Differential mods for 545i / 550i

Reply Subscribe

Thread Tools

Search this Thread

May 22, 2006 | 04:33 PM

hollywoodtrash

Thread Starter

Senior Members

Joined: Apr 2006

Posts: 755

Likes: 0

From: Huntington Beach, CA

My Ride: 2007 550i, Black Sapphire, SMG, M-Aerokit, Sports Package, Comfort Access, Logic 7,

Has anybody installed a Dinan Differential on their E60? I am not too familiar with this part, does it increase the acceleration rate of the car?

May 22, 2006 | 05:05 PM

UUronL

Contributors

Joined: Mar 2005

Posts: 2,573

Likes: 0

My Ride: 2006 530i Sport Silver Gray - Black Leather - Anthracite Maple Manual Transmission Premium Audio Cold Weather Package Rear sunshade Sirius Radio Autobahnd Roadblock (3M) film kit

Quote:

Originally Posted by hollywoodtrash' post='286288' date='May 22 2006, 08:33 PM

Has anybody installed a Dinan Differential on their E60? I am not too familiar with this part, does it increase the acceleration rate of the car?

What model do you currently own? Find out the final drive ratio and see what it is. The cars are nearly all different. BMW publishes it under "technical data" on the website.

For the 530i, the automatic cars are already 3.64:1. The standard shift cars are 3.23:1.

For the 550i, the automatic cars are 3.38:1 and the standard shift cars are 2.93:1.

The higher the final drive ratio, the faster the acceleration.

May 22, 2006 | 05:16 PM

vegastrashed

Contributors

Joined: Apr 2005

Posts: 7,363

Likes: 1

From: San Diego, CA

My Ride: 2007 E63 AMG | Obsidian Black | Schwarzes Nappa | Black BirdEye Maple | Premium II Package | Electronic Trunk Closer | Parktronic Engine: RPi/Powerchips custom ECU tune, RPi Ram Air Kit (BMC filter, scoops), RennTech Sport exhaust, secondary cats, charcoal and resonator delete, custom AAA x-pipe Exterior: 50% side windows / 35% rear window Formula One Pinnacle Series | Flat AMG hood emblem Suspension: Renntech Lowering Module Wheels/Tires: Radenergie R10, Falken FK452 245/30/20, Yokohama ADVAN Sport 285/25/20 ----------------------------------------- 2005 545i Sport SMG | Ti Grau | Schwarzes Dakota | Anthracite Maple | Logic 7 | Nav Engine: Custom AFE CAI, Superchips ECU remap, Sprint Booster, RDSport Dual Exhaust Conversion with Quad Pipes and X-pipe, 3 resonators deleted, 90mm tips! Exterior: M-Tech Aero kit | M5 Mirrors | M5 Rear Bumper | Trunk Lid Finisher | Vorsteiner decklid spoiler | 50% Formula One Pinnacle Tint Suspension and Brakes: Bilstein PSS9 coilovers, JBT BBK: 16" cross-drilled rotors, 8 piston and 15" cross-drilled rotors, 4 piston Wheels: VIP Modular VR 02 20x9F, 20x10R | Toyo T1R 245/30/20F, 285/25/20R Lights: PIAA 4150K Xtreme White Plus fog lights, AIB v3 MOST IMPORTANT: Hardwired V1; =) ED Date: 4/7/05, Re-delivery date: 5/21/05

I spoke with hollywoodtrash about his car. He's going to get a 550i SMG. It's supposed to arrive sometime in early to mid June.

May 22, 2006 | 05:37 PM

hollywoodtrash

Thread Starter

Senior Members

Joined: Apr 2006

Posts: 755

Likes: 0

From: Huntington Beach, CA

My Ride: 2007 550i, Black Sapphire, SMG, M-Aerokit, Sports Package, Comfort Access, Logic 7,

Quote:

Originally Posted by UUronL' post='286298' date='May 22 2006, 08:05 PM

What model do you currently own? Find out the final drive ratio and see what it is. The cars are nearly all different. BMW publishes it under "technical data" on the website.
For the 530i, the automatic cars are already 3.64:1. The standard shift cars are 3.23:1.

For the 550i, the automatic cars are 3.38:1 and the standard shift cars are 2.93:1.
The higher the final drive ratio, the faster the acceleration.

