E55 swap
Thanks in advance
Last edited by GTibunny8v; Jul 13, 2017 at 11:54 AM.
Thanks in advance
I myself has done the RENNtech build.
If I didn't purchase all the RENNtech parts, I would have done this.
But for the prices of E55 today,
One has to ask if this swap is worth doing?
Last edited by winks911; Sep 26, 2016 at 03:36 PM. Reason: mistakes


Thanks in advance
I ended up getting a 60k mile S55 engine, harness, and ECU. Needed to swap oil pan and pump from the original engine. Also needed to swap a the wires to fit my front SAM, add the second wire for the alternator (the S55 used a 1 pin regulator and the C55 used a two pin. I used the stock alternator.), the S55 rear oxygen sensors are part of the body harness. Needed to remove the rear oxygen sensors from the C55 harness and retrofit it to the S55 harness. The biggest concern is the fuel system. The factory pump and regulator in the tank is good for 3.8bar with no easy way of upping the pressure to the 5.2bar the M113k needs, we are still sorting that out. Looks like a larger fuel pump and internally regulated fuel filter. The guys doing the swap came up with custom machined AN fittings for the oil cooler lines and a cooler installed in the passenger side of the bumper. Hoping to have everything done and running by the end of this week.
Last edited by GTibunny8v; Nov 20, 2016 at 08:00 PM.
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I ended up getting a 60k mile S55 engine, harness, and ECU. Needed to swap oil pan and pump from the original engine. Also needed to swap a the wires to fit my front SAM, add the second wire for the alternator (the S55 used a 1 pin regulator and the C55 used a two pin. I used the stock alternator.), the S55 rear oxygen sensors are part of the body harness. Needed to remove the rear oxygen sensors from the C55 harness and retrofit it to the S55 harness. The biggest concern is the fuel system. The factory pump and regulator in the tank is good for 3.8bar with no easy way of upping the pressure to the 5.2bar the M113k needs, we are still sorting that out. Looks like a larger fuel pump and internally regulated fuel filter. The guys doing the swap came up with custom machined AN fittings for the oil cooler lines and a cooler installed in the passenger side of the bumper. Hoping to have everything done and running by the end of this week.
Last edited by MrMustard; Nov 20, 2016 at 09:22 PM.
The Best of Mercedes & AMG
Last edited by GTibunny8v; Nov 21, 2016 at 07:46 AM.
Got the heat exchanger installed and pump mounted with a separate reservoir tank. Also had the custom AN oil cooler fittings for the engine and oil cooler installed. Got the fuel system finished also. Had to swap to an external fuel filter sender unit for the drivers side of the tank. Installed the walbro pump and used an Audi S6 fuel filter with an internal regulator to get the 80 psi of pressure the M113k uses. Still waiting on the Star in developer mode to get this thing running.
Last edited by GTibunny8v; Dec 3, 2016 at 04:19 PM.
I myself has done the RENNtech build.
If I didn't purchase all the RENNtech parts, I would have done this.
But for the prices of E55 today,
One has to ask if this swap is worth doing?

To answer yes the swap is worth it and strongly thinking about it!
Why ? The c55 is much smaller and nimbler than the e55 and also lighter
no reason why not to do it
Got the heat exchanger installed and pump mounted with a separate reservoir tank. Also had the custom AN oil cooler fittings for the engine and oil cooler installed. Got the fuel system finished also. Had to swap to an external fuel filter sender unit for the drivers side of the tank. Installed the walbro pump and used an Audi S6 fuel filter with an internal regulator to get the 80 psi of pressure the M113k uses. Still waiting on the Star in developer mode to get this thing running.









