The LM66 was bolted on and it laid down 726 rwhp and 671 rwtq, gains of 23 hp and 12 lb-ft. of torque. We also tested the LM72. According to LaRocca, it's for the guy who wants "a no-compromise throttle body as it flows more airflow than anything else on the market," stated LaRocca. The LM72 swelled output to 729 rwhp and 669 rwtq, but there is more to the story than those numbers.
The chassis dyno pulls were done on a hot and humid June day. Big Daddy Performance utilizes huge fans that blow on the engine and through the grill, but time was working against us for the LM72 runs. We let the car sit, but didn't use any ice in the cool-down process.
The L&M 66mm raised output by 23 rwhp and 12 rwtq. Peak numbers were 726 rwhp and 671 torq
It bolts on easily and can be installed in 20 minutes with the proper tools.
The LM62 is available as a direct bolt-on for 4.6L Three-Valve engines, flows 1,500 cfm, a
While the heat soak certainly hurt power, the amount gained with the L&M 72 managed to raise the horsepower and torque levels to a point past the Ford parameters, which caused the Mustang to throw a code. "Although the L&M throttle body by itself doesn't require any tuning changes," said Minkin, "the additional horsepower and torque might take the engine components or tune torque limit past their respective parameters, as was the situation in this case. A word of caution-you must be careful to know the power limits of all the components in your particular combination." But we are happy to report that both throttle bodies picked up power over the Cobra Jet throttle body, and driveability was smooth with a nice reaction to pedal movement and part-throttle cruising.
Those who are switching from an aftermarket throttle body to an L&M unit are required to have the ECU throttle controls returned to stock. All L&M twin-bore throttle bodies require the factory settings since it's designed as a no-tune stock replacement (with the exception of the torque limit in the tune, which must be modified for those wishing to exceed the factory rating). According to LaRocca, the LM66 will pick up anywhere from 30 to 50 rwhp on TVS-equipped GT500s, depending on the boost level. Cars with lower boost pick up in the 30-rwhp range, while higher boost combinations are closer to 50 rwhp.
L&M also offers a twin-bore 62mm (LM62) throttle body that is a direct bolt-on for 4.6L Three-Valve engines, and offers the same airflow enhancements and driveability gains. An adapter plate is available to fit the two Shelby-style throttle bodies on the 4.6L Three-Valve engine.
The LM72 was worth 26 rwhp and 10 rwtq over the Cobra Jet 65mm unit. The LM72 was a clear
Shown here is a comparison of the LM66 and the factory Shelby GT500 throttle body (twin 60
Special thanks to Mike Rozman (shown) and Dwayne Gutridge of Big Daddy Performance for the
A twin-bore 78mm (LM78) is also in the catalog and is designed specifically for Kenne Bell 2.8H and 3.6L superchargers. For those who still wish to add a single-blade throttle body, L&M will have released two single-bore units, the Super Single (147mm x 66mm) and the Ultimate Super Single (152mm x 72mm), by the time you read this.
Technology might be advancing, but the same basic principle of getting air into an engine remains consistent. The L&M throttle bodies offer high-flow, which translates into more power and no tune required.