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#1
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Question about change dif ratios.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
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#2
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I would say(guess) not and I think speedo works off wheel sensors so diff ratio should not cause a change.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#3
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Speedo gets the speed from the back of the transmission. Change in dif will change your dash speed proportionally.
You may be able to code the ratio to get the speed corrected. Somebody that's done it can maybe answer if there is a problem when vehicle speed doesn't match the wheel speed Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#4
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haven't done it but I recall seing somewhere in NCS Expert files the speedo correction, probably put in there for winter/summer wheels.
Beyond that, I don't see an issue with doing it. Alternative question, where do you find those parts? I'd be willing to go a smidge longer on my ratios for the 4.6?
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2002 4.6is silver on black |
#5
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Quote:
I assume it is a sending unit? Where is it located? I also thought it was the wheel sensors that calculated speed.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas Last edited by bcredliner; 10-22-2019 at 11:04 AM. |
#6
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Quote:
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
#7
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Speedo picks up from a wheel sensor, not the transmission. No adjustments are necessary after swapping differential gear ratios.
The ncsexpert adjustment is there if you want to code out the 3mph optimistic speed that comes programmed into NA market bmws.
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2012 xDrive35d 2001 BMW X5 3.0i 5MT and two 1987 Corvettes - Callaway Twin Turbo and Guldstrand Grand Sport 80 Block Tester |
#8
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https://youtu.be/eOuNNG_mD6Q
Unless the X5 doesn't work like every other modern car, it will get the speed from the vss on the output shaft of the transmission. 24357507706 is the part number for my car, others may be different since it attaches to the transmission. Prove me wrong. All info I can find online points to the speedometer gets the reading from the output of the transmission. (like most cars). Point made: one of my xo buddies has a defective abs module and has no wheel speeds at all yet his speedo still works.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#9
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If you change the rear diff ratio, wouldn't you have to change the front diff ratio similarly to avoid TC wear?
AM.
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E70 2010 3.0 M57 AT Titanium Silver with Black Leather E53 2004 3.0 M54 AT Toledo Blue with Gray Leather E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten) |
#10
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Yes they have to be changed in pairs
Sent from my iPhone using Tapatalk Pro
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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