Time for an awesome update!

Lots to say and little time. When I first plugged in the SRT-6 ECU it didn't go 100% as planned. First I had the SC clutch error and other little tidbits. Then I conquered the SC Clutch error with the resistor mod I performed. She was running fine but I was getting a sporadic Load limit error (common on modded mercedes from what I read looking for a solution, especially on the Kleeman kit). Partial load pulls resulted in the throttle plate slamming closed like I just dropped the motor through the floor.

I conquered that

Then I had the whole overwriting the developer settings to overcome. Through trial and error and lots of testing I settled that issue.

Then I started getting a couple of new errors; pressure sensor and a supercharger malfunction error.

So I collected lots of data, printed out logs and fault reports. Fried my brain looking at them and decided to take a break and develop my tuning tools and process.

I've had a spreadsheet that I built and used for years that I changed from working with the Toyota FCEdit to the AEM. Basically it is a calculator that accounts for the 21x17 map used by the AEM. It has 4 sections; Base Map, Desired AFR, Achieved AFR, Adjusted Map.

Paste your map, enter the achieved AFR per cell, cut and paste the adjusted map into your AEM tune.



I used to sit for hours mulling through logs in a program called Dataloglabs that provides a great way to manipulate data. I worked through the tune looking for areas with positive throttle input, increasing rpm, etc. I then zeroed in on intersections of RPM and PSI and entered the results in the Achieved AFR section.



So I decided to automate my system. I built a new spreadsheet with Excel 2010 that scans my 225,000+ line logs and dynamically maps the AFR average per cell based on a user definable Throttle Position, RPM window per cell, and PSI window.



So far it has been working great and helping me dial in the fuel in minutes versus hours per tune.

That out of the way, I turned my attention back to the nagging CELs and BAS/ESP errors I was getting with the SRT-6 ECU. Understandable due to the fact that my Rotrex SC doesn't have the exact same boost characteristics of the stock SC and the Mercedes ECU is a living, breathing ***!

It is amazing sometimes how you take a break from something and come back to it and the answer is right there in front of you. I guess I had been working towards the solution one step at a time so it didn't exactly happen over night. Then WHAM the result of hundreds of experiments culminated into an answer. I sat down at my computer, mapped out a plan that I thought would tell me if I was at least on the right track (fully expecting I would have to tweak things further one way or another), implemented and boom.

Six test drives later of 45 minutes or more and NO CELs OR BAS/ESP Lights, no stumbling, no jerking, just smooth sailing (although with lots of extra fuel). Each drive was with progressively deeper and longer pulls, and finally today FIVE WOT pulls in 3rd gear. All confirm that I am finally in the POWER TUNING PHASE and working towards my ultimate number!



My fuel is pretty rich for now but this graphs shows I was making 10 PSI at 4,500 RPM. Right on target to make my desired 12 -13! Next up, more pulls, and tweaking fuel of and spark to find the best combo for power in pursuit of my top end goal of 400+ BHP.