Discussion
Probably a better place to ask this question than where you did which is a dedicated hill climb forum. So asking a question there specifically about circuit racing doesn't look smart! 
I thought that I gave you enough information there to get you started.
But the game is called motor racing which implies a degreee of competition. Other drivers put a lot of their time, effort and not a little money into getting themselves and their cars going faster, so why don't you follow their lead? You can use Mrs G to find Avon Tyres and your local distributor and then ask them. They have a vested interest in selling you tyres, so can give you all the info you need on compounds, sizes and availability. That's what I did plus laying £1k+ out on a set of tyres and discovering if they worked for me at what pressures and chassis settings.
I thought that I gave you enough information there to get you started.
But the game is called motor racing which implies a degreee of competition. Other drivers put a lot of their time, effort and not a little money into getting themselves and their cars going faster, so why don't you follow their lead? You can use Mrs G to find Avon Tyres and your local distributor and then ask them. They have a vested interest in selling you tyres, so can give you all the info you need on compounds, sizes and availability. That's what I did plus laying £1k+ out on a set of tyres and discovering if they worked for me at what pressures and chassis settings.
To LCM;
I must have missed your other posting, but if it was as helpful as this one then i didn't miss much.
Why post to the Hill Climb forum ?
Easy, most SR8 owners on circuit will probably be doing the Radical series, and so will not deviate from the Radical gospel. Hill climbers have a tendency to be a more inquisitive bunch regarding car setup and a whole lot more likely to be using H100 hill climb tyres, which was the key part of that post.
If your not interested in sharing any info relevant to the question - then why bother replying to the post - just ignore it and move on.
I must have missed your other posting, but if it was as helpful as this one then i didn't miss much.
Why post to the Hill Climb forum ?
Easy, most SR8 owners on circuit will probably be doing the Radical series, and so will not deviate from the Radical gospel. Hill climbers have a tendency to be a more inquisitive bunch regarding car setup and a whole lot more likely to be using H100 hill climb tyres, which was the key part of that post.
If your not interested in sharing any info relevant to the question - then why bother replying to the post - just ignore it and move on.
308Racer said:
To LCM;
I must have missed your other posting, but if it was as helpful as this one then i didn't miss much.
Why post to the Hill Climb forum ?
Easy, most SR8 owners on circuit will probably be doing the Radical series, and so will not deviate from the Radical gospel. Hill climbers have a tendency to be a more inquisitive bunch regarding car setup and a whole lot more likely to be using H100 hill climb tyres, which was the key part of that post.
If your not interested in sharing any info relevant to the question - then why bother replying to the post - just ignore it and move on.
So, this wasn't helpful - "Have you thought of Avon A53?I must have missed your other posting, but if it was as helpful as this one then i didn't miss much.
Why post to the Hill Climb forum ?
Easy, most SR8 owners on circuit will probably be doing the Radical series, and so will not deviate from the Radical gospel. Hill climbers have a tendency to be a more inquisitive bunch regarding car setup and a whole lot more likely to be using H100 hill climb tyres, which was the key part of that post.
If your not interested in sharing any info relevant to the question - then why bother replying to the post - just ignore it and move on.
Avon make them for OSS so they are designed for '10 lap races'.
They are available in 15" fronts and 16" rear and are what I use on my SR8. I get mine through BMTR who normally carry stock in SR8 sizes. They also have the advantage of being significantly cheaper than A15 hill climb tyres or BIG R branded Dunlops!"
In that case you probably need a different kind of help................
And it might be worth remembering that in motor sport the best help is not always giving you the answer to the question you ask but showing you how to find it yourself. If you want I'll drive your car for you as well!
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LCM,
OK, you are running Avons, not sure if it's because their cheaper or that you just don't the like D/R situation.
But that said, would you willing to at least point the ignorant amongst us, in the right direction regarding camber and hot pressures.
Just a hint will do, we would not dare to ask more.
OK, you are running Avons, not sure if it's because their cheaper or that you just don't the like D/R situation.
But that said, would you willing to at least point the ignorant amongst us, in the right direction regarding camber and hot pressures.
Just a hint will do, we would not dare to ask more.
Simon T said:
Yeh, go on LCM give us all some extremely useful data that cost a lot gain.
Thing is, willi it be true?
As my old Origami Master used to say - "Borrocks"!Thing is, willi it be true?
Here's a guaranteed not to fail empirical method:
1 - ask your tyre supplier
2 - if they can't help, find a tyre supplier who can (eg BMTR)
3 - buy a set of tyres, fit them to your car and put on the initial settings recommended by your tyre supplier (you might as well check your corner weights at the same time)
4 - buy a probe pyrometer (not a surface reading one)
5 - take your car and pyrometer to the track of your choice
6 - after warming up and scrubbing in, drive the car for a few hard laps. Back in the pits, promptly take your tyre temperatures - inner, centre, outer and record them.
7 - think about the temperature profile. Obviously on a typical UK clockwise circuit you would expect the tyres on the left side to be hotter than on the right BUT consider the profile across each tyre. You should expect to see a gradient across the tread with the inner band being 5-10deg hotter than the outer. If the inner is too cool, then increase neg camber; if too hot, decrease it. If the centre is hotter than the outers then reduce tyre pressure and vice versa.
8 - repeat until you get the desired temperature gradient
9 - that will give you a good base position. It's then up to you to adapt it (and the other chassis settings) to suit your driving style.
10 - send me a large cheque.
Now go forth into the World, Butterfly and stretch your wings on a flight of discovery. For, through discovery and knowledge we acquire wisdom and take a step on the Path of Fulfillment..................
bloberoo said:
:-), I use " Crouching with tyre gauge, Hiding Data" !!! :-)
Love it! 
That one Ran and Ran didn't it?
( Clue for non-followers of Kurosawa's classic movies: www.youtube.com/watch?v=AbbfDntoRRk )
LCM said:
It certainly all turned a bit ugly that day at Curborough 
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