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Old 10-09-2012, 11:45 AM   #1
MercForHire
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Question "RPM vs speed at each gear" table

Hi is there any way to calculate the exact rpm for each gear at every speed with 10 km/h increments.
I want to make a table and commit that to memory so I can perfect revmatch each time.
I realize this table varies with different diff ratios. But any table would be a good start.
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Old 10-09-2012, 11:49 AM   #2
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www.bokchoys.com most likely has something
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Old 10-09-2012, 12:12 PM   #3
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Plug in your gear and final drive (diff) ratios into Live For Speed (LFS), then drive the car on the simulated track using digital tachometer view.

Worked for me when I was wondering what highway RPM would be for my various cars.
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Old 10-09-2012, 12:41 PM   #4
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Well, I don't have a table, but with a 3.07 diff, you can go by the following this "2k RPM" rule. It works pretty well for me and is really easy to remember. With the following, you'll be veeeery close to 2k RPM at these speeds in these gears (in an E46, that is):

1st, 10mph
2nd, 20mph
3rd, 30mph
4th, 40mph
5th, 50mph
6th, 60mph
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Old 10-09-2012, 03:25 PM   #5
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Originally Posted by MercForHire View Post
Hi is there any way to calculate the exact rpm for each gear at every speed with 10 km/h increments.
Yes, simple physics, diameter of tire times 3.14, take into account the transmission ratio and rear end ration....... convert your tire size units to miles.....

Or you could simply search Yahoo for "Speed in MPH calculation" and find this link: http://www.race-cars.net/calculators...alculator.html

or this one- http://home.netcom.com/~sgalaba/mph.htm

this one gives a table listing three gears: http://www.wallaceracing.com/gear-speed.php
..... SEARCH is your Friend!!
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Old 10-09-2012, 03:27 PM   #6
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QUOTE=MercForHire;14799689]Hi is there any way to calculate the exact rpm for each gear at every speed with 10 km/h increments.
I want to make a table and commit that to memory so I can perfect revmatch each time.
I realize this table varies with different diff ratios. But any table would be a good start.[/QUOTE]

Yes there are many ways to do it. I will do it right now since I'm bored. BRB

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Old 10-09-2012, 03:28 PM   #7
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Originally Posted by NOVAbimmer View Post
www.bokchoys.com most likely has something
this link is horrendous
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Old 10-09-2012, 03:28 PM   #8
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They should have this table printed on the dashboard or something.
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Old 10-09-2012, 03:45 PM   #9
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http://www.bokchoys.com/differential/faq.htm
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Old 10-09-2012, 03:59 PM   #10
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I just made a nice table. It is setup for a 330Ci 5-speed manual with 245/40-17s on the rear wheels. You can put in anything.

https://www.dropbox.com/s/r1rxxal8mv...0vs%20RPM.xlsx

Use a wheel radius in METERS (you'll have to calculate that yourself). Unfortunately, the wheel radius changes with speed and load, so an average is the best I can do. Ratios are unitless by definition.

Attached a screenshot of the plot for those who are without excel.

Wow that used up exactly the time I had left until I leave work hahahaha.
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Old 10-09-2012, 04:03 PM   #11
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Originally Posted by MercForHire View Post
They should have this table printed on the dashboard or something.
I have heard of that before. Oh yeah, this guy had it:
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Old 10-09-2012, 04:14 PM   #12
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Originally Posted by WDE46 View Post
I just made a nice table. It is setup for a 330Ci 5-speed manual with 245/40-17s on the rear wheels. You can put in anything.

https://www.dropbox.com/s/r1rxxal8mv...0vs%20RPM.xlsx

Use a wheel radius in METERS (you'll have to calculate that yourself). Unfortunately, the wheel radius changes with speed and load, so an average is the best I can do. Ratios are unitless by definition.

Attached a screenshot of the plot for those who are without excel.

Wow that used up exactly the time I had left until I leave work hahahaha.
can you make one for a 3.38 diff. this one is the stock 2.93 i assume
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Old 10-09-2012, 04:17 PM   #13
MercForHire
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Quote:
Originally Posted by WDE46 View Post
I just made a nice table. It is setup for a 330Ci 5-speed manual with 245/40-17s on the rear wheels. You can put in anything.

https://www.dropbox.com/s/r1rxxal8mv...0vs%20RPM.xlsx

Use a wheel radius in METERS (you'll have to calculate that yourself). Unfortunately, the wheel radius changes with speed and load, so an average is the best I can do. Ratios are unitless by definition.

Attached a screenshot of the plot for those who are without excel.

Wow that used up exactly the time I had left until I leave work hahahaha.
Thanks so awesome :thumb up:
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Old 10-09-2012, 04:27 PM   #14
MercForHire
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here is teh metric table.
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Last edited by MercForHire; 10-09-2012 at 04:29 PM.
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Old 10-09-2012, 04:57 PM   #15
WDE46
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Originally Posted by E46Mango View Post
can you make one for a 3.38 diff. this one is the stock 2.93 i assume
You can edit the file. Just change the final drive ratio value. Maybe I should have just put that as Diff ratio.
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