Tyre Pressure for HPE

[Fulvia 3]

Happy owner of a 1978 HPE 1600 since last month.
According to my Instruction Book, inflation pressure should be 24 psi !!
[27 psi when full loaded and 28 full loaded and constant high speed.]
According to a 1976 North American specs Instruction Book, inflation pressure is 28 psi (sounds logical).
For the first month I tried 27 psi and she drives nice. I cannot persuade myself to try 24 ....
What is your experience on the subject?

Thank you,
M

[HFStuart]

Maybe 24 on the back when empty but seems too low.

What tyre size?

I run 185/65 14 with 29psi all round (in a spider) and it works well.

[smithymc]

My handbook says the same for the coupe - I now run 26 all round one or two up on standard tyres.

Mark

[Fulvia 3]

What tyre size?

175/70-14

[HFStuart]

Reckon 27 all round would be about right then.

[Neil-yaj396]

The pressures in the handbooks always seem to be on the low side by up to date standards.

[lbcoupe76]

You have to take into consideration that every tyre manufacturer will have different sidewall construction and therefore different pressures. Tyres have changed a lot since those tyre placards where written. Look up the rule of four for tyre pressure, this works well. if you can't find it i will type it out for you.

[peteracs]

You have to take into consideration that every tyre manufacturer will have different sidewall construction and therefore different pressures. Tyres have changed a lot since those tyre placards where written. Look up the rule of four for tyre pressure, this works well. if you can't find it i will type it out for you.

Good call, I had forgotten about that. Here is what appears to be a good write up

http://cdn2.hubspot.net/hub/210453/file-20229690-pdf/docs/importance_of_optimum_tyre_pressure_and_temperature.pdf

Peter