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I have put 30 in the front and rear and the handling has got twitchy so before I adjust them I just thought I would ask what is best for the handling ?
You say it's "got" twitchy, what did you have in there before?
You should have a higher pressure in the fronts compared to the rears for a balanced car (to compensate for the front heavy weight distribution). Look on the sticker inside the passenger door, IIRC it recommends a cold pressure of 34 PSI front and 30 PSI rear.
Unless you're into spending money on brand new tyres, tread depth gauges, temperature probes and getting the same driver to pound around the same track doing consistent lap times ...then there's not really any point in putting much more thought into it.
its just that I put it into a bend the other night and it just didn't feel as sure footed as it has always done at the same bend and speed ( probably too quick) It over steered quite unexpectedly and I laid an egg nearly
i know people are going to say too much speed etc but it wasn't excessive for the bend!!!
I have no knocks on the suspension etc
failing that which suspension components do I need to check?
Oversteer would be associated with the rear pressures being too high compared to the front, which is the "odd" way around (usually, with the front wheels being driven and doing the majority of the work during cornering and braking, you'd expect the fronts to spiral upwards if anything)
Knackered rear shocks are a very common cause of oversteer. Look for signs of oil leaking from the damper. If you feel like removing the shock, then check that it "springs" back after you compress it.
EDIT: Oh and not forgetting the obvious, old tyres (grip is reduced through all these heatcycles, so it's not all about tread depth) or worn tyres etc.