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View Full Version : 256 vs 284 vs 308mm brakes.


MattBrown
23-08-10, 07:39 PM
Right, basically, I have a set of 256 brakes, with black diamond drilled and grooved disks, and mintex pads.

I have a set off 284 turbo callipers, that I have shotblasted, resealed, and put new pads in. With 284 fiat disks.

Is there any advantage me getting the lmf conversion, to make a set of 288 v6 brakes, into 308?

Is a bigger disk better? As the way I see it, more heat can be dissapated, and there is a bigger leaver from a bigger disk:confused:

Will my 284's cope ok on track?
MattBrown
23-08-10, 10:34 PM
Surely someone understands brakes? :(
Rich
23-08-10, 10:44 PM
just fit a full 308mm kit?

308 is going to be better but do you really need it. How about 4pots?
craig green
23-08-10, 10:45 PM
Imo you can overbrake a car/Nova. Also you need to consider that the m/c is designed to supply fluid output for smaller slave cylinders (calipers) than even the 16v setup. So go too big & a spongy pedal is the result.
The Calibra turbo/early Cav V6 is a good compromise.

I've run 288 Vec V6's & got on OK with them with a std Nova's 20mm m/c. Vauxhall use 22 & 22.2 bore m/c's on 16v cav & Vectra etc.
MattBrown
23-08-10, 10:48 PM
just fit a full 308mm kit?

308 is going to be better but do you really need it. How about 4pots?

What 308mm fits?

I know that anything new (mk4 astra or newer) dont fit etc:confused:
simonm
23-08-10, 10:48 PM
308s will be too big on a nova to be good they will lock up under hard braking as there isnt enough weight its not always bigger brakes are better its all to do with weigtht and velocity and wheel size and tyre choice would be better sticking with 288
craig green
23-08-10, 11:07 PM
308 would limit you to 16's?
288's stop damn well tbh. Atleast you can run 15's.

When I had mine with 288's & rear discs & got in numerous modern cars & found the brakes lacking. Its not ofeten you can say that about a nova. With good pads & high performance fluid that should be awesome.
Jack
23-08-10, 11:08 PM
And don't forget bigger brakes = greater unsprung mass which will affect handling. That is unless you spend big dollar on a lightweight setup.
MattBrown
23-08-10, 11:19 PM
So, to condense.

I should leave the 256 on the shelf.

And run the refurbed set of 284 turbo brakes, with a gsi servo?
craig green
23-08-10, 11:20 PM
Servo makes barely no difference.

yeah run the 284's IMO.
MattBrown
23-08-10, 11:21 PM
Servo makes barely no difference.

yeah run the 284's IMO.

Would I notice a differance going for rayland brakes in the future?
GDN16v
24-08-10, 08:37 AM
Would I notice a differance going for rayland brakes in the future?

I had the Reyland set up on my cav and they made a massive differance over the standard 284mm calibra turbo set up! Although i get the same braking performance from my 288mm Wilwoods 4 pot set up and it is alot lighter for less money aswell!;)
Will F
24-08-10, 08:50 AM
There are some really ropey responses in this thread - but I wont go into that....

Go for the 284s - as long as you get good pads - they wont fade - we used them on Kris's (Corsakid) at Brands with green stuff pads and they lasted all day - 20 laps at once!
Stuart
24-08-10, 09:55 AM
Have a read of the braking article ;)

Dans track car is running 256mm "valver" stuff with some good pads and they worked really well on the old setup (new car seems to have gash brakes but thats down to the rear discs).

My vx (same weight as the nova essentially) has 288mm discs all round and stops epicly well, as do the elises with the same size discs. I tried 308mm discs and noticed sweet feck all difference in braking performance.

In short, cheap plain vented discs + good pads (such as Mintex 1144/1155's) and decent brake fluid (Even just new dot 5.1 every trackday) will sort you out..........
Adam
24-08-10, 08:35 PM
284s ive found to be best.
I faded 256s on track, and 308s are a bit overkill on a nova.
mk1nova_rich
24-08-10, 09:04 PM
Imo you can overbrake a car/Nova. Also you need to consider that the m/c is designed to supply fluid output for smaller slave cylinders (calipers) than even the 16v setup. So go too big & a spongy pedal is the result.
The Calibra turbo/early Cav V6 is a good compromise.

I've run 288 Vec V6's & got on OK with them with a std Nova's 20mm m/c. Vauxhall use 22 & 22.2 bore m/c's on 16v cav & Vectra etc.

sorry to hijack but can the larger bore MCs from the above cars be fitted to a Corsa B servo??
Benn
24-08-10, 09:29 PM
When i ran 256 was the last time i was happy with the brake feel and pedal feel (till i fitted 4pots)

284 where ok, 288s felt worse, so i went back to 284s.

308 shouldn't feel any different to 288 cause its the same capilar just spaced out more.

Tbh try 256mm with a proper set up. If you dont like then move up.
MattBrown
24-08-10, 09:33 PM
Think ill get my redstuff pads ordered for the 284 setup.

I had 256mm on my 1.0, and they were good, but mintex pads took abit to get going.
Benn
24-08-10, 09:35 PM
Proper pads take a lil time to get warm, but they get warm and stop well. That's the point.

I thought Redstuff pads where the Halfords spec line of pads tbh. My mates ones broken up and cracked on a std Astra GTE on track.

Have you ever driven on track?
Stuart
24-08-10, 09:40 PM
EBC suck balls... they are in the gypo end of the camp lol