Lethal Performance fuels a 551-horsepower, stock-engine EcoBoost â€™Stang
By Steve Turner
Photos by Steve Turner and courtesy of Lethal Performance
With all the excitement surrounding Lethal Performanceâ€™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 carâ€™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, forÂ an auxiliary fuel system to feed Custom Performance Engineeringâ€™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.
â€œWe decided to upgrade the fuel system as the stock system was pretty much tapped at the power level we were at before,â€ Lethal Performanceâ€™s Jared Rosen explained. â€œSo by adding in the additional fuel rail, injectors and pump, weâ€™re now able to support higher horsepower levels safely.â€
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 Racingâ€™s Ken Bjonnes to dial up a potent custom calibration that resulted in one of the most powerful stock-engine EcoBoost Mustangs around.
â€œI definitely wasn’t expecting to see 550-plus rear-wheel horsepower. Thatâ€™s some serious power for a four-cylinder with the stock block,â€ Jared said. â€œI canâ€™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. Letâ€™s see if we can pull it off.â€
That certainly does seem like a great goal, but itâ€™s only one target on the path of this turbocharged Mustang. The Lethal crew has bigger plans for this combination.
â€œWeâ€™ve got a motor being built by Tim Eichorn at MPR Racing Engines. Iâ€™d say we can turn it up when we get it but we’ve already got it turned up,â€ Jared added. â€œI think itâ€™s time to start looking at an even larger turbo.â€