Peter
I am in 100% agreement that drivers should experiment with tyre pressures for each type of driving they do.
With my (TR engined) +4 I needed to run higher front pressure than rear to help minimise the understeer. On the road I would run 24/22 for light loading , and 28/26 for heavy (I had an 18 gallon "Sebring" tank)
For circuit racing I used to start with 38/36 on road tyres (otherwise the tyres would rolloff the rims under limit cornering) , but 26 all round on racing tyres (Dunlop M section radials , but I used the stickier 232 compound on the front and the harder 184 on the rear) The racing rubber was much more stable on the rims Most drivers vary the pressures according to the circuit and the conditions on the day.
From his autobiography we learnt that Lawrence used 50 all round on his Dunlop L section cross ply racing tyres for Le Mans, but that is a very specific task.
Now I would not dare advocate that drivers change tyre pressures for each drive , but develop a range that they are happy with from previous experimentation. Your range of 22 to 26 would suit the +4 , I think the lighter 4/4 could possibly be a few psi lower and the heavier +8/Roadster a few more.
Personally I found 24 psi all round when touring with my +8 is a good compromise, and with a full load about 2psi extra in the rears. However with the SSL front/rear suspension I think I will try some further experimentation. The more compliant ride leads me to think that I can raise the pressure an amount , but the greater grip suggests that I could lower it . As soon as the salt disappears from the SE UK roads I will doing some trials.
