It is currently Thu Mar 28, 2024 12:55 pm

All times are UTC [ DST ]




Post new topic Reply to topic  [ 17 posts ] 
Author Message
PostPosted: Thu Feb 05, 2015 4:36 pm 
Offline

Joined: Tue Apr 20, 2010 11:17 pm
Posts: 37
I have searched the forums and other areas of the web to gather the info needed to convert my sprint car to rear discs. I plan to keep using the 13'' wheels.

So far I have bought an hydraulic handbrake lever and bias pedal box from a Mk2 Escort that I intend to modify to fit.
P
I'm pretty clued up on RWD Fords but not on the FWD and newer stuff.

Am I right in saying I need the complete rear set up from the Fiesta ST150?

What Ford stubs have the caliper carrier built in already and what disc set up would allow me to run 13's? Not worried about the handbrake cable as it's purely a sprint car and doesn't need MOT.

I have an adjustable bias pedal box but would I still need to run a bias regulator inline?

Thanks in advance for any help.

_________________
Image


Top
 Profile  
 
PostPosted: Thu Feb 05, 2015 4:46 pm 
Offline

Joined: Mon Feb 09, 2009 8:40 pm
Posts: 7995
Location: rotherham,south yorkshire
St150 rear hubs,carriers,callipers,pads focus solid 250mm rear discs and pepper pots fit over the top :)

_________________
mk2 1.1L project in motion low and wide :)


Top
 Profile  
 
PostPosted: Fri Feb 06, 2015 2:03 pm 
Offline
User avatar

Joined: Sat Mar 14, 2009 1:39 pm
Posts: 1351
Location: Saufend (Southend)
I have Sierra cosworth rear brake set up. I think this is the old skool way of doing it. Sounds a lot easier with the st150 set up.

_________________
PS3 Tag: jhot80
My Diamond White 1986 Ford Fiesta XR2

Pop, Bang, Flame


Top
 Profile  
 
PostPosted: Sat Feb 07, 2015 10:23 am 
Offline

Joined: Mon Oct 13, 2003 2:27 pm
Posts: 1522
Because you have a hydraulic handbrake you don't need to follow the normal path, which is dictated by the need to have a caliper with a cable handbrake.

So, you can pretty much use any caliper you like on the back so long as you can mount it easily. I briefly had some Mk2 1100 front calipers on the back with some home-made brackets on my autotest car before going back to drums, which were actually better for what i needed, i.e. locking up the rear wheels.

Which leads me on to my next question. The main drawback to drum brakes is brake fade, not pure stopping power. For sprints, unless you're running 300bhp and slicks, you're not going to be running long enough to bake your rear brakes. Maybe a well adjusted and maintained XR2 drum setup might be as good? Lower unsprung weight too, which is king. Worth thinking about in terms of cash spent vs performance gained.

Your pedal box should have a balance bar that will let you set up the F/R bias, although I have no personal experience of these so could be wrong.


Top
 Profile  
 
PostPosted: Mon Feb 09, 2015 11:07 am 
Offline

Joined: Tue Apr 20, 2010 11:17 pm
Posts: 37
Thanks for the help. I was considering using the Sierra caliper option as I have that set up on my mk1 escort. Was thinking if the st hubs already have the carrier built in, would save time setting up the brackets.

In terms of using the drums over the discs, I really prefer the feel of a hydraulic handbrake. Apart from a few suspension issues, it was the handbrake that really faulted the car last year, snapping two cables too.

I've just acquired some ST hubs so will have a go at fitting then soon.

_________________
Image


Top
 Profile  
 
PostPosted: Mon Feb 09, 2015 11:23 am 
Offline

Joined: Fri May 23, 2003 11:04 pm
Posts: 22291
Location: County Durham.
If you can use the St callipers, use them instead of the sierra ones.
They are less than 1/5th of the price of the sierra callipers.

Jason.


Top
 Profile  
 
PostPosted: Mon Feb 09, 2015 11:36 am 
Offline

Joined: Wed May 18, 2011 6:11 pm
Posts: 2967
Location: S.E Kent
do you just chop the old stub off and weld the ST150 hub on? does it make it any wider or anything?

_________________
When you have a car that fast, a license isn't needed

ATW Motorsport

Follow my racing!
https://www.facebook.com/ATWMotorsport/
https://www.instagram.com/ATW_Motorsport/


Top
 Profile  
 
PostPosted: Mon Feb 09, 2015 11:58 am 
Offline

Joined: Thu Oct 14, 2004 8:15 pm
Posts: 2236
Location: Chip n' ham
basically yes you just chop off the old stub axle and weld a plate on the end so you can bolt on the Focus Stub Axles.

The main thing is to make sure you weld the new plates on perfectly square or your rear toe and camber settings will be all over the place.

