Rob

I am pretty sure the offset is 45mm, and the discs thickness is 28mm, but I will measure mine to be certain.

Steve

 

Thanks Steve - I wonder whether this would work on an F hub then? I guess that I'd need to know the internal diameter of the disc's bell as well...

Thickness, I'm thinking, might not be all that critical - especially if one plans to install ZR calipers at the same time (I suspect that the pad area is much larger as OE!)

 

If Steve doesn't get anywhere Rob, then I have a 282mm disk in my garage that has not been fitted yet. Could probably measure it all on Tuesday.

 

That'd be great, thanks Stu

 

I'll get mine all measured for you tomorrow Rob, should hopefully be fitting them as well then.

Steve

 

Cheers Steve - much appreciated!

 

Hmm - just measured up the internal diameter of the standard MGF 240mm rotor's bell: 123mm. Seems an odd measure?

I wonder whether any rotor can be fitted to the hub, so long as ID of the bell is larger than the hub???? Surely better to have an interference fit?

 

ZR160/ZS180 disk is 25mm thick.

 

The ID of the bell is 143mm as near as damn it anyway, so I think there is plenty of clearance here. The centre hole is 65mm, and as Ste says the discs thickness is 25mm.

Steve

 

ob y not go for the set up of the trophy 160 MGF??? basically the same setup but will fit direct.

al

 

Cheers Steve - those measurements give some credence to the idea that I can use these discs on the F Did you manage to confirm the offset of 45mm?

Al, the big problem with the AP set up for me is the fact that you have to use either MGF Trophy or TF160 alloys. They are hansome enough for many to fit them to their cars irrespective of whether they have the AP brakes fitted or not, but they weigh over 60% MORE than the 16" MGF Cup style wheels that I currently use. For track use (and my car does more than its fair share of circuit miles ), the increased unsprung mass is undesirable.

But the 240mm standard brakes are pants, even when using MG Sport and Racing slotted discs and Mintex 1177 pads. The ZR/ZS discs represent a useful 42mm increase in diameter - and should fit under the majority of MGF wheel styles...

Whether this proves to be an economical route, of course, remains to be seen...

 

Hi Rob

Yes the offset is 45mm sorry about not comfirming that.

Steve

 

i use 820 turbo discs on my metro with a small spacer to move the calliper out.

Drew

 

Hi,

how about the Golf G60 discs that have been used on the MG Maestro's and Montego's, 285mm I believe.

HTH

Neil

 

once the holes are redrilled any disc will fit!

you need to look at the calliper position/offset if your using them from another car. or a spacer for your own callipers.

G60 is 280mm, 40mm high, 22mm thick, hub diam 150mm.

Drew

 

Thanks folks

Drew, Neil, yeah, you're both right about disc options Indeed, the VAG disc option developed for the Maestro was an early adoption for many in the F community because the front discs on the MGF and TF (160 excepted) are Maestro/Montego items!

The question of calipers does arise. I could probably reuse my standard calipers, but I'd rather use calipers with larger pad surface area.

The ideal would be to use a four-pot caliper (I may be able to source one of these off the shelf from AP etc), but 4 pot calipers are a good deal more bulky than sliding caliper designs. Therefore, I am wondering whether ZR/ZS calipers will bolt directly onto the MGF (nee Metro) hub without modification? Is the caliper bracket spacing and hole location the same between models? Seeing that the calipers are a generic Lucas Variety design, this seems to be a possibility?

Cheers - and a happy new year to all! :beer:

 

the calliper bolts will be too far apart on a 200 so they wont bolt straight on.

metro, 80mm centres
200 range, 140mm centres

im assuming the mgf has the same as the metro.

Drew

 

Nuts. Thanks Drew - I knew that it couldn't be THAT simple

 

Rob,

what are you after from the conversion? What kind of budget are you looking at? There's probably a 1001* options that could be looked at, and not all of them costing a fortune

Cheers

Neil

* Random number picked for no real reason, actual number of viable options would take some thought :doh:

 

No budget set per se Neil: budget is flexible, and would ultimately depend on effectiveness. For excellent brakes, I would happily pay in excess of 1k - but not everyone else would. So I am wondering what options are out there that are:
1. affordable (ie costing hundreds, not thousands of pounds!)
2. easy to fit (ie wouldn't necessarily require specially made brackets - ideally avoided if possible as OE brakes are presumably 'fit for the purpose' and one has to wonder about parts that are made as a one off - if you know what I mean )

What kind of options were you thinking of?

