Bought 04 s55 looking for advice on tuning




I will keep it updated as I make progress
I will keep it updated as I make progress
1) Full Pan-Off Transmission Service - Identify and Correct Transmission Issue - Install New Transmission Mount
2) Oil Change and Brake Fluid Flush and Fill
3) Cooling System Flush and Fill - Install Bosch 010 Intercooler Pump
4) Install Crank Position Sensor
5) Supercharger Oil Change.
6) Good News No ABC Rodeo Necessary!
If you decide to move on the basics are done. A tune based on an 83mm Clutched Pulley shouldn't overwork anything and really does make a surprising difference. Race IQ for sure on the ECU tune and the MK Ultra TCU module can be purchased later if you want crisper shifts.
I installed the Black Series engine mounts,
which I got from FCP Euro.
The driver’s side engine mount I removed
was totally blown out, and leaking fluid.
The transmission mount was also shot.
So, be aware that fluid may leak out when removing the engine mounts.
I wasn’t wearing goggles but it’s a good idea.
Changing these mounts was well worth it, as the car is a lot smoother now. I also changed
the power steering rack bushings.
I will be changing the lower thrust arms, ball joints, lower spring control arms, inner and
outer tie rods, and boots soon. Then, align
it. I also will be removing the supercharger
and changing the gaskets, oil, and the fuel injector o-rings.
I’ve seen videos of people jacking up the engine using the oil pan when changing
engine mounts but I decided to use the transmission bell housing area instead.
If the oil pan got cracked, the car would be bricked, and there would be 8.5 qt. of oil,
all over the floor.
Other items to inspect/change are the water pump, thermostat, belt tensioners, pulleys, belts, temperature sensor, and hoses.
Here’s a picture of my S55.
to be removed, to get the supercharger off.
I bought an injector rehab kit which has Viton
o-rings, filters, and pintle caps. I also bought
an injector cleaner kit, to flush the injectors.
A new MAP sensor, and air temperature sensor
will also be installed.
I just need to rent or buy an engine hoist, to
remove/install the supercharger.
There’s no way that I’m going to take it on
and off without a hoist.
The Best of Mercedes & AMG
Hardened/dry rotted PCV hoses, belts and oil cooler seals are often overlooked. A spare crank sensor is good to keep in the car too.
+1 on the battery and 010 pump too.




FWIW, if you're planning to do valve covers, breather hoses and plugs, it probably wouldn't be a bad idea to do it all at the same time (although the valve covers are time consuming removing the old RTV from the breathers). Believe it or not but having the valve covers and coil packs out of the way does give you a little more room to get to the plugs and back to the crank sensor.
On a side note, there is a 3/16" or 1/4" vacuum hose underneath the driver's side surge tank that will give you a mystery vacuum leak if it comes unplugged. I found out the hard way with a high idle and error code. I finally hooked up a smoke machine to find where the hell the leak was coming from and that was it. I literally had to remove the surge tank to get to it because I couldn't get my hand under there, so it's not something you want to overlook.






