E90Post
 


 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > 320d manual gearbox max torque



Reply
 
Thread Tools Search this Thread
      10-26-2013, 02:38 PM   #1
ApoelAlex
Private
Cyprus
16
Rep
62
Posts

Drives: E92 320d M Sport
Join Date: Dec 2008
Location: Cyprus

iTrader: (0)

320d manual gearbox max torque

The gearbox seems to humming a bit from 1st to 3rd gear so am asking...

Car has 84k miles...

What's the maximum torque the 320d manual gearbox can handle? Been running a map for 3 years now and I think the problem is because of the mod...

Keep in mind am changing gearbox oil every year
Appreciate 0
      10-27-2013, 03:16 AM   #2
bmwak
Major
bmwak's Avatar
United Kingdom
112
Rep
1,235
Posts

Drives: 440i M-Sport Gran Coupe
Join Date: Sep 2008
Location: London

iTrader: (4)

You'll need to give some indication on what map/power and torque output your running. What engine M47 or N47?
Appreciate 0
      10-27-2013, 03:49 AM   #3
ApoelAlex
Private
Cyprus
16
Rep
62
Posts

Drives: E92 320d M Sport
Join Date: Dec 2008
Location: Cyprus

iTrader: (0)

it's the N47 engine... No timing chain issues here...

The map is a custom one.... power is 217 hp with 450 torque
Appreciate 0
      10-27-2013, 11:01 AM   #4
ApoelAlex
Private
Cyprus
16
Rep
62
Posts

Drives: E92 320d M Sport
Join Date: Dec 2008
Location: Cyprus

iTrader: (0)

I have just checked with zf website, says max torque is 370... wtf?
Appreciate 0
      10-27-2013, 03:26 PM   #5
PaddyMcGrath
Rollin' Coal
PaddyMcGrath's Avatar
Ireland
54
Rep
185
Posts

Drives: 2006 320D M-Sport
Join Date: Nov 2011
Location: Ireland

iTrader: (0)

Sounds right but you should be able to confirm it from the part number. For example mine is: GS6-37DZ - THES

GS6 (Manual 6 Speed) - 37 (370Nm) D (Diesel) Z (ZF)

It basically means that the gearbox should survive its lifetime with 370Nm and anything over that will shorten its life span.
__________________
http://www.pmcgphotos.com/
2006 E90 M Sport | BSM | KW Variant 1 | BMW Performance | Style 95 | SSDD Motorsport | M Style | Kenwood | Lightwerkz | Hartge Japan
Appreciate 0
      10-27-2013, 05:40 PM   #6
ApoelAlex
Private
Cyprus
16
Rep
62
Posts

Drives: E92 320d M Sport
Join Date: Dec 2008
Location: Cyprus

iTrader: (0)

the map is off then.... just to be on the safe side...

even though the gearbox could already be damaged.....
Appreciate 0
      10-27-2013, 07:54 PM   #7
bmwak
Major
bmwak's Avatar
United Kingdom
112
Rep
1,235
Posts

Drives: 440i M-Sport Gran Coupe
Join Date: Sep 2008
Location: London

iTrader: (4)

Yep you need to establish what gearbox you have exactly.

The N47 Engine has several variants. The 184ps has 380nm of torque, so would be capable of more.

Also worth seeing the torque output of the official BMW performance map. Edit: the Performance map torque output is 390nm (for 177ps). If yours is 177ps too, I think your torque output is probably too much for your GB to handle. Maybe worth downtuning but as you say, damage might be already done.
Appreciate 0
      10-28-2013, 02:27 PM   #8
dj219957
Private First Class
dj219957's Avatar
United Kingdom
1
Rep
109
Posts

Drives: 2009 e90, cic idrive pro
Join Date: Aug 2013
Location: staffs

iTrader: (0)

seems odd then that the emaps and end tune maps advertise 425nm. there must be lots of "happy" (for now) customers running these tunes.
Appreciate 0
      10-28-2013, 03:09 PM   #9
PaddyMcGrath
Rollin' Coal
PaddyMcGrath's Avatar
Ireland
54
Rep
185
Posts

Drives: 2006 320D M-Sport
Join Date: Nov 2011
Location: Ireland

iTrader: (0)

Just because a gearbox is rated at 370Nm, doesn't mean it's going to catastrophically explode with anything over that. Although, the further you go above the recommended torque, the more likely you are to find yourself in trouble in the future. If your 'box is already dead, why not keep your map and source a 330D box? They're rated for around 600Nm
__________________
http://www.pmcgphotos.com/
2006 E90 M Sport | BSM | KW Variant 1 | BMW Performance | Style 95 | SSDD Motorsport | M Style | Kenwood | Lightwerkz | Hartge Japan
Appreciate 0
      10-28-2013, 06:06 PM   #10
Digitalize
Photographer
Digitalize's Avatar
United Kingdom
407
Rep
2,635
Posts

Drives: 320D
Join Date: Jun 2013
Location: UK

iTrader: (0)

Would a 330D box even fit? Completely different engine.
Appreciate 0
      10-28-2013, 06:27 PM   #11
E91-Gaz
Private
1
Rep
79
Posts

Drives: 2010 E91 318d
Join Date: Sep 2013
Location: Cardiff

iTrader: (0)

Are the 1 series boxes interchangeable? If so 123d box must be a good option as the 123d is still an n47 engine with about 400Nm as standard IRC?
Appreciate 0
      10-28-2013, 06:41 PM   #12
PaddyMcGrath
Rollin' Coal
PaddyMcGrath's Avatar
Ireland
54
Rep
185
Posts

Drives: 2006 320D M-Sport
Join Date: Nov 2011
Location: Ireland

iTrader: (0)

123D uses the same gearbox as the 330D (GS6-53DZ) so should be a direct fit, but would probably need a custom prop shaft (along with a new clutch & DMF).
Appreciate 0
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 06:17 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST