After being the first to tune the 2018 Dodge Challenger SRT Demon with the Diablosport software, Joshua Schwartz of High Horse Performance went back to work on the supercharged Mopar monster – this time adding a smaller supercharger pulley. As you might expect, the results are very impressive, with HHP getting nearly 900 horsepower and 850 lb-ft of torque at the wheels from the pullied-and-tuned 2018 Demon.

HHP and the Demon

Last week, we featured the footage of the first 2018 Challenger Demon being tuned with the Diablosport software. That video came to us from Joshua Schwartz from High Horse Performance, who has tuned many of the quickest, fastest and strongest Hellcat cars, so it comes as little surprise that he is on the forefront of the Demon tuning.

In that video from HHP, the stock Demon made 788 horsepower and 702 lb-ft of torque at the rear wheels in stock form and when Schwartz removed the catalytic convertors, filled the tank with Q16 racing fuel and tuned the engine, the output climbed to 849 horsepower and 762 lb-ft of torque (again, all numbers discussed here are at the rear wheels). So by removing the cats, shifting to the oxygenated race gas and tuning the PCM, HHP picked up 61 horsepower and 60 lb-ft of torque over stock.

Pulley Swap

This time, HHP has added a Metco 2.75 supercharger pulley and tuned the setup for Q16. For just a pulley swap, the numbers are impressive, climbing to 890 horsepower and 847 lb-ft of torque based on the uncorrected number. The numbers discussed above were also uncorrected, so based on that measurement, the pullied Demon improved by 41 horsepower and 85 lb-ft of torque.


Now, since the “social media dyno police” will be quick to demand corrected numbers, we have those as well! The Standard corrected numbers for this catless, pullied and Q16-tuned Demon are 913 horsepower and 869 lb-ft of torque and the SAE corrected numbers are 892 horsepower and 849 lb-ft of torque.

https://www.youtube.com/watch?v=bNgONMoTrbY