Lethal Performance fuels a 551-horsepower, stock-engine EcoBoost ’Stang
By Steve Turner
Photos by Steve Turner and courtesy of Lethal Performance
With all the excitement surrounding Lethal Performance’s new, 10-second Shelby GT350 project, you might have forgotten that the company is also developing a potent EcoBoost Mustang as well. In our last installment on the car, we covered the installation and testing of a Lethal/Rarefab turbo upgrade kit that raised the car’s output to over 427 horsepower at the wheels.
As impressive as that was, the car was teetering on the edge of what the stock direct-injection system can support. You can only take this system so far with bigger injectors and fuel pump voltage boosters. The next frontier is a true aftermarket pump upgrade. However, that has yet to come to fruition, so Lethal opted augment the factory fuel delivery with a secondary fuel system.
The company turned to Power by the Hour in Boynton Beach, Florida, for an auxiliary fuel system to feed Custom Performance Engineering’s FuelBar setup. This combination of an intake manifold spacer and a fuel rail allows for the installation of four additional fuel injectors in the factory air path. By plumbing this system to a custom tank in the trunk fitted with a Walbro 465-lph fuel pump the CP-E rail is able to support much higher levels of boost than the stock system alone.
“We decided to upgrade the fuel system as the stock system was pretty much tapped at the power level we were at before,” Lethal Performance’s Jared Rosen explained. “So by adding in the additional fuel rail, injectors and pump, we’re now able to support higher horsepower levels safely.”
To do so, the PBH team fitted the CP-E FuelBar (PN CPE-FDFB00001B; $713.44) with four 2013-2014 Shelby GT350 injectors controlled by a Microburst standalone EFI system that activates the extra injectors under boost. This extra fuel capacity allowed Lund Racing’s Ken Bjonnes to dial up a potent custom calibration that resulted in one of the most powerful stock-engine EcoBoost Mustangs around.
“I definitely wasn’t expecting to see 550-plus rear-wheel horsepower. That’s some serious power for a four-cylinder with the stock block,” Jared said. “I can’t wait to see this thing go down the track. Tens on a full-weight Performance Pack car with the factory motor and manual transmission seem like a pretty good goal to me. Let’s see if we can pull it off.”
That certainly does seem like a great goal, but it’s only one target on the path of this turbocharged Mustang. The Lethal crew has bigger plans for this combination.
“We’ve got a motor being built by Tim Eichorn at MPR Racing Engines. I’d say we can turn it up when we get it but we’ve already got it turned up,” Jared added. “I think it’s time to start looking at an even larger turbo.”