Differential Swap - Limp mode
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Super Member
Joined: Nov 2005
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From: Cold Snowy North
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Differential Swap - Limp mode
Will swapping the final drive/differential for a different ratio cause the transmission software to go into limp home home? (Or are the W210s pre-super nappy TCU/ECUs)
Member
Joined: Nov 2001
Posts: 204
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From: Ca
96 P993T, 00 E55, 09 SL63
Suppose that you changed the rear final ratio from 3.06 to 3.17 then you need to tell the TCU about that change. Otherwise the TCU will not recognize the change and think that the transmission is slipping hence the trigger of the limp mode.
Tuners with proper knowledge should be able to do this for you.
Tuners with proper knowledge should be able to do this for you.
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Joined: Oct 2024
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https://renntechmercedes.com/index.p...rom-fdr-detail
Newbie
Joined: Nov 2024
Posts: 11
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From: St.Marys, Georgia, Santa Ana Costa Rica
s210 E320 5.4/6 speed
not just TCU, the diff ratio is also coded in ECU. I just had to do this in one of my vehicles. The Launch 908 Pro will code the ECU.TCU in 2001 and up, I discovered this on accident when I was Helping set up LKQ Calibration company in Daytona Beach Years ago. Just plugged it into my S210 Wagon and started making changes. How i know it accepted the changes because I changed the engine coding from E55 to E55k and threw my car into limp mode, also Changed diff Ration in ECU from 3.07 stock to E55 2.88 again threw my car into limp home as soon as I accelerated.
