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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Auto swap to 6mt



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      09-27-2012, 07:22 AM   #1
ilirduka335xi
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Auto swap to 6mt

Did anybody ever swap their transmission from automatic to 6 speed manual ? I'm thinking about doing that and I was wondering how much money it would be and how long it would take for this to be done.
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      09-27-2012, 08:34 AM   #2
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I did this to a 1997 Nissan Maxima. I also had access to the full factory service manuals. I would have never of attempted to do the swap without the manuals. I also had an entire donor car for parts. In the end, it wasn't worth the time and money spent, and I did all of the work myself. If you are planning on paying someone to do it, it would cost a small fortune. I decided that I should have just bought an aftermarket valve body.

Either upgrade your ZF transmission, or trade the car for a manual. That's what I would recommend.
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      09-27-2012, 08:38 AM   #3
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just trade your car to an MT one.
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      09-27-2012, 09:00 AM   #4
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This isnt a japcrap car.
Unless you have an actual donor car its cheaper to sell the auto and buy a manual of the same car
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      09-27-2012, 09:40 AM   #5
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Quote:
Originally Posted by enrita
just trade your car to an MT one.
+1. Unless you have done a shit ton of irreversible mods to your car, or you have the most rare combo of options possible, it would be easier and probably more cost effective to sell your car. Not only are your electronics programmed for your transmission, the gearing in the rear end is also different.
Then again, this is making an assumption that money plays a factor, which actually may not in your case. If you have the money to blow on the project, then yes, it can be done.
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      09-27-2012, 10:35 AM   #6
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This guy did it: http://www.n54tech.com/forums/showthread.php?t=17001
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      09-27-2012, 10:59 AM   #7
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A shop did it. It is physically possible, but to do it right both mechanically and programming-wise, you will lose your shirt in the process. Easier to trade in your car and get one with a manual.

But the ATs are great these days. I'd actually consider a modern AT car over a standard manual transmission, and I LOVE to row through gears, rev-match heel-toe downshift, and double-clutch heel-toe downshift. For a street/occasional track car, an AT would be great. For a full-on racecar, a DCT or traditional manual transmission are the better choices.
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      09-27-2012, 12:22 PM   #8
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Sell the AT, buy a 6MT.
Unless you are in love with that one car and have deep, deep pockets, JUST SAY NO!!!
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      09-27-2012, 01:54 PM   #9
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I think you need to read this before you jump ship on the automatic. If you're dead set on upgrading, you may want to spend the money on a newer version of the ZF automatic.

Analysis: New ZF 6-speed Auto as efficient as manuals! (sometimes)

I would verify the generation of ZF you currently have to include the version. Also, it looks like the diesel has a better torque converter due to the high torque level which would be a good upgrade option if you can find one.

Otherwise good luck with your project. If you are truly set on a manual, you really should look into trading your car. Automatics normally are easier for dealerships to move because they have a larger market scope, so don't let the dealer play head games with you if you do trade. Same year, options, milage shouldn't dig into your pocket much and you are planning to drop money on the upgrade anyway....
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      09-27-2012, 03:17 PM   #10
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I want to swap it to 6mt because I plan on upgrading my car a lot and I've heard that the automatic tran won't be able to hold up to 400 or 450. But if I swap the 6mt I could just buy a new clutch to be able to handle the power
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      09-27-2012, 03:43 PM   #11
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Quote:
Originally Posted by ilirduka335xi
I want to swap it to 6mt because I plan on upgrading my car a lot and I've heard that the automatic tran won't be able to hold up to 400 or 450. But if I swap the 6mt I could just buy a new clutch to be able to handle the power
I have an xi making the power you speak of and my transmission is fine. Has been despite much abuse.
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      09-27-2012, 04:34 PM   #12
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Quote:
Originally Posted by nailer335
Quote:
Originally Posted by ilirduka335xi
I want to swap it to 6mt because I plan on upgrading my car a lot and I've heard that the automatic tran won't be able to hold up to 400 or 450. But if I swap the 6mt I could just buy a new clutch to be able to handle the power
I have an xi making the power you speak of and my transmission is fine. Has been despite much abuse.
What do you have done ? There's been no problems at all ? And how many miles have you driven with that much power ?
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      09-27-2012, 05:50 PM   #13
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Quote:
Originally Posted by ilirduka335xi
Quote:
Originally Posted by nailer335
Quote:
Originally Posted by ilirduka335xi
I want to swap it to 6mt because I plan on upgrading my car a lot and I've heard that the automatic tran won't be able to hold up to 400 or 450. But if I swap the 6mt I could just buy a new clutch to be able to handle the power
I have an xi making the power you speak of and my transmission is fine. Has been despite much abuse.
What do you have done ? There's been no problems at all ? And how many miles have you driven with that much power ?
I have done multiple WOT runs and brake boost launches at 18-19 psi. Mods are JB4 15ohm tune (I'm a bit behind, havent installed G5 yet) DPs, Mr5 intake, meth pre and post turbo. When boosting hard I put 100 or 109 octane in the car and run close to 100% meth. I do not know how many miles because a car isnt making max power during cruising conditions, only under WOT which in my opinion wouldnt really be measures in miles, perhaps number of hard 1-3or4 gear pulls. Which I'd have no idea how many I've done.
Keep in mind that during normal driving, representative of a majority of your mileage, youre probably (hopefully) not pedal to the metal constantly, so your transmission's longevity shouldnt be a main concern.

