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DGorman

Joined: 19 Jan 2009 Posts: 880 Location: London
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Posted: Sun Dec 18, 2011 1:00 pm Post subject: Re: Aixro Club180 race series Tyres |
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| xratedkarting wrote: | For some time during 2011 I have been asked if we may be able to use a softer tyre over the Dunlop DCH ones allowing the Aixro to even better lap times, I have resisted due to wear rates and therefore costs.
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You'd have to be pretty spot on with choosing which brand/model of tyre you use. I'd guess a knackered set of soft tyres (e.g. DDS) would still be far quicker than a set of DCHs. |
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alexp

Joined: 01 Mar 2008 Posts: 198 Location: london
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Posted: Sun Dec 18, 2011 6:42 pm Post subject: |
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DDS would mean more load on the (my seemingly fragile) ribs.
You guys use DDS, Ill stick with DCH and take my 20kg of lead off? Is that fair  |
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kai

Joined: 27 Sep 2006 Posts: 1265 Location: Southeast England
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Posted: Sun Dec 18, 2011 10:09 pm Post subject: |
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Ah, this is really getting tricky now. Come to think of it (not for the first time), I’d like an OAP discount from my lap times!
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So, we’ve all just had the first email circular on next season’s details and the invitation to vote on (dry) tyre choices / arrangements for 2012.
Being awkward, how about including use of the medium tyre (DDM) on the ballot?
We know that DCH/DDH tyres are good for one race meeting plus a good deal of subsequent practice. But we don’t – or at least I don’t – really know about the useful life of the medium and soft options. I know the proposed formula of using the hard/soft sets for 2 meetings each addresses that to some extent, but more specifics would be good to have. |
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Antoine

Joined: 07 Jun 2009 Posts: 268 Location: Eastleigh
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Posted: Mon Dec 19, 2011 6:58 pm Post subject: |
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The Medium (DDM), could be a good compromise as a single tyre.
I think the best would be to try the 3 tyres back to back to compare the experience and to run these 3 tyres at one track to compare the duration, but I bet something like: DCH: 3 days, DDM: 2 days, DDS: 1 day with one day being approx. 60 minutes.
Anyway thinking more about getting to softer tyres: driving a soft tyre is much more fun but is racing soft tyres more fun? The more the grip the less passes (compare F1 20 years ago and now!). So I am not too sure now...
On this basis I am throwing another idea: all racing on DCH but we do qualify at every races on soft tyres, with an allocation of 2 soft tyres for the entire season. At PFI we are already doing qualify and I think it would be a shame to do it for all other races as the heat formula is great. So we could add qualify on top of the heats at the beginning, the result would count like a heat in the place for final and maybe give some championships points. I think this would be a good compromise for having soft and hard tyres |
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aixroboy

Joined: 28 Jul 2010 Posts: 80 Location: Stekene Belgium
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Posted: Mon Dec 19, 2011 7:27 pm Post subject: |
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nice idea for the tires but think good on how difficult it will be to control all this many discussions will follow
hard tire or soft tyre is ok but everyone on the same tire at the same moment
i do not think that many drivers in the aixro series have the knowledge for setup and driving 2 sets of different tyres in 2 races with the material they have
nice idea on putting me and bjorn on the hard tyre but not fare i think |
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alexp

Joined: 01 Mar 2008 Posts: 198 Location: london
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Posted: Mon Dec 19, 2011 7:36 pm Post subject: |
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| aixroboy wrote: | nice idea for the tires but think good on how difficult it will be to control all this many discussions will follow
hard tire or soft tyre is ok but everyone on the same tire at the same moment
i do not think that many drivers in the aixro series have the knowledge for setup and driving 2 sets of different tyres in 2 races with the material they have
nice idea on putting me and bjorn on the hard tyre but not fare i think |
"i do not think that many drivers in the aixro series have the knowledge for setup and driving 2 sets of different tyres in 2 races with the material they have" Agreed, that includes me!
"nice idea on putting me and bjorn on the hard tyre but not fare i think" Im sure they only suggest that very tongue in cheek!  |
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alexp

Joined: 01 Mar 2008 Posts: 198 Location: london
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Posted: Mon Dec 19, 2011 7:42 pm Post subject: |
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I like Antoine's idea of qualifying on softs and race on hards. That's more like F1 of old, though without the jungle juice quali fuel.
Also Jurgen's point on same tires at the same moment, is a strong point. I think i'd get quite frustrated being caught by someone I knew was slower and likewise not being able to catch someone I am faster than due to a huge difference in grip, sure the reverse may be fun when im on the softs but that's not realty in a way, it's a false economy of sorts.
Last edited by alexp on Mon Dec 19, 2011 11:13 pm; edited 1 time in total |
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aixroboy

