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? |
The lower the number, the more your acceleration suffers. I guess you already know this, right?
You'll save on fuel though. |
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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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. |
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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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 |
Don't forget to change the speedo.
:) |
Hot to changhe sppedo
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Thanks |
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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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