Fuel the Fire
Lethal Performance boosts the fuel flow of its S550 with a JMS FuelMax
By Steve Turner
Photos courtesy of Lethal Performance
Making power in a modern Mustang is the easy part. Supporting that power can be a challenge. However, when it comes to enhancing the output of the fuel system in the 2015 Mustang, there is an easy way to get the job done—a fuel pump voltage booster.
Knowing that big power was on the horizon from a progression of bolt-on hardware, nitrous injection, and, eventually, Whipple supercharging, Lethal Performance opted to maximize the factory fuel system with one of these units.
“The greatest advantage is, you can install supercharger or turbocharger systems and utilize the OEM fuel pump, eliminating the need to purchase costly multi-pump aftermarket fuel systems,” Brad Grissom of JMS Chip & Performance explained. “Aftermarket fuel systems can not only be costly, but also labor intensive to install. FuelMAX increases fuel pump output by as much as 85-percent, and requires considerably less labor and additional parts cost.”
Like many products, the early fuel pump boosters necessitated lots of wiring work, like cutting, splicing, and soldering. However, thanks to the new Plug & Play FuelMax Fuel Pump Voltage Boost (PN PM-2000-PPM15; $459) from JMS Chip & Performance, it doesn’t get much easier to install one of these units and ramp up your fuel pump’s output.
One reason the install is easier, is because the FuelMax is activated by the accelerator pedal.
“The accelerator pedal activation method is really the wave of the future for voltage boosters. This new method of activation reduces the installation time considerably, and provides an accurate and reliable method of controlling voltage increase,” Brad explained. “Voltage boosters are most commonly activated by a Hobbs switch, 0-5 volt signal, common ground, or boost pressure. This common method relies on other components and switches installed under the hood at the intake manifold. Activation via the accelerator pedal eliminates the need to run wiring harnesses through the firewall and install other components for safe and reliable operation.”
When the JMS FuelMax is engaged, it boosts the output enough to support up to 1,000 horsepower if you have the proper injectors installed. However, it doesn’t just instantly spike the voltage. You can set it for the desired amount of voltage boost and have it ramp in at the rate you desire.
“Other notable features are the ability to adjust the voltage ramp-in, ramp-out rate, and the amount of maximum voltage output. The built-in memory allows you to save the settings. Controlling voltage ramp-in and ramp-out rates is very important because it allows you to eliminate fuel spikes at the moment of activation or deactivation, which eliminates headaches when tuning and provides smooth and consistent fuel delivery,” Brad added. “Maximum voltage output is adjustable to allow only the voltage increase required for your horsepower level and fuel delivery requirements. The auto-save feature allows all of your settings to be saved to eliminate the potential of dangerous accidental changes by careless user.”
As we said, the JMS FuelMax for the 2015 Mustang offers a plug-and-play installation. That is thanks the harness provided in the kit. It plugs right in between the factory connectors and harnesses. However, to clarify the install for you, we followed along as the crew at Power by the Hour in Boynton Beach, Florida, added this unit to Lethal’s S550.