328isport

iTrader: (6)

Hi guys,

I'm interested to know what options there are for us, the small minority determined to stick with 16s, in terms of big brake kits;

These are what I'm aware of so far;

K-Sport 286 or 304mm 6 pot kit - around £850

Custom Godspeed kit using Brembo GT calipers as found on the Leon Cupra R (assuming they still do this) cost??

AP 304mm 4 pot kit - around £2000!

Does anyone know of any other options i've missed? Is anyone on here actually running any of the above kits? as would love to hear some feedback.

The only experience I have so far is on the Brembo GT option, albeit on another car, I had these exact calipers on 305mm discs behind 16s on a hot hatch a few years back, and only have positive comments, they were stunning on the road and on trackdays as well.

Finally Godspeed if your reading this, can you advise if you could do something with the standard 4 pots but on a 304ish mm disc? As I understand the Subaru calipers are actually not bad but are hobbled by to small a disc.

2pot

iTrader: (3)

38mm pistons on oem 4pots - not bad at all. Fit stainless pistons, some pads that suit you and maybe some two-piece discs to dissipate the heat, brake stopper, good fluid etc, with 2pot oem rears.

Disc diameter, and an alternative caliper, under 16's, is going to be wheel design dependent. 300 -310mm?

https://www.scoobynet.com/scoobynet-...n-impreza.html

328isport

iTrader: (6)

Thanks for the info! Do brake stoppers offer a real benefit? I've seen mixed reviews.

Also from that other post I understand you had Godspeed carry out a custom build for you to go behind 16's using Porsche 911/Boxster S calipers? Can you offer some feedback on this set up and also advise me a rough cost for the fabrication side? It seems the Porsche calipers go for £2-300, decent pads £150ish, so I'm assuming once you have custom brackets and discs made it's going to be £8-900 all up - roughly the same as the Ksport option

cuprajake

iTrader: (11)

Brian at cams had some brembo calipers and two piece discs in. They were about 250-300. Iirc

2pot

iTrader: (3)

I found the original brakes on or off, the brake stopper, surprisingly, made the peddle feel more graduated.

I wanted a monoblock caliper with a smaller leading piston (Porsche 36mm/40mm), that would match with the master cylinder and two pot rears - and it would fit under 16" wheels.
The Porsche caliper also meant I could run a thicker disc.

Ring Ian at Godspeed for pricing.

Why don't rally cars use d2 and ksports calipers?

328isport

iTrader: (6)

Hi Jake, Whos Brian at Cams? Guessing this was some time ago?

2pot, OK thanks, what are the advantages of a monoblock caliper and a smaller leading piston? The Porsche calipers certainly seem a good choice, do you know how the caliper design/pad size compare to the Brembo GT calipers as found on the LCR? Superior or very similar?

Regarding Ksport, I'm not their biggest fan tbh, and remember being told they don't have dust seals (believe some models do now), as far as I know D2 and Ksports are very similar, with Ksport more track biased. Either way I'd rather have Brembos, but then I'm sure Ksports would be perfectly fine and be capable of eveything I need, so they's still be considered if the Brembo option worked out too costly...

When looking at calipers from other manufacturers, what will be the limiting factor? is there a tipping point is disc size from the donor car where it becomes impossible to run a caliper on a disc of around 304mm? eg. We know Brembos from the LCR work on a 304mm disc even though they are designed for 323mm discs, I assume the common gold brembo impreza calipers have to big a pad surface area to be scaled down to fit a 300ish mm disc size?

2pot

iTrader: (3)

Impreza front Brembo's don't fit under 16's - at least, none I've ever seen.
You'd need a massive bow on the wheel spokes to clear them, primarily due to their width, not the disc diameter.

Also the Impreza Brembo's have integral mounts, where as radial calipers (Porsche, Brembo GT junior) can have their position changed by virtue of changing the custom mounting bracket.
If the desired caliper has too large a pad for the selected disc, you cut down the pad.

Brembo GT junior calipers are two-piece, as opposed to monoblock - both use 36/40mm pistons.

HTH

328isport

iTrader: (6)

Great thanks 2pot, it sounds like the Porsche calipers are very well suited, and would also allow the use of the standard pads meant for the caliper without any need to modify them.

Do you know the disc diameter the 996 351 425 & 996 351 426 calipers were originally designed for? Also what brake lines do you use with this set up?

2pot

iTrader: (3)

Porsche disc is 318mm x 28mm, and used with 17" wheels. Although the caliper would probably fit up to a 330mm disc.

I don't think you can avoid cutting the pad, on a 16" wheel, with that Porsche caliper. You'd need a massive bow on the 16" wheel spokes, as well as an et48(maybe less).

328isport

iTrader: (6)

Ah OK, is it then that the height of the pad would be too tall for a 304mm disc when mounted correctly and therefore be sitting proud over the top of the disc or touching the disc bell? Surprised they need to be cut as my Brembo GT's were meant to be used with a larger disc than the Porsche units but fitted to 304mm discs from a 406 Coupe I could still use the standard Leon cupra R pads without modification, though granted the pads used the whole face of the disc, not a lip in sight!

2pot what are your thoughts on the Brembo/Porsche 986.351.421 & 986.351.422 calipers as used by the 2.5/2.7 boxsters? I wondering about these as know they were designed to go behind a 16" wheel, using a 298mm disc which is 24mm in width, so I expect they'd work quite well with a 304ish mm disc and decent discs/pads, without any fitment issues.

That said I'm not sure if they would offer much more than a good standard Subaru 4 pot set up..

Just to let you know my wheel set up is 16" Rays TE37 et53 offset with 5mm hubcentric spacers and Yokohama AD08s

joe v3sti

iTrader: (8)

I'll be going for the KSport 304mm kit with decent pads. If it's good enough for Justin's 500bhp sprint car which he's win all sorts in, I'm sure it will be more than up to the job


Joe