ianbru
Midfielder
Surprisingly, Ian Bru is not my real name! (it's Greg)
Posts: 96
|
Post by ianbru on Feb 26, 2010 10:08:11 GMT
DC........... I'm sure you'll be observant enough if you happen to see the big yellow and black novice "target" on the back of my car at any point in the season! I'm sure that'll focus the mind no end!
|
|
|
Post by s3swiss on Mar 2, 2010 17:22:40 GMT
From the SMRC website - info on the new tyre: After 13 terrific years of racing on Kumho Tyres the XR2 s are changing tyre supplier. Fiesta XR2s will be on Yokohama tyres for 2010. All cars must change to use Yokohama A048R (K8229) 185/60R 13 which will be the control tyre for the Fiesta XR2 Championship. Nominated supplier is R A Thom, Wheels Around. They are providing a race day service at Knockhill and must be supported. Wheels Around Carrie House Bridge of Earn Tel: 01764 662897 / 07711 577148 The 2009 control tyre Kuhmo 175/60HR13 Ecsta V700 K9A compound will only be eligible for the first meeting at Knockhill (rounds 1 & 2 ). Round 3 onwards all cars must use the Yokohama tyre. In tests at Knockhill ICR motorsport felt the Yokohamas will enable XR2s to lap around 1 Ð 1.5 seconds per lap quicker than the Kumhos. The new Yokohamas are to be around £75.00 inc vat each including fitting and balancing at Knockhill by R A Thom. They will be at the circuit on the Saturday before each Sunday race meeting as well as on race day. Order your tyres as soon as possible. Fiesta ST cars will continue to race with XR2s starting behind them as in 2009, and use Dunlop tyres as per BRSCC national regulations. Championship prize fund will be announced by bulletin. Regulations will shortly be on the club web site.
Seems to answer all questions pretty well - guess we will need some yokey stickers as well?
|
|
|
Post by Charlie on Mar 4, 2010 0:21:02 GMT
Thanks for post Tony,
You just saved me from posting same
Charlie
|
|
|
Post by s3swiss on Mar 6, 2010 21:32:59 GMT
Just got some of the new rubber today - don't suppose any MINI drivers feel like sharing info on pressures?....perhaps not:) One thing for sure, they are a larger overall diameter than the Kumhos (had to adjust my tyre rack)- will have to check how they fit under the arches with my current front camber settings...
|
|
|
Post by XR2 Baz on Mar 6, 2010 23:44:24 GMT
As per a previous thread, 70psi front and rear should be suitable ;D
Baz
|
|
|
Post by s3swiss on Mar 7, 2010 20:58:58 GMT
sounds like that will work just fine with my 5 degrees positive camber
|
|
|
Post by Mike Strong on Mar 22, 2010 19:25:42 GMT
Well I tried the new tyres on Sunday and first impressions are they are very good, though perhaps not the 1.5 seconds faster that some people have said. The tyres seem to be pretty resiliant and you can feel the extra grip mid corner and under braking. Peter C did a full day's testing on them and using a very scientific approach - I didn't even know ICR had a tyre temperature gauge! - he made adjustments to tyre pressures throughout the day. If I remember correctly he did a 63.5 which he reckoned was about half a second faster than he would have gone on Kumhos in similar conditions. I only did the afternoon test, though the first of the three sessions was a waste of time as I kept on tripping over the classics or getting out the way of the fast stuff. I tried Peter C's pressures at the time - 27 Front 35 Rear - for the second session but I couldn't get the rear end to budge in the corners no matter what. I bumped up the rears to 40 for the final session but it didn't make much of a difference to be honest. I managed a 65.1 in both sessions. On the Kumhos I probably would have been in the very high 65s. So that was 27 Front 40 Rear. I did a 65.1 on Kumhos in October and that was running 23 Front 50 Rear so I may need to go similar on the Yokos. To be honest my suspension units are probably in desperate need of servicing - email sent to Proflex this morning - as they've not been done for at least four years, probably even longer. Depending on how much they say it will cost, adding air to the rears may remain the cheaper option though - until the first mid race rain shower... Anyway, Charlie ran the same pressures he ran with the Kumhos and he seemed happy with them. He didn't have a timer but he's sure he was doing 62s.
|
|
|
Post by Charlie on Mar 23, 2010 0:01:28 GMT
Yes, I've finally got back on track and tried out the new Yoko's. 1st impressions are ;D amazing . As Mike said they just hang on and on in the corners. The feel is great and I find that I can attack the corners and braking points better than ever. Pity my lines are crap. Anyway, Charlie ran the same pressures he ran with the Kumhos and he seemed happy with them. He didn't have a timer but he's sure he was doing 62s. Don't know about the 62's but I was happy to be quicker than you Rusty and out of practice as I am I think that I have already put in a few laps close to my own personal best on Kumhos. I could have improved my times some more but every time I seemed to be on a stormer I got overexcited and kept fluffing my gear change coming out of the hairpin (Thanks to all the folk that missed me when I bogged down just in front of them. Must be a few with brown pants) I'm absolutely knackered today, I'd forgotten how hard work it was driving flat out for so many sessions
|
|
|
Post by NS-R on Mar 23, 2010 3:13:42 GMT
Glad to hear you're back at last Charlie - and you even stayed on the track! haha. All the best for 2010 to everyone - I'll be watching the results from Vietnam! Cheers, Nick. www.nicksandersonracing.comPS If anyone fancies an ST test or hire for the Cadwell Rounds, just let us know...
|
|
ianbru
Midfielder
Surprisingly, Ian Bru is not my real name! (it's Greg)
Posts: 96
|
Post by ianbru on Mar 23, 2010 8:37:47 GMT
Mike... very interesting reading... and invaluable info (especially for us first timers). I took a guess at pressures on my all too brief outing on Sunday (24F / 28R) but I had no idea if that would be suitable or not (and still don't after the minimal laps I managed). Sounds like the fronts wouldn't be too far away, but maybe I'll have to use a bit more in the rears as a starting point next time.
I also own a tyre temp guage and my plan was to do a bit of investigation as to how hot / cool they were running...... but that plan fizzled out along with my engine.
In fact if anyone wants to borrow the temp gauge tool at a next session (and if I'm not using it of course) you're welcome to it.
Cheers, Greg
|
|
|
Post by awsponsor on Apr 23, 2010 8:37:29 GMT
So what was the general verdict on the Yokos?
|
|
|
Post by Mike Strong on Apr 23, 2010 15:40:12 GMT
So what was the general verdict on the Yokos? The yokos seem to be less knife-edge than the kumhos but that's probably due to their softer compund. Personally I thought the yokos were less prone to locking in the wet and less savage when the back end stepped out. The yokos seemed to have a more sudden drop off in performance when coming to the end of their life - think rechargable batteries (kumhos) versus lithium batteries (yokos). As Peter C doesn't seem to know about this board , Tim is probably the best placed driver to comment on whether there's ultimately a performace advantage. But if there is then it's not very much. Chances are that the cars have been developed to such a point that the rubber they run on doesn't really make much of a difference.
|
|
|
Post by s3swiss on Apr 23, 2010 17:22:08 GMT
One thing I found was they definitely need a heat cycle (couple of laps max at race pace). Had one on front left which went off in testing on sat pretty quickly (dry track). As mentioned already, big difference when they do go off - felt like oil on track in the bends. Wheels Around reckoned we'll all need to adjust our suspension/driving style to suit the Yokos so I left my shox a bit softer than normal for Race 2 and that kept the grip working to the end. (Given the rivers on the track in Race 1 I'm ignoring that little outing..)
|
|