Rear brake upgrade 300mm

[stesrg]

Well thought this was good idea until I saw the cost ! Surely it would not cost that ?
Ok who has one or should I say who would be in the market for one of I found out what break discs the were I could make the whole kit on my CNC machine :-)
Look
http://www.ebay.co.uk/itm/like/251073885730

Ste.

[Hoover.]

anything to do with brakes aint cheap..... about to pay £1k on my jeep GC which is worth less then £1k..... wheels and tyres cost more then I bought it for

[Pete Mac]

stesrg said:

..... who would be in the market for one of I found out what break discs the were I could make the whole kit on my CNC machine :-)
Look
http://www.ebay.co.uk/itm/like/251073885730

Ste.

Steve, yup I might be potentially.

I'm not sure right now what to do with my brakes on my rebuild. Whether to:

• leave them standard but put on new discs, rebuilt calipers etc.
• Put on larger, grooved discs as here and rebuild the calipers
• or whether to put 4 pot calipers all round.

I suspect the last option will be just too expensive but they look great.

What have you got in mind? A CNC machine, that has a lot of potential. Let me think, I could give you a long list of things that could be turned out on one of those..... Pete

[stesrg]

Pete Mac said:

Steve, yup I might be potentially.

I'm not sure right now what to do with my brakes on my rebuild. Whether to:

• leave them standard but put on new discs, rebuilt calipers etc.
• Put on larger, grooved discs as here and rebuild the calipers
• or whether to put 4 pot calipers all round.

I suspect the last option will be just too expensive but they look great.

What have you got in mind? A CNC machine, that has a lot of potential. Let me think, I could give you a long list of things that could be turned out on one of those..... Pete

Hi , looking at the ones on ebay looks like a single 300mm disc a steel circle cut out and drilled to fit the griffs hub bolts and a few spacer plates for the caliper ?

would not take much to cut and machine that out as a kit ???

Ste

[QBee]

IMHO you don't need bigger disks. Just better disks (grooved) and better pads.

[portzi]

QBee said:

IMHO you don't need bigger disks. Just better disks (grooved) and better pads.

I'm no expert on brakes but an upgrade from standard 2 pot caliper with good pads and discs to an 4 pot AP caliper or a cheaper copy, should make a massive different with braking especially on track days?

[K4TRV]

QBee said:

IMHO you don't need bigger disks. Just better disks (grooved) and better pads.

^^+1^^

The Griff/Chim's are 1060 Kgs and pretty-well balanced in braking terms.

You may need something approaching 283/300mm at the front, but nothing more than 270 for the rear AIMVHO!!

Unless it's just for purely cosmetic reasons? Then you-pays-your-money and do what you want, clearly ignoring the driving dynamics? Again AIMVHO

T

[MPoxon]

IMO the standard system is more than adequate for road use, especially if upgraded with DOT5.1 fluid, braided hoses and your personal choice of brake pad (in my case Ferrodo DS2500s)

Track days are where bigger brakes really make a difference as the standard system overheats very quickly when you hammer them. I chose the Alcon 295mm kit with 4 pot caplipers for mine and the difference is night an day. I remember the first track day I tested them out, I was able to confidently accelerate up to 140 on back straight at Bedford GT (nice long straight) safe in the knowledge that the new brakes would be able to shake off most of that before the chicane. There is no way I would have trusted the OEM system to do that.

[Pete Mac]

[quote=MPoxon]IMO the standard system is more than adequate for road use, especially if upgraded with DOT5.1 fluid, braided hoses and your personal choice of brake pad (in my case Ferrodo DS2500s)
quote]

I think that's my answer. A complete rebuild, including new pistons if necessary, is probably what I will do. I can always put on 4 pots later if necessary. The brakes on my 'Green Meanie' are quite adequate for normal, road use but they have been upgraded with new pads and 'Green Stuff' pads by former owner. I know, much debate about pros and cons but I've never had a problem and they have good feel and bite but there again none of us have much to compare them against.....

Still interested in this kit though, depending on price etc. Pete

[QBee]

MPoxon said:

IMO the standard system is more than adequate for road use, especially if upgraded with DOT5.1 fluid, braided hoses and your personal choice of brake pad (in my case Ferrodo DS2500s)

Track days are where bigger brakes really make a difference as the standard system overheats very quickly when you hammer them. I chose the Alcon 295mm kit with 4 pot caplipers for mine and the difference is night an day. I remember the first track day I tested them out, I was able to confidently accelerate up to 140 on back straight at Bedford GT (nice long straight) safe in the knowledge that the new brakes would be able to shake off most of that before the chicane. There is no way I would have trusted the OEM system to do that.

