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Posted

Caterhams use an "above the pedal" type arrangement that Rob is describing.

I guess it depends on how dodgy the knee is and how much assistance/"extra leverage" may be required over and above the "standard" Westfield system. I'm struggling to come up with a remote servo that isn't on the large side and that will work without issue sucking a vacuum from a single DCOE throat. I'm not sure if the pulsing of the single tract will affect the servo function...

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Posted
I think there must be something in the air!! I got sin binned on pistonheads last night for somebody's inability to read posts constructivly and accuratly.

Sometimes it's not worth offering the advice  :bangshead:  :bangshead:

Good work Barry, best I've managed was an official warning for a specific insult I employed ;)

You're right though, sometimes it's not worth offering an opinion just in case some ****** misconstrues it and subsequently jumps down your throat.

Posted

:D:D:D:D:D:D:D:D:D:D

Nowt wrong with your memory Dern ;)

Posted

I would have thought there's not enough reserve travel in the brake pedal to make any significant difference to the force required by changing the leverage.  That's probably true of my floor mounted pedals. Not sure about the top mounted variety. If you have the pedal travel to do it, changing the master cylinder to a smaller diameter one might be an easier change to make than changing the mechanical leverage.

If it has to be a servo, Jenvey do a set of 4 pipes and collector designed for connecting an idle air valve to a set of throttle bodies. These could be employed in reverse to ensure the servo air went equally to all 4 inlets.

The Zetec engine has a channel in the inlet manifold gasket used to distribute the EGR gases between the cylinders. That would work nicely to drive a servo too. I use the same method to get a good MAP signal to my ECU.

In reality a servo will only intruduce air when the pedal is being released under deceleration so I'm not sure how badly it'd affect the engine if it was only fed by one pot.

The only se7en I remember seeing with a servo was a DAX Rush built by a disabled guy who had fitted an automatic gearbox and hand throttle / brake controls. The spare wheel carrier was re-employed as a wheelchair carrier. That had a fairly lairy pinto with twin DCOEs so it can be done. Fair play to the guy. I'm not sure I'd have the balls to drive a se7en with hand controls:0

Kevin

Posted
There is also another dax with ABS, traction control etc etc that uses a servo.
Posted
Mine is the top mounted pedal box and has had the leverage ratio changed so we know that works.
Posted

I'm not sure I'd have the balls to drive a se7en with hand controls:0

You wanna watch our friend Nopedals at a sprint. I don't think I've ever beaten him...

Posted

Pulling the servo from one throttle body only works just fine on the Mrs' Astra GSi...

However, I wouldn't recommend the use of a remote servo to be honest. Quite frankly they are just a little better than pants, especially on a very light car. The servo reacts by sensing line pressure, which, back at the brake pedal end, gives an on/off feel to the brakes. Not pleasant at all.

If you really need to fit a servo, it ideally wants to be an inline unit, behind the master cylinder. It's do-able, but, at this point you are making history as few have done it before. A few folk on the Locostbuilders website utilise servo's - Micra servo/master cylinder springs to mind as a nice compact unit. Chances are that you are gonna have to get the welder out though...

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