[BabyMcar16]

While my M235i was in the shop for service the loaner I got was a 440i. I think the motor and stuff is the same as the M235i. Does anyone know what the gearing in the 440i is and can it be put into an M235i?

[3rdcoast228i]

FYI m235I has the n55 motor, and the 440i has b58 motor.

[BabyMcar16]

Originally Posted by 3rdcoast228i

FYI m235I has the n55 motor, and the 440i has b58 motor.

Is the gearing different?

[3rdcoast228i]

Originally Posted by BabyMcar16

Is the gearing different?

I don't know, I'm waiting for someone else to speak up.

Are they both autos?

[BabyMcar16]

Originally Posted by 3rdcoast228i

I don't know, I'm waiting for someone else to speak up.

Are they both autos?

Yes both the 8 speed auto.

[amw896]

pretty sure they are identical boxes. Software might be coded differently on the 2 series though.

[BabyMcar16]

Originally Posted by amw896

pretty sure they are identical boxes. Software might be coded differently on the 2 series though.

Is there anyone out there that makes gears for the M235i or has anyone switched to a different gear ratio?

[bryan_G01]

yes. you can buy Lsd from turner with different gear options, not sure why you would want to, your not changing lsd's for different track setups.


M235iR BMW Motorsport 3.08 Differential Kit (Diff, Axles, Hardware) ($11832.30)
F22 M235iR-Spec Custom 3.08 Differential (Polishing, 3-Clutch LSD, 3.08 Gear) (includes $1,500 core charge) ($5399.03)
F22 M235iR-Spec Custom 3.23 Differential (Polishing, 3-Clutch LSD, 3.23 Gear) (includes $1,500 core charge) ($5793.00)
F22 M235iR-Spec Custom 3.46 Differential (Polishing, 3-Clutch LSD, 3.46 Gear) (includes $1,500 core charge) ($5293.00)

[BabyMcar16]

Originally Posted by bryan_f22

yes. you can buy Lsd from turner with different gear options, not sure why you would want to, your not changing lsd's for different track setups.


M235iR BMW Motorsport 3.08 Differential Kit (Diff, Axles, Hardware) ($11832.30)
F22 M235iR-Spec Custom 3.08 Differential (Polishing, 3-Clutch LSD, 3.08 Gear) (includes $1,500 core charge) ($5399.03)
F22 M235iR-Spec Custom 3.23 Differential (Polishing, 3-Clutch LSD, 3.23 Gear) (includes $1,500 core charge) ($5793.00)
F22 M235iR-Spec Custom 3.46 Differential (Polishing, 3-Clutch LSD, 3.46 Gear) (includes $1,500 core charge) ($5293.00)

Those prices are stupid crazy.

[bryan_G01]

Originally Posted by BabyMcar16

Those prices are stupid crazy.

how much did you think a bmw custom geared lsd was going to be?

[BabyMcar16]

Originally Posted by bryan_f22

how much did you think a bmw custom geared lsd was going to be?

Not 5k

[bryan_G01]

M235iR Limited Slip Differential
How do you put all that N55 power to the ground? A standard open differential and traction control is not up to the task. A M235i needs a proper limited slip diff to handle the kind of power the N55 is capable of. For the M235iR, BMW Motorsport went above and beyond: a special multi-clutch M3 GT4-derived limited slip with stock 3.08 gears was developed. This is not just a re-worked M235i diff. Motorsport borrowed diff technology from the M3 GT4 race car. They also beefed up the output shafts with CV joints and larger diameter shafts (the stock M235i shafts will not fit with this diff). As an alternative we have our own custom performance differential for the M235i. Starting with a stock F22 diff housing, we offer it with multiple limited slip and gear ratio choices. We can also polish the bearing and gear surfaces for lower temps and smoother operation. A sample of our custom diffs are listed below (prices include core charges) or check out our full custom options by clicking the link here. Note: BMW Motorsport also equipped the Racing model with a differential cooler but this would only be necessary for long distance endurance races.

Its more like 11k +... you need to buy the kit.

[amw896]

Originally Posted by bryan_f22

M235iR Limited Slip Differential
How do you put all that N55 power to the ground? A standard open differential and traction control is not up to the task. A M235i needs a proper limited slip diff to handle the kind of power the N55 is capable of. For the M235iR, BMW Motorsport went above and beyond: a special multi-clutch M3 GT4-derived limited slip with stock 3.08 gears was developed. This is not just a re-worked M235i diff. Motorsport borrowed diff technology from the M3 GT4 race car. They also beefed up the output shafts with CV joints and larger diameter shafts (the stock M235i shafts will not fit with this diff). As an alternative we have our own custom performance differential for the M235i. Starting with a stock F22 diff housing, we offer it with multiple limited slip and gear ratio choices. We can also polish the bearing and gear surfaces for lower temps and smoother operation. A sample of our custom diffs are listed below (prices include core charges) or check out our full custom options by clicking the link here. Note: BMW Motorsport also equipped the Racing model with a differential cooler but this would only be necessary for long distance endurance races.

Its more like 11k +... you need to buy the kit.

I wonder how the m performance 235i diff stacks against this. I'm sure this one is better but I would love to see some technical docs or spec sheets.