Vented rear disk on an e36 compact?

[minicoop900]

well i just found something interesting too, look at the repair kit for the piston and what its used on, m5,535,325,m3,850....

the list goes on, so does that mean that all those calipers could be the same? they would all have the same piston design and id imagine the same shapes, but i noticed on the m cars, they have the m stamp on the calipers, and there were different manufacturers which would mean different part numbers.ate/brembo/whoever

so could it be that all of those calipers bolt right up?

[diamondnik]

it seems that all those calipers use the same 38mm piston. however the 354 & 491 are for 12mm thick disc and 381 is for 10mm thick disc. i wonder if they would make one caliper 2mm wider. also, it does appear that 354 replaces 491 number, which means that e30 m3 and e32 735 (not 730) use same calipers (but not same diameter discs and carriers).

[e36 323ti]

Originally Posted by diamondnik

i'm scratching my head on this one... also i wonder if the 730/735 rear disc (300x10mm) would fit the ti rear hub?

Are you sure the e32 735i discs are 300x10? To me it seems like they are 300x12 . Se e.g.
Rear wheel brake-brake pad sensor - BMW parts catalog

[diamondnik]

see my last post: the 381 disc as fitted to 730 and 5xx is 300x10 according to real oem

[e36 323ti]

The AP Racing CP5211 (-22S0 and -23S0) calipers are ordered. Also a set of Z4 3.0i brake shields and brake shoes are ordered.

Had to take a decision (and a risk of failing) since the CP5211 calipers seems to be discontinued by AP Racing. By very good help from AP Racing, a dealer in the UK that had some CP5211s in stock was identified. Hopefully a solution is around the corner...

[e36 323ti]

Originally Posted by diamondnik

see my last post: the 381 disc as fitted to 730 and 5xx is 300x10 according to real oem

I do not know what you are after, but if you seek a slightly bigger solid disk for the Compact, maybe the 280x10mm disc from the z4 2.0i/2.5i is an option. The bell on those are 75.2mm while for the Compact it is 78mm...

[e36 323ti]

Calipers received. I am optimistic....





The design of the carriers started...

[chrisbec]

Beautiful calipers! That looks nice...

[ianik]

Very nice progress...

I'm stuck doing this mod right now....

[chrisbec]

Originally Posted by ianik

Very nice progress...

I'm stuck doing this mod right now....

Just curious about what you are going to do with the bake shield and bearings. Are you going to shim the Z4 brake shields to get them closer to the rotors? Are you going to pull the hub flange out to change out the brake shield?
I'm also working toward getting the Z4 rotors installed on some Z3 trailing arms. I have the Z4 brake shields and I'm considering using e36 M3 calipers since I'm using M3 calipers in the front. I think the thickness for spacer would be the difference in height between the Z4 rotor and the ti rotor (Z3 rotor in my case).

Originally Posted by chrisbec

I have an idea about how to correct the offset with the rotor to the e-brake shoes. What about switching the drive flange hub to that of a Z4? It should fit since the rear wheel bearing is the same for the ti and the Z4.

Just for posterity sake I wanted to clarify this a little. The 323ti and the Z3 2.8L (more generally the 6 cylinder Z3's) have the same wheel bearing as the Z4.

[e36 323ti]

Originally Posted by chrisbec

Just curious about what you are going to do with the bake shield and bearings. Are you going to shim the Z4 brake shields to get them closer to the rotors? Are you going to pull the hub flange out to change out the brake shield?
I'm also working toward getting the Z4 rotors installed on some Z3 trailing arms. I have the Z4 brake shields and I'm considering using e36 M3 calipers since I'm using M3 calipers in the front. I think the thickness for spacer would be the difference in height between the Z4 rotor and the ti rotor (Z3 rotor in my case).

I have a spare set of ti brake shields and a set of Z4 brake shields and is able to compare them... It seems like the Z4 brake shields cannot be used as is, since the Z4 calipers or the Z4 e-brake shoes is mounted 90 degrees offset from the 323ti application. An option is to do a cut, rotate and weld of centre of the Z4 shields in order to have the e-brake shoes properly aligned as required by the 323ti. An alternativ to the pullout of the hub flange, I think it could be arranged such that the pull out is not necessary by do a proper opening in the Z4 shields. Further, the ti brake shield also has some arrangments for the attachment of the brake pipe and brake linings which is missing on the Z4 brake shields.

I guess a first option is to do an offset of the original 323ti shields and the necessary modifications (cut or straighten the edge).

Originally Posted by chrisbec

Just for posterity sake I wanted to clarify this a little. The 323ti and the Z3 2.8L (more generally the 6 cylinder Z3's) have the same wheel bearing as the Z4.

