Top speed in each gear for 7 speed
Thread Starter
Member
Joined: Feb 2009
Posts: 165
Likes: 4
2014 E350, 2015 ML350, 2017 X5
Top speed in each gear for 7 speed
Does anyone have info on this?
I couldn't find it any where.
Not that important for 5 - 7, but will be useful for 1 - 4 when using manual mode.
I couldn't find it any where.
Not that important for 5 - 7, but will be useful for 1 - 4 when using manual mode.
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,691
Likes: 143
W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
Super Member
Joined: Sep 2003
Posts: 783
Likes: 1
From: Murrieta, Southern California
Late Built 2005 W-211 E-320 CDI
Figure it for Yourself . .
Gear ratios for the 722.9 tranny are as follows:
4.377
2.859
1.921
1.368
1.00
0.82
0.728
Now all you need is the rear-end ratio and the number or revs per mile for your rear tires.
Get the tire revs per mile for your tire from the Tirerack site.
i e . . .
Fourth gear is 1.368 times 2.65 or whatever (?) your rear-end ratio is times
811 (225/55-16s) and we get 2940 revs per mile same as 60 mph
or 49 revs per one mile per hour equals 82 mph at 4000 rpm.
Simple no? Crawl under the back and read the rear-end ratio off the differential case.
While I'm at it, the gear ratios for the 722.6 are:
3.59
2.19
1.41
1.00
0.83
We see that the seven speed has two overdrives while the five speed has only one.
Advantage . . seven speed for crusing with that extra 10 percent overdrive.
Also the lower first gear.
Who says you cannot have your cake and eat it too?
DHG
MBWorld Fanatic!
Joined: Nov 2004
Posts: 1,691
Likes: 143
W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
Gear ratios for the 722.9 tranny are as follows:
4.377
2.859
1.921
1.368
1.00
0.82
0.728
Now all you need is the rear-end ratio and the number or revs per mile for your rear tires.
Get the tire revs per mile for your tire from the Tirerack site.
i e . . .
Fourth gear is 1.368 times 2.65 or whatever (?) your rear-end ratio is times
811 (225/55-16s) and we get 2940 revs per mile same as 60 mph
or 49 revs per one mile per hour equals 82 mph at 4000 rpm.
Simple no? Crawl under the back and read the rear-end ratio off the differential case.
While I'm at it, the gear ratios for the 722.6 are:
3.59
2.19
1.41
1.00
0.83
We see that the seven speed has two overdrives while the five speed has only one.
Advantage . . seven speed for crusing with that extra 10 percent overdrive.
Also the lower first gear.
Who says you cannot have your cake and eat it too?
DHG
The "." ".." "..." on the speedometer sure made it easier on the older models!
