Possible transmission swaps?

eyehategod · 04-19-2018, 04:57 PM

Hi All,

I'm just curious if anyone knows of anyone who's done a swap on the E9x N55 platform outside of auto -> manual. The 135i had an N55 with a DCT, is that possible? And then there's also the ZF 8-speed from the F generation, is that possible?

Kevin39 · 04-20-2018, 08:04 AM

It's all possible. I saw on another forum some of the N54 guys were working on the 8spd.

dleccord · 04-20-2018, 03:46 PM

Quote:

Originally Posted by Kevin39

It's all possible. I saw on another forum some of the N54 guys were working on the 8spd.

what benefit does the 8sp have over the 6AT? mpg?

Toome · 04-20-2018, 03:52 PM

Quote:

Originally Posted by dleccord

Quote:

Originally Posted by Kevin39

It's all possible. I saw on another forum some of the N54 guys were working on the 8spd.

what benefit does the 8sp have over the 6AT? mpg?

Faster shift times, better gearing, and I'm pretty sure it can hold more torque.

Xdrive35i2014 · 04-20-2018, 03:57 PM

Quote:

Originally Posted by Toome

Faster shift times, better gearing, and I'm pretty sure it can hold more torque.

Better fuel economy for sure due to higher overdrive gear ratio. Not too sure about shift speeds now that we have xhp.

Kevin39 · 04-21-2018, 06:44 AM

Yeah I think the big advantage was the 8spd holding more torque than the 6spd. Shift times and more gears would just be a bonus. They were acting like the 8spd is a similar transmission to what comes in the hellcats. Maybe just with different software? I'm not sure. I just skimmed it since it didn't really apply to me.

dleccord · 04-21-2018, 06:12 PM

Quote:

Originally Posted by Xdrive35i2014

Better fuel economy for sure due to higher overdrive gear ratio. Not too sure about shift speeds now that we have xhp.

but what if xhp made tunes for the 8spd?

Xdrive35i2014 · 04-22-2018, 12:54 PM

How much torque can the new 8 speed handle? Following article provides some insight from ZF on the 6 speed.

http://wardsauto.com/news-analysis/z...p-transmission

Regardless, the new 8 speed is going to be superior in many ways as it is newer.

JuniorB · 04-22-2018, 01:31 PM

The DCT trans are going to be the next best thing for this engine. With the power coming up, there will be a lot of hungry guys looking for another option other than a manual swap. It's already been done, a diy already made, this is the next big thing, the price tag and availability will be the only hurdles.

dleccord · 04-22-2018, 09:21 PM

Are the 8spd trannies dct?

Toome · 04-22-2018, 09:41 PM

Quote:

Originally Posted by dleccord

Are the 8spd trannies dct?

Nope. ZF auto

eyehategod · 04-23-2018, 08:45 AM

I would like to report back in that I did the xHP stage 3 flash on my ZF6spd this weekend and the difference is night and day...the transmission in this car was the factor that made it feel kind of dated to me. Feels completely modern now, can actually drive around in Sport mode without feeling herky jerky, and paddle shifts are at least twice as fast...amazing easy mod.

Feeling like I care less about a DCT or ZF8spd swap now that I did this...although I've driven in the 335is with a DCT and this still doesn't compare. Comes close, though.

04-19-2018, 04:57 PM	#1
eyehategod Second Lieutenant 41 Rep 220 Posts Drives: 2012 335i Xdrive (E92) Join Date: Jan 2018 Location: Washington D.C. iTrader: (0)	Possible transmission swaps? Hi All, I'm just curious if anyone knows of anyone who's done a swap on the E9x N55 platform outside of auto -> manual. The 135i had an N55 with a DCT, is that possible? And then there's also the ZF 8-speed from the F generation, is that possible?
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04-20-2018, 08:04 AM	#2
Kevin39 Lieutenant 164 Rep 411 Posts Drives: 2011 E90 N55 Join Date: Feb 2016 Location: Indiana iTrader: (0)	It's all possible. I saw on another forum some of the N54 guys were working on the 8spd.
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04-21-2018, 06:44 AM	#6
Kevin39 Lieutenant 164 Rep 411 Posts Drives: 2011 E90 N55 Join Date: Feb 2016 Location: Indiana iTrader: (0)	Yeah I think the big advantage was the 8spd holding more torque than the 6spd. Shift times and more gears would just be a bonus. They were acting like the 8spd is a similar transmission to what comes in the hellcats. Maybe just with different software? I'm not sure. I just skimmed it since it didn't really apply to me.
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04-22-2018, 12:54 PM	#8
Xdrive35i2014 Second Lieutenant 56 Rep 254 Posts Drives: X1 35I Join Date: May 2016 Location: Canada iTrader: (0)	How much torque can the new 8 speed handle? Following article provides some insight from ZF on the 6 speed. http://wardsauto.com/news-analysis/z...p-transmission Regardless, the new 8 speed is going to be superior in many ways as it is newer. __________________ Mod List: Twisted Tuning MHD tune, XHP3, ER Charge Pipe, catless DP, ER Competition FMIC, Pure Stage 2 Turbo, PURE High Flow Inlet Pipe, ER Outlet Pipe, GFB DV (Plus), Gruppe M intake, Supersprint full exhaust Last edited by Xdrive35i2014; 04-22-2018 at 01:24 PM..
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04-22-2018, 01:31 PM	#9
JuniorB Major 185 Rep 1,017 Posts Drives: 07 e60 525 N54 Join Date: Mar 2016 Location: Rhode Island iTrader: (0)	The DCT trans are going to be the next best thing for this engine. With the power coming up, there will be a lot of hungry guys looking for another option other than a manual swap. It's already been done, a diy already made, this is the next big thing, the price tag and availability will be the only hurdles.
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04-22-2018, 09:21 PM	#10
dleccord Captain 99 Rep 840 Posts Drives: 2011 BMW 335i E90 Join Date: Apr 2016 Location: Nelson, New Zealand iTrader: (0)	Are the 8spd trannies dct?
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04-23-2018, 08:45 AM	#12
eyehategod Second Lieutenant 41 Rep 220 Posts Drives: 2012 335i Xdrive (E92) Join Date: Jan 2018 Location: Washington D.C. iTrader: (0)	I would like to report back in that I did the xHP stage 3 flash on my ZF6spd this weekend and the difference is night and day...the transmission in this car was the factor that made it feel kind of dated to me. Feels completely modern now, can actually drive around in Sport mode without feeling herky jerky, and paddle shifts are at least twice as fast...amazing easy mod. Feeling like I care less about a DCT or ZF8spd swap now that I did this...although I've driven in the 335is with a DCT and this still doesn't compare. Comes close, though.
	Appreciate 0 Quote