Re: Assisted brake item
Posted by HH56 On 2012/10/27 10:03:28
As I understand it, the pedal ratio and your foot's input pressure is key to the output pressure. The vacuum booster only adds a set amount depending on several conditions. Once that set amount is reached there is no more to give.
Here is a partial chart giving calculated additional pressures for booster sizes we can accommodate. Threw in the 9 so as to interpolate for the 7" dual and 8" which is about all we can fit. Various vacuum conditions and assuming 100% efficiency. The article mentions that 85% efficiency is more the norm to be expected.
ECI also has a "brake pressure multiplier" in which a dual size piston setup increases pressure at slightly less volume. That one does require a longer pedal travel.
Attach file:
(11.89 KB)
Here is a partial chart giving calculated additional pressures for booster sizes we can accommodate. Threw in the 9 so as to interpolate for the 7" dual and 8" which is about all we can fit. Various vacuum conditions and assuming 100% efficiency. The article mentions that 85% efficiency is more the norm to be expected.
ECI also has a "brake pressure multiplier" in which a dual size piston setup increases pressure at slightly less volume. That one does require a longer pedal travel.
Attach file:
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