 

option #8

The front brakes are now cross-drilled and slotted 280mm DBA items, drilled to suit the new stud pattern and gripped by Hawk Blue pads living inside Mitsubishi Magna V6 calipers. The calipers have been re-drilled to match the MGF’s factory mounting points, and the pads make contact with the entire swept area of the discs, providing unbelievable stopping power.

taken from here.



option #555

I wasted a long time to consider the MGF brake system upgrade method. AP, Brembo, ENDLESS, or some other Japanese parts. After all, cost/performance is the first condition. Finally I chosed Impreza genuine 4 pot caliper for that. IMO: It would be the best if the disc diameter could be 305 to 310mm front and 300 rear for MG/Rover 16 inch round 6 spoke rims. Please no ask, there is no plan to make commercial parts.

taken from here.


or option #200

all you would need to fit the 200 style calliper to the mgf is a bracket something like that ^^^ and a disc with the right depth/diam.

Drew

 

Thanks Drew I'm familiar with Don Liang's excellent Scooby disc/caliper conversion. Indeed you're right, this could be an excellent avenue to follow - either using R200 calipers or indeed Scooby (or similar) four-pot calipers.

Funnily enough, I'd read the MGW report on that Turbo MGF, but must have completely missed that mention on discs/calipers - so many thanks for bringing my attention back to this.

I've also been chatting to a friend in Australia who races MGFs, who is currently looking into 'affordable' brake upgrades - in this case using off the shelf discs (he's tried and rejected already MINI Cooper S rotors) and Mazda RX7 (IIRC) four pot calipers. Looks as though, in order to get clearence between caliper and wheel he'll have to go for a disc with a larger offset than the 44/45mm of the MG discs...

So basically there is almost too much choice - if there is such a thing. With a suitable bracket, you could use almost any caliper (although with brackets you do need to be careful that they are made correctly, as brakes are a critical safety item - there you go, there's the obvious statement of the month!!! :lol: ). Moreover, it looks as though you could use almost any disc too.

Keeping the discs inside the "MG family" would help keep costs down, and spare part availability high - it's just a shame about the caliper mounting being so different Any other car with a caliper mounting using a 80mm hole centre spacing?

 

Rob,

Have you tried hispec, no experience with them apart from discussing a B rear conversion.

http://www.hispecmotorsport.co.uk/index.htm

Paul

 

I've not tried these personally Paul, but a friend of mine, Paul Nothard, has them on his F. They seem to work extremely well, although the pads did seem to suffer from excessive 'wedge' wear - we're not sure why this has occurred (design issue, or driving conditions question?) I had similar problems, incidently, with my standard pads having visited the same tracks as him at around the same time... [cue twlight zone music!]

Also, it seems to be excessively difficult to get hold of the guys at HiSpec, which doesn't give one the greatest confidence. How have you found communicating with them Paul?

Finally - although front and rear conversion kits are listed/planned, none have so far appeared. As the F's weight distribution is 55% rear, the rear discs do more work than in a front engined vehicle - so neglecting the rear brakes is a mistake IMO. Hence the idea of using ZR discs front and rear, as both are larger than the weedy 240mm discs used on the F front and rear...

 

Rob,

I wouldn't worry too much about aftermarket brackets being fit for purpose, they are usually way over engineered. All you have to do is made sure they are made of a decent grade material, usually they are made out of Aluminium, I'd go for HE30 with a minimum thickness at any point of 12mm (including thickness from edge of holes to outer edge). You also need to make sure that all the fastners that you use in the conversion are up to the job, i.e. nuts, bolts, etc.

The main things to think of though are what application you want to use them for and how much abuse they get, i.e a bit of trackday action, fast road driving or all out competition driving.

You need to work out exactly how much space you have to play with, not forgetting the inside of the disc/caliper catching on suspension components, etc., that will give you the maximum diameter and thickness of a disc and caliper combination for a certain wheel and you can start to decide on specifications from there.

The wedge effect or taper on the pads is due to the leading edge of the pad biting more than the trailing edge, one of the most effective solutions around this when using a multipot caliper (4, 6 8 pot, etc.) is to use a smaller piston towards the leading edge and a larger piston at the rear, therefore giving more clamping force to the rear of the pad and evening out pad wear.

HTH

Cheers

Neil