Thanks UU, I see what you are saying now. So does that mean if I'm going 60 with a Dinan Differential, the RPM will be higher if I was going 60 with a stock differential?

Sup Jiio!

May 22, 2006 | 06:12 PM

UUronL

Contributors

Joined: Mar 2005

Posts: 2,573

Likes: 0

My Ride: 2006 530i Sport Silver Gray - Black Leather - Anthracite Maple Manual Transmission Premium Audio Cold Weather Package Rear sunshade Sirius Radio Autobahnd Roadblock (3M) film kit

Quote:

Originally Posted by hollywoodtrash' post='286308' date='May 22 2006, 09:37 PM

Thanks UU, I see what you are saying now. So does that mean if I'm going 60 with a Dinan Differential, the RPM will be higher if I was going 60 with a stock differential?

Sup Jiio!

If I'm thinking about it correctly, then I think the answer is yes.

2.93:1 to 3.45:1 is a pretty good jump.

May 22, 2006 | 06:46 PM

pennetta

Contributors

Joined: Mar 2004

Posts: 2,303

Likes: 1

From: Long Island, NY

My Ride: 2008 535i: June 6th start build, complete June 17th, at NY Port July 5th, at dealer July 10th, took delivery Friday July 13- Plantimum Bronze/Natural Brown Leather/Light Poplar, Sport Package, Sport Auto, Active Steering, Premium Package, CWP & PDC. Dinan Performance Software 384hp & 421 ft/lbs.

Is the Dinan unit a limited-slip? If it is, it will also aid in acceleration.

May 22, 2006 | 07:58 PM

hollywoodtrash

Thread Starter

Senior Members

Joined: Apr 2006

Posts: 755

Likes: 0

From: Huntington Beach, CA

My Ride: 2007 550i, Black Sapphire, SMG, M-Aerokit, Sports Package, Comfort Access, Logic 7,

Quote:

Originally Posted by pennetta' post='286331' date='May 22 2006, 09:46 PM

Is the Dinan unit a limited-slip? If it is, it will also aid in acceleration.

negative on the limited slip

May 22, 2006 | 08:53 PM

vegastrashed

Contributors

Joined: Apr 2005

Posts: 7,363

Likes: 1

From: San Diego, CA

Is there a con? Only one I can think of is your gas mileage will decrease somewhat. And correct me if I'm wrong, but you will not gain any additional HP but provide more power to the wheels thus a faster acceleration?

May 23, 2006 | 05:11 AM

blackbird6SPD

Members

Joined: Dec 2004

Posts: 110

Likes: 0

From: NEW JERSEY

My Ride: I GOT A 2007 TITANIUM GRAY/AUBURN LEATHER 545I 6SPD MANUAL. COLD WEATHER PACKAE, PREMIUM, PREMIUM SOUND LOGIC 7, SPORT.

Does DINAN really have a differential for the new 550i?

May 23, 2006 | 05:37 AM

#10

znod

Contributors

Joined: Aug 2005

Posts: 6,554

Likes: 0

From: Austin TX

My Ride: 2014 X5 xDrive 5.0 M Package Carbon Black Metallic/2008 M Roadster Imola Red

Quote:

Originally Posted by blackbird6SPD' post='286522' date='May 23 2006, 08:11 AM

Does DINAN really have a differential for the new 550i?

The Dinan website says "yes" for both the 550i and the 545i manuals and SMGs. Should provide much better acceleration, assuming one knows how to deal with potential wheel spin, from greatly increased rear-wheel torque. Proportionately higher RPM given speed. Proportionately worse gas mileage. Might mate well with SMG given the ability to use AA, etc. Might produce difficult to control wheel spin in manual given use of the max HP technique of turning both DSC and DTC off. If both are not turned off, engine management might seriously retrard HP given wheel spin, etc. Same might happen to some extent with SMG. In general, rear end change is a very desirable mod because, if the rear end is increase signicantly numerically, then such a change undeniably provides a noticeable and quantitatively determinable increase in rear wheel torque. The downside of the Dinan piece is that one can't simply exchange the 3rd member. That is, the gears have to be swapped. Doing so and getting the gears aligned properly is doable, but not easy. If not aligned properly, the result will be noise and premature wear. One would want to use a very experienced technician.

Reply Share

First
Prev
1 / 12
Next
Last