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General E46 Forum
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Old 05-22-2014, 01:29 PM   #1
kdoubt
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Question My shifts are @ different intervals than others, do I have a differential swap/upgrd?

Ran out of room in the title. I assure you I can spell.

Anyway, I've been looking up other peoples 0-60 in car videos for the helluvit and noticed I have to change to 3rd before I hit 60, or 100 as I'm in Canada.

Here is my vehicle information: http://www.bmwarchive.org/vin/km05621.pdf

Just curious about what exactly differentiates what I'm driving every day to what I'm seeing in some videos.
Here is a video of 0-100km in my car (Skip to 1:30) :






Thanks for the help all

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Old 05-22-2014, 02:05 PM   #2
Alex323Ci
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bmw speedo is optomistic, so not the best way to determine exact speed. even harder to do when jumping on it because it's moving so much.

either lift the rear of your car and rotate the wheel one exact full revolution and count the exact number of times drive shaft turns and any increments like .25, .10 etc while doing this. if you do just a little under three (for example) you probably have a 2.93

or you could cruise for a while at 60mph and see what your rpm says. then go to the Diff Calculator site and input your car's info (like tire size/wheel size/5 speed, etc and see what it says you should be at for which ratio diff.
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Old 05-22-2014, 03:20 PM   #3
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Use a GPS to determine rpms at a given speed. Enter data and tire specs into a gearing calculator.
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Old 05-22-2014, 03:22 PM   #4
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Quote:
Originally Posted by Kubica View Post
Use a GPS to determine rpms at a given speed. Enter data and tire specs into a gearing calculator.
yeah do this.

autos have a 3.46 manuals have a 2.93 IIRC
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Old 05-23-2014, 09:54 AM   #5
kdoubt
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This could be difficult, I've got different sized tires on my rears than I do on my fronts. Winters are ready to come off, just havent purchased good summers yet.

Would there be something labeled somewhere if I jack it up?
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Old 05-23-2014, 11:28 AM   #6
Alex323Ci
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input the rear tire size

yes a white label with numbers on the diff, but it's at the top of diff

you're making this a lot harder than needs to be.
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Old 05-23-2014, 11:34 AM   #7
Alex323Ci
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go cruise 65mph in 5th gear for like a mile and tell me your rpm, and rear tire size. we'll plug the number in for you in you need
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Old 05-23-2014, 12:02 PM   #8
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Quote:
Originally Posted by Alex323Ci View Post
bmw speedo is optomistic, so not the best way to determine exact speed. even harder to do when jumping on it because it's moving so much.

either lift the rear of your car and rotate the wheel one exact full revolution and count the exact number of times drive shaft turns and any increments like .25, .10 etc while doing this. if you do just a little under three (for example) you probably have a 2.93

or you could cruise for a while at 60mph and see what your rpm says. then go to the Diff Calculator site and input your car's info (like tire size/wheel size/5 speed, etc and see what it says you should be at for which ratio diff.
Since the speedos are optimistic, that would mean the reading would be even higher than expected.

Instead, his reading is much lower. So either someone really screwed with the speedometer scaling, or he has a diff upgrade. Depending on how much it's over reading, it looks like it could be a 3.64 or even a 3.91
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Old 05-23-2014, 02:54 PM   #9
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Wouldn't his larger diameter tire throw off the speedo reading as well?
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Old 05-23-2014, 03:43 PM   #10
Alex323Ci
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Quote:
Originally Posted by Weste46 View Post
Wouldn't his larger diameter tire throw off the speedo reading as well?
yep, make the calculation of speed read lower on his speedo
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