Mercedes-Benz Forum banner

1 - 17 of 17 Posts

·
Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
Joined
·
9,865 Posts
Discussion Starter #1
Gentlemen

My car has a 1996 SL600 power train, engine, 5sp trans, differential, wheels and tires. But I have no speedometer. So I need to know how fast is 2000 RPM in 5th gear.
 

·
Registered
00 SL500 SOLD, 05 SL600 Sport, 09 Silverado 4x4 LTZ,SOLD '15Silverado LTZ 6.2 8Speed John Deere 318
Joined
·
1,781 Posts
I'll go try mine and let you know a little later today.
 

·
Registered
2000 Obsidian Black Metallic Mercedes SL 320 V6
Joined
·
4,527 Posts
How comes you have no speedo Roncallo? I thought you could interface your stock R107 speedo with the drivetrain and so on...

Cheers.
 

·
Registered
Departed 1998 SL500 (and the Pano is in Bogota)
Joined
·
11,022 Posts
Instead of buying or fixing your speedo, get a GPS. It is more accurate too.
 

·
Registered
00 SL500 SOLD, 05 SL600 Sport, 09 Silverado 4x4 LTZ,SOLD '15Silverado LTZ 6.2 8Speed John Deere 318
Joined
·
1,781 Posts
In My '00 SL-500 2K= 63MPH on level ground under regular throttle!!!!
 

·
Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
Joined
·
9,865 Posts
Discussion Starter #6
How comes you have no speedo Roncallo? I thought you could interface your stock R107 speedo with the drivetrain and so on...

Cheers.
I don't have a speedo at the moment because the 722.6 transmission has no speed sensor. On the 129's ist's done with wheel speed. It may be possible to recondition the signal with a speedo signal changer but it may be too far out of range for adjustment. 48 tooth 129 wheel speed sensors vs 4 tooth 107 transmission output shaft sensors.
 

·
Administrator
1998 Pano SL500; 1993 SL500; 2005 ML270cdi
Joined
·
8,759 Posts
Could you utilise the VSS cable that goes to the radio ?
 

·
Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
Joined
·
9,865 Posts
Discussion Starter #8
In My '00 SL-500 2K= 63MPH on level ground under regular throttle!!!!
Seems very slow. I believe I'm much faster than that at 2000. Maybe my tach is off as well. What is your rear axle ratio and tire size. Maybe the 113 engine has different gearing in the trans. Anyone have data from a 96-98 SL600.
 

·
Registered
2000 Obsidian Black Metallic Mercedes SL 320 V6
Joined
·
4,527 Posts
Roncallo if you have a Pocket PC GPS capable device you can download a program called GPS speedo (LINK). It's free small and it works pretty good.

Cheers.
 

·
Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
Joined
·
9,865 Posts
Discussion Starter #10
My daughter has a cheep Garmin GPS I don't know if it has speed in it but I will take her out for a spin and see what I can do.
 

·
Registered
MB SL600, MB 380SE, Suzuki Grand Vitara, 38' Chris-Craft, Volvo V70XC, and my own two feet...
Joined
·
4,131 Posts
My car turns less than 3000rpm's at 100mph...

These things are geared way down. Final drive in the 600 seems different than the 500, I think it's geared down even further. But either way, these cars cruise effortlessly at high speeds and low RPM.
 

·
Registered
2000 Obsidian Black Metallic Mercedes SL 320 V6
Joined
·
4,527 Posts
My daughter has a cheep Garmin GPS I don't know if it has speed in it but I will take her out for a spin and see what I can do.
Well roncallo the Garmin should have speed to so you should be good.
Please let us know if it worked and how fast you are doing at 2000 rpm :)

Cheers.
 

·
Outstanding Contributor
1997 SL600 Brilliant Silver Sport with grey/dark metal interior, 234K miles
Joined
·
1,977 Posts
My 1997 SL600 runs 67 MPH @ 2000 RPM using the AMG sport rims and tires.
 

·
Premium Member
1986 560SL with M120 V12 Engine, 1988 560SL Stock
Joined
·
9,865 Posts
Discussion Starter #16
Well I finally got my daughters GPS out for a spin.

Using GPS

1500 RPM = 63 MPH
2000 RPM = 85 MPH

I seem to be reading less RPM at a given speed then everyone else. 2500RPM on this car would be 107 MPH. 3000 RPM would be 126 MPH. I'm using an engine trans rear end and wheels with stock tires from a 1996 SL600

My first thoughts are that I maybe needed a 12 cylinder tach but that would make my tach appear faster. Now I'm starting to believe that I need a 6 cyl tach. The M120 V-12 is essentially two 6 cylinder engines so they are probably putting out signal from only 1 side. This would put me in perfect agreement with drags1998. and within reasonable agreement with everyone else.

That means to get this right I will have to get a tach from a European 300SL produced between 1986 and 1989. Which is probably the same tach used in many US 6cyl cars.
 

·
Registered
Departed 1998 SL500 (and the Pano is in Bogota)
Joined
·
11,022 Posts
May be use one of those old dell/tach that keys off the sparkplug to check your tach on the dash.
 
1 - 17 of 17 Posts
Top