Porker Posted August 1, 2017 Share Posted August 1, 2017 Guys & Gals, see below from the Michelin Michelin web site What pressure should I use for track driving with Michelin road tyres (e.g. MICHELIN Pilot Sport 3 / MICHELIN Pilot Super Sport tyres)? For Michelin road tyres, we suggest “hot” track pressures around 0.3 bar (4 to 5 psi) above the standard recommended cold tyre inflation pressures. If your tyre pressures are too low, this can lead to excessive flexing of the sidewall, a sensation of sponginess, a lack of steering response and abnormal wear. Pressures that are too high can lead to reduced grip, light steering, and even localised overheating. I normally let air out after a few laps to get to the road pressure, will try this next time. Well worth getting a decent tyre pressure gauge, can pick them up for £10 or so from the usual sites. After a few laps the tyres get VERY hot and run well over 10psi more than normal. Link to comment Share on other sites More sharing options...
Mk1 Posted August 2, 2017 Share Posted August 2, 2017 Also ... Cold inflation recommendations are usually for an ambient of 20`C, setting pressures outwith of this will affect your readings slightly. Link to comment Share on other sites More sharing options...
Porker Posted August 2, 2017 Author Share Posted August 2, 2017 1 hour ago, Mk1 said: Also ... Cold inflation recommendations are usually for an ambient of 20`C, setting pressures outwith of this will affect your readings slightly. Not sure temperature 'Hot' is but probably not worth obsessing about. Last time i went out hard straight after lunch and almost spun (PSM went nuts and got me pointing roughly in the correct direction) Link to comment Share on other sites More sharing options...
Mk1 Posted August 2, 2017 Share Posted August 2, 2017 `Hot` ... is the stable pressure (and temperature) that you reach after several laps. I used Michelin Pilot Sport Cup 2`s on track, they stabilised at 6psi (hot) above cold set for the number of laps that I did each session... which is at the top of Michelin`s operating parameter for them. If they had increased any further I would have bled them down a bit. Did you warm the tyres / brakes up prior to `going hard` ? ... switch the PSM off on track. Link to comment Share on other sites More sharing options...
Porker Posted August 3, 2017 Author Share Posted August 3, 2017 14 hours ago, Mk1 said: `Hot` ... is the stable pressure (and temperature) that you reach after several laps. I used Michelin Pilot Sport Cup 2`s on track, they stabilised at 6psi (hot) above cold set for the number of laps that I did each session... which is at the top of Michelin`s operating parameter for them. If they had increased any further I would have bled them down a bit. Did you warm the tyres / brakes up prior to `going hard` ? ... switch the PSM off on track. Yep, all of that. I'm at Rockingham today (I'm on leave so have squeezed in an extra one). Great day so far, a bit wet this morning so chickened out of turning PSM off, will turn it off this avo now that ive got my eye in. I had a lesson so understand the lines a lot better - after he barked them into me, I'm a poor pupil. It's a great track, you get to go on one of the banked turns on the oval before rejoining the normal track. The solid concrete wall is a bit sobering but as its banked and very wide its no biggy in these cars. There's a trick chicane that i kept buggering up, also the first turn off the banking onto the inner track. The lesson sorted it. Link to comment Share on other sites More sharing options...
Porker Posted August 3, 2017 Author Share Posted August 3, 2017 14 hours ago, Mk1 said: `Hot` ... is the stable pressure (and temperature) that you reach after several laps. I used Michelin Pilot Sport Cup 2`s on track, they stabilised at 6psi (hot) above cold set for the number of laps that I did each session... which is at the top of Michelin`s operating parameter for them. If they had increased any further I would have bled them down a bit. Did you warm the tyres / brakes up prior to `going hard` ? ... switch the PSM off on track. Sorry, misread your post. No, when i spun at Snetterton I hadn't warmed up with predictable results. Not so much on the brakes but the tyres have a huge amount of extra grip after some heat, only for a few laps though being road tyres though. No dramas so far today. Link to comment Share on other sites More sharing options...
Mk1 Posted August 3, 2017 Share Posted August 3, 2017 Thank you for the feedback. If you fancy some Pilot Sport Cup 2`s ... I have four fronts and two rears for sale (235/35 x 19 - 265/35 x 19). Link to comment Share on other sites More sharing options...
Mavrik Posted April 24, 2018 Share Posted April 24, 2018 (edited) I run my Mich sports at 28psi front & 33psi rear cold (on track)... Is this wrong then?? .. I've always been told to lower the pressures for track as the "hot" pressure will be waaay above the standard? Edited April 24, 2018 by Mavrik Link to comment Share on other sites More sharing options...
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