OEM-level 8HP swaps in E-series cars

Svmp

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Dec 23, 2019
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M50 DCT & M57 DCT
E9X does not have ECO Pro/Comfort/Sport/Sport+button,how to selection Drive Mode ?
It works just the way MR-KRAKA described :sunglasses: I just want to add that you also can configure your own button(s) (real or from a CAN message) to control drive modes in any way you like.
 

Torgus

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Nov 6, 2016
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ACF 6466 E92 + METH
e-than-you-can-afford-pal-more-than-you-can-afford.gif


jk

Be interesting to know what a shop would charge that has done a few of these. All in sourcing the parts etc. My guess is the cost is prohibitive and it only makes sense if you DIY it like the OP.
 
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mang.vang

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Sep 28, 2017
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09 e90
Yeah it doesn't seem so difficult especially with being able to code without having to send your tcu out. Ive seen a few 8hp45s fs locally for about $500 and running into this thread had me curious to see if it made sense cost wise to my wallet lol.
 
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MR-KRAKA

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May 23, 2020
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A lot of factors in there but for me with a “bolt on” 8HP45X I’m well under 2K all in on my swap. That’s DIY No adapter plates needed… You would have to explain in depth what you are asking for to a shop to get a realistic quote if not doing the work yourself.
 

mang.vang

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Sep 28, 2017
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09 e90
A lot of factors in there but for me with a “bolt on” 8HP45X I’m well under 2K all in on my swap. That’s DIY No adapter plates needed… You would have to explain in depth what you are asking for to a shop to get a realistic quote if not doing the work yourself.
I will definitely be doing the work myself if I were to decide on this transmission swap.
 

typedRew

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Feb 25, 2019
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2009 335i xDrive
hp70 xdrive for a 08 535 wagon, being as heavy as it is, I think its smarter to go for the larger unit even if I dont think i'll make a bucket of torque. Thoughts? Would a hp45 tolerate 650ftlbs and 4300lbs? Its the easier swap, but I dont want to bother if its just going to burn up.

I've been trying to gather information on this and I havent found anything searching. I see a lot of non BMW awd transmissions on ebay. Is that just completely off the table? Should I only be searching for BMW versions? Is there a one stop shop for a 70 xdrive swap kit?
 

MR-KRAKA

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May 23, 2020
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hp70 xdrive for a 08 535 wagon, being as heavy as it is, I think its smarter to go for the larger unit even if I dont think i'll make a bucket of torque. Thoughts? Would a hp45 tolerate 650ftlbs and 4300lbs? Its the easier swap, but I dont want to bother if its just going to burn up.

I've been trying to gather information on this and I havent found anything searching. I see a lot of non BMW awd transmissions on ebay. Is that just completely off the table? Should I only be searching for BMW versions? Is there a one stop shop for a 70 xdrive swap kit?
I have an E61 for might winter warrior as well I think you may be underestimating on the weight lol. Panoramic sunroof? Anyways I would go the 8HP70 route if I were swapping that one especially. That being said the 45x has handled around 600ft/lb in my E90 just fine. I do wish I had the extra headroom though. I believe you will need an adapter plate going that route which will lead into a custom driveshaft from what I saw in my E90 xDrive. The E61 could be more forgiving in overall length but it’s an unknown until you get there with significant additional costs associated. You could invest in beefing up a 45 some too for an easier install but that is pricey as well.
 

typedRew

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Feb 25, 2019
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I have an E61 for might winter warrior as well I think you may be underestimating on the weight lol. Panoramic sunroof? Anyways I would go the 8HP70 route if I were swapping that one especially. That being said the 45x has handled around 600ft/lb in my E90 just fine. I do wish I had the extra headroom though. I believe you will need an adapter plate going that route which will lead into a custom driveshaft from what I saw in my E90 xDrive. The E61 could be more forgiving in overall length but it’s an unknown until you get there with significant additional costs associated. You could invest in beefing up a 45 some too for an easier install but that is pricey as well.

Yeah, whatever goes in it will be stock, i dont like tampering with oem internals in anything.

The reason im concerned about the larger 70-75 swap is the extra parts and steps to take, where as a 45-50 is nearly bolt on.

My car on the scales is 4290 with half tank of fuel, so over 4300 with a full tank and 4500 with driver. Yes, it has pano, all 535 tourings do. So yeah, not light.

Do we have a limit to newest model year we can use the 8hp50 from? they made the 335i GT with n55 into 2017, thats a damn near new transmission and with it being almost bolt on, might be worth a shot and see what happens.

Is yours 600lbft at the crank or wheels? Im about the same to the wheels.
 

MR-KRAKA

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May 23, 2020
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Yeah, whatever goes in it will be stock, i dont like tampering with oem internals in anything.

The reason im concerned about the larger 70-75 swap is the extra parts and steps to take, where as a 45-50 is nearly bolt on.

My car on the scales is 4290 with half tank of fuel, so over 4300 with a full tank and 4500 with driver. Yes, it has pano, all 535 tourings do. So yeah, not light.

Do we have a limit to newest model year we can use the 8hp50 from? they made the 335i GT with n55 into 2017, thats a damn near new transmission and with it being almost bolt on, might be worth a shot and see what happens.

Is yours 600lbft at the crank or wheels? Im about the same to the wheels.
The Canformance wiki says all F series 1st/2nd gen trans are supported. I wouldn’t get too hung up on build date rather than mileage. I personally don’t think the price difference is worth it between the 45/50 as far as their ability to hold power they are identical. The 45 may even have an advantage since they switched to a “more efficient” oil pump on the 50 that runs at 1.5 bar less pressure... You could read about it some here https://www.car-engineer.com/second-generation-zf-8-speed-automatic-transmission/

You could go after whichever model seems to have the most support or latest features from XHP. Your XHP license will be dependent on the donor transmissions vin. I haven’t dyno’d but it comes to right around 600whp based on trap speed/weight. Just a typical maxed 17T setup with meth.
 

typedRew

Sergeant
Feb 25, 2019
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2009 335i xDrive
As far as price, im seeing nearly no difference, with the 50 almost being cheaper if im comparing mileage for mileage. Which is why im asking, I found a 19500 mile 8hp50 out of a 2017 335 GT for $450 about 40 miles from my house. So im considering using it and if it dies, then moving to a larger unit. I really just feel like, if the 6hp can more or less tolerate it, this has to at least match it. Who knows until its tried i guess.

Ill read up on your link, thank you.
 
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