speed in gears
#1
Bullitt Member
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Location: fredneck county, MD
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speed in gears
so I input the various ratios available for the 2 transmissions offered into a gearing/mph calculator to give an idea of the speed@1000 rpm.
pick your motor, trans., tire size and ratio to see what rpm's you will be turning at any given speed.
MUSTANG GT
235/50/18 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.31 1000 7 10 14 19 24 38
3.55 1000 6 9 14 17 23 35
3.73 1000 6 9 13 16 22 33
245/45/19 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.31 1000 7 10 15 19 25 38
3.55 1000 6 10 14 18 23 36
3.73 1000 6 9 13 17 22 34
255/40/19 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.31 1000 7 10 14 18 24 37
3.55 1000 6 9 13 17 23 35
3.73 1000 6 9 13 16 22 33
235/50/18 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.15 1000 6 11 17 23 30 37
3.31 1000 6 10 16 21 28 35
245/45/19 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.15 1000 6 11 17 23 30 38
3.31 1000 6 11 16 22 29 36
Given the 7000 rpm redline:
MANUAL TRANS cars will cross the 1/4 mile in 4th gear.
AUTO TRANS cars will cross the 1/4 mile in 3rd gear unless it can exceed a 112mph trap speed.
MUSTANG V-6
215/65/17 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 13 20 27 35 44
235/50/18 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 13 20 26 34 43
3.31 1000 6 10 16 21 28 35
225/60/17 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 12 18 24 30 43
3.31 1000 6 10 15 20 25 35
235/50/18 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 12 18 24 30 42
3.31 1000 6 10 15 20 24 35
All the V-6 cars should cross the 1/4 mile in 3rd gear unless it can exceed a 105mph trap speed.
pick your motor, trans., tire size and ratio to see what rpm's you will be turning at any given speed.
MUSTANG GT
235/50/18 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.31 1000 7 10 14 19 24 38
3.55 1000 6 9 14 17 23 35
3.73 1000 6 9 13 16 22 33
245/45/19 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.31 1000 7 10 15 19 25 38
3.55 1000 6 10 14 18 23 36
3.73 1000 6 9 13 17 22 34
255/40/19 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.31 1000 7 10 14 18 24 37
3.55 1000 6 9 13 17 23 35
3.73 1000 6 9 13 16 22 33
235/50/18 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.15 1000 6 11 17 23 30 37
3.31 1000 6 10 16 21 28 35
245/45/19 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
3.15 1000 6 11 17 23 30 38
3.31 1000 6 11 16 22 29 36
Given the 7000 rpm redline:
MANUAL TRANS cars will cross the 1/4 mile in 4th gear.
AUTO TRANS cars will cross the 1/4 mile in 3rd gear unless it can exceed a 112mph trap speed.
MUSTANG V-6
215/65/17 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 13 20 27 35 44
235/50/18 tires
AT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 13 20 26 34 43
3.31 1000 6 10 16 21 28 35
225/60/17 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 12 18 24 30 43
3.31 1000 6 10 15 20 25 35
235/50/18 tires
MT ratio rpm 1st 2nd 3rd 4th 5th 6th
2.73 1000 7 12 18 24 30 42
3.31 1000 6 10 15 20 24 35
All the V-6 cars should cross the 1/4 mile in 3rd gear unless it can exceed a 105mph trap speed.
#2
Tasca Super Boss 429 Member
Join Date: November 14, 2007
Location: Pacific NW USA
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Exactly why I would go with 4.56 or 4.88 rear end gears if I bought an '11 GT Automatic. I had already done the math and I'd want to go through the traps in 5th (closest gear to a 1:1 ratio) to use as much torque multiplication as possible. 4.88 gears would allow for trap speeds of nearly 115 mph in 5th, which is more than enough for a stock '11 GT Automatic, IMO. Maybe 4.56's if I thought I'd be adding a blower later on.
#5
GTR Member
Here is a really slick speed/rpm calculator. Plug in all the gear ratios, tire size and top RPM and it gives you the speed in each gear by RPM in 100 RPM incriments.
http://www.f-body.org/gears/
6R80/6R60 gear ratios
1st: 4.17, 2nd: 2.34, 3rd: 1.52, 4th: 1.14, 5th: 0.86, 6th: 0.69
MT82:
_______V6 / V8
1st: 4.236 / 3.66
2nd: 2.538 / 2.43
3rd: 1.665 / 1.69
4th: 1.238 / 1.32
5th: 1.00 / 1.00
6th: 0.70 / 0.65
Plug the numbers into the calculator and it will surprise you!
_______
http://www.f-body.org/gears/
6R80/6R60 gear ratios
1st: 4.17, 2nd: 2.34, 3rd: 1.52, 4th: 1.14, 5th: 0.86, 6th: 0.69
MT82:
_______V6 / V8
1st: 4.236 / 3.66
2nd: 2.538 / 2.43
3rd: 1.665 / 1.69
4th: 1.238 / 1.32
5th: 1.00 / 1.00
6th: 0.70 / 0.65
Plug the numbers into the calculator and it will surprise you!
_______
#6
GTR Member
These are the numbers I like to look at, top speed in each gear at 7000. Never mind sixth though, it'll never pull 7K in 6th.
7000 - 1st: 49, 2nd: 74, 3rd: 107, 4th: 136, 5th: 180, 6th: 277
Think it'll make 180 in fifth???
7000 - 1st: 49, 2nd: 74, 3rd: 107, 4th: 136, 5th: 180, 6th: 277
Think it'll make 180 in fifth???
#7
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Join Date: January 30, 2004
Location: Flint, MI
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A friend of mine said they had a mule (production variant) at 140 in sixth gear at half throttle... Now, I've done redneck math before, but I can't get there from here.
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