Matthew Posted July 13, 2018 Share Posted July 13, 2018 Hi All, Just made the upgrade to R Compound Semi Slicks, NT01’s (100 UTQG), and had my first track day on them earlier this week. Previously I have used 595 RS-RR, RS-3 & NT05 UHP Tyres / ‘Street Semi Slicks’ with 200 UTQG Treadwear and ran 40+ psi hot routinely as they yielded the better lap times. What do others think though is the optimum hot psi pressure for R Compound Semi Slicks on our ISF’s? Thanks, Matthew Quote Link to comment Share on other sites More sharing options...
LTuned Posted July 15, 2018 Share Posted July 15, 2018 I found this on The Tire Rack web site. Tire Tech: Air Pressure for Competition Tires https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=58 I use Michelin Pilot Sport Cup 2 tyres at the track, & I run front 46psi hot, & rear 38 to 40psi hot. I look at the side walls of the tyre, & if I’m start to run on the side walls I increase the pressure by 2psi. the ISF is front heavy & needs more pressure in the front tyres at the track. Quote Link to comment Share on other sites More sharing options...
Matthew Posted July 17, 2018 Author Share Posted July 17, 2018 Hi LTuned! Many thanks for the feedback and pleased to note you find the higher pressures work better too! Good article on tyre pressures ... thanks for sending it through! Matthew Quote Link to comment Share on other sites More sharing options...
18ADF Posted July 29, 2018 Share Posted July 29, 2018 What size nt01s did u end up getting? Quote Link to comment Share on other sites More sharing options...
Matthew Posted July 31, 2018 Author Share Posted July 31, 2018 Sorry for the late response. I am running square set up ... 245/40/18 ... using the Lexus X Package wheels. Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted October 18, 2018 Share Posted October 18, 2018 i usually drop mine down to 30 psi as tyres get hotter pressure builds up Quote Link to comment Share on other sites More sharing options...
Matthew Posted October 19, 2018 Author Share Posted October 19, 2018 On 10/18/2018 at 5:39 PM, ilv1004s said: i usually drop mine down to 30 psi as tyres get hotter pressure builds up Hi ilv1004s, Thanks for your reply. Sorry to possibly ask a stupid question but is your response related to your starting ‘cold’ pressure and then when the tyres are hot they end up in the high 30’s or are you in fact running 30 psi when they are hot? Thanks in advance for clarifying. Matthew Quote Link to comment Share on other sites More sharing options...
ilv1004s Posted October 22, 2018 Share Posted October 22, 2018 generall you want to want to run less pressure as there is more contact patch to surface with out creating too much sidewall flex due to lack of pressure as for the psi going up as tyres produce heat and the heat expands the air in the tyres resulting in higher psi Quote Link to comment Share on other sites More sharing options...
Matthew Posted October 22, 2018 Author Share Posted October 22, 2018 4 hours ago, ilv1004s said: generall you want to want to run less pressure as there is more contact patch to surface with out creating too much sidewall flex due to lack of pressure as for the psi going up as tyres produce heat and the heat expands the air in the tyres resulting in higher psi Many thanks for the explanation. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.