You’ve been asking for more affordable options for our CT4-V Blackwing tuning, so we recently tested the JB4 tuner on a 2022 CT4-V Blackwing M6. We carefully and methodically experimented with all the various calibration maps and custom fuel bias settings to find the sweet spot on these cars. We’re happy to report that this product works, and works very well!
Four baseline dyno pulls varied from 399 to 407 whp. After the installation of the JB4 and our custom map, final numbers were 490 whp, for an impressive 83 whp boost in power! These are huge gains for a car with zero mods. However, due to the increased boost, we would recommend changing out your stock spark plugs for colder plugs with smaller gaps. And just as important as that, is to make sure that they are installed with plenty of dielectric grease in the coil boot ends.
The boost curve and powerband were very smooth and broad with the JB4 tuner. Fueling was identical to stock and there was zero electronic throttle closure and no codes were set in the several hours of dyno testing we completed. We’ve continued to work with JB4 on refining this product and have updated our White and Blue Belt Packages to include the JB4 instead of the DCM which has substantially lowered the package cost. Special thanks to Terry Burger for working with us to test, validate and fine tune his product, and Chuck for volunteering his beautiful Blackwing!
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