Joined: 28 Jul 2010 Posts: 80 Location: Stekene Belgium
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Posted: Mon Dec 19, 2011 7:50 pm Post subject: |
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to complicated antoine all these rules i think
not true antoine for the soft tyre to have less passes you can brake much later more corner speed etc .....
in lydd we tested this year the difference of the hard and the medium was about 0,8 seconds a lap
if you only drive 3 heats 10 laps and 1 final 12 laps you can also use the medium tire for next training we do it in europe even with the soft tyre and we run 3 heats of 22 laps
keep it simple guys it is already difficult for everyone to get everything setup right just imagine you have to change each time tyres and setup between heats
for example you come in from quali with softs and need to change everything to hard tyres
you need extra set of rims may be change the sprocket and chain maybe another axle or setup of the seat and seatsupports camber caster torsion bars etc.....
the drivers who can do this quick and have the knowledge for this will be even faster then. if you do this it will be for some drivers even harder to drive in the front
sorry not a good idea i think
keep it simple and easy for all the drivers |
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Antoine

Joined: 07 Jun 2009 Posts: 268 Location: Eastleigh
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Posted: Mon Dec 19, 2011 8:29 pm Post subject: |
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I agree it might become a bit too complicated having 2 types of tyres
However on the soft reducing passes I am pretty sure of my point:
with soft you can indeed brake later but it is true also for the guy defending, the corner speed is high indeed but it means the difference of speed between straight and corner is less important with soft. All this means that the braking time is reduced, at the same time the difference between ideal time for braking and time where you have to brake else you miss the apex is also reduced hence pass harder. That's exactly the problem of modern motorsports. So for racing interest, I actually think hard tyre is better.
Anyway, I think it's best to take decisions to keep our racing as enjoyable as possible (=simple?) |
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aixroboy

Joined: 28 Jul 2010 Posts: 80 Location: Stekene Belgium
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Posted: Mon Dec 19, 2011 8:46 pm Post subject: |
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antoine with the hard tyres is passing on the dirty line much more difficult then with a soft tyre certainly on tracks with low grip like LYDD and teeside but we will test it next time now you also drive crg me and you and 2 sets of tyres
im looking forward to this  |
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xratedkarting
Joined: 02 Mar 2010 Posts: 73 Location: Worcester
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Posted: Mon Dec 19, 2011 10:07 pm Post subject: |
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Well chaps, this all good stuff. If we used the DCH ( Hard) and Vega white as the soft tyre ( we would be able to police the driver tyres choice easier).
As has been mentioned in Mike's latest email we will put the tyre choice for 2012 to the vote. |
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Antoine

Joined: 07 Jun 2009 Posts: 268 Location: Eastleigh
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Posted: Mon Dec 19, 2011 10:59 pm Post subject: |
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Jurgen, no point racing me on my CRG on any sort of tyres at the moment, I have not found where the throttle is yet )
Damn I knew it would not be easy to change chassis make at the begining but not that difficult... |
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alexp

Joined: 01 Mar 2008 Posts: 198 Location: london
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Posted: Mon Dec 19, 2011 11:19 pm Post subject: |
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ok, I back track...
Stay with DCH's.
Lower stress on body and kart parts.
2 tyres on the same day will be difficult re setup.
With DDS's snapping axles will be more common i'd imagine, as well as others parts that we haven't munched so far... |
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aixroboy

Joined: 28 Jul 2010 Posts: 80 Location: Stekene Belgium
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Posted: Tue Dec 20, 2011 7:34 am Post subject: |
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| Antoine wrote: | Jurgen, no point racing me on my CRG on any sort of tyres at the moment, I have not found where the throttle is yet )
Damn I knew it would not be easy to change chassis make at the begining but not that difficult... |
on the left antoine or is it on the right in the UK  |
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kai

Joined: 27 Sep 2006 Posts: 1265 Location: Southeast England
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Posted: Tue Dec 20, 2011 11:41 am Post subject: |
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| aixroboy wrote: | | ... may be change the sprocket ... |
Oops, I hadn’t considered that very good point. Given also that my favourite posture between heats is of being near horizontal on a comfortable chair (and not fiddling about spannering on my kart!), I find myself backing away from the 2-tyre option and veering to perhaps favouring just the medium.
Maybe you really can’t go from accountancy to lion-taming in one step: http://www.youtube.com/watch?v=XMOmB1q8W4Y |
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