Rear caliper installs?

[mhuk]

Hi,

I already have a Canley classics front big brake kit and now I'm looking at the rears. Does anyone sell a kit or the plans to DIY?
I see TimW has MGTF rear calipers installed but it's not a plan/too much info (His not required to share anything) it's enough to know what is needed but not enough ideally for me to work with.

Any input regarding what is needed/who sells/mods ect would be helpful. My car is 73 Spitfire with swing spring.

Thanks

MArtin

[Clive]

The conversion was done originally by Hugh Glossop(think that is spelt correctly) and detailed in the TSSC magazine several years ago.

I have done it to a rotoflex car.

For you it would mean a pair of MGF discs, some calipers (try polo ones, they are much lighter than the MGF ones as they are alloy) and some sort of bracket to attach them. Hugh used a modded escort mk2 bracket, but it should be easy enough to make one out of 5mm plate. approx.

However, what is your reasoning? I am questioning if I have done the right thing. Rear drums work very well. Discs will need a proportioning setup of some description. As well as being heavier.

[mhuk]

Hi Clive,

Thanks for the speedy reply.

Are you saying Polo (year?) are lighter and a fit for the MGF discs? 5mm plate sounds idea.
I would have a pro weld that up for me. I could tack it though.

Does anyone have a scan of the magazine or is it possible to buy?

I have a Spitfire with 200bhp or so.. I builds up speedy rather quickly and I would like discs all round to stop it. The front standards simple are not man enough but those are not 4 pots and the rears ideally need an upgrade. Plus I like to tinker with things.

Regards

Martin

[Deleted User]

I am going the MGF TF rear conversion, I have the calipers, they accept a handbrake and are cheap. Heavy? still lighter than a drum rear end, and being MGF you can use the correct disc and fabricate a bracket. Tim (bestquality03) did this to great results , especially with the Canley front conversion.

Rob

[junkuser]

An advantage of having discs all 'round is having matching fade characteristics front and back, which could well be an advantage on a "Spitfire with 200bhp or so". (Rather sounds as though it may not be driven too gently)

[Clive]

A diff conversion may be on the cards with 200bhp......
Then it should be part of teh package.

I believe the polo (and probably golf) calipers were /are a common fitment, used on lots of kitcars.
the bracket was a flat plate I think, so no welding.

And yes, I still think the discs/callipers/brackets weigh more than a drum and

backplate. Add a rotoflex upright and the difference is substantial.....

Maybe I should weigh them all, but then again I do not have any drums/backplates. Can certainly weigh a polo calliper v an MGF version. Not tomorrow, Thursday doubtful. Friday looking a good chance....

[byakk0]

Here is one, although I have no experience with it.

http://prirace.com/page/triumph-gt6-rear-disk-brake-ki

[mhuk]

bobyspit wrote:

I am going the MGF TF rear conversion, I have the calipers, they accept a handbrake and are cheap. Heavy? still lighter than a drum rear end, and being MGF you can use the correct disc and fabricate a bracket. Tim (bestquality03) did this to great results , especially with the Canley front conversion.

Rob

Rob,

How far along are you?

Any pictures? I see the discs and calipers  are very cheap to buy so it's worth a punt.

[mhuk]

junkuser wrote:

An advantage of having discs all 'round is having matching fade characteristics front and back, which could well be an advantage on a "Spitfire with 200bhp or so". (Rather sounds as though it may not be driven too gently)

It was supercharged before but now turbo. I got fed up with the lack of SC power so took it off the road for a year and now I'm setting up for the turbo.

[mhuk]

cliftyhanger wrote:

A diff conversion may be on the cards with 200bhp......
Then it should be part of teh package.

I believe the polo (and probably golf) calipers were /are a common fitment, used on lots of kitcars.
the bracket was a flat plate I think, so no welding.

And yes, I still think the discs/callipers/brackets weigh more than a drum and

backplate. Add a rotoflex upright and the difference is substantial.....

Maybe I should weigh them all, but then again I do not have any drums/backplates. Can certainly weigh a polo calliper v an MGF version. Not tomorrow, Thursday doubtful. Friday looking a good chance....

I will google the polo/golf idea.

[mhuk]

7952 wrote:

Here is one, although I have no experience with it.

http://prirace.com/page/triumph-gt6-rear-disk-brake-ki

Ouch. Makes the front kit look very cheap. Thanks for the input.. It does indeed provide some help as to how it all works.

[mhuk]

Spitfire used to a 1500 with TH12 cam / lightend flywheel and went well but sadly the engine started to have issues.

Then it got a mazda engine SC.



Now it's turbo



You can follow it on Facebook if you have an account > http://www.facebook.com/TSMod

[Slimboyfat]

6858 wrote:

Ouch. Makes the front kit look very cheap.

Double ouch! Time to put our prices up me thinks.

