F80 M3 / F82 M4 Brake Caliper/Rotor Retrofit Guide to E9x M3 - Using OEM Parts

[CalvinNismo]

Originally Posted by M3SQRD

Are you asking about using a f8x knuckle with e9x non-M dampers? If you are then the answer is no because the e9x M and f8x both have a larger diameter where the strut engages the f8x knuckle. You need to run all f8x - f8x knuckle, f8x front strut, and f8x brake calipers and rotors. E9x non-M struts will not work.

This is not strictly correct. You can use E82 M/E9x M dampers with the F8x knuckles (as I imagine the majority of people in this thread have done), or you can get adapters like this for non-M dampers.

https://www.bimmerworld.com/Suspensi...or-Sleeve.html


There are lots of brake options too.

[M3SQRD]

Originally Posted by CalvinNismo

This is not strictly correct. You can use E82 M/E9x M dampers with the F8x knuckles (as I imagine the majority of people in this thread have done), or you can get adapters like this for non-M dampers.

https://www.bimmerworld.com/Suspensi...or-Sleeve.html


There are lots of brake options too.

Correct. I accidentally typed f8x dampers instead of e9x M3 dampers which fit the f8x knuckles.

[regbf99]

Thank you for this clarification.
Regarding the ABS sensors, I'm trying to get in touch with the user "Raptorworks". (see page 6)

Originally Posted by gmx

I wonder if anyone doing this also checked their track widths and ofc camber/caster with the standard upright part numbers.

I heard from someone else they gained -0.5 NOT using the F8x camber correction parts. Can anyone please confirm... Just get it on the rack and see where you max out compared to before.

This question was never answered.
Is there an opinion now as to whether the parts with camber correction can/should be used?

The spare parts catalogue shows three versions.
Normal
+30 minutes
-30 minutes

https://www.leebmann24.com/de/de/com...lager-311121#2

[CalvinNismo]

Originally Posted by regbf99

Is there an opinion now as to whether the parts with camber correction can/should be used?

ornicar uses the -0.5 degree camber correction knuckles on his E82 125i. He has a good deal of camber without the need for camber plates.

[regbf99]

Thank you for that feedback.
That sounds good, usually you have too little chamber.

[gnx]

Originally Posted by regbf99

Thank you for this clarification.
Regarding the ABS sensors, I'm trying to get in touch with the user "Raptorworks". (see page 6)




This question was never answered.
Is there an opinion now as to whether the parts with camber correction can/should be used?

The spare parts catalogue shows three versions.
Normal
+30 minutes
-30 minutes

https://www.leebmann24.com/de/de/com...lager-311121#2

I have done the 2NH conversion using the camber corrective knuckles.

Schwenklager Sturzkorrektur rechts -30 MIN 3er 4er (31217853640) 31217853640
Schwenklager Sturzkorrektur links -30 MIN 3er 4er (31217853639) 31217853639

Front camber now is at -1.7.

[regbf99]

Thank you, gnx
The conversion is becoming clearer and clearer.
I'm still hoping for an answer from "Raptorworks" regarding the wheel bearings, as those of the M4, the M3 e92 and the 335i e92 are different.
And a confirmation about the ABS sensors, let's see if he responds.

[gmx]

What's been done here in Au is just splice cheap non-M wheel speed sensors into F8x ones. If you get used, you can get the hub, upright, sensor all in one.
Ofc, if you want correction knuckles (the only advantage), you should buy new unless you're really lucky.

[regbf99]

It's good to know that both work.
"Reportworks" gave me the tip to convert the 335i sensors.
"ornicar" used the ones from the M4 with a 335i connector.

Let's see what the used parts market in Germany has to offer.
At the moment it looks like new parts are the best option.

Which sway bar links did you use? The lengths are different for the three models (M4, e92 M3 & e92 335i).

[maddmatth]

Originally Posted by regbf99

It's good to know that both work.
"Reportworks" gave me the tip to convert the 335i sensors.
"ornicar" used the ones from the M4 with a 335i connector.

Let's see what the used parts market in Germany has to offer.
At the moment it looks like new parts are the best option.

Which sway bar links did you use? The lengths are different for the three models (M4, e92 M3 & e92 335i).

No need for any of that, there's a bracket for mounting F80 calipers to E9x M3...
https://epytec.de/en/bmw-3er-e92-e93...0-4-piston-694

Seems to get ignored on the forums for some reason. Cheaper than getting the F80 knuckles and won't affect suspension geometry.

The BMW F30/31 4-piston caliper is the same as the F80 caliper. I know of at least one mechanic in Australia that has used this kit successfully.

[tdott]

Originally Posted by maddmatth

No need for any of that, there's a bracket for mounting F80 calipers to E9x M3...
https://epytec.de/en/bmw-3er-e92-e93...0-4-piston-694

Seems to get ignored on the forums for some reason. Cheaper than getting the F80 knuckles and won't affect suspension geometry.

