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#1
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6HP to 8HP conversion feasibility
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#2
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Wiring diagrams are available here. https://www.newtis.info/tisv2/a/en/
The 8 speed transmission uses a different transfer case than the 6 speed. I checked out some ebay photos and the output of the 6 vs 8 speed does not look the same. The best way to do this may be a complete donor vehicle so you can get trans, tc, driveshafts, diffs and mounts. I would love to have the 8 speed in my diesel. E70 LCI diesel in Europe has it.
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2009 35d, 2006 325i & 330i |
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Interesting. I did not know that.
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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim 2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim |
#4
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Thanks. According to that, both use CAN bus and appear to be wired about the same. There's a couple pin differences and an additional connection on the 8HP for tiptronic (I think). None of that seems particularly worrisome.
At least on the V8, the transfer case bolt pattern does look the same to me? See these two auctions https://www.ebay.com/itm/2007-2010-B...cAAOSwEFhdpLeq https://www.ebay.com/itm/2011-2013-B...8AAOSwz~RdI3SR On the plus side, I can reference a 2013 xDrive35i. I'd like to keep the swap as simple as possible so if the original transfer case can bolt on and the original driveshafts can be reused, that would be fantastic. If I ask really nicely, I might be able to get a CAN bus capture from the 2013 which would definitively answer if the messaging is the same. |
#5
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To me, it looks like the output shaft is longer on the 8 speed.
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2009 35d, 2006 325i & 330i |
#6
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I also looked up the immobilizer and it looks like the CAS3 was used for the entire production run of the E70. That means it should absolutely work with the 8HP. |
#7
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Very interested in how this goes. I know the ATC700 is thought to be much stronger- and my 35d would need it. I've looked into swapping to the 3.15 of the 50i, to bring my final drive down from 3.64, to increase fuel efficiency, run at lower RPM, and generally run quieter/ more efficiently on the long haul. If you were to swap the 8 speed, I'd be very curious to see a what it takes!
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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle '01 330i- Drift car: SLR Super angle, BC coils- keep it simple '07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years |
#8
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Quote:
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2009 35d, 2006 325i & 330i |
#9
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Quote:
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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle '01 330i- Drift car: SLR Super angle, BC coils- keep it simple '07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years |
#10
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Sorry for the confusion on the 50% number. I was using a final drive calculator on some website a while ago. If I remember correctly, my current 2600 rpm at 80 mph would go to 2300 with the 3.15 dif. Then 2000 with the 8 speed.
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2009 35d, 2006 325i & 330i |
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