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  #1  
Old 01-05-2018, 04:59 AM
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W123 200e 1978 change final ratio

Hello everyone, my mercedes W123 2003 1978 94hp automatic has the final ratio 1:3,92.
driving at 100 km/h the engine rauns around 3400 rpm.
I want to change the final ratio using one of those final ratio:

- 3.69 from All 240D
-3.46 from All 300 non-turbo
- 3.07 from 300 turbo to 1984
- 2.88 from 300 turbo 85
- 3.69 from All 230 and 250

The car is driven 90% on highway and I don't know exactly witch one could be right for my mercedes.
Any suggestion please?

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  #2  
Old 01-05-2018, 09:52 AM
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Location: Miami Beach, Florida
Posts: 504
The lower the number, the more your acceleration suffers. I guess you already know this, right?
You'll save on fuel though.
__________________

1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT
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  #3  
Old 01-05-2018, 10:34 AM
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Hello Tomas, yes i know this. The only problem is: do you think is not too low to install a 3,07?
Actually when you drive around 100 km/h it seems to drive at 140/150km/h. I would like to make a longer ration to drive around 2800 Rpm when i run at 100km/h.
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  #4  
Old 01-05-2018, 11:31 AM
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Location: Modesto CA
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Quote:
Originally Posted by dmaglione View Post
Hello everyone, my mercedes W123 2003 1978 94hp automatic has the final ratio 1:3,92.
driving at 100 km/h the engine rauns around 3400 rpm.
I want to change the final ratio using one of those final ratio:

- 3.69 from All 240D
-3.46 from All 300 non-turbo
- 3.07 from 300 turbo to 1984
- 2.88 from 300 turbo 85
- 3.69 from All 230 and 250

The car is driven 90% on highway and I don't know exactly witch one could be right for my mercedes.
Any suggestion please?
dm:

Although you have indicated the type of use, terrain is important; where are you?

Your transmission likely starts in second gear (of four); manually selecting first would allow use of a 3.07 in an area devoid of hills. Otherwise opt for a 3.46 or 3.69.
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  #5  
Old 01-05-2018, 11:47 AM
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Hello Frank, thanks for the reply. Oh yes, I believe your suggestion is fully correct. Probably is better to install 3,46 to prevent problems starting in 1st.
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  #6  
Old 01-05-2018, 03:23 PM
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You might consider fitting the back wheels with taller tires--you should be able to reduce the effective ratio by 8% or so



Tim Kraakevik
kraakevik@voyager.net
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  #7  
Old 01-05-2018, 07:31 PM
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Location: CH
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Don't forget to change the speedo.
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  #8  
Old 01-08-2018, 05:39 AM
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Hot to changhe sppedo

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Originally Posted by Dr. Sternschnuppe View Post
Don't forget to change the speedo.
Hi Sterschuppe. How I should change the speedo? Shall I have to swap it with a new one or ther's a chance to trim it?

Thanks
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Old 01-09-2018, 10:15 AM
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Originally Posted by dmaglione View Post
Hi Sterschuppe. How I should change the speedo? Shall I have to swap it with a new one or ther's a chance to trim it?

Thanks
No, it is impossible to trimmed it.
You need another with corresponding K ratio.
Optimal way to resolve this problem is to buy diff and speedo from the same vehicle.
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  #10  
Old 01-10-2018, 09:01 AM
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Quote:
Originally Posted by Dr. Sternschnuppe View Post
No, it is impossible to trimmed it.
You need another with corresponding K ratio.
Optimal way to resolve this problem is to buy diff and speedo from the same vehicle.
Fantastic. Thanks a lot

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