Mustang MonthlyHow To Engine
How to Keep a Shelby GT 500 Engine Cool - Keeping Your Cool
Excess heat is one of the few things that can hold back a GT 500, but Shelby Performance Parts has plenty of options for keeping heat soak at bay
Excess heat is the enemy of performance, and we've all seen the battlefield. Go to any race track and you'll witness signs of the struggle. We've all seen brake discs glowing like the surface of the sun as cars scrub off speed at a road course. Go to the pits at a drag strip and witness the racers balancing slowly melting bags of ice atop their intake manifolds.
More than one racer has been retired from competition by an overburdened cooling system, and few things are more frustrating than watching the race from the sidelines while your radiator pukes coolant like a college student at his first frat party. Fortunately, there are ways to keep crippling temperatures under control, especially for GT 500 owners.
Granted, in day-to-day driving, the GT 500 is a relatively cool customer. It's modern, fast, well-engineered, and, unlike a lot of big-block muscle cars from earlier times, will idle in traffic with air-conditioning set on Full Arctic with barely a twitch from the temperature gauge.
Go to the pits at a drag strip and witness the racers balancing slowly melting bags of ice atop their intake manifolds.
Most Shelby drivers, however, plan on more challenging driving than simply commuting between traffic lights. So when planning for track adventures with a GT 500, it's worth noting a couple of areas to watch. For one, the car is on the heavy side, which tends to stress braking systems. And two, even though the GT 500 comes from the factory with an intercooler, the 5.4-liter's supercharger generates considerable heat under hood.
This can be a problem because the GT 500s engine management is set on the conservative side, and once the supercharger starts spinning up some heat, the computer controls will pull back on the spark and timing. Ever take your GT 500 out for exercise and feel a noticeable drop in performance after, say, 15 or 20 minutes of driving versus when the car was first started?
That drag on performance is known as heat soak. "Heat soak is the enemy of a supercharged application," said Jer Gervasi, vice-president of Shelby Performance Parts. Fortunately, the Shelby parts division has a lot of weapons for battling the crippling effects of excess heat.
Most of the parts shown here come standard on the Shelby GT 500 Super Snake, but can be easily added to a standard GT 500, or even other Mustang variations. Some are easy DIY jobs, while others may require a more advanced automotive background for installation. Or, hey, you can always call up the Shelby Speed Shop and schedule an appointment to have it all done at the source.
Shelby GT 500 Extreme Duty Radiator
"The radiator and heat exchanger are the place to start for supercharged engines," said Gervasi. The Shelby GT 500 Extreme Duty Radiator (Z12-S7M-8005-C) was developed jointly by Shelby and C/R, and offers a unique core design and increased coolant capacity. The more coolant that circulates through the cooling system the better the heat dissipation spread across the increased volume. Under hard usage this radiator can reduce engine and cylinder head temperatures by up to 50 degrees, a significant performance edge. It utilizes the factory fan and condenser mounting locations.
Shelby Extreme Duty Coolant Reservoir Tanks
To keep a unified look under the hood when using the Extreme Duty Radiator, you can add SPP's Extreme Duty Coolant Reservoir Tanks (Z12-S11M-8080).
Shelby Extreme Duty Heat Exchanger
The cooler the air entering the engine the denser the air charge, allowing more fuel to be used in the mix. The result is more powerful combustion. Thus, the value of an intercooler and heat exchanger, which work together to cool the air before the engine drinks it in.
The GT 500 comes from the factory with an air-to-liquid intercooler with a single-pass heat exchanger. This SPP Extreme Duty Heat Exchanger (Z12-S5M-6K775-U) utilizes a proprietary NASCAR single-row core with a dual pass system—meaning the coolant flows a long and breezy path through the heat exchanger twice before returning to the intercooler. To make sure the heat gets pulled out of the fluid, the SPP heat exchanger employs two 709 cfm puller fans.
The Extreme Duty Heat Exchanger is one of the most potent weapons that can be employed against the frustrations of a heat-soaked GT 500 engine.
GT 500 Competition Intercooler Tank
Here's an easy one. The GT 500 comes from the factory with an air-to-liquid intercooler, although one with a modest 1.5 quart coolant capacity. The SPP GT500 Competition Intercooler Tank (S7M-8080-C) is a direct bolt-in replacement for the stock plastic tank, and increases capacity to nearly a gallon. Additionally, this aluminum tank has a fuel-cell style cap, making it easy to add ice or dry ice to keep your air intake temperatures as low as possible. There's also a drain nozzle so you can release water once the ice melts and add a fresh supply.
Transmission Cooler Scoop
Hard-charging open track activities demand that you keep the temperature of all components under control. The engine and brakes get most of the attention, but your manual transmission needs to avoid heat stroke as well. For that, Shelby Performance Parts has the Transmission Cooler Scoop for the '07-'14 GT 500 and '05-'14 Mustang with manual transmission.
The scoop diverts maximum airflow across the body of the transmission. It is similar to the one used by Ford on the Boss 302 Laguna Seca, although with one big difference—you don't have to remove the scoop to change the oil.
The "CS" logo cut into the scoop also means that if you take an unplanned trip into the gravel, the stones can drain out on their own without having to remove the scoop. The part (S5M-5025-UMT) is made from high quality steel, and is available either powder-coated Shelby Blue or with a natural finish.
Ever take your GT 500 out for exercise and feel a noticeable drop in performance after, say, 15 or 20 minutes of driving versus when the car was first started?
Shelby Front Brake Duct Kit
Obviously, the engine isn't the only part of the car that is affected by high heat. In track situations, overheated brakes will lead to a fall-off in performance. One way to keep your brakes gripping as intended is to replace the brake fluid regularly, ideally every year if you're a track regular. Over time, the heat-dissipation of brake fluid breaks down.
Another way to keep brake fade at bay is to direct cooler outside air over the calipers and rotors. Shelby Performance Parts has a Front Brake Duct Kit that will do exactly that for the '07-'09 GT 500. The kit (S6M-2004-B) fits stock Brembo, Shelby Pro and Shelby Extreme brake calipers. The aluminum backing plates are powder coated black and feature the "CS" logo. (The Front Brake Duct Kit also requires using the GT 500KR lower grille and lower grille bezels or the brake duct/driving light bezels for the Shelby GT; shown here.)
As part of Shelby American's move to new headquarters near the Las Vegas airport, Shelby Performance Parts will be expanding its role. "We're going to be doing more in-house research and development," said Gervasi. Among other things, look for new Shelby parts for Ford Focus and Raptor applications.