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my bike powered car


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#31 mini 1000 gsxr

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Posted 03 January 2006 - 10:56 PM

the pedal goes about half way. with the brake bias being adjusable in the car i have had really good brakes no lock ups just a little travel on the pedal

cheers ANDY

#32 neil_g

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Posted 04 January 2006 - 09:24 AM

Is that a KAD bias pedal box i can see lurking there on the bulkhead??
What size cylinders are you running ? .625 for the front and .75 for the rear?
What front brakes have you got on it ??

Mark :wales:

slightly off topic, sorry..

asked colin at KAD about m/c and the bias setup a little while ago, here is his reply:

For most applications we supply 5/8" front and 13/16". This works for a
>> standard-ish F-R weight distribution. Where the car has been lightened a
>> great deal at the back then a larger rear master cylinder is used which
>> provides lower line pressure for a given stroke. The drawback to this is
>> only cost as we then cannot use the lower priced integral reservoir
>> cylinders and have to use the remote reservoir ones which are more
>> expensive and add the complication of  siting the reservoir at a point
>> where the fluid can gravity feed the cylinder.
>> 
>> The whole subject of wheel lockup gets complicated by the vehicle dynamics
>> under braking, weight transfer occurs and this primarily depends on the
>> combination of height of the centre gravity and the front to rear weight
>> distribution. If the back is lightened by taking out the rear subframe
>> then the weight distribution alters unfavourably as far as wheel lock up
>> is concerned, there is less weight available for tyre adhesion and the COG
>> height remaining essentially the same. Hence less rear braking is
>> required.


hope that helps :dontgetit:

#33 mini 1000 gsxr

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Posted 04 January 2006 - 04:19 PM

well it works for me and anything is better than the standard setup. because i know someone that drove zcars demo car and said that the brakes were sh*t* my car cant be that bad i bet the zcar mote carlo at my local sprint ok it was wet lol

cheers ANDY

#34 R1minimagic

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Posted 04 January 2006 - 07:33 PM

I wouldn't say my brakes are sh*t, if anything they feel too powerful. My main problem is rear lockup under moderately hard braking. I have KAD 4 pots on front and rear sierra calipers, late type servo and still using the standard pressure reducing valve on the bulkhead.

The rear surface area with the sierra calipers is about 5-6 times that of a mini brake cylinder so that explains why they are locking up. I am a bit puzzled why other people with a zcars kit haven't come across rear lockup, unless nobody has used one properly on a track yet?? Surely Lee Olivers white mini would have been the same?? I know my car is quite a bit lighter than most of the others but it shouldn't make too much difference should it?? I think the rear end weighs about 260Kg..

My brakes were sh*t to begin with but a new set of front discs and pads made an enormous difference.

#35 mini 1000 gsxr

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Posted 05 January 2006 - 01:06 PM

when i used to race my car before i converted it to bike power i used the old type master cylinder with metro 4pots up front and a bias valve. the bias valve was closed at the rear and the brakes were brilliant so when i converted i left the master cylinder alone but the brake pedal went to the floor so i bought the kad bias andit works really well on the track


cheers ANDY

#36 R1minimagic

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Posted 05 January 2006 - 06:35 PM

Andy

which master cylinder are you talking about, there are many types?

#37 mini 1000 gsxr

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Posted 05 January 2006 - 10:13 PM

the large cooper s type

#38 dean_chad

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Posted 06 January 2006 - 07:07 PM

alright would this not come in handy for adjustment of rear brake force? just a thought!

http://www.demon-twe...code=GDR90-1000

:tongue:

#39 R1minimagic

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Posted 06 January 2006 - 07:19 PM

Yes thats the idea, but an infinitely adjustable rather than the detent type.

#40 dean_chad

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Posted 06 January 2006 - 07:25 PM

ahhh right so you wouldnt go down that route? i was thinkin of this idea for mine, have it adjustable for track and road use, there are several different types that was an example. think it would look trick set in car too

#41 R1minimagic

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Posted 06 January 2006 - 07:28 PM

Like this one

http://www.tiltonrac...list2&id=38&m=b

#42 chocolate jazz

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Posted 06 January 2006 - 07:35 PM

i no it maybe a stupid question to sum of you lot, but how exactly does this pressure regulator work :grin:

cheers

#43 R1minimagic

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Posted 06 January 2006 - 07:48 PM

When the inlet line pressure gets to a certain, preset, value it will not let the outlet pressure rise any more. So you can use it to limit pressure to the rear brakes under heavy braking thus reducing lockup under weight transfer to the front.

You can also change that pressure depending upon the conditions, eg. road surface, wet, dry etc so they are usually in car adjustable.

#44 chocolate jazz

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Posted 06 January 2006 - 07:55 PM

sweet i wont 1

#45 mini 1000 gsxr

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Posted 07 January 2006 - 12:14 PM

only prob is that they dont work as good as a bias pedal box


ANDY




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