2011 M6 Gearing Spreadsheet
1 Attachment(s)
I have compiled a spreadsheet that details RPMS in each gear at a given speed for 3.31, 3.55, and 3.73 rear gears. There have been many posts recently asking which gears should I choose. This spreadsheet answers all of those questions.
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Originally Posted by coffeejolts
(Post 5878987)
I have compiled a spreadsheet that details RPMS in each gear at a given speed for 3.31, 3.55, and 3.73 rear gears. There have been many posts recently asking which gears should I choose. This spreadsheet answers all of those questions.
3.73 - 111.5 mph (18" All-Seasons 765 rpm) - 111.1 mph (19" All-Seasons 768 rpm) - 111.8 mph (19" Summer Rubber 763 rpm) 3.55 - 117.2 mph (18" All-Seasons 765 rpm) - 116.7 mph (19" All-Seasons 768 rpm) - 117.5 mph (19" Summer Rubber 763 rpm) 3.31 - 125.7 mph (18" All-Seasons 765 rpm) - 125.2 mph (19" All-Seasons 768 rpm) - 126.0 mph (19" Summer Rubber 763 rpm) As you can see you appear to be off by 4 mph on average. |
It all depends upon what you believe is the correct tire diameter / revolutions per mile. I calculated everything from the stock 18" tire size, which is 235/50R18 (27.25196 inch diameter). We all know tire sizes can vary, but I didn't have any solid info on the actual diameter so I went by the size.
765 rev per mile yields a diameter of 26.36355. That's nearly an inch difference, and the reason for the differences in our calculated speeds. Where did you get your information? |
I don't, and am sure others don't, have the software to open the spreadsheet on my computer.
I just use this calculator: http://www.f-body.org/gears/ Easy to use and you can make all the changes you like to it. |
Originally Posted by Ltngdrvr
(Post 5879120)
I don't, and am sure others don't, have the software to open the spreadsheet on my computer.
I just use this calculator: http://www.f-body.org/gears/ Easy to use and you can make all the changes you like to it. |
Originally Posted by hawkeye18
(Post 5879258)
It's called OpenOffice. And, the 21st century. It's not OP's fault that people can't figure out how to use a computer for basic tasks.
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Originally Posted by Ltngdrvr
(Post 5879291)
Well mr. smartguy, just hoped to offer the less computer proficient among us an alternative.
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Originally Posted by hawkeye18
(Post 5879319)
I'm sorry, but this is like *****ing at a guy who brings you a gallon of milk because you don't have a fridge in your house. It's 2010, you should have some method of viewing spreadsheets on your computer, especially if you're a car guy (because you might need to, oh, look at gear/speed charts).
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Originally Posted by coffeejolts
(Post 5879110)
It all depends upon what you believe is the correct tire diameter / revolutions per mile. I calculated everything from the stock 18" tire size, which is 235/50R18 (27.25196 inch diameter). We all know tire sizes can vary, but I didn't have any solid info on the actual diameter so I went by the size.
765 rev per mile yields a diameter of 26.36355. That's nearly an inch difference, and the reason for the differences in our calculated speeds. Where did you get your information? Pirelli's site has 761.9 revs/mile. I've been through this discussion with Gene....believe he's got it down pretty good! |
So you used unloaded diameter as opposed to loaded radius or revolutions per mile? That likely would explain the difference.
The listed rpm varies for several tires. I believe the OEM Ford 235/50R18 is 765 rpm (I believe the generic is 762 rpm). However the 763 rpm Summer Tire is for the 255/40R19 XL OEM MB Tire. Ive seen the Ford OEM listed as being 763 rpm / 769 rpm / 769.5 rpm in various places. Im not sure which is acccurate. I simply used the one that gave the closest to your numbers. |
I hear others saying that 1st gear is much less usable with 3.73 but this confirms that it shouldn't be an issue. I ordered it for but-o-meter in 2nd, 3rd, and 4th.
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Originally Posted by Gene K
(Post 5879958)
So you used unloaded diameter as opposed to loaded radius or revolutions per mile? That likely would explain the difference.
The listed rpm varies for several tires. I believe the OEM Ford 235/50R18 is 765 rpm (I believe the generic is 762 rpm). However the 763 rpm Summer Tire is for the 255/40R19 XL OEM MB Tire. Ive seen the Ford OEM listed as being 763 rpm / 769 rpm / 769.5 rpm in various places. Im not sure which is acccurate. I simply used the one that gave the closest to your numbers. My '11 theoretically should be turning 1823 RPM @ 75 MPH, but in reality it is closer to 2k. Doug |
Amazing that folks offer some good info, then get attacked for doing so. To coffeejolts, thanks for posting the info.
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Is it possible to use 5th gear on these and gain any time, or is it a loss between shifts? Just curious. I'm thinking 4.11 and using 5th.
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Originally Posted by AlsCobra
(Post 6202800)
Is it possible to use 5th gear on these and gain any time, or is it a loss between shifts? Just curious. I'm thinking 4.11 and using 5th.
What size tires are you currently running? |
Originally Posted by coffeejolts
(Post 5878987)
I have compiled a spreadsheet that details RPMS in each gear at a given speed for 3.31, 3.55, and 3.73 rear gears. There have been many posts recently asking which gears should I choose. This spreadsheet answers all of those questions.
Ignore the whiners who want to measure with a micrometer when the part is going to be cut with a chainsaw... :screwy: |
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
500 3 4 6 8 11 17 im lost in the first line, what does 3,4,6 etc mean? goes to 90 i have no idea what it is |
That is the mph in that gear at that rpm with that ratio.
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Do these numbers work for a 2013 GT with the 6 speed manual?
Joe C. |
The answer!
Originally Posted by coffeejolts
(Post 5878987)
I have compiled a spreadsheet that details RPMS in each gear at a given speed for 3.31, 3.55, and 3.73 rear gears. There have been many posts recently asking which gears should I choose. This spreadsheet answers all of those questions.
Bill |
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