OEM-level 8HP swaps in E-series cars

nibbtastic

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Aug 12, 2023
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My car is an E90 335 with an N55 engine. Are you saying that if I use the 8HP45 transmission, which is compatible with the N55 engine, such as the transmission used in the F35, I won't need to use cantcu to achieve it?
They were talking about a physical adapter plate between the engine and transmission. You still need to facilitate communication between the transmission and the ECU, which is what this device does.
 

YEG 2008 N54

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Sep 21, 2023
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ZF 8 HP 70 transmissions are in ram 1500 3.0L diesel trucks.. any reason they would not be useable in my E 90 335xi 6AT

 

YEG 2008 N54

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Sep 21, 2023
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ZF 8 HP 70 transmissions are in ram 1500 3.0L diesel trucks.. any reason they would not be useable in my E 90 335xi 6AT

I've received a reply from someone, he said yes they will soon have software to run the transmission, but it would need an adapter for the motor and transferase.
i guess that seems obvious. :dizzy:
 

SLOWESTN54

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Feb 9, 2021
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I've received a reply from someone, he said yes they will soon have software to run the transmission, but it would need an adapter for the motor and transferase.
i guess that seems obvious. :dizzy:
i don't think you can use any 8hp70, it has to be a bmw specific one. And at that i believe you can't use the cheaper one out of a 550i, it has to be out of a Diesel inline 6 bmw. let me know what you find and how it works out. Im intrigued by this swap but it was very difficult to find a Rwd Diesel 8hp70 in Canada.
 

YEG 2008 N54

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Sep 21, 2023
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i don't think you can use any 8hp70, it has to be a bmw specific one. And at that i believe you can't use the cheaper one out of a 550i, it has to be out of a Diesel inline 6 bmw. let me know what you find and how it works out. Im intrigued by this swap but it was very difficult to find a Rwd Diesel 8hp70 in Canada.
The guy I emailed produced the conversation kits for this topic. He says it would work technically, but the front and back would not be mountable. Meaning there's no adapter plates.
As for the diesel aspect, I think that would affect what the lock up speed on the torque converter is.

What did u pay for that transmission?
 

Josh222

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Sep 29, 2023
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I picked up a 8HP45 the other day out of a 2014 335 to use in my 2009 E61 535. Does anyone know if I can use the original flex plate that is currently in there with the 6HP, or am I going to need to track down the flex plate that would have been on that N55 powered 335?
 

Haideezy

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Oct 30, 2018
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E90 335i
Anyone in this thread using the CANTCU w/ upgraded twins? I'm using the CANTCU and currently running into issues with a 8hp45 and upgraded twins, logs are showing "Tq Limiter 4" on all WOT pulls even with a XHP stg3 flash.
 

DSM mechanix

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Dec 22, 2023
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Anyone in this thread using the CANTCU w/ upgraded twins? I'm using the CANTCU and currently running into issues with a 8hp45 and upgraded twins, logs are showing "Tq Limiter 4" on all WOT pulls even with a XHP stg3 flash.
I don't have first-hand experience here, but looking through the CANTCU Wiki, it seems that the Torque Correction Factor might help you with this in lieu of any tune changes:

https://wiki.canformance.net/doku.php?id=cantcu:integrations:bmwe6789x
(scroll to bottom of page)
 

Haideezy

New Member
Oct 30, 2018
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E90 335i
I don't have first-hand experience here, but looking through the CANTCU Wiki, it seems that the Torque Correction Factor might help you with this in lieu of any tune changes:

https://wiki.canformance.net/doku.php?id=cantcu:integrations:bmwe6789x
(scroll to bottom of page)
Kenneth reached out to me and took a look at my logs, we narrowed it down to the torque value being reported from the DME. I guess the MSD80 is known for this. I'm still in the process of getting the car dialed in, so every time there's a change in my tune I'd have to compare TCU and DME tq values from the logs and adjust the correction factor. Them TPC Stg2 turbskis are a ripper on the 8hp though, no traction 1st-4th on street tires and only traction issues in 1st-2nd on MT radials :tearsofjoy:.