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willwoods
Toady1 - 22/8/07 at 09:09 PM

are they worth the upgrade over the std sierra vented discs and callipers as i have on mine?

RazMan - 22/8/07 at 09:45 PM

In terms of braking power there is probably not a lot in it - however the weight saving is enormous!

locoboy - 22/8/07 at 10:29 PM

I have heard it banded about that you would need a larger bore master cylinder than the standard sierra one, or a twin master cylinder set up to get the most from these brakes as they need more volume of fluid pushed to them to operate the 4 pots to their max potential.

RazMan - 22/8/07 at 10:37 PM

I found exactly the reverse and went down to the smallest m/c bore size I could find (0.625" ) to get the maximum leverage (but longer pedal travel) I used 35mm pistons in the calipers.
I changed the pedal ratio too (5.5:1) and finally got the balance right but it was a lot of work.

[Edited on 22-8-07 by RazMan]

Hellfire - 22/8/07 at 11:10 PM

Not noticed any difference in performance but weight saving is 'indeed' enourmous!!!

Steve

nitram38 - 23/8/07 at 03:52 AM

My K-series calipers weighed 4kg each.
The wilwoods weigh 1kg each. A 3kg weight loss on a wheel is a lot, especially on a bec.

Toady1 - 23/8/07 at 07:10 AM

it all helps the unsprung weight then, if not the braking power! cheers!

bimbleuk - 23/8/07 at 07:59 AM

Don't forget the heat dissapation as the caliper bodies are aluminium.

jkarran - 23/8/07 at 08:39 AM

Mine (Willwood Powerlite 4pot) work fine off a 0.625" cylinder, the rears are Sierra and run off another 0.625" mc. To be honest, it'd be nice to have more cold bite from the brakes but that's just the lazy tintop driver in me who's used to servo brakes

The weight saving is huge and they're not expensive. I've got R1 radial calipers waiting to go on the rear at some point over the winter to save another 4 or 5Kg unsprung. They were really cheap

jk

cadebytiger - 23/8/07 at 09:43 AM

is loosing weight from the wheels better then?

is this due to some gyroscopic effect?

nitram38 - 23/8/07 at 10:25 AM

quote:
Originally posted by cadebytiger
is loosing weight from the wheels better then?

is this due to some gyroscopic effect?


Basically, the lighter your wheel assembly (all components including wheel etc) , the more responsive is the suspension to bumps etc.
It is a lot harder to control a heavy moving weight than a lighter one.
This will mean that the tyre stays longer in contact with the road.

[Edited on 23/8/2007 by nitram38]

Coose - 23/8/07 at 11:14 AM

With regard to suspension control and ride quality, losing x amount of unsprung weight is like losing the same amount squared from sprung weight!

nitram38 - 23/8/07 at 11:23 AM

quote:
Originally posted by Coose
With regard to suspension control and ride quality, losing x amount of unsprung weight is like losing the same amount squared from sprung weight!


I'd better cut a leg off then!