[GT6 M]

MGF rear calipers, not that good really,  also catch the spring tunnel wid the cable.
Saxo VTS calipers, modded  are ok for foot brake, but run same prob as MGF, they catch the tunnel

SX200 calipers,  v slightly modded work great
HB is also so so much better, an ne catch,n the tunnel with the cable.

What ever set up ye bung on, it will need a .7 or .75 MC
also will require a RPV to keep lines charged, 2 PSI is all thats needed
as the rear calipers have alott bigger cyls than the HB ,ns
so pedal moves further, to floor, with nee mods  !!!

there deffo ne need for a bias valve at all, well GT anyhoo,
some serious braking going on back here, an ne rear end slide on footy brake application
and thats with 280 MM rear discs an 305 fronts with 4 pots

there 2 diff articles I did on 2 diff types of rear disc set up
the SX200 is far superior in all departments to any thing else
HB is so so powerfull with oot actually pulling on the footy brake, like all others will doo.

as usual, cant fin the articles on search, so mebe some  folk adept at the search fnctionee can fin em

reason I went to rears was to stop brake snatch at high speeds on sweeping bends,
esp when suspension travel can actually bung yer rears on with oot yer say so.
M

[mhuk]

796 wrote:

MGF rear calipers, not that good really,  also catch the spring tunnel wid the cable.
Saxo VTS calipers, modded  are ok for foot brake, but run same prob as MGF, they catch the tunnel

SX200 calipers,  v slightly modded work great
HB is also so so much better, an ne catch,n the tunnel with the cable.

What ever set up ye bung on, it will need a .7 or .75 MC
also will require a RPV to keep lines charged, 2 PSI is all thats needed
as the rear calipers have alott bigger cyls than the HB ,ns
so pedal moves further, to floor, with nee mods  !!!

there deffo ne need for a bias valve at all, well GT anyhoo,
some serious braking going on back here, an ne rear end slide on footy brake application
and thats with 280 MM rear discs an 305 fronts with 4 pots

there 2 diff articles I did on 2 diff types of rear disc set up
the SX200 is far superior in all departments to any thing else
HB is so so powerfull with oot actually pulling on the footy brake, like all others will doo.

as usual, cant fin the articles on search, so mebe some  folk adept at the search fnctionee can fin em

reason I went to rears was to stop brake snatch at high speeds on sweeping bends,
esp when suspension travel can actually bung yer rears on with oot yer say so.
M

Are we talking Nissan 200SX caliper?

I already own a Wilwood RPV that's sat around doing nothing. Slight modding? Thanks for the post :-)

[GT6 M]

Are we talking Nissan 200SX caliper?

yes, but the ..akebono type..

slight modding entails cut,n the OE HB lever stub off
so as OE GT cable can fit on to HB arm

M

[JohnD]

SofS has MGF rear uprights and discs.   You quite right that the hand brake cable fouls the outer end of the spring tunnel, but it's only that outer end.   Cutting off the corner and welding a new plate in place, solved that, and although I was ready to fit a bias valve, it has proved unnecessary.   Maybe the length and weight of the Vitesse is the difference.

See here.  Looking back in the right hand wheel arch, along the radius arm.   Yuu can see the new plate, with the roll cage foot bolts.;  the cutout is beyond that out of shot.   That chain isn't the hand brake cable but a dummy I made from bath plug chain to estimate the correct (new) length for the cable, and to work out where to cut the corner.  That key-holed piece of scrap alloy is how I set the experimental length.
John

[ferny]

I hope it's ok to thread hijack a little as I was going to read through your RR thread again soon.

I've been contemplating which way to go - turbo or supercharger. I had planned to go the turbo route but... my car happily lights up the rears in 2nd gear in even the slightly moisture. I had a problem where I lost the back end in a straight line in 3rd gear when overtaking on a dual carriageway which I put down to an oily road or standing water. I bit of experimenting says it wasn't! At around 3500rpm my 1.6 lump has a very noticeable kick in power and that made me back away from the turbo and start looking into superchargers. How does the power delivery compare? I'm only aiming for around the 200bhp mark at the flywheel so nothing major, but I don't really want to add to the kick I'm already getting. I was also wondering how much room there would be as the supercharger looks like it comes over a long way and I'm already tight for space with the inner wheel arches.


This is all on the back burner for now though. Megasquirt by Easter instead of this month, maybe.  :-/

[cook1e]

Not brilliant pictures but this is the set up on Colin Geers Cossie Turbo GT6. It has modified GT6 uprights with MGF discs and calipers. Also has CV joint suspension with Coilover shock dampers and top and bottom wishbones instead of the original transverse spring. Not relevant to this post I guess but the diff is a Sierra Cossie LSD. The set up uses 15 inch wheels to provide clearance to the brakes at the front which are AP racing Clipers with bigger discs. Looks to be plenty of clearance at on the back set up though.