_________________
Follow me on Twitter @OrbitalMSport


Top
 Profile  
 
PostPosted: Mon Feb 09, 2015 12:17 pm 
Offline

Joined: Wed May 18, 2011 6:11 pm
Posts: 2967
Location: S.E Kent
Can you then adjust camber with those hubs or do you need to put packs behind the hub to do that?

_________________
When you have a car that fast, a license isn't needed

ATW Motorsport

Follow my racing!
https://www.facebook.com/ATWMotorsport/
https://www.instagram.com/ATW_Motorsport/


Top
 Profile  
 
PostPosted: Mon Feb 09, 2015 12:33 pm 
Offline

Joined: Thu Oct 14, 2004 8:15 pm
Posts: 2236
Location: Chip n' ham
You would need to shim it to adjust camber.

_________________
Follow me on Twitter @OrbitalMSport


Top
 Profile  
 
PostPosted: Tue Oct 06, 2015 11:16 am 
Offline
User avatar

Joined: Sat Aug 08, 2009 1:12 pm
Posts: 233
Location: Belgrade, Serbia
Can anyone who's done a st150 or focus rear disc conversion measure how much the rear wheel sticks out from the standard setup? Or recommend the best setup which is as close to the standard wheel positioning, or sticks out the least?
Pictures are also welcome :)

I will be running 195/45/15 on 15x7 ET35 wheels - ford RS diamond cut. They don't fit on the standard 1.1 setup unless I use a small spacer so they don't rub on the suspension - this is an asumption, I'm making a 5mm spacer to try it out on the 1.1. If I use a big spacer (16mm), then the arch eats the tire - the car is lowered 40mm from a standard non-XR height.
As I am in the process of restoring a XR, I need to know what to expect with the disc conversion, as I don't want the wheels to stick out to much and rub on the arch/bodykit. I suspect that even without going to disc I'm going to have to role the arch a little bit, just don't want to much problem with discs.
There is an option to change the wheels and find some narrower ones which will fit, but either way I don't want to spoil the looks to much with a big offset.


I'm having a hard time sourcing all parts (quality stuff for a reasonable price) for the rear brakes and was thinking of converting to discs instead.


Top
 Profile  
 
PostPosted: Sun Oct 11, 2015 12:31 pm 
Offline
User avatar

Joined: Sat Aug 08, 2009 1:12 pm
Posts: 233
Location: Belgrade, Serbia
Anyone? :)


Top
 Profile  
 
PostPosted: Sun Oct 11, 2015 12:54 pm 
Offline

Joined: Fri May 23, 2003 11:04 pm
Posts: 22291
Location: County Durham.
I haven't done the st conversion, but from looking into rear disc conversions a few years back I think pretty much all conversions pull the wheels out of the arch slightly.
The fiesta centre kit certainly does.
If you do a search, you may find my post asking for info. It was a few years back now.

Part of the problem is you can't just cut the axle shorter to bring the dsic face inline with the drum fave position due to the rear suspension positioning.
Moving that inwards causes a whole load of new issues and problems.

The fiesta centre kit makes the axle wider by the width of the two disc mating faces.
So about 20mm at a guess. I may be able to confirm this next week.

Jason.


Top
 Profile  
 
PostPosted: Fri Mar 24, 2017 2:17 pm 
Offline
User avatar

Joined: Tue Jan 17, 2006 10:09 pm
Posts: 4764
Ok so I have bought some focus Mk1 98-04 rear stub axles with Disc brakes
With the intention of making up mounting plates that locate onto a machined insert to insure its square to the plug, then I will cut the current drum brakes off the end of my axle, measure the internal diameter of the tube and machine the steel insert to have a tight fit into the tube
This will all be welded up and plug welded.


Image

Image


Top
 Profile  
 
PostPosted: Sat Mar 25, 2017 9:00 am 
Offline

Joined: Thu Dec 20, 2007 5:38 pm
Posts: 52
Location: fife
Wil be doing this myself mate but to my escort van.


Top
 Profile  
 
PostPosted: Mon Mar 27, 2017 12:56 pm 
Offline

Joined: Wed May 18, 2011 6:11 pm
Posts: 2967
Location: S.E Kent
the inside diameter of the beam should be 53mm for any pre planning you may want to do before you chop one up

_________________
When you have a car that fast, a license isn't needed

ATW Motorsport

Follow my racing!
https://www.facebook.com/ATWMotorsport/
https://www.instagram.com/ATW_Motorsport/


Top
 Profile  
 
PostPosted: Mon Mar 27, 2017 3:13 pm 
Offline
User avatar

Joined: Tue Jan 17, 2006 10:09 pm
Posts: 4764
thanks for the heads up.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 17 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: Google [Bot] and 54 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  


Powered by phpBB® Forum Software © phpBB Group