Rear OUTBOARD Brake Conversion;

junglejustice · #1 (**permalink**) 10-07-2004, 09:15 AM

I'll post pictures and then we can discuss the rear big-brake outboard conversion kit, prices, technical/installation needs, cooling and grip advantages here;

In short - yes, you turn some sprung weight into unsprung weight, but that's it for the minus side of the equation! (I can hear Big Swede now....)

But look, you pull all of that heat build-up away from the tranny AND the brakes, you increase stability at the outer edge of the car and you widen the stance of the rear wheels too! You gain larger brakes for the back than what most cars have on the front (290+ mm), you gain vented rotors, you gain 4-Piston calipers versus 2-Piston calipers, made from T6 billet aircraft quality aluminium and they are anodized (just like some of the bright-coloured computer internals you see) which helps with heat run-off!!!

75evo · #2 (**permalink**) 10-07-2004, 09:35 AM

JJ,

Does Dawie or Barry have any small kits? Like a 2-pot 250ish mm vented setup with parking brakes? I would be interested. I really hate the inboard setup.

junglejustice · #3 (**permalink**) 10-07-2004, 09:55 AM

I'll check.

Barry gets all of his stuff from Dawie any way...

Are you trying to keep the brakes inboard!? (Go outboard! It's much better...)

The smallest calliper from Praggia is the 4 Pot and it will run a minimum 265mm disc, with or without a handbrake....

Dunno if the 265 fits in the stock mounting spot...

75evo · #4 (**permalink**) 10-07-2004, 09:58 AM

No, the inboards have to go.

nizam · #5 (**permalink**) 10-09-2004, 09:56 AM

I absolutely agree. Not only do I want to put my rear brakes outboard, but I'd like a camber-adjustable deDion tube too.

What are Dawie's thoughts on that? Useful? overkill? Buy a 147GTA?

BigSwede · #6 (**permalink**) 10-09-2004, 04:50 PM

jj, what the h3ll are you talking about, of course outboard rule. Why would I disagree?

But I wouldn't go un-neccesary large, that's just stupid. :P

FYI: I have regular 75 brakes on my GTV, works beautifully. The disks are cross-drilled though and the booster is ditched. Real men don't use brake boosters.

junglejustice · #7 (**permalink**) 10-11-2004, 02:07 AM

Mats. just wanted to see if you were still with us....

Nizam, Dawie likes a small bit of rear-camber and I am waiting for some drawings/instructions from Ron (RS) on the conversion that he has done... I think that he told me last time that you need a spare trashed DeDion for the conversion...

75Evo, I checked; the 4-pot Praggia mounts a minimum 265 rotor (nice though...)

Jes and I are going to use the stock vented 156 front rotors (288mm with shallow mounts) for the rear of our Milanos. (Not overkill IMHO.) Dawie likes the balance with this setup and Chris from Praggia thought that it would be a good setup too (without ABS) - sorry Nizam "Well balanced" with the 8-pot 325mm X 28mm vented discs upfront...

Mezevenf · #8 (**permalink**) 10-11-2004, 06:46 AM

Quote:

Originally Posted by junglejustice

you need a spare trashed DeDion for the conversion...

BigSwede · #9 (**permalink**) 10-11-2004, 08:27 AM

jj: no offence but it sounds like you're aiming waaay high... 288mm rear discs and 8 pot front calipers?? Don't sneeze or you'll lock up, even if you don't have a foot on the brake pedal.

Mezenf: The rustier the better, lighter is better.

I have adjusted camber on my de-Dion. works very well.

AR4me · #10 (**permalink**) 10-11-2004, 08:45 AM

[quote=BigSwede]jj: no offence but it sounds like you're aiming waaay high... 288mm rear discs and 8 pot front calipers?? Don't sneeze or you'll lock up, even if you don't have a foot on the brake pedal.

Even without the brake booster?

Jes

75evo · #11 (**permalink**) 10-11-2004, 08:45 AM

Mats,

No I think JJ is going with 4-pots read with 288mm.

IMHO, 4-pot is overkill. 2-pot is more than adequate, and 250mm vented is plenty. My car has 200 bhp, maybe 220 bhp after the supercharger, not 350 bhp, so I guess there's a difference there

BigSwede · #12 (**permalink**) 10-11-2004, 08:54 AM

AR4me: I don't have a booster on my car and they are sensitive enough (269mm front with 2-pot Brembos, std rear)

75evo: Four pot in the rear? Sombody has a flaming wallet...

75evo · #13 (**permalink**) 10-11-2004, 08:57 AM

Mats: my 4-pot wilwood is 1/3 the price of a brand new rear 75 caliper.

I think Barry posted something about a 155 caliper for the rear. Sounds cheaper....

BigSwede · #14 (**permalink**) 10-11-2004, 09:21 AM

Why would you buy a brand new 75 caliper when you can get a used set for 10 bucks? :P
The front Brembos would be perfect for a rear outboard conversion and then a set of OEM 305mm-type Brembo calipers (are avalable from sheitloads of different brands and typically costs 150 bucks brand new) and matching disks from say a 24v 916 GTV.

Cheap, light and devastatingly effective... But sure, buy 8-pot calipers that only have two different pad types available (both for oval racing I guess?) at a price even a NASA engineer would think is "a bit much"

(I might exaggerate a bit for drama.

)

nizam · #15 (**permalink**) 10-11-2004, 09:27 AM

JJ - 288mm rear discs? 4-pot Praggias?

What are they using for bias adjustment? A bias bar, or some other gizmo? I suppose, for a full-race setup that would be OK but for mixed street/track, something a little less prominent would be better.

I remember when I first put in my 'new' front Brembos (out of a Porsche 944 Turbo), the bias was waaaaay off. Too much front brakes. I had to dial back some pressure to the rears to make all four wheels contribute. How did I do that? I threw away the bias valve under the brake MC. It was definitely a fluke that it worked out the way it did. I was ready to invest in some kind of bias gizmo (cabin adjustable) but I lucked out. I still like the slight front bias; makes the car very balanced on late braking into corners ... no rear-end wagging under hard braking.