E30 rear disc upgrade in the works

[Farbin Kaiber]

looks like they are basic rotors that can be bought from many race suppliers.

[StereoInstaller1]

Anything short of serious track use would have these rotors lasting 250,000 miles, right?

Looks awesome! Any time frame yet on this being available?

[bwh13]

Rotor is a standard Wilwood item, although it isn't one of the most common, so the price is more than a regular Wilwood replacements.

Brackets are ready now, I went to the machine shop today and he was tapping the holes for the bolts and caliper studs. Will be picking them up tomorrow.

I had 3 sets of brackets made. Brackets look almost identical to the picture.

Rotors should last a long time, especially if you use a milder pad. I would expect 40-50K miles at least. Here's the first test fitting, need a minor adjustment to the bracket holes and they will be ready.

[bwh13]

Final kit fitment is finished. Here's a pic of the kit behind the TR 15x8 wheel.

[z31maniac]

Hmmm tasty.

Although it would be really funny to see an E30 with larger rotors out back than up front. Planning on the Massive Street kit up front.

[bwh13]

We recommend using at least an 11.75" front kit to maintain the brake balance.

[gverelli]

We recommend using at least an 11.75" front kit to maintain the brake balance.

What about having the 11" front brake kit? Are they still to small to maintain brake balance?

[mutty]

How much?

[SkinnyVT]

We recommend using at least an 11.75" front kit to maintain the brake balance.

While rotor diameter plays a part in braking torque, you should be recommending caliper piston area.

[bwh13]

We have found that while keeping the piston area as close to the stock total surface area is beneficial in terms of pedal travel and pressure, keeping the rotor sizes in approximately the same size ratio results in a more balanced system.

An 11" rotor would work OK with a slightly larger rear rotor; we would prefer that is be closer to 11.5 than 11.75.

The larger rear rotor can be used if you were to limit the total pressure the rear part of the system would see, typically by using an adjustable proprotioning valve.

Since these cars have a true front/rear split, adding the adjustable valve would be fairly straightforward.

[bwh13]

List price is $1075, R3V price will be $900.