Differential mods for 545i / 550i

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Jul 6, 2006 | 04:06 PM

#101

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

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Hollywood, where are you with RD Sport? Did you talk with Evosport?

Nov 27, 2006 | 06:06 AM

#102

jaxen112

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I've been thinking about swapping out my diff for some time now, glad to see parts are becoming available for this. anybody get an LSD diff installed yet? would love to hear results.

Nov 27, 2006 | 06:34 AM

#103

AlexFW

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From: Italy, Milano

My Ride: 545i SMG with Limited Slip Differential

Model Year: 2005

WE MUST FIND TOGETHER A SOLUTION FOR FINAL DRIVE RATIO, BECAUSE OUR 545I SMG ARE TOO SLOW WITH THESE GEARS!!!!!!!!!!!!!!!!!!!!!!!!!

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Nov 27, 2006 | 01:24 PM

#104

Tulsa545

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This is really great information. What were the results of the investigation? Does the M5 Diff work? Is there another Diff with LSD that can work? What are the associated prices?

Sorry for all the questions, but this one mod could really elevate the performance of our 545/550...

Nov 27, 2006 | 02:12 PM

#105

vegastrashed

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From: San Diego, CA

No, the e60 M5 diff won't work. I had the shop that would've done the work do some research into it. They said it's cost prohibitive. It's not the same thing as swapping out a e39 M5 into a e39 540i. From what I read, that was an easy sway. The e60 M5 diff swap to 545/550 is much more complicated.

There is a diff with LSD available from Koala Motorsport available. I'm sure it was mentioned in this thread.

Nov 27, 2006 | 05:43 PM

#106

Tulsa545

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That's too bad. I spent some time on the phone with my old service advisor in Dallas at Classic BMW. They are a Dinan shop and he had just been out in California test driving E60s - he thinks they have developed an LSD version of the differential. Stay tuned...

Nov 28, 2006 | 12:17 AM

#107

AlexFW

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From: Italy, Milano

My Ride: 545i SMG with Limited Slip Differential

Model Year: 2005

Quote:

Originally Posted by vegastrashed' post='361217' date='Nov 28 2006, 12:12 AM

There is a diff with LSD available from Koala Motorsport available. I'm sure it was mentioned in this thread.

Yes, for $4400, vegas ...
Someone ask to bimmerworld.com : they should have ring and pinion for 3.38 and 3.23 for the OEM diff .
For about $600!
Someone would have to call them ..

bimmerworld told me for $2100 is possible to buy a Quaife (LSD) to insert in our stock diff, but how reacts the DSC ?

Damn it, you are there near shops that sell these parts, try to do these mods!

Nov 28, 2006 | 07:55 AM

#108

Tulsa545

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I called bimmerworld today. No really good news, though.

You can get a 3.15 gearset from bimmerworld for $500. 3.38, 3.64 and 3.91 are all priced at $1395 - which is a financial no go when you can get the entire diff from Dinan at $1995 (pre discount) with much, much less labor...

Nov 28, 2006 | 07:56 AM

#109

Tulsa545

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Would someone with the requisite skills do the calc on the 3.15? I don't think there's enough of a torque advantage to bother, but...

Nov 28, 2006 | 09:40 AM

#110

AlexFW

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From: Italy, Milano

My Ride: 545i SMG with Limited Slip Differential

Model Year: 2005

Quote:

Originally Posted by Tulsa545' post='361484' date='Nov 28 2006, 05:56 PM

Would someone with the requisite skilles do the calc on the 3.15? I don't think there's enough of a torque advantage to bother, but...

Isn't there the 3.23 ?
It would be PERFECT, FANTASTIC!

Tulsa, from 2.93 to 3.23 you would pass from (kmh) 68-116-176-230-279-320 to 56-103-157-209-251-288 .

3.15 ...
1? 63/64
2? 107/108
3? 163/164
4? 213/214
5? 259/260
6? 297/298

7% shorter than OEM 2.93 .

And $500 now are ?378 ...

If somebody find a good mechanich that knows to open differentials .. I propose to do a collection of $50-100 each one to sponsor the mod to him .

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