flidz101
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| posted on 27/4/06 at 08:53 AM |
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Bias box or proportioning valve?
Is there any real gain in a pedal bias box, or will a proportioning valve do the same job for a lot less money?
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mackei23b
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| posted on 27/4/06 at 09:05 AM |
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Hi there
For road use, a proportioning valve is just as good. Some benefit in competition to get the best set up and maximum braking for both wet and dry.
That said the adjustable bias pedals do look good!
Cheers
Ian
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britishtrident
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| posted on 27/4/06 at 09:06 AM |
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spot on advice
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MikeR
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| posted on 27/4/06 at 09:41 AM |
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and a cheap source of proportioning valves is old fiesta's. They screw into the master cyclinder.
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NS Dev
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| posted on 27/4/06 at 09:48 AM |
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Is that a proportioning valve or a residual pressure valve?
(I don't know, that's not a loaded question!)
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Marcus
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| posted on 27/4/06 at 10:48 AM |
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The way I read it, it's a pressure limiting valve to the rear circuit.
Marcus
Marcus
Because kits are for girls!!
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britishtrident
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| posted on 27/4/06 at 12:30 PM |
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Mondeo one is better bet --- higher pressure setting than the Fiesta
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gjs
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| posted on 27/4/06 at 05:34 PM |
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The ones off cars are not adjustable though,R they
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JB
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| posted on 27/4/06 at 05:55 PM |
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Bias & Proportioning valve
A bias box will give you the correct front rear bias for one set of conditions, ie the wet or dry. If you go from a grippy surface to a slick surface
then you would have to alter the bias for each surface.
The proportioning valve (as sold by AP) will allow the correct bias for all road conditions. The amount it limits is proportionate to the line
pressure. At low line pressures it does not limit but at high line pressures it does.
At low grip you brake less hard so there is less weight transfer so you need more braking to the rear, on ice it would be close to 50-50. On very
grippy tarmac it could be closer to 90% front and 10% rear.
So ideally you need both a bias box or proportioning valve.
John
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britishtrident
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| posted on 27/4/06 at 06:20 PM |
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quote:
Originally posted by gjs
The ones off cars are not adjustable though,R they
For road use it only gets adjusted once anyway and that has to be "on the safe side".
Presure limiting shut off valves actually work pretty well in all conditions.
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