SupraLEDrears Posted December 3, 2014 Share Posted December 3, 2014 So I put my winter tyres on the NA. Pirelli snowsport 240's. 265/35/18 on rear, 235/40/18 on the front. They all have around 6mm even tread left. Has a spirited 10 mile trip home after work then went shopping. Upon pulling away from a stop at the traffic light, into a 90 left turn, the rear end just came out as if it was icy. I've been through that turn about 500 times with summer tires and never had a problem. They make the back end seem very loose and this is worrying me a bit. Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted December 3, 2014 Share Posted December 3, 2014 Are you running much negative camber on the rear? Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 4, 2014 Author Share Posted December 4, 2014 Are you running much negative camber on the rear? Not great amounts. Had my geometry done about two months ago. Can't remember how many degrees though. Quote Link to comment Share on other sites More sharing options...
MadMax2042 Posted December 4, 2014 Share Posted December 4, 2014 Its not cold enough for winter tyres yet, anything over 8 degrees and they are slippy as hell. Soon as the temp drops they will be a lot more sticky Quote Link to comment Share on other sites More sharing options...
Ric Posted December 4, 2014 Share Posted December 4, 2014 6degrees and below, winter tyres come into their own. I have some on my Audi, in the UK they were a bit slippy, i drove over to Germany yesterday and it's -2, they are perfect. Quote Link to comment Share on other sites More sharing options...
Westcoaster Posted December 4, 2014 Share Posted December 4, 2014 From the AA's website: "Winter tyres give significantly improved handling and reduce stopping distances when the weather is cold (below 7C) and wet as well as when roads are covered in snow and ice." I don't put them on the Supra, but have them on my other two cars, one of which is fwd and the other, rear engine rwd. When the ambient temperature is above 10C, they will feel a bit skittish, but I still put them on between November and mid March as the road surface temperatures are much lower than the ambient temperature, especially first thing in the morning. On damp or wet roads when the temperature is Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 4, 2014 Author Share Posted December 4, 2014 Thanks for the replies guys. It was 2 degrees at the time of me driving and slipping... Quote Link to comment Share on other sites More sharing options...
Alex Posted December 4, 2014 Share Posted December 4, 2014 Diesel spill/coincidence? Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted December 4, 2014 Share Posted December 4, 2014 Sounds like you're not generating the required heat to get them to work properly. I'd look at suspension geometry... Quote Link to comment Share on other sites More sharing options...
Benjy Posted December 4, 2014 Share Posted December 4, 2014 Diesel spill/coincidence? My thought too. Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 4, 2014 Author Share Posted December 4, 2014 Sounds like you're not generating the required heat to get them to work properly. I'd look at suspension geometry... My thought too. It was after a spirited 10 mile drive from work. I only used that as an example as it was the slowest corner I took that day. It does it around several others too. Geometry was done and suspension checked end of October. Everything was fine up until I changed the tyres. I even did a few burnouts to see if I could cut into some fresh rubber. The Continentals were sticking like shizzle to a blanket and I had to actually make them lose traction. The only thing I haven't checked is the tyre pressures. I'm planning on doing that tonight. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted December 4, 2014 Share Posted December 4, 2014 It was after a spirited 10 mile drive from work. I only used that as an example as it was the slowest corner I took that day. It does it around several others too. Geometry was done and suspension checked end of October. Everything was fine up until I changed the tyres. I even did a few burnouts to see if I could cut into some fresh rubber. The Continentals were sticking like shizzle to a blanket and I had to actually make them lose traction. The only thing I haven't checked is the tyre pressures. I'm planning on doing that tonight. Ah! Pressures would have been the first thing I'd check! Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 4, 2014 Author Share Posted December 4, 2014 Ah! Pressures would have been the first thing I'd check! Naturally but I've not had 5 mins to myself!I normally stick around 35 psi in mine but someone suggested lowering it a bit with winter tyres. Don't know if it's true though. Quote Link to comment Share on other sites More sharing options...
CanisLupus Posted December 4, 2014 Share Posted December 4, 2014 Winter Tires can overheat pretty fast. Also they will never feel as stable as Summer Tires no matter what temperature you got on the outside. They have a far softer Rubber Compound and weaker side walls. I'm running 235 on 18" Hankooks all around in the winter and for 2-3Pulls they hook up very nice but the 4th pull you'll notice that they start to degrade because of the heat. Same goes for braking and cornering, at first they are okay but with more heat they get worse. The same will have happened on your spirited drive. Still, another Pressure may make it better Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 4, 2014 Author Share Posted December 4, 2014 Winter Tires can overheat pretty fast. Also they will never feel as stable as Summer Tires no matter what temperature you got on the outside. They have a far softer Rubber Compound and weaker side walls. I'm running 235 on 18" Hankooks all around in the winter and for 2-3Pulls they hook up very nice but the 4th pull you'll notice that they start to degrade because of the heat. Same goes for braking and cornering, at first they are okay but with more heat they get worse. The same will have happened on your spirited drive. Still, another Pressure may make it better Thanks for the info mate. Pressures were a bit off. One 35 and other 38. Dropped them down to 34.5 so will see what they say. Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 5, 2014 Author Share Posted December 5, 2014 Quick update. Grip has massively improved after dropping pressures but going to deflate them in increments of .5 psi and see what pressure works the best. Quote Link to comment Share on other sites More sharing options...
Ian C Posted December 5, 2014 Share Posted December 5, 2014 Even race cars don't go on half a psi steps, don't fool yourself that you'll notice a difference Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 5, 2014 Author Share Posted December 5, 2014 Even race cars don't go on half a psi steps, don't fool yourself that you'll notice a difference As long as I don't slide around I'm happy! Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 9, 2014 Author Share Posted December 9, 2014 Pirelli is so concerned, they are sending out an engineer next week to have a look. Quote Link to comment Share on other sites More sharing options...
supra matt Posted December 9, 2014 Share Posted December 9, 2014 Whats the date on the tires mate? Should not really be running tires older then 5 to 6 years, Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 9, 2014 Author Share Posted December 9, 2014 I'll have a look tomorrow when it's light. Quote Link to comment Share on other sites More sharing options...
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