Flashed my first SimosTools tune last night to my GTI! I've been EQT stage 2 ECU and TCU for ~4 years now and overall it's been pretty solid. It's also quite aggressive targeting ~28 psi peak boost on the IS20 at low RPM and I've been getting EPC lights and the P2563 code on track when the car is hot and can't make the boost it wants. So motivation to move to SimosTools is partially based on that and also that it's the vastly superior tuning solution. I uninstalled my Cobb AP from the ECU only and kept my EQT TCU tune on the car.
I basically copy pastad the tune from the
ECU Tuning Basics.docx and for a first flash it looks pretty good based on logging last night. Main things to clean up are small boost overshoot at spool and reduce timing a bit to clean up knock retard. Worst KR over 6 WOT pulls was -3.4. Here's a
datazap log - WOT 3rd into 4th for 3rd gear WOT continuing into 4th to ~6k RPM that I took during my trip to Mexico.
I've been addicted to Claude Code recently and over the past 3-4 days I built a python library that essentially does what TunerPro does, but programmatically so you can script a tune and produce modified .bin's that way instead of the manual process. I instructed Claude and it wrote all the code and I primarily used the Opus 4.8 model for the coding. I used this python tool to create the modified .bin after some back and forth getting it to understand how to implement the tuning basics guide. So my first tune and log here was created with that python library.
Now that the framework is in place I'm gonna keep playing around and add features. First is going to be analyzing logs and coming up with adjustments for wastegate, timing, etc. Plan is to make the tool open source and free on GitHub after some more testing and usage. Not sure if anyone has done something similar already, but it's been a fun learning process!
Cue Jack Nicholson Nodding.gif