max speed in gears auto
#2
Originally posted by Bopcat@July 18, 2005, 4:41 PM
Anyone know the max (redline) speed in each gear for a GT w/automatic tranny?
Anyone know the max (redline) speed in each gear for a GT w/automatic tranny?
#3
Originally posted by don_w@July 18, 2005, 5:05 PM
That would depend on a lot of things... don't think there is an answer for that.
That would depend on a lot of things... don't think there is an answer for that.
Wrong...there's a definite answer...it just takes a bit of calculation and I'm asking if anyone has found the numbers in a magazine or figured it out. Assume a 6250rpm redline, stock gearing and tire size.
Road & Track, etc. have listed the max speed in gears for manual tranny GTs but I haven't seen any numbers for autos.
#6
Originally posted by Bopcat@July 18, 2005, 6:10 PM
Wrong...there's a definite answer...
Wrong...there's a definite answer...
#7
Originally posted by Bopcat@July 18, 2005, 6:10 PM
Wrong...there's a definite answer...it just takes a bit of calculation and I'm asking if anyone has found the numbers in a magazine or figured it out. Assume a 6250rpm redline, stock gearing and tire size.
Road & Track, etc. have listed the max speed in gears for manual tranny GTs but I haven't seen any numbers for autos.
Wrong...there's a definite answer...it just takes a bit of calculation and I'm asking if anyone has found the numbers in a magazine or figured it out. Assume a 6250rpm redline, stock gearing and tire size.
Road & Track, etc. have listed the max speed in gears for manual tranny GTs but I haven't seen any numbers for autos.
Anyway, I don't know the numbers and haven't found them either. I'm curious as well. No need to talk about "variables, weather, different cars, etc..." he's looking for some numbers from a magazine, or numbers someone has seen on their actual car. Magazine numbers are sometimes based on the manufacturer claims as well...
#8
Well, if all your looking for is someone's best guess (like a magazine's), then you could probably assume the auto would be very similar to the manual. The slight loss of powertrain efficiency for the automatic, would likely be compensated by the higher rear end ratio (3.31 vs. 3.55).
#9
Originally posted by Bopcat@July 18, 2005, 7:10 PM
Wrong...there's a definite answer...it just takes a bit of calculation and I'm asking if anyone has found the numbers in a magazine or figured it out. Assume a 6250rpm redline, stock gearing and tire size.
Road & Track, etc. have listed the max speed in gears for manual tranny GTs but I haven't seen any numbers for autos.
Wrong...there's a definite answer...it just takes a bit of calculation and I'm asking if anyone has found the numbers in a magazine or figured it out. Assume a 6250rpm redline, stock gearing and tire size.
Road & Track, etc. have listed the max speed in gears for manual tranny GTs but I haven't seen any numbers for autos.
http://www.2mfffabshop.com/mycar.htm
let me know and I'll run the numbers and post the chart.
#10
Originally posted by 2MFF@July 18, 2005, 10:51 PM
I made a gear ratio calculator when I was planning my 6 speed swap in my 66 mustang. If you want a chart similar to this one
http://www.2mfffabshop.com/mycar.htm
let me know and I'll run the numbers and post the chart.
I made a gear ratio calculator when I was planning my 6 speed swap in my 66 mustang. If you want a chart similar to this one
http://www.2mfffabshop.com/mycar.htm
let me know and I'll run the numbers and post the chart.
Thanks, I'll look up the numbers and get back to you. I know how to do this by working it out one by one, but if you have a program that would be faster.
Obviously these are theoretical speeds in gears. The manual (and prob the auto as well) is electronically limited to 143. Lots of cars can't pull redline in top gear (or even the top two gears) because they are drag/hp limited. Our Miata will pull redline in fifth (118) but tops out at 122, which is a long from top gear redline because of its crappy aerodynamics.
#13
The link is broken for me. Anyone else able to get it to work?
#14
Originally posted by Bopcat@July 19, 2005, 10:41 PM
The link is broken for me. Anyone else able to get it to work?
The link is broken for me. Anyone else able to get it to work?
#15
Thanks, that's just what I was looking for.
I've done this once before with a different car. Took me all day doing it with a calculator.
Ben
#16
Kidding of course, thanks for the chart, good to know!
#17
Originally posted by Weedo@July 20, 2005, 9:07 AM
That's a great "best guess"!
Kidding of course, thanks for the chart, good to know!
That's a great "best guess"!
Kidding of course, thanks for the chart, good to know!
