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...on tarmac what distribution would you have to get the most effective braking?..50/50..thats how mine are set currently...i have the correct girling units .65 and 70 also what would a tarmac saff car have in that era..6pot 355's?..what about rears?

Micky The Finn

girling!!

Martin-Hadland

iTrader: (2)

You will need it biasing towards the front rather than 50/50, I would start with most at the front and start winding on rear until you are happy with it. Bring it to Bedford and we can set it up there

Nothing wrong with them mate for the purpose Phil needs them for.

Micky The Finn

ive retired from three rallies in the last 3 years as a direct fault of girling products,each to their own i supose.and i agree,phil may not be putting them under the same strain.

pee vee

Would of thought its however the driver like the car to act?

if you want the back end a bit loose then have it further towards 50/50

if you dont really want to die entering the nearest roundabout, then more how a road car would have it ?? *



* i dont actually know, im just speculating

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..Cheers Martin..i will be doin track days WHEN its all done to my liking..and then any help setting up will be great..oh and driving lessons

Edit.....the crying was genuine as i have never been round a track!

Fudgey

iTrader: (4)

we had a group n fiesta st that we tested at brunters...

never tested the brake bias as it was fine on the road, but when i jammed on the brakes at 120 the rear end locked up and the fucker went rather sideways

god knows how i stayed off the grass and got it straight again..

i fookin shat myself tho and wound the front bias on some more

Stavros

and then you blew it up at castle coombe anyhow

Fudgey

iTrader: (4)

it was silverstone you cunt

purplemonster

you will find each car will be different and u will be adjusting the bias all the time depending on all sorts of things ,until you know your car and how your car responds to different settings ,thenfinal setting will be down to how you like the car,but as 75% of braking is done at the front your more likely to set the bias 75% to the front anyways

on my presnent car( cosworth puma ) my bias bar has such a fine thread on it im turning it for ages to adjust it,so ill be buying a digital bias gauge and modifying my pedal box to electricaly adjust my bias to make things faster to adjust

and by then i will know what pressure to have front and rear in different conditions etc

pee vee

didnt you get in a spot of bother for that one fudgee?

silly c**t

NUTS RuS

iTrader: (35)

purplemonster

Why not just change the balance bar to a more course pitch ?

How do you know they are 50/50 Phil ?

purplemonster

nuts rus .....now that would be toooo easy

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nuts the valve is in the middle...it seems to notch there if i turn it clockwise or anticlockwise so am assuming middle!

NUTS RuS

iTrader: (35)

And does that valve in the middle control both front and rear or rear only ??

Is it on the pedal box or rear line ?

Chip

iTrader: (3)

Thats probably the middle point between being say 20% to the rear and 40% to the rear, or similar.

NOT 50% to the rear.

As if its 50% to the rear in the middle, that would mean that one way it would be more than 50% to the rear, and you NEVER need that! (unless its a handbrake turn, lol)

foreigneRS

even if the valve or whatever is halfway, you have different sized master cylinders, calipers and discs, so the effort is not necessarily 50/50

have you ever seen a cowboy go rallying - yeehah

RichardPON

Absolutely.

You have a hydralic handbrake as well I presume Phil?

What size are your cylinders? .70 and.75 or something?

ian sibbert

It'l be a pressure reducing valve for the rears only.....

I hate them personally, they always seem like a cowboy fix for a problem tha can be dialled out with a correctly set-up pedal box.....

Phil,

What make is the valve and how many ports does it have?

RichardPON

Ian - I think he actually has a pedal box.

ian sibbert

Rich,

Yes I know he has a pedal box, and all the more reason for doing away with the rear pressure reducing valve, if you get my drift, people when they build cars fit bias pedal boxes, then fit a rear pressure reducing valve, cant see the point in them....if there is too much rear bias after full adjustment on the pedal box, fit the correct cylinder to correct the problem......

As you know I ran Sierra Saphs for many years, all on pedal boxes, with .625front and .7 rear, even on standard calipers they always had god brakes....never once had to use a rear pressure reducing valve.....

RichardPON

Ah right - I didn't know he had a pressure reducing valve as well!

We ran one for the 205 challenge, but only because pedal boxes weren't allowed in the regs.

Not sure why he has both though - as you say, a bit of a bodge when you can set it up perfectly on the box.

Chip

iTrader: (3)

I can see some value in having both personally.

Set it up on the pedal, with the rear reduction valve fully open (ie not doing anything) then you have it in the car to allow you to reduce the rear brakes if you need to cause something changes in terms of how much bias you want mid stage or similar.

Definately better set on the pedal box though

RichardPON

Most pedal boxes have the option of in car adjustment anyway though.

Fudgey

iTrader: (4)

very true rich, but if your in the middle of the forest and rains etc, bumpy as hell etc it will be easier and quicker to push a lever instead of twiddling your knob and get your hand back on the steering wheel faster

ian sibbert

Rich,

I am assuming, but i have seen this config on a few cars......could do with an interior shot of the now famous boschman rally car.......

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...as said i have .65 and .70 girling units..thats all i know at the mo...my only incar pic so far:-


you can see the silver knob..will be far better inside than current when finished

..yes rich hydraulic hand brake.

foreigneRS

that looks like a knob for the cable operated balance bar

markk

iTrader: (2)

i have never struggled to adjust the brake bias in the forrest from the pedal box, and have never had to run a pressure limiting valve.

a small story............................... years ago when i was inexperianced i fitted four pots to the front and rear of my 2wd car, i had a pedal box with .625/.70 setup and the braking was great...........as long as you didnt dip the clutch, if you did, round it went, had i changed the master cylinder or fitted a pressure valve then yes, that would have sured the problem, but is the fix not counteracting fitting the massive brakes to the rear ?

i actually took them off and fitted smaller single calipers and never had brake issues again for 8 years

ian sibbert

That is the cable operated bias adjuster for the pedal box itself.....

Does it indicate which way to turn for more bias? usually towards the front...

If it doesn't you could do with either examining the assembly yourself and sussing out the pivot point orientation or getting someone that knows what they are doing to have a look, and i'd suggest winding some more front bias on.

Make sure the bias bar if nice and free and can move easily on the threads, you could just be winding the cable up.....

You can never acurately predict a certain split front to back, you mainly get a feel for it once you drive the car......

Dash/interior looks tidy and funcational (just like a rally car should....)

Ian

NUTS RuS

iTrader: (35)

Dare we mention piston rod lengths yet or would that get too confusing ?

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..cheers ian just needs a tidy up...it has fuel/oil pressure gauges and water temp/boost..so everything important is there.

markk

iTrader: (2)

or floating cylinders