The wheel bearings may be the same, but to my knowledge the only trailing arm that can be used from the Z3's on the Compact is the one from the Z3 Ms. The trailing arms from the the other Z3s used on the ti makes the wheel go outside the panel due to wrong wheel base. Further, both the 323ti trailing arms and the Z3 M's trailing arms are strengthen compared to the other Compacts and Z3s trailing arms. But maybe I do not understand what your point is?

[chrisbec]

Originally Posted by e36 323ti

The wheel bearings may be the same, but to my knowledge the only trailing arm that can be used from the Z3's on the Compact is the one from the Z3 Ms. The trailing arms from the the other Z3s used on the ti makes the wheel go outside the panel due to wrong wheel base. Further, both the 323ti trailing arms and the Z3 M's trailing arms are strengthen compared to the other Compacts and Z3s trailing arms. But maybe I do not understand what your point is?

Only wanted to clarify a somewhat vague statement I made earlier for the record.

I'm using these trailing arms to do the necessary modifications to get everything lined up while they are sitting on my work bench. This way I don't have to take my car off the road while I figure out this mod out. Once I get things worked out I'll either just install these trailing arms or (worst case if they won't fit) transfer the hardware over to the ti arms.

The reason I can see the that the Z3 arms will work on the ti:
- The Z3 1.8\1.9 subframe is interchangeable with the ti (same part numbers for those members, P/N 33321091151 trailing arms and P/N 33311090957 rear axle carrier).
- The same Z3 rear axle carrier that is used on the ti (P/N 33311090957) is used in all Z3 models 1.8 to the 3.0i.
Therefore, unless the body of the 6 cylinder Z3 is different than the 4 cylinder, (which it could be, but I don't think it is) the Z3 arms should fit the ti no problem.

The 6 cylinder Z3 arms are strengthened a little since they have some additional bracing that the 4 cylinder ti doesn't have as well as larger rear wheel bearings (just like the 323ti).

[mohaughn]

Can you get weight differences for the various parts when you actually go to swap everything out? Having vented rear rotors would be the best thing for my application, but the stiffer control arms will also help.

Also, Chris, I'm in Orlando, so if you do get this worked out, I wouldn't mind checking it out.

[chrisbec]

Originally Posted by mohaughn

Can you get weight differences for the various parts when you actually go to swap everything out? Having vented rear rotors would be the best thing for my application, but the stiffer control arms will also help.

Also, Chris, I'm in Orlando, so if you do get this worked out, I wouldn't mind checking it out.

Sweet, another ti guy in Orlando! Yea, lets meet up when this is done.

I'll post pictures when I get this thing together. Hopefully e36 323ti won't mind another build on his thread too since he has done a hell of a lot more work on this mod than I have and I'm just kinda riding on his coat-tails. We can compare notes on how this goes together.

[e36 323ti]

Originally Posted by chrisbec

Only wanted to clarify a somewhat vague statement I made earlier for the record.

I'm using these trailing arms to do the necessary modifications to get everything lined up while they are sitting on my work bench. This way I don't have to take my car off the road while I figure out this mod out. Once I get things worked out I'll either just install these trailing arms or (worst case if they won't fit) transfer the hardware over to the ti arms.

The reason I can see the that the Z3 arms will work on the ti:
- The Z3 1.8\1.9 subframe is interchangeable with the ti (same part numbers for those members, P/N 33321091151 trailing arms and P/N 33311090957 rear axle carrier).
- The same Z3 rear axle carrier that is used on the ti (P/N 33311090957) is used in all Z3 models 1.8 to the 3.0i.
Therefore, unless the body of the 6 cylinder Z3 is different than the 4 cylinder, (which it could be, but I don't think it is) the Z3 arms should fit the ti no problem.

The 6 cylinder Z3 arms are strengthened a little since they have some additional bracing that the 4 cylinder ti doesn't have as well as larger rear wheel bearings (just like the 323ti).

I guess you are right in that the stuff from the z3 1.8/1.9 fit the ti (318ti). My mind is towards the 323ti. Please have my appologies...
To my knowledge the 6-cylinder z3 has a different wheel base than the 4-cylinders and the rear body is wider. The 4 cylinder whel base front/rear is 1411 / 1427 mm. The 6 cylinder wheel base f/r is 1423 / 1494 mm. So it is still my gues that the rear trailing arms from the 6-cylinder z3 do not fit the 318ti (nor the 323ti)- that is - they will fit the rear axle carrier (since the carrier is the same) but gives wrong wheelbase. However I may be wrong, and is looking forward to see your final results...