#18
Originally posted by don_w@July 20, 2005, 4:05 PM
Yep.. good to know... for what reason, I have no clue... but it is sure good to know. LOL
Yep.. good to know... for what reason, I have no clue... but it is sure good to know. LOL
#19
Bullitt Member
Peak Power for the V8 is at 5,750 RPM, and maximum upshift engine speed is 6,250 RPM
The rear axle ratio for the automatic is 3.31:1
Transmission Ratios: 1st = 3.22:1, 2nd = 2.29:1, 3rd = 1.54:1, 4th = 1:1, 5th = 0.71:1
If you care to calculate speed at RPM, here is how you do it:
Tire Diameter (stock) = (23.5 cm)(1/2.54 in/cm)(0.55)(2) + 17" = 27.18 in
Circumference = (3.14159)(27.18 in)(1/12 ft/in)(1/5,280 mile/ft) = 0.0013477 mile/rev
1st Gear Speed = (6,250 rev/min)(60 min/hr)(1/3.22 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 47 MPH
2nd Gear Speed = (6,250 rev/min)(60 min/hr)(1/2.29 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 67 MPH
3rd Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.54 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 99 MPH
4th Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.00 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 153 MPH
5th Gear Speed = (6,250 rev/min)(60 min/hr)(1/0.71 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 215 MPH
It would be advisable to be going down hill with a strong tail wind if you hope to hit the maximum speed in 5th gear.
Brian.
The rear axle ratio for the automatic is 3.31:1
Transmission Ratios: 1st = 3.22:1, 2nd = 2.29:1, 3rd = 1.54:1, 4th = 1:1, 5th = 0.71:1
If you care to calculate speed at RPM, here is how you do it:
Tire Diameter (stock) = (23.5 cm)(1/2.54 in/cm)(0.55)(2) + 17" = 27.18 in
Circumference = (3.14159)(27.18 in)(1/12 ft/in)(1/5,280 mile/ft) = 0.0013477 mile/rev
1st Gear Speed = (6,250 rev/min)(60 min/hr)(1/3.22 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 47 MPH
2nd Gear Speed = (6,250 rev/min)(60 min/hr)(1/2.29 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 67 MPH
3rd Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.54 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 99 MPH
4th Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.00 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 153 MPH
5th Gear Speed = (6,250 rev/min)(60 min/hr)(1/0.71 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 215 MPH
It would be advisable to be going down hill with a strong tail wind if you hope to hit the maximum speed in 5th gear.
Brian.
#20
Originally posted by Gearhead@July 20, 2005, 9:36 PM
Peak Power for the V8 is at 5,750 RPM, and maximum upshift engine speed is 6,250 RPM
The rear axle ratio for the automatic is 3.31:1
Transmission Ratios: 1st = 3.22:1, 2nd = 2.29:1, 3rd = 1.54:1, 4th = 1:1, 5th = 0.71:1
If you care to calculate speed at RPM, here is how you do it:
Tire Diameter (stock) = (23.5 cm)(1/2.54 in/cm)(0.55)(2) + 17" = 27.18 in
Circumference = (3.14159)(27.18 in)(1/12 ft/in)(1/5,280 mile/ft) = 0.0013477 mile/rev
1st Gear Speed = (6,250 rev/min)(60 min/hr)(1/3.22 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 47 MPH
2nd Gear Speed = (6,250 rev/min)(60 min/hr)(1/2.29 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 67 MPH
3rd Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.54 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 99 MPH
4th Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.00 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 153 MPH
5th Gear Speed = (6,250 rev/min)(60 min/hr)(1/0.71 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 215 MPH
It would be advisable to be going down hill with a strong tail wind if you hope to hit the maximum speed in 5th gear.
Brian.
Peak Power for the V8 is at 5,750 RPM, and maximum upshift engine speed is 6,250 RPM
The rear axle ratio for the automatic is 3.31:1
Transmission Ratios: 1st = 3.22:1, 2nd = 2.29:1, 3rd = 1.54:1, 4th = 1:1, 5th = 0.71:1
If you care to calculate speed at RPM, here is how you do it:
Tire Diameter (stock) = (23.5 cm)(1/2.54 in/cm)(0.55)(2) + 17" = 27.18 in
Circumference = (3.14159)(27.18 in)(1/12 ft/in)(1/5,280 mile/ft) = 0.0013477 mile/rev
1st Gear Speed = (6,250 rev/min)(60 min/hr)(1/3.22 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 47 MPH
2nd Gear Speed = (6,250 rev/min)(60 min/hr)(1/2.29 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 67 MPH
3rd Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.54 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 99 MPH
4th Gear Speed = (6,250 rev/min)(60 min/hr)(1/1.00 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 153 MPH
5th Gear Speed = (6,250 rev/min)(60 min/hr)(1/0.71 1st gear)(1/3.31 axle ratio)(0.0013477 mile/rev) = 215 MPH
It would be advisable to be going down hill with a strong tail wind if you hope to hit the maximum speed in 5th gear.
Brian.