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Post by BikeTuna on Sept 22, 2016 11:53:17 GMT
On track I'd be running 26-28psi due to running temps, but I was all over the place last time, really struggling for grip. Most likely my ham fistedness, but I'm thinking pressures may be the key...
26psi might be ok for proper track use, but with a Solo, you are only really pushing the car for 60 seconds, and then you are waiting 15 or so minutes between runs, so everything cools again. You aren't going to have tyre temp from the off, and not really get full grip and heat until over 1/2 way through?
Would it not be better to run road pressures?
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Post by wannabe on Sept 22, 2016 13:00:11 GMT
Am I right in thinking that decreasing pressure will cause the sidewalls to bulge a little, meaning more tyre footprint on the floor and therefore more traction?
Might mess up the handling if they are floaty like a boat, though lol
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Post by BikeTuna on Sept 22, 2016 14:50:24 GMT
I believe that when the tyres are really hot (like they would be with track abuse) the air expands causing pressures above the normal and the tyres bulge in the centre causing less grip - so you lower the pressures to compensate and get the tyre back to its correct shape.
and this works on track where the tyres are hot, I run my bike at 24psi front and rear on track and 30 on road, and id probably do the same on the car but with a solo the tyres are not retaining the heat as the sessions aren't long enough...
...are they? that's the question...
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Post by Horney on Sept 22, 2016 15:22:10 GMT
I've al aye run road pressures on solos.
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Post by Meerkat on Sept 22, 2016 15:33:20 GMT
Just found this on Wikipedia: en.wikipedia.org/wiki/Cold_inflation_pressureMy maths is not great but it would seem that the basic rule of thumb is 10°C of temparature change = 1psi difference in pressure. The question is whether the tyres would heat up that much on a solo. I would say probably not, because the main cause of tyres getting hot is the constant flexing they undergo when they contact the road surface. This is increased exponentially with speed, which solos don't have much of. Also, if one was being really technical, the higher the tyre pressures are, the less they will flex and therefore the less they will heat up. Of course it would depend a lot on ambient conditions, on a hot day when they are constantly in contact with hot tar, then they may pick up quite a lot of heat. I would say this would have a far greater effect on the tyre temparature than the actual action of the wheels.
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Post by sandys on Sept 23, 2016 19:09:36 GMT
I tend to go lower than road, I find solos more abusive to tyres than track, I use similar pressures to what you mention in first post but have only done so on the Mazda, on other cars I solo'd I used 5psi more than road but that belp keep shape on low profiles to stop rim hitting ground and bring the rear into play on my Abarth Punto.
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