The BMW F30/31 4-piston caliper is the same as the F80 caliper. I know of at least one mechanic in Australia that has used this kit successfully.

at €223.75 euros, plus shipping, you aren't saving much.

Plus I much rather be using oem parts when it comes to brakes/safety. Also it puts the lower control arm in a closer position to stock compared to lowered cars on oem knuckles.

Not all F30 calipers are the same, only the 370mm M Sport ones. The unpainted 340mm ones will not work.

[regbf99]

Originally Posted by tdott

at €223.75 euros, plus shipping, you aren't saving much.

Plus I much rather be using oem parts when it comes to brakes/safety. Also it puts the lower control arm in a closer position to stock compared to lowered cars on oem knuckles.

Not all F30 calipers are the same, only the 370mm M Sport ones. The unpainted 340mm ones will not work.

Thanks for the tip, but I already know the adapter.
I see it similarly to tdott, I don't really like the construction, so it's not an option for me.

How did you procedure with the sway bar links?

[maddmatth]

Originally Posted by tdott

at €223.75 euros, plus shipping, you aren't saving much.

Plus I much rather be using oem parts when it comes to brakes/safety. Also it puts the lower control arm in a closer position to stock compared to lowered cars on oem knuckles.

Hmm maybe you can get those knuckles cheaper over there, they were much more expensive last I checked.

How much are you lowering the car for the control arm position to be an issue? I am getting coilovers, will lower mine just a little.

[regbf99]

Here in Germany, used parts are almost as expensive as new parts.
I think it's best to wait for a discount and then buy new ones.

[tdott]

Originally Posted by maddmatth

Hmm maybe you can get those knuckles cheaper over there, they were much more expensive last I checked.

Originally Posted by regbf99

Here in Germany, used parts are almost as expensive as new parts.
I think it's best to wait for a discount and then buy new ones.

Used can be found for around $300 for both here in the US.

Brand new is around $400 each.

[ninja88]

has anyone tried to fit g80 brakes on our e9x platform

[M3SQRD]

Originally Posted by ninja88

has anyone tried to fit g80 brakes on our e9x platform

Does the g8x use the same radial spacing between the caliper mounting holes? Is the width of the caliper the same (or the distance between the mounting holes centerline and caliper rotor mid thickness?

You want to put the rear EPB on your e92? This would not be straight forward and you’d have a fixed front caliper and a sliding rear caliper (and a secondary small caliper that acts like a parking brake, check out the Essex AP Racing rear kit for the g8x).

Only person that might have a caliper adapter and mounting hats is Track/S.

[tdott]

Originally Posted by M3SQRD

Does the g8x use the same radial spacing between the caliper mounting holes?

No, G8x uses a radial mounted caliper. A custom bracket would be needed and find a 5x120 rotor that would work with it.

[M3SQRD]

Originally Posted by tdott

No, G8x uses a radial mounted caliper. A custom bracket would be needed and find a 5x120 rotor that would work with it.

Yes. I know. I would not have been comparing radial mount spacing and radial mount to rotor center line if I was comparing f8x blue side mount calipers to g8x. I would not have brought up g8x sliding caliper with EPB + extra tiny parking brake caliper needed to avoid reusing EPB. I also mentioned a custom caliper adapter and mounting hats (convert 5x120 or make new 5x112) are need. However, I guess I wasn’t clear enough on what I was comparing so F87/F8x 2NH/CCB six piston and rear four piston vs. g8x front six piston and rear single piston sliding caliper.

[ninja88]

thanks guys, only asked as I found a set for sale in the local classfields for a similar price for f8x brakes

[tdott]

Originally Posted by M3SQRD

Yes. I know. I would not have been comparing radial mount spacing and radial mount to rotor center line if I was comparing f8x blue side mount calipers to g8x. I would not have brought up g8x sliding caliper with EPB + extra tiny parking brake caliper needed to avoid reusing EPB. I also mentioned a custom caliper adapter and mounting hats (convert 5x120 or make new 5x112) are need. However, I guess I wasn’t clear enough on what I was comparing so F87/F8x 2NH/CCB six piston and rear four piston vs. g8x front six piston and rear single piston sliding caliper.

You asked if the radial spacing was the same I said no. Not sure what you are on about, perhaps create another thread if you are trying to start some other project.

This topic is for F8X retrofits.

[M3SQRD]

Originally Posted by tdott

You asked if the radial spacing was the same I said no. Not sure what you are on about, perhaps create another thread if you are trying to start some other project.

This topic is for F8X retrofits.

I was answering the question in a previous post. Did I reply to a post of yours?I guess you must be the moderator on this thread? I have PFC and AP Racing brake kits so not starting a new project with f8x blue calipers that can’t handle the lower weight and higher speed of the f8x. I’ve been tracking my f82 since 2016 and had brown calipers after one weekend. I haven’t had a single issue with AP Racing brakes. I’ve been tracking my e92 M3s since 2009 and 2012 with PFC brakes.

Isn’t the f8x CCB also considered a f8x retrofit?