As others have said, selling your 6AT for a 6MT will be the best way to achieve your goal.
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      09-27-2012, 08:27 PM   #14
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Quote:
Originally Posted by Wedge1967 View Post
I think you need to read this before you jump ship on the automatic. If you're dead set on upgrading, you may want to spend the money on a newer version of the ZF automatic.

Analysis: New ZF 6-speed Auto as efficient as manuals! (sometimes)

I would verify the generation of ZF you currently have to include the version. Also, it looks like the diesel has a better torque converter due to the high torque level which would be a good upgrade option if you can find one.

Otherwise good luck with your project. If you are truly set on a manual, you really should look into trading your car. Automatics normally are easier for dealerships to move because they have a larger market scope, so don't let the dealer play head games with you if you do trade. Same year, options, milage shouldn't dig into your pocket much and you are planning to drop money on the upgrade anyway....
My car with a build date of 10/06 has the 6HP21, so I would guess all 335's at least after that build date have a second generation ZF transmission.
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      09-27-2012, 08:34 PM   #15
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haha, you must not read much... Your front dif will break before your trans. I'm making over 450 hp and 500 ft lbs with NO issues (well fueling at the moment, but Shiv has a fix for that)..

Single turbo AT is making 600 hp and 500 ft lbs without issues... So you want to spend more than what a single will cost to do a trans upgrade just so you can make what I'm making already. You need help! LOL Please send your many to me at throwyourmoneyawayonstupidmods@paypal.com and I'll give you a pit pass for Shift S3ctor...



Quote:
Originally Posted by ilirduka335xi View Post
I want to swap it to 6mt because I plan on upgrading my car a lot and I've heard that the automatic tran won't be able to hold up to 400 or 450. But if I swap the 6mt I could just buy a new clutch to be able to handle the power
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      10-23-2012, 01:11 PM   #16
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Originally Posted by Wedge1967 View Post
haha, you must not read much... Your front dif will break before your trans. I'm making over 450 hp and 500 ft lbs with NO issues (well fueling at the moment, but Shiv has a fix for that)..

Single turbo AT is making 600 hp and 500 ft lbs without issues... So you want to spend more than what a single will cost to do a trans upgrade just so you can make what I'm making already. You need help! LOL Please send your many to me at throwyourmoneyawayonstupidmods@paypal.com and I'll give you a pit pass for Shift S3ctor...

Who is running Single Turbo AT?...Shiv's is a MT
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      10-23-2012, 01:48 PM   #17
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Quote:
Originally Posted by kitesurfer View Post
Who is running Single Turbo AT?...Shiv's is a MT
There is two ATs with single Turbo, if I remember correctly.
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      10-23-2012, 02:00 PM   #18
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Who is running Single Turbo AT?...Shiv's is a MT
At least 3 that I know of. Myself and two other Bay Area forum members (one is banned).
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      10-23-2012, 02:22 PM   #19
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Would cost more to fabricate this into your chassis versus tradung your current vehicle in with a manual counterpart.
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      10-23-2012, 02:44 PM   #20
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trade it for a rwd manual
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      10-23-2012, 04:08 PM   #21
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Quote:
Originally Posted by Gugs View Post
This isnt a japcrap car.
Unless you have an actual donor car its cheaper to sell the auto and buy a manual of the same car
I'd hardly refer to it as 'japcrap'. They're way better from a maintenance standpoint, BMW could learn a few lessons.

But yes, it'd be a LOT easier to just sell the car and buy another one that has a MT.
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      10-23-2012, 04:22 PM   #22
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I got a manual 6spd for sale. and by the way the guy that did do the swap, CAN'T SPELL OR WRITE FOR SH*T LMAO
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