[siado]

Looks like the flywheel may be the culprit for me. The 128 flywheel 11227548102 has a flex plate that protrudes quite a bit in comparison to the 2011 528 (N52/8HP45) flywheel.

128


528

[pp2]

Originally Posted by cheerio

Great to see someone giving it a go!
I think you might be better off using E84 coding/firmware instead of E70; the E70 seems to be set up differently to the E89 family.

Flash an E84 ZB to the EGS. IIRC, when I tried this it seemed to work aside from a DSC code. You shouldn't have to mess around with a E70 CAS. Use a JBBFE 3 from a late E90 or perhaps an E84. E84 electronic shifter should work once wired up.

Thanks for being the guinea pig and testing this out, I'm keen to hear how it goes.

Hey,

Do you happen to remember what the DSC code was?
As I can find online regarding this problem, seems like it would be hard to solve since the DSC units are older in e90s. In the xDrive models, when the 8hp transmission goes into 8th gear, the DSC throws an error and goes into emergency mode (8 can't be represented with 3bits???).
How did you plan to proceed to solve this?
Did you only use the Yanhua for programming and NcsExpert for coding?
This thread is as close as it gets to a full OEM 8hp in e90 solution, so I think it's worth asking

Cheers

[raphiilouu]

Originally Posted by siado

I am in the middle of this currently with an E82 128i and 8HP45 from a 2011 535.

I gave it a shot with the N55 torque converter today and it looked like the bell housing didn't want to seat fully. The N55 converter is a bit longer than the 6L45 N52 converter and has different spline pattern. I'm thinking I'll try an N20 converter and see how it goes.

I have the Seems Legit driveshaft for the M3 DCT swap and CANTCU with an F82 M4 shifter, so the transmission cross bracket and torque converter are the last bits to figure out.

RealOEM shows the E89 z4 sdrive 28i had the 8HP45 and used the same rear mount bracket as the 128i. https://www.realoem.com/bmw/enUS/sho...diagId=22_0106

Didn't realize this until I got home today or would have attempted to bolt it up in the car. Can't get back to it until Tuesday, but will report back.

Thanks for the answer

I’ve been looking for some more infos but I can’t find any.

The n20 converter mounting is different with the flex plate not being flat, and that may cause an issue apparently with the n52 flywheel.

I’d like to give it a shot however as that’s a daily driven I can’t screw it up, hence the reason I look up EVERYTHING to make sure I have no bad surprises under the car.

For now, I’ve seen that the transmission mounts are compatible, the ATC 300 looks compatible with the 8hp45x awd version (not 100% sure though) and the CANTCU offers a full compatibility.
The only thing I have to figure out is which TC should I get and how to make it work.

[weste46]

Originally Posted by siado

Looks like the flywheel may be the culprit for me. The 128 flywheel 11227548102 has a flex plate that protrudes quite a bit in comparison to the 2011 528 (N52/8HP45) flywheel.

128


528

Keep us updated on your progress, it would be really cool to see a 128i with an 8HP!

[sunnyjay]

In for updates. Can't wait to see the progress on this.