DallasQLD Lifetime Members 1,197 Member For: 22y 2m 14d Gender: Male Location: Albany Creek QLD Posted 01/01/03 11:22 PM Author Share Posted 01/01/03 11:22 PM My current car a 5 series BMW runs 38 to 40 PSI . I have had exeptional wear from the Pirellis fitted. Higher pressure is great for handling but its the waer that really wins out. Heat is the enemy of tyres and theyt run much cooler when inflated properly. Remember the car is heavy. 28-30 for my liking might feel good, but the waer will be high because of the heat.My WRX never had any less than 40 PSI and I got 45,000 out of the tyres. That included club events including three skid pan days which are very bad for wear.cheers Link to comment Share on other sites More sharing options...
Turbo6man Lifetime Members 4,084 Member For: 22y 4m 9d Gender: Male Location: South Coast NSW Posted 02/01/03 08:58 AM Share Posted 02/01/03 08:58 AM 32 psi is too low for low profile tyres. I run 40/36 with 40 series and probably would suggest 38/34 as a starting point with your 45 series. Link to comment Share on other sites More sharing options...
Mondie Firm Member Donating Members 2,924 Member For: 22y 3m 18d Location: Adelaide Hills Posted 02/01/03 09:24 AM Share Posted 02/01/03 09:24 AM Well, maybe my dealer was correct in putting 38psi in the tyres.Will have to go and buy a decent gauge and confirm pressures, but the car has an excellent ride especially if the tyres are actually running 38psi.Wonder why Ford recommend pressures that are so under that which seems to be ideal. Better ride perhaps? But at $550 a tyre for the Dunlops Ford are fitting to the 18" rims, l would hate to wear them out prematurely due to under inflation :( Link to comment Share on other sites More sharing options...
DallasQLD Lifetime Members 1,197 Member For: 22y 2m 14d Gender: Male Location: Albany Creek QLD Posted 02/01/03 11:52 PM Author Share Posted 02/01/03 11:52 PM Every manufacturer posts PSI as a compromise between ride and wear based upon their test results. Only problem is that test drivers dont buy and driver our cars! Take my Pajero for example. If I inflate them to recomended pressures by Mitsubishi, They squeal when I go around corners. If I inflate them to tyre manufacturers recomendations they are better and If I put more air in again , they handle and wear better again. If you were a tyre company giving advice about tyre wear would it biased to wear or "When can we get you back and sell you a new set"The Explorer roll overs in the US were caused by underinflation......These are high perfomance cars and the tyres are under a lot of stress when cornering and under acceleration. I will run 40 PSI and see how they go as a start.cheers Link to comment Share on other sites More sharing options...
Superoo Member 340 Member For: 22y 3m 18d Gender: Male Posted 03/01/03 12:01 AM Share Posted 03/01/03 12:01 AM Don't be scared to try slightly higher tyre pressures than what is recommended. Handling and wear will improve and the ride should not be too compromised.I got 82,000 km out of a set of RE92's on a VT wagon running at 36-38 PSI. The dealer changed them without asking and to be honest, if it was up to me I would have left them for another 5000. Link to comment Share on other sites More sharing options...
richdave SLOJAM, Gone but not forgotten Lifetime Members 1,841 Member For: 22y 4m 9d Gender: Male Location: Outer east - Melbourne Posted 03/01/03 01:12 AM Share Posted 03/01/03 01:12 AM 38/34 as a starting point with your 45 series. I'm confused here what do the 2 numbers seperated by the slash mean? front/back tyre presure, max/min pressure?? Link to comment Share on other sites More sharing options...
AMoffat Member 744 Member For: 22y 2m 12d Posted 03/01/03 04:13 AM Share Posted 03/01/03 04:13 AM normal and loaded with five adults and assorted bits and pices including caravan. Link to comment Share on other sites More sharing options...
richdave SLOJAM, Gone but not forgotten Lifetime Members 1,841 Member For: 22y 4m 9d Gender: Male Location: Outer east - Melbourne Posted 03/01/03 05:02 AM Share Posted 03/01/03 05:02 AM normal and loaded with five adults and assorted bits and pices including caravan. thanks AMoffat - that makes perfect sense now :D Link to comment Share on other sites More sharing options...
turbo_nick some guy... Member 277 Member For: 22y 4m 5d Posted 03/01/03 09:00 AM Share Posted 03/01/03 09:00 AM I tend to run higher pressures in all my tyres.15s - 36f 33r17s - 42/43f 40r19s - 40f & rI wouldn't run 17s below 38psi because the car would handle like crap, however this is only be because I prefer handling to comfort.I tried running 36 in my 19s and the car handled like a dog! 40 is just perfect!if you're going drag-racing, drop it to 25-30 for better traction though. Link to comment Share on other sites More sharing options...
Turbo6man Lifetime Members 4,084 Member For: 22y 4m 9d Gender: Male Location: South Coast NSW Posted 04/01/03 01:09 PM Share Posted 04/01/03 01:09 PM 38/34 as a starting point with your 45 series.I'm confused here what do the 2 numbers seperated by the slash mean? front/back tyre presure, max/min pressure?? Sorry mate, I was a bit vague there - I was referring to front/rear pressures. And if you are fully loaded or are going to do some track work you can bump them up by another 4psi or so.I generally run the rears a bit lower - to help with off the line grip and also if I want to induce a bit of oversteer when I'm pushing hard. Link to comment Share on other sites More sharing options...
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