Differential mods for 545i / 550i

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Jun 13, 2006 | 04:54 PM

#81

vegastrashed

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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

Quote:

Originally Posted by choi000' post='297144' date='Jun 13 2006, 05:14 PM

So any news yet about the M5 rear diff fitting our 545i's? I'm going insane waiting to find out if it fits...

I guess Hollywoodtrash and I aren't the only ones interested in the M5 differential. Dave Baron of Baron's BMW is doing research at the moment. Hopefully, I'll hear back from him at the latest Friday. Don't worry, this thread is not going to die like the other differential threads I've searched.

Jun 13, 2006 | 09:17 PM

#82

choi000

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My Ride: 2004 545i 6spd, blk on blk, HRE 540R 20x9 in front and 20x10 in rear with Pirelli PZero Neros 245/25/20 front and 295/25/20 rear. H&R springs, and Eisenmann quad exhaust, V! radar detector, black grille, limo tint all around.

Quote:

Originally Posted by jiio' post='297157' date='Jun 13 2006, 05:54 PM

Thanks! I can't wait to hear the news... hopefully it'll be good news.

Jun 16, 2006 | 04:15 PM

#83

vegastrashed

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UPDATE: Heard back from Dave Baron. He's still not certain if the swap of the diffs will work. He's still researching. I'm certain it would. I have read in other forums about e39 540s having installed e39 M5 diffs. So, I don't see why the e60 would be any different.

Jun 18, 2006 | 09:10 AM

#84

vegastrashed

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News is not good from what I heard from Dave Baron. It is not a simple swap of diffs. It still is doable but I'm pretty sure the price will increase due to the extra work and parts to make it fit. He even recommended that I look into a 545 Step diff as an alternative. Well, we have discussed that earlier here and that is still viable.

I'll give him some more time to look at the M5 diff. Once he has all the information, I'll sit and talk to him and determine whether it is cost effective to pursue this mod project.

Jun 18, 2006 | 04:55 PM

#85

hollywoodtrash

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

Quote:

Originally Posted by jiio' post='299325' date='Jun 18 2006, 10:10 AM

Jiio, let's stick with the Dinan 3.45.

Jun 19, 2006 | 09:36 AM

#86

vegastrashed

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From: San Diego, CA

Quote:

Originally Posted by hollywoodtrash' post='299442' date='Jun 18 2006, 05:55 PM

Jiio, let's stick with the Dinan 3.45.

$2K for just the Dinan diff w/o labor is kinda steep. I'll wait until I hear back from Dave Baron before I ultimately make a final decision.

Jun 20, 2006 | 04:09 PM

#87

choi000

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I was at the dealership today and I talked to the parts department guy and he said that the M5 rear diff would not fit onto the 545i/550i. He said the parts numbers were different and that if the parts numbers were the same then it would be compatible. Can anyone confirm that? He also said that the cost of an M5 rear diff was about $1800 plus you have to give your stock rear diff to them.

Jun 20, 2006 | 08:44 PM

#88

vegastrashed

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Quote:

Originally Posted by choi000' post='300561' date='Jun 20 2006, 05:09 PM

That's about the same thing I heard from Dave Baron. The price the dealer quoted you is on the higher side and you do not have to give them your stock diff if you pay the core fee ($100). This is an excerpt of two emails I got from Garry Romani:

Quote:

36102283063 IS 1294.00 PLUS 100.00 CORE PLUS SHIPPING
THANK YOU FOR YOUR INQUIRY
GARRY

THE ONLY DIF AVAILABLE FROM BMW IS REMAN. THE CORE IS PRICE THAT IS EXTRA IF YOU DO NOT RETURN A SAME TYPE DIF. SHIPPING IS EXTRA.
GARRY

I'm still waiting to hear back from Dave Baron about all his findings. As soon as I find out, you will find out too.

Jun 20, 2006 | 09:18 PM

#89

heezy545i

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Are you guys more interested in some type of LSD or different gearing?

Jun 20, 2006 | 09:25 PM

#90

vegastrashed

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From: San Diego, CA

Whatever makes me faster off the line... I guess that would be gearing.

And, my G-meter just arrived! Can't wait to use it. I guess I'll use it for the first time on Saturday.

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