Differential mods for 545i / 550i
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Originally Posted by Znod' post='294691' date='Jun 8 2006, 02:38 PM
You probably are right about at least the M5's and M6's. I scanned 4 articles featuring the M5 or the M6. I finally found one that indicated, in its summary, that the M6 has an LSD. I could find no references to an LSD on either car in the article bodies during my quick scanning--but my quick scanning was, indeed, a quick scanning. I was thinking that both Realtyman and Ipse Dixit frequently bemoan the M5's lack of an LSD.
Cheers.
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Originally Posted by ipse dixit' post='294711' date='Jun 8 2006, 05:01 PM
Both the M5 and M6 have the BMW M Variable Differential Lock, which is BMW's version of an LSD. Not a true LSD, but does essentially the same thing.
Cheers.
Cheers.
Howdy, friend.
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Originally Posted by ipse dixit' post='294711' date='Jun 9 2006, 01:01 AM
Both the M5 and M6 have the BMW M Variable Differential Lock, which is BMW's version of an LSD. Not a true LSD, but does essentially the same thing.
Cheers.
Cheers.
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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
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-----------------------------------------
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 just sent emails to Newport BMW and Crevier BMW. I'm hoping that at least one will be able to order the part for me.
Hollywood, forget the Dinan differential and go with the OEM M5 differential. And, it's limited slip.
Hollywood, forget the Dinan differential and go with the OEM M5 differential. And, it's limited slip.
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Originally Posted by jiio' post='294751' date='Jun 8 2006, 04:00 PM
I just sent emails to Newport BMW and Crevier BMW. I'm hoping that at least one will be able to order the part for me.
Hollywood, forget the Dinan differential and go with the OEM M5 differential. And, it's limited slip.
Hollywood, forget the Dinan differential and go with the OEM M5 differential. And, it's limited slip.
Contributors
Joined: Apr 2005
Posts: 7,363
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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
Originally Posted by hollywoodtrash' post='294765' date='Jun 8 2006, 04:14 PM
You think this would be ok on our cars?
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Originally Posted by jiio' post='294771' date='Jun 8 2006, 04:18 PM
I don't see why not. It's the holy grail: LSD. I'm thinking it's just a swap of differentials. Can anyone verify? Ipse dixit, Znod, UUronL, pennetta?
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Hmmm, using Znod's calculation from an earlier post...
BMWUSA web site says the final ratio for the M5 w/ SMG is 3.62, while for the 550i with manual/SMG the final ratio is 2.93. This would yield a torque increase of 23.5% (if I got the calculation correct) - a very big difference, to be sure. Will that create a problem of having to rev the engine to high (I'm not familiar with the V8, only my I6...)?
For the automatic transmission, the final ratio for the 550i is 3.38, which would give a 7% increase in torque with the M5 diff... maybe that is not very much for the price you would pay...
Anyway, have fun!
BMWUSA web site says the final ratio for the M5 w/ SMG is 3.62, while for the 550i with manual/SMG the final ratio is 2.93. This would yield a torque increase of 23.5% (if I got the calculation correct) - a very big difference, to be sure. Will that create a problem of having to rev the engine to high (I'm not familiar with the V8, only my I6...)?
For the automatic transmission, the final ratio for the 550i is 3.38, which would give a 7% increase in torque with the M5 diff... maybe that is not very much for the price you would pay...
Anyway, have fun!
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Originally Posted by jmdhuse' post='295293' date='Jun 10 2006, 12:14 AM
Hmmm, using Znod's calculation from an earlier post...
BMWUSA web site says the final ratio for the M5 w/ SMG is 3.62, while for the 550i with manual/SMG the final ratio is 2.93. This would yield a torque increase of 23.5% (if I got the calculation correct) - a very big difference, to be sure. Will that create a problem of having to rev the engine to high (I'm not familiar with the V8, only my I6...)?
For the automatic transmission, the final ratio for the 550i is 3.38, which would give a 7% increase in torque with the M5 diff... maybe that is not very much for the price you would pay...
Anyway, have fun!
BMWUSA web site says the final ratio for the M5 w/ SMG is 3.62, while for the 550i with manual/SMG the final ratio is 2.93. This would yield a torque increase of 23.5% (if I got the calculation correct) - a very big difference, to be sure. Will that create a problem of having to rev the engine to high (I'm not familiar with the V8, only my I6...)?
For the automatic transmission, the final ratio for the 550i is 3.38, which would give a 7% increase in torque with the M5 diff... maybe that is not very much for the price you would pay...
Anyway, have fun!