointed to over inflation but in the end, due to perceived ureliability they were ditched as the control tyre for safety reason. we now run an open tyre list and the same cars are running 1 or even 2 seconds quicker on the same tracks using dz03G or re55.

no disrespect to ben's experience (hell he can farm potatoes like no-one I know), but targa experience and track testing/development are totally different. there is absolutely no doubt these tyres work better at much higher pressures than others. FWIW I run the dunlops at 32-34psi so I am not some crazy high pressure fetishist.

[LSX-438]

great post Duncan.

what do people find works with the AD08's in terms of pressures?

[Duncan]

I've never used AD08 but I have done some track work on high end street tyres. They generally work best with high pressures too (and low aspect ratios) to make up for weaker sidewalls. If I don't have a starting point I use the following guide:

Street Tyres: 38-42

Semi Slicks: 30-34

Slicks: 28-32

Of course lots of tyres are different, and the heavier the car, the more pressure is needed. But it is a good starting point.

Duncan what works with the r35 dunlops? being run flats I guess the rules are different again?