Grim Tuning
Every Grim model, engine, and controller we can tune, 2020+.
Grim
2 supported vehicles via AutoTuner
Select Your Grim Model
Grim ECUs and TCUs
Grim tuning at Rapid Racing
We support 2 Grim vehicles across 2 models, covering model years 2020+, through AutoTuner. That includes diesel powertrains and 1 engine and transmission controller.
Each Grim tune is calibrated for your exact hardware and fuel, then verified with real data on our Dynojet 424xLC2 in Jenison, MI, serving Grand Rapids and West Michigan. Not sure which controller you have? Browse all supported ECUs or ask us.
Don't See Your Vehicle?
These lists cover off-the-shelf tuning platforms. We also do standalone ECU installs and custom calibrations, so reach out and we'll tell you what's possible for your build. Compatibility data last updated 2026-09-24.