Just thought I'd start a thread about cars for a change Anyone like to post up some tyre pressures (cold/hot) to help out others doing this evil past time ? I ran 4 psi differential front to rear on the QV for years (32/36 cold) running Michelin Sport and had the same differential when Toyo 888s were run (30/34 cold) I remember Horsey saying he ran 30 all round on his Toyos and other hotshoes have said similar. Has anyone done any REAL tyre testing of various tyre pressures to give me a good starting point for Toyo 888s on the 355 ? Currently running 30 psi all round ........ and don't mention 11 psi !!! I've tried it and like it for the road
No, I've always said I run 3 psi more in the front than the back. 33/30. Less understeer and better traction I have found.
This will be of interest to me, too. In a shock / horror moment, I got an email yesterday from the Adelaide Ferrari dealer asking for expressions of interest for a track day on October 1. Needless to say, I answered straight away. I've got Bridgestone RE050As at the moment, which I keep at about 33psi all round for the road (of course I've got no idea what I'm doing so that seems ok to me). All I have to do is get the car back on the road in the couple of weeks between returning from overseas and the 1st and I'll finally break my track-day duck!
I told you, I've got no idea. Better than 11psi anyway... Actually, the book is all over the place when it comes to pressures and it depends a lot on what tyres you are running. And of course, the tyres I'm running are not in the book. To make it worse, the sticker on the driver's door says 250kPa both front and back (which is about 36psi!) To illustrate my point, here's the book! Image Unavailable, Please Login
No, but some have higher in the rear, and some have higher in the front. And there is as much as 11psi difference, depending on the make of tyres?! So, in the absence of any worthwhile information, 33 all round will do for now. What do you suggest?
Not SOME...ONE of them has higher in the back. I always ran 34f 32r on the road. I never had "normal" road tyres on the track.
So, to summarise you recommend 34 front and 32 rear, and you're poo-pooing me running 33 all round. Got it
+ or - 11 PSI,relative as to how much,3 seconds you want to be,either,in front,or behind,the next bloke.
Which is 32 / 36 with the 'magic' 4 psi difference that I recall all the Qld gurus promoting some yeas ago... And which seems to work perfectly fine for me.
Yes, I concur. So you must be incorrect. For track use, I run Toyo R888s at around 27 psi. There are quite a few 944s, 944 turbos and 968s in the groups that I run in. We are all around 26-28 psi cold on either Twin Groove Hoosiers or R specification tyres.
No wonder this is confusing! Your sticker says higher pressure at the rear, some people say higher pressure at the front, the book is all over the place, and My sticker says a different thing to yours! Think I'll stick with 33 all round on the road, and drop it a few psi on the track.
11 PSI in the tyres, rear 14.5 PSI in the tyres, front 187 PSI in the rims front and rear 47 PSI in the sun visors 33 PSI in the clutch.
