[DeTomaso] Booster talk

[Tomas Gunnarsson]

> In a message dated 7/17/09 23 33 47, Thomas.Tornblom at Hax.SE writes:
> 
> 
>> It will still require a fair amount of pressure before it starts 
>> reducing the pressure.
>> 
>>>>What makes you say that?   I was under the impression that a 
> proportioning valve does just that--convert X amount of inlet pressure into Y amount of 
> outlet pressure.
 
>>Not at all. Up to pressure X the valve does nothing. Above that the pressure rises slower than the unregulated circuit. 
Like the white curve: http://pages.sbcglobal.net/jcuadra/brakes/brakedist.gif
 
>>  It will have too much pressure on the fronts 
>> until that happens. I want well balanced brakes throughout the entire 
>> range.
>> 
>>>>Which is exactly what you should get.   You wouldn't want a non-linear 
> system where you got equal pressure until some threshold is reached and then 
> the pressure reduces from there.   You'd want the reduction to be constant.

>>On the contary, ideally you'd want the rear pressure to drop off gradually with increased master cylinder brake pressure like the softer curve in the pic above.
 
>> Come to think of it, having the prop valve in the front cirquit is a 
>> stupid idea. During hard braking you get weight shift to the front, 
>> and what you need then is to reduce the force on the now lighter 
>> loaded rears to avoid having them lock up. 
>> 
>>>>The weight transfer is so instantaneous that you wouldn't gain anything 
> by having increased pressure to the rears initially, then dropping down to 
> 'proper' balance.   You'd want them to be proper all the time.
 
>>The weight transfer is proportional to brake force and each rate of decceleration would require a different ideal brake balance.
 
Tomas
 
 
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