Were the Alcons fitted on all four, or just the fronts?

Like Matt, I went for better brakes for track days, starting with the fronts, where most of the braking effort is made. Dot 5.1 fluid (to avoid boiling te fluid) upgrade to 324mm Black Diamond ventilated 12 groove disks (Focus RS), and 4pot calipers with racing pads (to give better braking and avoid fade from repeated hard braking).

At the rear I simply upgraded the pads at first to Ferodo DS 2500, eventually upgrading the disks to still standard size (273mm) Black Diamond ventilated 12 groove disks. Car feels balanced under heavy braking on track and road.

[jeboa]

Could you use the rotors from here?

http://www.hispecmotorsport.co.uk/page483.html

I thought the standard discs were 24mm - guess it doesn't make much difference?

[QBee]

Just a quick PS - I run 17 inch wheels all around to accommodate the bigger front brakes. I might get away with some designs of 16 inch front wheels, but I have never tried it. The logic of all this is that bigger wheels mean you can have lower profile tyres while keeping the rolling diameter approximately the same as standard. Stiffer dampers as well, and I have a nice stiff set up for track. Of course, with adjustable dampers one can soften the ride off for the road. Tyre load index will also affect ride comfort.

[SILICONEKID345HP]

K4TRV said:

^^+1^^

The Griff/Chim's are 1060 Kgs and pretty-well balanced in braking terms.

You may need something approaching 283/300mm at the front, but nothing more than 270 for the rear AIMVHO!!

Unless it's just for purely cosmetic reasons? Then you-pays-your-money and do what you want, clearly ignoring the driving dynamics? Again AIMVHO

T

Are there any four pot calipers available to fit on the standard later Griff/Chimaera discs .

[WinstonWolf]

I've got the Compbrake version of that kit, balances the 300mm 4 pot setup I have on the front.

[SILICONEKID345HP]

WinstonWolf said:

I've got the Compbrake version of that kit, balances the 300mm 4 pot setup I have on the front.

I made a balls up and bought the Hi spec 283 kit ,should of fitted the 300mm kit ,it now means i can`t upgrade the rears .

Edited by SILICONEKID345HP on Saturday 24th January 12:40

[WinstonWolf]

I did a *lot* of maths before I did it, the thread is on here somewhere

[MPoxon]

QBee said:

Were the Alcons fitted on all four, or just the fronts?

Like Matt, I went for better brakes for track days, starting with the fronts, where most of the braking effort is made. Dot 5.1 fluid (to avoid boiling te fluid) upgrade to 324mm Black Diamond ventilated 12 groove disks (Focus RS), and 4pot calipers with racing pads (to give better braking and avoid fade from repeated hard braking).

At the rear I simply upgraded the pads at first to Ferodo DS 2500, eventually upgrading the disks to still standard size (273mm) Black Diamond ventilated 12 groove disks. Car feels balanced under heavy braking on track and road.

Just the front Anthony. Good idea on uprating the rears to 273. What is the deal with the 273mm brakes for the rear, the appear to be a standard TVR part but I am sure my rear brakes are 240mm and mine is the 500 so should be the latest brake offering.

http://www.racetechdirect.co.uk/j0136a-tvr-car-par...

[Barreti]

I've done some digging recently on the EBC websites and they all quote TVR Griffith as 273mm rears for the 5.0ltr cars and 253mm diameter for the 4.0 and 4.3 cars.
They do quote different 'height' for front rotors with the same diameter for 5.0ltr cars so clearly things are not so cut-and-dried as the 5.0 / 4.x split may appear.

Edited by Barreti on Friday 23 January 12:51

[QBee]

MPoxon said:

Just the front Anthony. Good idea on uprating the rears to 273. What is the deal with the 273mm brakes for the rear, the appear to be a standard TVR part but I am sure my rear brakes are 240mm and mine is the 500 so should be the latest brake offering.

http://www.racetechdirect.co.uk/j0136a-tvr-car-par...

My 1999, ahem, Chimaera, came with 260mm fronts and 273mm rear brakes. I always thought your car was a later Grief?
Why not just measure them tomorrow?

I did the rear upgrade last of all. I was perfectly happy with the standard disks with DS2500 pads for track days. I only upgraded when Mat said my disks and pads were worn out, and it seemed silly at that point not to go for the same make of grooved disks that I absolutely love on the front.

Next time we hit the track together, please take my car for a drive and you will feel for yourself how much difference both the disks and Tyres make.