Change the differential

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09-27-2006, 01:54 PM

#11

AlexFW

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My Ride: 545i SMG with Limited Slip Differential

Model Year: 2005

Quote:

Originally Posted by vegastrashed' post='339294' date='Sep 27 2006, 09:08 PM

Alright, I'm just going to sit back and wait for you to complete this mod. Hope everything works out!

Mh, yes, I hope it will work .

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09-27-2006, 04:02 PM

#12

gasterus

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My Ride: 645Ci black/red, Eibach springs, K&N air filter, Wetterauer ECU upgrade, Eisenmann 83mmx4 exhaust, 20" Sportec wheels-Michelin PS2 tires, Hamann front add-on lip

I though Dinan has a final drive ratio for the 545

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09-27-2006, 04:05 PM

#13

vegastrashed

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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

Dinan does and it costs $2K just for the part. The final drive ratio is 3.45 and I think it's coming from a 645 Step.

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09-27-2006, 04:23 PM

#14

tsilveracs

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My Ride: 06 (Oct. prod.) 530i Titanium Silver / Black Leather - prem. pkg., step,nav,park dist,comf seats,xenon, push start, comf accs, rear fold seats...can't remember anymore... Mods: Radenergie R-10's 20x 9,20x 10 Mich PS2 tires 245/35fr 285/30rr, Eibach prokit springs, AC Schnitzer front lip, ACS side skirts, ACS exhaust, ACS silver carbon interior and Hamann rear trunk spoiler...to be cont.

ok, im going to plead utter ingnorance, what does in short a differential do and why is it beneficial to swap it out (use my car for example-530i). thanks

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09-28-2006, 01:16 PM

#15

AlexFW

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My Ride: 545i SMG with Limited Slip Differential

Model Year: 2005

I need the differential of the 645ci manual/SMG : 3.23 .
1300e+taxes, here in my country .
I have to decide how to solve this situation ..

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09-29-2006, 10:04 AM

#16

JetBlack

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My Ride: 2007 BMW 550i w/SMG - JetBlack - Dinan Software - Dinan Exhaust - Anthracite Trim - Anthracite Headliner - Sport Package

I am going to def. do the Dinan 3.45 Upgrade. If you know about torque multiplication, these gears would be the equivelent of an 18% increase in TORQUE!!!! So for the post that questioned what the gear change would do it would FEEL like the 550i had 425 lb ft of torque. Dinan has had the 3.45 set up for quite a while and it was very popular in the E39 M5's as best bang/buck upgrade.

Chris

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09-29-2006, 01:08 PM

#17

AlexFW

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My Ride: 545i SMG with Limited Slip Differential

Model Year: 2005

Quote:

Originally Posted by JetBlack' post='340028' date='Sep 29 2006, 08:04 PM

Jetblack, I don't have the Steptronic but the SMG .. Thus I don't want gears so short like the 645ci steptronic (3.46) : I want 3.23 and gears with the following speeds (kmh) :

56-104-157-209-251-289

And I need 3.23 .

The diff costs 1100+taxes (530i manual/smg) or 1300+taxes (645ci manual/smg) .
[euros]

Dinan has a 3.23 diff with LSD ?
No, otherwise ...

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10-22-2006, 06:12 PM

#18

Bubbarossa

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My Ride: 2004 530i stock. 2000 Jeep Wrangler non-stock =)

Quote:

Originally Posted by tsilveracs' post='339389' date='Sep 27 2006, 05:23 PM

ok, im going to plead utter ingnorance, what does in short a differential do and why is it beneficial to swap it out (use my car for example-530i). thanks

Basically, when you change the differentail ratio, (higher numerically the lower the gear) from say, 3.15 to 3.63, this is actually lowering the gears of the car, thus giving you a little more off the line but losing some top-end speed. The problem with having "more off the line" the ring and pinion are smaller, therefore, weaker and subject to breaking unless the differential is larger or a different type. For the 530i, changing the ring and pinion would be only thing you really need to do, i doubt that you need to change the whole differential as I would expect that the smaller gears could handle the increased torque. However, if the car is equiped with a traction devince, in some cases the ring and pinion can become too small and you'll need to install a new traction device that fits.

4WD vehicles often change the ring and pinions (differentials), transfer case, and sometimes the transmission, to obtain a lower crawl ration which adds torque and slows the vehicle enabling rockcrawling at a much more effecient pace. This is also necessary when vehicles add larger tires as it helps keep the vehicle in a good (stock) rpm range.

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05-25-2007, 01:06 PM

#19

vegastrashed

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Reviving the thread.

I was at CarLab, a tuning shop, in San Jose a few days ago. Darwin floated the possibility of changing the final drive ratio from 2.93 to 4.1. He mentioned that all that needs to be replaced is the ring and pinion. That there would be no need to swap out the existing diff for another one. Is this feasible and if so, where do I pick up the ring and pinion from? Maybe bimmerworld.com?

I'm sure AlexFW will be happy to hear someone else is wanting to change the final drive ratio. I'm back to modding again.

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05-25-2007, 02:05 PM

#20

vegastrashed

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Just got word back that RDSport has the ring and pinion. I was also asked if I want to get the 4.1 with LSD! I told Darwin to get quotes for 4.1 and 4.1 with LSD. Stay tuned. If all the numbers work this is going to happen quickly.

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