E60 M5 DCT Transmission Swap - Page 10 - BMW M5 Forum and M6 Forums
E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

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post #91 of 266 Old 17th February 2017, 10:43 PM
Doc GTO
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I thought the e9x M3 final drive was 3.15 on the DCT car.



Quote:
Originally Posted by Bucky View Post
These below are based on 3.62 rear end and standard 285/35/19 tires. They are within a couple of MPH either way.

EDIT: formatting does not work too well on here with the spacing below.

E60 SMG 3
Gear Gear Ratio Final Ratio RPM MPH
1 3.99 14.44 8250 46
2 2.65 9.59 8250 69
3 1.81 6.55 8250 101
4 1.39 5.03 8250 131
5 1.16 4.2 8250 158
6 1 3.62 8250 182
7 0.83 3 8250 219


M3 DCT
Gear Gear Ratio Final Ratio RPM MPH
1 4.78 17.3036 8250 38
2 2.933 10.61746 8250 62
3 2.153 7.79386 8250 85
4 1.678 6.07436 8250 108
5 1.39 5.0318 8250 131
6 1.203 4.35486 8250 152
7 1 3.62 8250 182

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2006 BMW M5: Alpine white/Full Silverstone II/Exhaust mods/AFE/H&R/Vorsteiner Carbon Hood/Lip spoiler/RPI Scoops/Apex ARC 8 Wheels/MMW Dyno tune/EVOsport pulleys
2002 E46 M3 Track Car: BoneCrusher
1994 E36 325is M Technic #5418
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post #92 of 266 Old 17th February 2017, 11:06 PM
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Quote:
Originally Posted by Doc GTO View Post
I thought the e9x M3 final drive was 3.15 on the DCT car.
It is but I used 3.61 as no-one mentioned changing the diff ratio in the thread. Otherwise just use the E9x data.
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post #93 of 266 Old 17th February 2017, 11:10 PM
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Quote:
Originally Posted by Bucky View Post
Maybe the programming will fix this, would love to know.
Not unless they've figured out way to reprogram the DSC as well. One set of wheel speeds directly feed the DME, another set is transmitted over PT-CAN from DSC to DME. Not likely anyones altering DSC module code, it doesn't have separate calibration area like the DME and no A2L (map file) is available; all changes would be made in program code via reverse engineering the disassembled code.

Way easier to swap the rear ratio and keep everyone happy.
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post #94 of 266 Old 17th February 2017, 11:16 PM
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So, someone doing a DTC conversion would also run the 3.15 rear differential?

07' M5 SILVER/BLACK
ESS VT2
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post #95 of 266 Old 17th February 2017, 11:18 PM
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So, someone doing a DTC conversion would also run the 3.15 rear differential?
Makes sense to me. Keeps the engine and DCT operating in the range it was designed for.

Let's talk DCT conversion
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post #96 of 266 Old 22nd February 2017, 06:57 AM Thread Starter
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Update! Called to find out the status regarding my car and they said they are waiting to get my custom fabricated drive shaft back to continue and install the DCT. I'm impatiently waiting to get updates and want to inform you guys as soon as I hear anything new.

2009 BMW M5 Alpine White/ Black Merino Extended Leather

Exterior
-IND E60 M5 Cosmetic Package
-Powdercoated Gloss Black OEM Wheels
-BMW M Performance Black Kidney Grilles
Performance
-Dinan High Flow Air Mass Meter and Intake Assemblies
-Dinan Stage 3 Performance Engine Software
-Dinan 13% Underdrive Crankshaft Pulley Kit
-DCT Transmission (Underway)
-Eisenmann Race Exhaust (Oval Tips)
-Supersprint Section 2 X-Pipe (Resonator Delete)

-RPI Scoops
Handling
-Dinan 21mm Adjustable Rear Anti-Roll Bar
-Dinan Supplemental Ride Quality & Handling Kit

-Dinan Performance Spring Set
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post #97 of 266 Old 22nd February 2017, 01:50 PM
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Quote:
Originally Posted by DinanE60M5 View Post
Update! Called to find out the status regarding my car and they said they are waiting to get my custom fabricated drive shaft back to continue and install the DCT. I'm impatiently waiting to get updates and want to inform you guys as soon as I hear anything new.
What rear diff ratio are they using?
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post #98 of 266 Old 22nd February 2017, 09:20 PM Thread Starter
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Quote:
Originally Posted by Bucky View Post
What rear diff ratio are they using?
Great question Bucky. I will call and ask later on to find out what rear diff ratio they're using. What do you personally think they would be using?

2009 BMW M5 Alpine White/ Black Merino Extended Leather

Exterior
-IND E60 M5 Cosmetic Package
-Powdercoated Gloss Black OEM Wheels
-BMW M Performance Black Kidney Grilles
Performance
-Dinan High Flow Air Mass Meter and Intake Assemblies
-Dinan Stage 3 Performance Engine Software
-Dinan 13% Underdrive Crankshaft Pulley Kit
-DCT Transmission (Underway)
-Eisenmann Race Exhaust (Oval Tips)
-Supersprint Section 2 X-Pipe (Resonator Delete)

-RPI Scoops
Handling
-Dinan 21mm Adjustable Rear Anti-Roll Bar
-Dinan Supplemental Ride Quality & Handling Kit

-Dinan Performance Spring Set

Last edited by DinanE60M5; 22nd February 2017 at 09:21 PM.
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post #99 of 266 Old 22nd February 2017, 09:58 PM
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Quote:
Originally Posted by DinanE60M5 View Post
Great question Bucky. I will call and ask later on to find out what rear diff ratio they're using. What do you personally think they would be using?
Who knows what they will be using. Going by discussions on here they can only use the M3 DCT diff ratio but I would love it for the to use the standard M5 diff ratio. This is the interesting part along with the transmission programming.
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post #100 of 266 Old 1st March 2017, 09:11 PM
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