Top Speeds in Different Gears (6MT)

Lug · 10-22-2009, 12:06 PM

Quote:

Originally Posted by G37Sam

Wrong again, you're arguing a different point than I am

What I'm trying to say

If you're @ 4k rpm on 4th doing say 100mph, you will do that irrespective of any other forces, for the rear wheels to do 100mph, your engine has to be at 4k rpm if in 4th, it's how the car's gearing has been setup. Air resistance aka drag force only affects how much TQ you'll need to get there i.e how much time I'll take you to get there, but once you're there, you will be doing 100 @ 4k rpm.

Take it easy guys I only said on the moon because I wanted to use the 0 air resistance factor, of course the cars won't move there lol

http://www.box.net/shared/static/6svnpj7so7.wav

cjof2003 · 10-23-2009, 02:55 PM

Code:

Forgive me if i'm wrong or off, as I don't know that much about the 370z, 
but with my napkin math, I get these results.

- 7500 redline
- 18" Rear Tire Size (non-sport): 245/45WR18
- 19" Rear Tire Size (sport): 275/35WR19
- 19" Rear Tire Size (Nismo): 285/35YR19
- Gear Ratios:
      6MT         7AT
1st:  3.794       4.924
2nd:  2.324       3.194
3rd:  1.624       2.043
4th:  1.271       1.412
5th:  1.000       1.000
6th:  0.794       0.862
7th:  N/A         0.771
FD:   3.692       3.357



Gear      6MT/6MT Sport      Nismo       7AT
1st               41mph      42mph     35mph
2nd               68mph      68mph     54mph
3rd               97mph      98mph     85mph
4th              124mph     125mph    122mph
5th              157mph     159mph    173mph
6th              198mph     200mph    200mph
7th                 N/A        N/A    230mph (229mph for sport)

kannibul · 10-23-2009, 03:32 PM

Quote:

Originally Posted by cjof2003

Code:

Forgive me if i'm wrong or off, as I don't know that much about the 370z, 
but with my napkin math, I get these results.

- 7500 redline
- 18" Rear Tire Size (non-sport): 245/45WR18
- 19" Rear Tire Size (sport): 275/35WR19
- 19" Rear Tire Size (Nismo): 285/35YR19
- Gear Ratios:
      6MT         7AT
1st:  3.794       4.924
2nd:  2.324       3.194
3rd:  1.624       2.043
4th:  1.271       1.412
5th:  1.000       1.000
6th:  0.794       0.862
7th:  N/A         0.771
FD:   3.692       3.357



Gear      6MT/6MT Sport      Nismo       7AT
1st               41mph      42mph     35mph
2nd               68mph      68mph     54mph
3rd               97mph      98mph     85mph
4th              124mph     125mph    122mph
5th              157mph     159mph    173mph
6th              198mph     200mph    200mph
7th                 N/A        N/A    230mph (229mph for sport)

Ha, I knew the 7AT was faster!

(ducks)

Also, it looks like we should be dyno'ing the car in 5th gear?

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