Club G40 Forum
Technical => Chassis & Braking => Topic started by: matthew85 on March 15, 2010, 04:03:26 pm
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Afternoon chaps..
What pedal boxes are people running? im about to upgrade the one in my mk1 polo, and obviously dont have provisions for a servo, so im looking into building a bias set up, but obviously there is a lack of space..
Thanks
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I've got a Tilton one but so far it's not made it any further than a shelf in my house. I've seen others who have used the floor mounted OBP one which is quite cheap to buy, they have also moved the seating position further back which not only helps to fit a pedal box like that in but shifts weight distribution to the rear a bit.
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i've got a universal bias box from rally designs, ive utilized the standard pedals, mounted the box in place of the servo and made up a puch rod bar to go between the brake pedal and the master cylinder push rod. The master cylinders are wilwood and the whole lot was approx. £140 iirc. The only problem with this is that the inner master cylinder sits super close to the fuel line on the fuel pressure regulator so this will need addressing but i thought that it would be easier to sort than mounting pedals within the car, upset driver position and also easier to get to to adjust etc etc..
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Oh man, im thinking about the universal rd ones, or something similar to hegs on cp..
the thought of a floor mounted box came to my mind and i am in the process of finalising the seating position so its on the cards, but all that means is more expenditure and more delay haha.
I need to weigh up the pros and cons....
Thanks guys
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jez pictures?
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moving the seating position backwards is a good thing, I'll be doing that anyway :) I'd probably be on with it now but my broken arm is stopping me from doing anything :(
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Best i got for the min...
http://s244.photobucket.com/albums/gg3/jez1272gt/?action=view¤t=PedalsandBalanceBarBox7.jpg
http://s244.photobucket.com/albums/gg3/jez1272gt/?action=view¤t=Pedalsandbox.jpg
ill put up one with the inlet manifold in place so you can see the serious lack of clearance too. Cant find a pic of the link bar i fabbed up either but i will get some more pics if you want...
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looks good more pictures always good! :)
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thanks for those photos....
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I experimented with this ages ago when i was trying to make my bay a bit neater.
i removed the setup after the cable clutch was shite - and i didnt have the resourses that i do now to put a hydraulic unit on the gearbox - or i would have kept it.
ok - i know its messy but i was doing some rewiring at the time on my dashboard and the whole loom was being taken out - hence the mess!
(http://www.youngprodigys.com/randoms/august09%20074%20(Medium).jpg)
(http://www.youngprodigys.com/randoms/august09%20078%20(Medium).jpg)
now sits in my "was a great plan at the time" draw, along with all my other daft ideas
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I've discovered that my pedal box makes quite an effective bookend on the shelf in my bedroom :D
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hahahahaha
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thanks for the photos
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Wat are the Main advantages of an uprated pedal box??
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It's all in the title really Terry. :D
It allows you virtually infinate adjustment of the brake bias from front to rear. Another often overlooked feature of an adjustable bias pedal box is it gives you options in brake pedal travel and weight due to the availability of different size master cylinders. This is important when you don't have a servo.
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I know this doesn't help you Mathew, but for information a bias brake set up which allows you to keep the standard pedal and servo is available from Demon Tweeks, but it ain't cheap at £346 +VAT and then you still need master cylinders at about £70+.
Do you really need to change all the pedals anyway for a full pedal box, wouldn't it be possible to modify the existing brake pedal arrangement to actuate the balance bar? (Just to be clear though, I've never taken the pedal or servo etc off my mk3 or any Polo, and I've not even seen a mk1 up close).
And to top off any balance bar arrangement you really need the remote dash mounted adjustment knob and cable. These are also expensive, at about £70 quid up, and for my kit car I had to spend nearly £90 on a little right angle adapter so the cable is clear of the other pedals. What's the point having adjustable braking if you can't change it whilst on the move? ;D
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Wat are the Main advantages of an uprated pedal box??
Along with the adjustment of the brake pressures front to rear,
- the pedal positions are often adjustable to suit the driver
the brake and accelerator pedal are close and level (ish) to promote easy "heel-toe" braking for 'proper' driving style..
they look good
they cost lots :D
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the mk1 polo doesnt have a lot of space past the bulk head, nor space for a servo thus finding a suitable uprated MC is hard.
The problem i have is that theres no room at all for a balance bar and mcs so i reckon floor mounted is the way forward in my case...
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How would you properly set up the brack bias?
just street test it ?
You see i am asking before My 40 is stripped out and the rear load sensor is been adjusted to give least effort to the back brakes. (as mine seams to lock up on the rear quite easily)
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Tez, if you've lowered the car then the load sensing valve will behave as if the rear of the car is heavily loaded, hence the increased rear brake force and necessary adjustment. Should really be done at a garage using rollers, but on the road testing and adjusting may get you close.
Even with a balance bar set up there may still be the need to have a restrictor in the rear line, so you can't get full rear braking and no front at all! Master cylinder sizes also play a part in this.
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obviously, when buying the components ill ask for their advice
I will also be running a hydraulic handbrake
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if or when i got my car on the rollers?
how would you know wat figures to go by?
am i working on a percentage? e.g 70% at front 30% at back?