Chris Leonard
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| posted on 19/4/04 at 01:07 PM |
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tyre sizes and pressures for self centring
I am trying to get self centring steering and it's proving a bit of a problem. Unfortunately I only have about 50ft of drive to test it on and
dont want to take the chance of blatting it down the road.
Anyway I have set some toe out but it still doesnt give the kick back that any 'normal road car' I have driven.
The SVA states a degree of self centring over 10mph - wants a degree? it doesnt seem to wander and brakes in a strtaight line.
Anyway - a question would tyre pressures and size make any difference - I still have the skinny MKII wheels will this help (they are about an inch or
so thinner than the RS wheels I have - What about an increase in tyre pressures?
Finally 'put a lot of toe out' - whats a lot! 5mm dif from front to back 10 mm.......
Cheers Chris
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stephen_gusterson
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| posted on 19/4/04 at 01:26 PM |
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its castor that primarily sets self centering ability - anything else is a bodge in my limited reading on the subject......
but this is a suspension related question, and therefore a minefield 
atb
steve
[Edited on 19/4/04 by stephen_gusterson]
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jimgiblett
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| posted on 19/4/04 at 01:35 PM |
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You could try lowering your tyre pressures as this will enhance the self centring. Castor is the way to do it and toe in/out is a bodge but
it's just for the SVA isnt it?
My 2p
Cheers
Jim
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britishtrident
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| posted on 19/4/04 at 01:43 PM |
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Try 16 psi --- don't go lower than 14 or higher than 22.
Give the front as much castor as is sensible try 5 to 6 degrees.
You can also get more self centering action by changing the king pin inclination ; the only way to do this as give it some negative camber try -2
degrees for SVA and put back to -0.5 to -1.5 degrees for normal road/track use
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Chris Leonard
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| posted on 19/4/04 at 02:32 PM |
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thanks....
negative camber - wheels out at the top:
\----/ ?
or in
/----\
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Peteff
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| posted on 19/4/04 at 04:38 PM |
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Wheels in /--\ neg wheels out \--/ pos. Try some skinny tyres with low pressure as well if you can borrow some.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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