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cmbe92guy's 8hp swap
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02-08-2024, 03:22 PM | #23 |
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I have not got the paddle shifters working yet. I’m waiting to get a DCT M3 steering wheel before I wire them in. Trying to limit the amount of times I have to get under the dash lol.
Question: what trans option should I check on MHD? I’m just running an OTS tune right now. It feels like I’m getting some throttle closures at WOT not present before the swap. Rail pressure is fine. Should I let the DME mess with torque if I’m on the stock TCU tune? Maybe it’s something with the gearing that makes the car feel like it’s down on power in the higher gears. I mean not to overlook your question. The ptcan code is annoying me too. I’ll let you know if I find a fix. |
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Keystonezzzzz6.50 |
02-08-2024, 03:41 PM | #24 |
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I also hit a “torque” limiter depending on the gear, i’m single turbo with custom tune tho. so i’m not sure i just have xhp tuned auto selected in mhd + custom tune. The torque correction is WAY off tho i think and i’ll get throttle closures when WOT in 5-6-7-8 any long gears.
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02-08-2024, 04:36 PM | #25 | |
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Keystonezzzzz6.50 |
02-08-2024, 04:38 PM | #26 |
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Honestly not sure tune wise, I’ve tried flashing xhp but it’s almost like the trans doesn’t properly store the flash or something, it’ll save some options and other things it won’t. it’s weird
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02-08-2024, 06:41 PM | #27 |
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Have you tried going through Sutphin? He makes custom tunes through xHP
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03-06-2024, 02:01 PM | #29 |
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04-10-2024, 02:43 AM | #31 |
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admiring the job done
cmbe92guy
Absolutely wonderful "wiki" thread you wrote. I am going , even though a bit scared, to do the same with an E83 car, considered the platform it's the same at th end of story. sent some small message months ago with Kenneth, and it's doable. I will like to know if any update with the gears showed happen. some gears lever hole photo might be useful either.. Obviously, we need a video on downshifting ! very very Well done |
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04-15-2024, 08:28 PM | #32 | |
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04-24-2024, 11:58 PM | #33 |
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@cmbe92guy could you please email me. I own a 2011 335i xdrive. I have a 6 speed automatic that is not in the best shape. I have a spare 535i 2013(I think) xdrive 8 speed automatic transmission. Could I use the steps you used? Please email me @ejlew3221@gmail.com. Thank you.
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04-27-2024, 09:46 PM | #35 |
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04-27-2024, 09:47 PM | #36 | |
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10-14-2024, 01:17 AM | #37 | |
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So long story short, my 6hp decided to die on me after just about a month after my fluid change, I'm also thinking about the 8hp Swap, just wondering if you ever considered a 8hp from a E84 chassis. Maybe that could work without the need for adaption of the TCU to the DME. any suggestions? |
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cmbe92guy103.50 |
10-14-2024, 11:38 AM | #38 |
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Ive been thinking about this for my 335i. I'm actually interested in doing it to my N51 car, but I still have warranty.
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10-14-2024, 12:49 PM | #39 | |
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10-14-2024, 07:28 PM | #41 |
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There are guys making 500/600+ on 8hp45s. Of course not all 8hps are created equal. 8hp70/75 swaps are supported by CANTCU/lamik/htg solutions as well.
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10-14-2024, 07:57 PM | #43 |
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All 8hp70s/75s require to mate to these cars is an adapter plate and a compatible flex plate… the former is readily in stock at places like DomiWorks. All in, both are probably about half the cost of a pure trans upgrade.
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10-14-2024, 09:05 PM | #44 |
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Everything else will bolt on the same as the 8hp45? X drive and all?
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