3500 RPM @ 70 MPH...is this right? - Mercedes-Benz Forum
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post #1 of 19 (permalink) Old 09-21-2008, 10:14 AM Thread Starter
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3500 RPM @ 70 MPH...is this right?

I can't tell if i'm shifting into 4th gear or not. Is this correct??

Joe T
'06 CLS 500 91K - Totalled
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post #2 of 19 (permalink) Old 09-21-2008, 10:40 AM
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Using one of many calculators on internet you should be doing 74.4 mph at 3500 RPM if you have 195/70 14 in tires.

However the calculaors don't take into account torque converter losses e.g. they calculate direct connection or other losses such as friction etc.. You also didn't mention your tire size.

Overall it sound right ....
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post #3 of 19 (permalink) Old 09-21-2008, 11:03 AM Thread Starter
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that is the tire size, thanks!

Joe T
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post #4 of 19 (permalink) Old 09-21-2008, 01:22 PM
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in my '85, I do a little better...3K @70mph. 195 70 14, but RE gearing is a little taller

1985 300D cali 190K


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post #5 of 19 (permalink) Old 09-21-2008, 01:24 PM
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im doing like 3200 at 60mph.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles


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post #6 of 19 (permalink) Old 09-21-2008, 02:11 PM
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kinda related, when I searched for gear ratios to post an answer. I found where the gear ratios on a 280E I assume that means 280CE also were different between series.

3,58: 230E, 280E (2. / 3. Series)
3,54: 280E (1. Serie)

How do you tell the series apart? what differ's from first to second to third.??
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post #7 of 19 (permalink) Old 09-21-2008, 03:01 PM
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Quote:
Originally Posted by cheapold280ce View Post
Using one of many calculators on internet you should be doing 74.4 mph at 3500 RPM if you have 195/70 14 in tires.

However the calculaors don't take into account torque converter losses e.g. they calculate direct connection or other losses such as friction etc.. You also didn't mention your tire size.

Overall it sound right ....
On an '84 300D, the final drive is 3.07. Where did you get that calculator? Mine is around 70mph at 3500rpm.


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post #8 of 19 (permalink) Old 09-21-2008, 03:35 PM
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Quote:
Originally Posted by karugs View Post
On an '84 300D, the final drive is 3.07. Where did you get that calculator? Mine is around 70mph at 3500rpm.

I googled something like gear ratio calculator I can't find it again and didn't tag it. heres another there are hundres out there.

Axle Ratio calculator

But like I mentioned before we don't have lockout torque converters and drag and friction are not taken into account.
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post #9 of 19 (permalink) Old 09-21-2008, 03:37 PM
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I found it.

Tire Size Calculator

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles


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post #10 of 19 (permalink) Old 09-21-2008, 03:46 PM
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SO I guess benz torque and friction losses are 16.44%
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