Tyre pressures on a 600kg kit??
Discussion
On a car that light you'll be able to feel when it's right. Too low and you'll feel the side-walls roll under as you turn in, everything just feels a bit vague; too high and grip levels will start to become more erratic on bumpy roads as you lose the element of suspension usually provided by the tyres.
I'd start at one extreme (probably about 25 since over-inflation within the tyre's spec wont damage it) then tweak them downwards a couple of PSI at a time until they feel right. Remember to run them for long enough each time to get them properly up to temperature; it makes quite a big difference. I'd guess you'll end up something along the lines of 20/22 hot which will be about 17/19 cold.
I'd start at one extreme (probably about 25 since over-inflation within the tyre's spec wont damage it) then tweak them downwards a couple of PSI at a time until they feel right. Remember to run them for long enough each time to get them properly up to temperature; it makes quite a big difference. I'd guess you'll end up something along the lines of 20/22 hot which will be about 17/19 cold.
Edited by kambites on Monday 25th April 08:50
When was researching this for an article I found a procedure which, though time consuming, should get you the right answer in the end.
Basically, when the tyre pressures are correct they should increase by 10% from cold to normal driving temperatures.
What you need to do is to pick some cold inflation pressures, drive the car around 'normally' then measure them when hot.
If the pressures have increased by less than 10% they need reducing and if they have increased by more than 10% they need increasing.
Obviously the correct pressures will be different depending on the type of driving you do but this is true for all cars anyway.
Basically, when the tyre pressures are correct they should increase by 10% from cold to normal driving temperatures.
What you need to do is to pick some cold inflation pressures, drive the car around 'normally' then measure them when hot.
If the pressures have increased by less than 10% they need reducing and if they have increased by more than 10% they need increasing.
Obviously the correct pressures will be different depending on the type of driving you do but this is true for all cars anyway.
Sylvaforever said:
Sylva mojo 600kg wet, toyo 888 medium compound tyres
thinking 16ps at front [ish obs] maybe 20 at back due to weight distribution.
Yes I've no ideas at corner weights, but hey... lol.
I'd perhaps suggest a little more than 16 at the front, a little less than 20 at the back, but I'm guessing.thinking 16ps at front [ish obs] maybe 20 at back due to weight distribution.
Yes I've no ideas at corner weights, but hey... lol.
I run the 888s on my fury at 17 front & rear, so you're in the right ball park,
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