Muscle Mustangs & Fast FordsNews & Views
All the Specs on This 900HP 5.2L Ford
One of the rarest modified engines we've seen lately is this Mustang Shelby GT350 engine, which was topped with a black-on-black centrifugal supercharger. As Ford enthusiasts know, the GT350 engine isn't a 5.0L Coyote engine, it's a flat-plane crank 5.2L that's capable of 8,000-rpm engine speeds. In stock form, Motor Trend tested the 526hp 2017 GT350R at 12.2 at 119 mph in the quarter-mile. That's pretty quick, but if you're Michael Ayers from Chico, California, that's not quick enough.
To turn the wick up on the GT350 engine, Mike turned to Steve Ellis at Paramount Speed in Chico. Steve knew the 11:1 engine was pretty stout in naturally aspirated trim, so the only way to increase power would be to add boost and set the car to run on E85 fuel. To boost the torque on this high-rpm engine, Steve overdrove the blower hard, then uses a Turbosmart wastegate and boost controller to regulate the boost levels, depending on the engine's rpm and gear. The end result of this innovative thinking was a huge boost in performance, as the GT350R ran a 10.82 at a massive 137 mph, making it currently the quickest and fastest supercharged GT350, as far as we know.
The 5.2L engine is more stock than you might think. Steve added new oil-pump gears, a crank sprocket from Texas Speed Syndicate, Shelby Mike's timing-chain tensioners, and an Innovators West balancer that's part of the supercharger kit. For a while, they spun it to 9,000 rpm, but had to keep tightening the crank pulley, so they settled on a safer 8,300-rpm shift point.
The supercharger is a self-contained (no oil lines) P-1 from ProCharger, set to run at slightly over the maximum recommended compressor speed. The engine is so efficient that the intercooled setup only makes around 7 psi of boost at peak engine speeds.
It's hard to see, but there's a Turbosmart wastegate hidden in the intake tract. The wastegate and an electronic boost controller allow Steve to modulate boost without changing pulley sizes for a variety of track conditions and situations.
GT350s come with a twin-pump setup from the factory, so all Steve needed was a JMS FuelMAX fuel-pump voltage booster that increases voltage to the pump to deliver the increased volume of fuel for the switch to E85. They installed bigger 1,000cc fuel injectors from Injector Dynamics to feed this thirsty Ford.
The road-raceinspired Mustang needed some modification to launch at the dragstrip without wheelhop, so Steve added a BMR rear cradle, vertical links, and a set of 305-series Mickey Thompson drag radials. The factory clutch also hated the newfound power, so a Spec Racing twin disc picks up the slack and makes sure all the Shelby's power gets to the ground.