At DiabloSport, we are constantly innovating to generate the best performance tuning for the late model automotive market. A particular focus for us has been the late model Dodge muscle market due to the exciting things going on in that space. We opted to purchase a 2019 Dodge Challenger Hellcat Redeye for testing and development. Our team of engineers and calibrators instantly went to work on this 797 HP monster to see what our band of enthusiasts could do to make the Hellcat even more impressive while maintaining factory emissions.
We first set out with the goal of making a great set of tunes to optimize power and drivability. We know that with these supercharged Hemi motors and 8-speed automatic transmissions, there is a lot of power left on the table and shifting improvements to be made. On our 93 octane tune, the calibrators were able to add 54 HP and 42 LB-FT of Torque to the tires over the factory setup on tuning alone with no modifications to hard parts or emissions. That is a substantial gain over stock and it is the most power available from a pre-loaded tune on the market today.
After building great power on the dyno, the next step was to take the car to the track to see what kind of improvements our tuning provides. First, we had to install a tire and wheel setup worthy of the power we’re trying to transfer to the ground, so we hit up our friends at Mickey Thompson to get a set of their ET Street R drag radials paired with Weld SR71 bead-lock rears and Alumastar fronts. We also installed the Per4ormance Differential brace to keep the rear end together under hard launches under boost. Now that the car was ready to hit the track, we tested the car on stock tuning and it performed pretty consistently around a 10.91 ¼ mile at 125 MPH, which isn’t bad considering the hot conditions and high humidity. We loaded our 93 octane Diablo tune and see what the 54 HP improvement gained us. The car ran a 10.56 ¼ mile at 128 MPH with just DiabloSport tuning. This is a substantial improvement in a ¼ mile ET at almost a ½ second gain with such a small modification. We also feel that our tuning could do even better in optimal weather with a better density altitude.
Now that we’ve seen what we can do with just tuning, the next step was to add a smaller upper pulley and a custom tune from DiabloSport’s CMR custom tuning software. We went with a 2.75 upper pulley and upgraded the injectors to the Injector Dynamics 1050x setup. This was done primarily for future upgrades, as the pump gas tuning we were running did not necessitate an injector change. With the smaller pulley generating about 3 psi of boost over the factory setup, we were able to modify the tuning to bring the total rear wheel horsepower to 820 HP. That is almost 100 HP over stock with simple tuning and a smaller upper pulley with factory cats installed.
With over 800 HP to the tires, a track test was next. We went back to Orlando Speed World with the goal of getting in the 9’s on pump gas with emissions intact. The weather was definitely not perfect as it was in the 90’s at roughly 2500 DA. Our first pass on the improved tune with the smaller pulley got us a 10.2 at 130 MPH and that was so close to our goal that we knew we’d make it happen. On our 3rd pull, we hit a 9.92 at 132 MPH. We’re thrilled to see that with simple mods and expert tuning, you can get a Hellcat Redeye into the 9’s with emissions intact on pump gas alone.
We will be continuing with our modifications to do some testing on race fuel and E-85 to take this car to the limits of what can be accomplished without any emissions modifications. Stay tuned!
We're going to upgrade the fuel system using Earls plumbing to a system capable of handling any fuel choice we opt to try and see where the true limit is on this car on the track and the dyno with factory emissions.
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