Our 2015 Mustang EcoBoost "EcoStang" Project Car was a blast to drive right after it rolled off the truck, so naturally, we had to make it go even faster by adding a COBB 91 Octane OTS Tune via a 2015 Mustang EcoBoost COBB Accessport V3 Handheld Tuner and then getting our car on Dyno-Comp's AWD dyno to see what happened. The difference between the COBB tune and stock tune were pretty drastic, if not quite what we expected, so we decided to take things a step further by adding a 2015 Mustang EcoBoost Airaid SynthaFlow Cold Air Intake into the mix to see if could squeeze out any more performance and maybe take the edge out of our loss in peak horsepower. The good news is, that Airaid's intake did indeed get us exactly what we needed.
Once we got our baseline dyno out of the way, we let our 2015 Mustang EcoBoost cool down a bit before loading the COBB 91 octane OTS map. Once the tune finished its install, we got the rollers moving:
On our bone-stock dyno run, our car made 275RWHP and 290RWTQ. On run with the COBB 91 Octane OTS tune alone, our 2015 Mustang hit 250RWHP and 340RWTQ, which equates to about 287 horsepower and 391lb-ft of torque at the crankshaft. While we ended up losing a pretty hefty 25 peak horsepower, we gained a stout 50lb-ft of torque that also came in much earlier in the rev range. The early power is likely we lost peak power higher in the rpm range, due to heat soak that the stock intercooler and turbo system had trouble handling. Still, we were pretty happy having a ton more usable power down low, which is what our biggest issue was with the factory tuning.
The guys at Dyno-Comp waited for the car to cool down a bit before getting our Airaid intake installed. Once the temperatures were down, they threw the intake on and sent our car on another dyno run, which resulted in the following:
With the intake installed on our Mustang with the COBB OTS tune, our EcoStang Project car put down 260RWHP and 350RWTQ, which is more or less 299 horsepower and 402lb-ft of torque at the crankshaft, given a 15% drivetrain loss. Adding the intake picked up an additional 10RWHP and 10RWTQ with no adjustments to the tune. Not too shabby. While we still saw a drop in peak horsepower due to heat soak, it wasn't as bad with the tune alone. The likely reason is that while the intercooler and turbo were still getting heat soaked, the improved air charge managed to snag us some extra power over the factory air box.
