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MG MGF Technical - Trophy Discs

What is the thickness when new and the min thickness for the 305mm dia discs?
Steve Ratledge

Hi Steve,

According to my notes of a conversation with AP a while ago, 26.2mm new and they suggest buying new ones when they wear to 25mm. I've had a pair last over 40k and a few track days, didn't measure them but they were still stopping the car with awesome ease...
Mike Hankin

Steve, I suspect that you have an ulterior motive for asking that question: spill the beans! :o)
Rob Bell

I could do with a bit of clarification.

1) Is there any difference between the Trophy callipers and the ones fitted to the TF?

2) Where is the current best (cheapest) place to get new 305mm discs?

3)Has any body upgraded from 240mm discs with Mintex 1177 to the 305mm discs - was it worth it?

Cheers in advance
Steve
Steve Ratledge

Steve
1. No
2. EBC are now doing discs
3. I have a Trophy so already have the bigger discs and calipers but the better braking performance comes from using both components.
Blue Pocket Rocket

Completely agree with BPRs comments. I'd add:

>> 1) Is there any difference between the Trophy callipers and the ones fitted to the TF? <<

They're exactly the same. Only the very last of the 2005 TF160s used the two-pot AP caliper in place of the earlier 4-pot. Fortunately, you are unlikely to be offered a set of these :o)

>> 2) Where is the current best (cheapest) place to get new 305mm discs? <<

Mike had been looking into this, but persuading an after market manufacturer to come up with the parts proved very difficult. EBC have entered the market now - plus I would think that you could get similarly specified alloy-bell rotors from AP themselves (will help reduce unsprung weight ;o) )

>> 3)Has any body upgraded from 240mm discs with Mintex 1177 to the 305mm discs - was it worth it? <<

I don't think anyone has yet done this. But I've compared my car at Castle Combe with Tim's - mine has the 1177s all round, and Tim has the AP front set up with standard pads all round. IMO his car is over-braked at the front, leading to easy lock up. The Trophy 160s I drove had the same problem. Dave Livingstone has recently upgraded his rear pads to 1177s, and reports a far better braking balance, while using standard AP front pads. Probably the way to go until we can find a suitable large-rotor rear set up.

I am considering this route - especially once the new engine is built up! :o)
Rob Bell

>>They're exactly the same. Only the very last of the 2005 TF160s used the two-pot AP caliper in place of the earlier 4-pot. Fortunately, you are unlikely to be offered a set of these :o)

Rob, that was what the sale blurb said, but in practice I don't think it ever happened. My 2005 car still came with 4 pots :D
Steve White

I reckon that MG were working through their old new stock 4-pot calipers before converting over to the cheaper 2-pots. Which is good news for you Steve!

I wonder if any two-pot AP caliper equipped cars escaped the factory before Black Friday?
Rob Bell

Any idea of the cost of the EBC discs?/who is doing them?
Steve Ratledge

They are £150 for the pair, which works out at almost exactly half the price of the standard MGR ones!

http://www.brakes4u.co.uk/proddetail.asp?prod=GD1176&cat=12267

They say they are 'drilled', but if they are like the other EBC TurboGroove discs, they are actually 'spotted' or 'dimpled', ie not drilled all the way through.

Ian Matheson

Just noticed that brakes4u.co.uk are also doing a 10% discount on these discs, plus free shipping on orders over £50, so total cost for 2 discs delivered to your door is £135.36.



Ian Matheson

Pretty good - well spotted Ian. I'm going to have to bite the bullet on new 304mm discs soon and these look tempting. I wonder if they suffer from the same noise issue that the smaller EBC discs seem to (due to the dimples I believe). Anyone tried them yet?
Dave Livingstone

OK what about the price of normal Rover (or Mintex) pads for the Trophy/TF calipers?
Steve Ratledge

For Mintex pads, when I was looking into it, I was quoted £85.82 for the AP caliper. That may have been for the 1177 material, which, to be honest, I am not sure that I would recommend.

1144s are probably better - B&G and Mike Satur I think have these in stock for this 'ball park' figure.
Rob Bell

Interesting notes from you,Rob ! I guess the reason for not recommending the 1177 is that the pads are still alive and fine but the discs are razor thin ;O)?
Found similare on other car that was used in club/track events.
I would gladly settle for a maximum 40/60 wear,or more pad-biased wear, but still have to find the mix of pads (and discs,as they DO differ in material and wear-rate).

Any suggestions on what to use for a more even distrubution of pad/disc wear ? / Carl.
Carl

Carl, I am a big fan of 1177 pads, as you probably know - and am okay with the disc wear rates. But for a 304mm disc with the AP 4-pot caliper? M1177s would be far too much braking relative to the standard-size 240mm rear brakes with the sliding caliper - the AP-equipped cars are over-braked at the front as it is. Fitting M1177s would simply exacerbate this to the extent that braking efficiency would drop...

As explained in this article: http://www.mgf.ultimatemg.com/group2/brakes/big_brakes/Big_Brakes.htm
Rob Bell

This thread was discussed between 27/07/2005 and 06/08/2005

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