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Differential mods for 545i / 550i

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Old 06-08-2006, 08:53 AM
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This hasn't been brought up, but doesn't the M5 have a limited slip differential with a final drive ratio of 3.62? And, look at the price = $1925. I'm sure Garry from BMW Newport or the new guy at Crevier can order the part. If this is the case, I'll drop both Dinan and Koala and get this.

Differential mods for 545i / 550i-diff.jpg
Old 06-08-2006, 11:30 AM
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Originally Posted by jiio' post='294216' date='Jun 7 2006, 10:04 PM
It's gonna be the best $2K spend so far on my precious. I'm going to make the call to Koala tomorrow and give them my business then call the guy in San Diego to set up a schedule for the install.

Hollywood,
I'm gonna tear you up! That is until you get yours done. :'(
Go get em, and each other, guys.
Old 06-08-2006, 11:34 AM
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Originally Posted by jiio' post='294525' date='Jun 8 2006, 11:53 AM
This hasn't been brought up, but doesn't the M5 have a limited slip differential with a final drive ratio of 3.62? And, look at the price = $1925. I'm sure Garry from BMW Newport or the new guy at Crevier can order the part. If this is the case, I'll drop both Dinan and Koala and get this.
The M5 doesn't have LSD, does it? But, I can't imagine why a rear-end change cannot be a wonderful mod even if it not LSD. More road torque and more equivalent hp is good regardless--up to a point. What has been said is like saying that a supercharger is a waste of money because it is not LSD. LSD would be better, especially on a road course, but what's available still would provide excellent benefits no matter what kind of track--and benefits of the best possible kind--unequivocally measureable and unequivocally felt.
Old 06-08-2006, 11:38 AM
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Originally Posted by hollywoodtrash' post='294203' date='Jun 7 2006, 09:41 PM
Whoa Well done Z. Jiio and I were seriously considering this mod sometime soon. He'll probably pick it up before I do. When it's all said and done, you should cruise down to LA and have a field day with my car bring the g-meter!
That would be much fun. I'll definitely keep the opportunity in mind. Thanks.
Old 06-08-2006, 12:40 PM
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I've been looking everywhere but can't find any concrete evidence that the M5 does have a limited slip. There's been mention of it having one but that was from press releases prior to the offical release of the M5. Other than that, nada, zip, zilch, zero.

I'll still look into the M5 differential though b/c it is OEM after all. So, my warranty will still be valid right?
Old 06-08-2006, 12:59 PM
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Originally Posted by jiio' post='294639' date='Jun 8 2006, 03:40 PM
I've been looking everywhere but can't find any concrete evidence that the M5 does have a limited slip. There's been mention of it having one but that was from press releases prior to the offical release of the M5. Other than that, nada, zip, zilch, zero.

I'll still look into the M5 differential though b/c it is OEM after all. So, my warranty will still be valid right?
I think the same warranty issues would exist since the part is not offered on the car originally. Check out my early post on warranty issues.
Old 06-08-2006, 01:09 PM
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Originally Posted by Znod' post='294653' date='Jun 8 2006, 01:59 PM
I think the same warranty issues would exist since the part is not offered on the car originally. Check out my early post on warranty issues.
I'll take my chances with the OEM M5 differential.
Old 06-08-2006, 01:15 PM
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Originally Posted by jiio' post='294661' date='Jun 8 2006, 04:09 PM
I'll take my chances with the OEM M5 differential.
Doing so seems like a reasonable gamble provided BMW dealers would provide an indication of compatibility. I would not be at all surprised if the M5 part would not be OK on our 5ers.
Old 06-08-2006, 01:17 PM
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I know the M5 has LSD...in fact all M cars have (at least all current models...)

Later edit: I can bet my house that the car has a limited slip.

C'mon guys use your brain and feels rather than the eyes....feel how our E60 handle with dsc off on hard cornering. Push the throttle more and you get the rear-inner tire smoking...push it even further and you get a drift...but not as close as the ones made by the m5.
Old 06-08-2006, 01:38 PM
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Originally Posted by BetterMakeWay' post='294666' date='Jun 8 2006, 04:17 PM
I know the M5 has LSD...in fact all M cars have (at least all current models...)

Later edit: I can bet my house that the car has a limited slip.

C'mon guys use your brain and feels rather than the eyes....feel how our E60 handle with dsc off on hard cornering. Push the throttle more and you get the rear-inner tire smoking...push it even further and you get a drift...but not as close as the ones made by the m5.
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.


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