1spool

New Member
Dec 31, 2018
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ST e92 335xi
Hi everyone and Happy New Year!
I drive a single turbo (6266) e92 335xi fitted with the infamously sluggish zf6hp19 6-speed auto that can't hold power, and it's slipping with only 18psi. Instead of doing a rebuild or swapping to a manual (it's my daily and I live in busy NYC) I thought of doing a zf8hp45 swap from an e84 x1.
I can't confirm this, but it seems that the e90 and the e84 are essentially the same chassis, the e84 just having an suv body sitting on it. I came across a thread where this swap was discussed in Australia in early 2018 but they never followed up in regards to whether it worked or not.
This swap would be a great solution as the zf6 is rated to hold 295ftlb but people report them starting to slip only around 450ftlb, so applying the same 50% increase to the zf8hp45's claimed limit of 450ftlb (ZF's claim) would mean that in practice it can hold up to approx. 675ftlb.

Here is what a week's worth of research revealed:
- zf6hp19 and zf8hp45's bell housing are identical
- e92 & e84 driveshafts (front and rear) are identical, same part #
- e92 & e84 torque converters are identical, same part #
- e92 & e84 CAN control unit is identical, same part #
- e92 & e84 TCUs are identical, same part #
- Zf8's are VIN locked, which may present an issue. A tuning company I spoke to said it should not be too difficult to get around that


I spoke to xHP about this project and they said that since the zf8 is VIN locked, it communicates with the FEM and the DME before starting to operate, saying this swap would require a different CANBUS architecture.

I would love to get your insight on this project, I am pretty set on making this happen but my knowledge of electrical vehicular communications and how that sort of stuff works is very limited. I'll be posting this thread on the other forums as well. All feedback would be really appreciated.
smile.gif


**Please don't suggest a manual swap; it makes no sense to manual swap a car that is rolled off the assembly line with a manual...**
 

doublespaces

General of the Army
Oct 18, 2016
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2009 E93 335i
Before you go too far, you should check that info because you should have the ZF 6HP19TU, ZF 6HP19Z, ZF 6HP21. All of which are the same transmission, the name varies depending on which catalog you are looking at.

The ZF 6HP21 is a 21mm input shaft and is a second generation transmission as is the 6HP28 found in the diesel. The 6HP19 is a first generation transmission alongside the 6HP26 which is the one Nizpro is known for upgrading.

Regarding the swap, you're in for some interesting work because those transmissions are installed in BMW vehicles which use the FlexRays powertrain communication system, so an interpreter box would be required. You want to speak to @Bimaxtremeretro as they can do this, they just need someone's car and money, in Australia.
 

1spool

New Member
Dec 31, 2018
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ST e92 335xi
Thanks for your reply-- I have seen the thread here before with @Bimaxtremeretro and sent him a message, I'm still awaiting his response. NYC is very far from Australia, unfortunately, but maybe he can shed some light on the situation.
 

jelias17

New Member
Aug 10, 2017
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08 E93 335i
My 6hp is starting to slip I live in Florida and am looking into getting involved with this swap, I have my own shop and Have the time to do something like this. Keep us updated, you have a guinea pig in south florida now.

Thanks for your reply-- I have seen the thread here before with @Bimaxtremeretro and sent him a message, I'm still awaiting his response. NYC is very far from Australia, unfortunately, but maybe he can shed some light on the situation.
 

1spool

New Member
Dec 31, 2018
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ST e92 335xi
Good to know I’m not the only one driven to do this! I got my zf8 this morning, but I’m still at a dead end in regards to tuning. I reached out to half a dozen trans coding/tuning shops/services to no avail. No one has done this before and seems that no one wants to get into it. If you come across someone with some more info on this let me know, I’ll be happy to share more info I’ve gathered.
 

jelias17

New Member
Aug 10, 2017
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08 E93 335i
Good to know I’m not the only one driven to do this! I got my zf8 this morning, but I’m still at a dead end in regards to tuning. I reached out to half a dozen trans coding/tuning shops/services to no avail. No one has done this before and seems that no one wants to get into it. If you come across someone with some more info on this let me know, I’ll be happy to share more info I’ve gathered.

I was wondering if @Bimaxtremeretro was willing to do remote work and even remote troubleshooting in order to get this done in the U.S. As some sort of remote experiment where they guide us and we do the experiment here.
 

1spool

New Member
Dec 31, 2018
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ST e92 335xi
I reached out to him about 2 weeks ago via PM, no response yet
 

bimmerliciouss

New Member
Apr 16, 2018
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E92 335xi
I am also looking into swapping a better transmission in my 335xi.

Anyways try this place, its in Europe, they've done some random and crazy ZF8HP70 Swaps so they probably know a thing or two.
https://www.facebook.com/turbolamik/?ref=page_internal



But I do think for our platform,
we may need custom or modified ECU and perhaps even custom TCU.
 
Last edited:

1spool

New Member
Dec 31, 2018
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ST e92 335xi
Thanks, I’ll reach out to them. In regards to the TCU- the e90 tcu & e84 tcu are identical, same part number which might be helpful.
 

1spool

New Member
Dec 31, 2018
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ST e92 335xi
Turbo Lamik from Poland did this swap on a e92 335, you can find them on Facebook & youtube. I contacted them and they said they swapped in a zf8hp70, the beefiest zf8, by using an adapter plate for the bell housing and a custom tcu. Very cool stuff.
 

Prophet

New Member
May 5, 2019
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B9 Audi A4!
Turbo Lamik from Poland did this swap on a e92 335, you can find them on Facebook & youtube. I contacted them and they said they swapped in a zf8hp70, the beefiest zf8, by using an adapter plate for the bell housing and a custom tcu. Very cool stuff.

Any updates?

I’d like to swap out my ZF 6HP28 in my E90 335d for a ZF 8HP70/90/95.
 
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typedRew

Sergeant
Feb 25, 2019
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2009 335i xDrive
I would do this in a heartbeat if it was available.

That trans is the only reason I was considering an F30 so heavily before I grabbed my E90
 

Rob09msport

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Oct 28, 2017
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Honestly I think the pd upgrade is very cost effective and considering you should refresh any trans that's used for a build anyway unless it's new it really is a no brainer
 

Prophet

New Member
May 5, 2019
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B9 Audi A4!
Turbo Lamik from Poland did this swap on a e92 335, you can find them on Facebook & youtube. I contacted them and they said they swapped in a zf8hp70, the beefiest zf8, by using an adapter plate for the bell housing and a custom tcu. Very cool stuff.

Since Poland is a tough commute for those of us in North America, any chance they would sell a kit with adapter plate, bell housing, and either the TCU or a TCU flash?