[Eschmacher]

Originally Posted by casualDIYer

For programming, did you have to tell the car the rear rotor was 345/24?

I VO coded my car to 2NH. The main thing the coding changed was the rear caliper profile and what I assume is the pressure boost for both front and back.

The M performance kit coding does the same as above but with even higher values for the boost. Edit: NVM the values are the same.

Won't even try to comment on the differences between the pre-lci and lci parts.

[casualDIYer]

Originally Posted by Eschmacher

I VO coded my car to 2NH. The main thing the coding changed was the rear caliper profile and what I assume is the pressure boost for both front and back.

The M performance kit coding does the same as above but with even higher values for the boost.

Won't even try to comment on the differences between the pre-lci and lci parts.

I wonder if it's the piston size. Could it be that the

34216799461 has 40mm pistons and
34218046261 has 44mm pistons

[toxik]

Originally Posted by casualDIYer

I wonder if it's the piston size. Could it be that the

34216799461 has 40mm pistons and
34218046261 has 44mm pistons

are you sure the piston sizes are different? wouldn't there be different rebuild kits for a bigger piston, I noticed all rebuild kits are for all years, support pre LCI and LCI calipers.

[rlesko]

Originally Posted by Eschmacher

I VO coded my car to 2NH. The main thing the coding changed was the rear caliper profile and what I assume is the pressure boost for both front and back.

The M performance kit coding does the same as above but with even higher values for the boost.

Won't even try to comment on the differences between the pre-lci and lci parts.

How sure are you of this / how do you know? I remember stumbling across a post that compared CAFD files of SPBR and 2NH and there was no difference except the date.

[Eschmacher]

Originally Posted by rlesko

How sure are you of this / how do you know? I remember stumbling across a post that compared CAFD files of SPBR and 2NH and there was no difference except the date.

Ok, so you're correct and I misremembered.
Here's what the NCD/CAF tool shows me:
Stock:
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_vorne_e = P4.40_bzw_SA104 (02) <-- Front caliper size
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_hinten_e = IPS_42 (01) <-- Rear caliper size
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Hinterachse = Default_Alle_Anderen (05) <-- Rear brake pressure boost?
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Vorderachse = Default_Alle_Anderen (0B) <-- Front brake pressure boost?

2NH/SPBR:
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_vorne_e = P4.40_bzw_SA104 (02)
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_hinten_e = P2.44 (02)
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Hinterachse = 1690 (06)
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Vorderachse = 3270 (0C)

SPBR also adds another change in addition:

DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Tandemhauptbremszylinder_e = 25,40 (02)

This translates to "Tandem master cylinder" but I'm not sure what the significance of this is specifically for the SPBR kit? This could be the default value anyway and the tool just doesn't show me properly.

Interestingly, if I check the 2NH AND SPBR it reduces Hinterachse/Vorderachse back down to 05/0B??

[rlesko]

Originally Posted by Eschmacher

Ok, so you're correct and I misremembered.
Here's what the NCD/CAF tool shows me:
Stock:
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_vorne_e = P4.40_bzw_SA104 (02) <-- Front caliper size
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_hinten_e = IPS_42 (01) <-- Rear caliper size
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Hinterachse = Default_Alle_Anderen (05) <-- Rear brake pressure boost?
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Vorderachse = Default_Alle_Anderen (0B) <-- Front brake pressure boost?

2NH/SPBR:
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_vorne_e = P4.40_bzw_SA104 (02)
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Bremssattel_hinten_e = P2.44 (02)
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Hinterachse = 1690 (06)
DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Cp_Vorderachse = 3270 (0C)

SPBR also adds another change in addition:

DSC_CODIERDATEN_ALLGEMEIN 3000 > C_Variante_Tandemhauptbremszylinder_e = 25,40 (02)

This translates to "Tandem master cylinder" but I'm not sure what the significance of this is specifically for the SPBR kit? This could be the default value anyway and the tool just doesn't show me properly.

Interestingly, if I check the 2NH AND SPBR it reduces Hinterachse/Vorderachse back down to 05/0B??

This is fantastic, thank you for double checking this!

And yea, the MPBBK doesn't come with any cylinder parts or anything like that, so its curious whatever that value means. Also I've heard that the two options do not play well with one another, i.e. either you want S2NHA or SPBR under HO-WORT. Your experiment seems to verify that, but the reason remains unknown.

[Eschmacher]

Originally Posted by rlesko

This is fantastic, thank you for double checking this!

And yea, the MPBBK doesn't come with any cylinder parts or anything like that, so its curious whatever that value means. Also I've heard that the two options do not play well with one another, i.e. either you want S2NHA or SPBR under HO-WORT. Your experiment seems to verify that, but the reason remains unknown.

Not to add to the confusion, but I found some more info on the master cylinder coding. I found a russian site that I won't be linking here describing the coding between 2NH and SPBR. On the smaller engine cars with smaller brakes, they have a different master cylinder. You can see this on the 320i for example, has part number 34336851093, but optionally lists part 34336851095 for M sport brakes (2NH).

The coding in this graph from the site seems to indicate that a 335i with 2NH from the factory has different coding for the master cylinder than stock or SPBR. You might think that would be because they have different size master cylinders... nope. Realoem shows that the 328i and 335i both have the same part number ending in 1095.

So why would SPBR change the coding back down to 25, 40?? I confirmed this is indeed true with my car. Maybe this changes the characteristics of the system without actually physically changing the master cylinder?

Screenshot of the site translated. Note that GTZ seems to be brake master cylinder.

[rlesko]

Originally Posted by Eschmacher

What is "GTZ" and the vacuum that its referencing?

I'm starting to get confused, however, this only makes me more certain that I should code SPBR

[Eschmacher]

Originally Posted by rlesko

What is "GTZ" and the vacuum that its referencing?

I'm starting to get confused, however, this only makes me more certain that I should code SPBR

See my edit, GTZ seems to be referring to the brake master cylinder. About the vacuum, I dunno - I don't see any difference in the vacuum lines in realoem.

I also noticed that in the NCD tool, if I checked the P337A box (which I have) the values for hintenachse/vorderachse do not change from 05/0B when I select 2NH OR SPBR. (???)

I think the conclusion we can draw here is that it's best to stick to SPBR if you didn't have 2NH from the factory. That being said, mine is running 2NH and I haven't had any issues. Rather like the brake feel actually.