New style with ABS and Dogbones - from 9/82Īs the old style rear axle seems to require something totally different, I will not dig any deeper into a big brake solution for these cars.įor everything after 9/81 the E32 750i rotors seem to be a straight fit.įound another potential option for the front rotors: E60 545i 2 piece rotors, 348x30mm, 10.2 Kg, $289 / set from Pagid.īildschirmfoto um 15.16.13 by Ben St, auf Flickr New style without ABS and Dogbones - 9/81 to 9/82 Seems like there is 3 different versions of E23 rear axles: Still looking for something that fits the rear axle. Maybe we can extend it and combine with some other brake Thread in the FAQ section.īildschirmfoto um 13.32.19 by Ben St, auf FlickrĬouple more rotors added. I still need to confirm these, so far I only put together what I could find online. Will be updated as I look at other options.īildschirmfoto um 17.08.49 by Ben St, auf FlickrĮ38 750iL front & rear order for test fitting purposes.Ĭek wrote:This should be a FAQ/Sticky. Trying to bring some order into this rotor chaos. But, they can only be used with 17“ wheels. They are available for $200-250 all day, while 911 Turbo Front calipers are easily double the money. The advantage of using a Cayenne/Touareg/Q7 6 piston caliper is simply the availability and price. This would be the biggest set available, combined with 17“ wheels. I will also do the math for a combination of 324mm E31 rotor with cayenne caliper up front, combined with the 328mm E38 rotor and 991 calipers in the back. The E34 M5 Nür rotors (345mm) are $599 a set by now. Im still looking for big options for the front axle, as the E46 Rotor has a complete different layout. I will order a set and see what it looks like. That was my biggest concern in using E46 parts in the rear, as adapter rings for the E brake shoes would have to be made.
Good news for the rear axle rotors: it seems like the E38 750iL rear rotors with 328x20 will bolt up right to the E28 hub.
I guess that a Boxster caliper with M3 rotors up front saves you about 1-1.5Kg of unsprung weight compared to a E34 540 brake.Īnd yes, the Cayenne Caliper will clear 17" wheels. But for that reason we will be offering the Ti versions.Ī M5 rotor in 300x30mm is 8600g while a solid 325mm M3 rotor is 8200g, Euro 2 piece 325mm M3 rotor is 7600g and the 2 piece 345mm M3 Comp rotor is 8600g. This should give a good reference for now. That is lighter than the factory M5 caliper (5000g). The Cayenne 6 Piston Caliper is around 4500g without pads. I will do the calculations for the weights and brake bias this weekend and post the combinations here. They should easily fit the 16" wheels with 300mm E34 rotors, potentially even with 325mm E46 M3 or 324mm E31 840Ci rotors up front. I hope to have the first prototype for 986 Rear brackets done this weekend. What master cylinder do you plan on using with these, stock 23.8 mm or the E32 25 mm unit? The weight of the Porsche calipers, pads and brackets compared to stock 540i calipers pads and brackets would be very interesting to see. I will also bring a car fitted with these brakes.Īdam_poll wrote:I'd be interested in a set of brackets to mount 986 calipers front and rear onto E34 540i discs under 16" wheels on an E28 when they are available. The goal is to have the first sets available for sale at the Vintage. The plan is to have three versions available: mild steel zinc plated, stainless steel, Titanium. The following combinations will be developed: They also have a way better choice of pads. (986, 986S, 996C2, 996C4)Īnd while E31 fronts are getting more and more expensive and hard to find ($600-750 for the last sets), Boxster calipers are readily available for $150-200 per set of 2. The only real difference I could tell so far is the Turbo front caliper, which has 36/44mm pistons.Īll the others have 36/40 Front and 28/30 Rear. There is a lot of different calipers out there from Porsche. The goal is to come up with solutions to use Boxster/996 brakes with 16” and 996 Turbo brakes with 17” wheels, all while using standard BMW rotors. Then I thought of the E23, where no real BBk is available at all. The first calculations show a nice brake bias of 67/33% F/R. The idea: let’s fit Boxster rears with the Brembo fronts. Main reason for it: I’m not to thrilled with the brake bias of the factory M5 setup under heavy braking/cornering and the Brembo would make it front heavy again, even with E34 rears. I had Brembo E31 calipers sitting in my basement for a while now, but never got around to mount them. After the last project of high strength S38 crank hubs the mill is empty again and the next project in line is ready to be accomplished.
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