A 76mm MAF tube is one modification that came to us on our test 'Stang. Since we upgraded fuel injectors to 42-lb/hr units, the original tube (on the right with its sampling tube calibrated for 24-lb/hr injectors) is replaced with the 76mm tube HP supplies, which has a sampling tube sized for the larger injectors. They adjust the airflow over the mass air sensor, changing signals sent to the EEC IV to calculate the engine's fuel requirement.
HP suggests you lose the strut-tower brace in order to make installing the discharge tube a lot easier.
Clint Anderson is our wiring specialist, and he handles extending the GT's mass air harness. With the turbo system, the mass air meter is incorporated into the cold-side plumbing and is relocated into the passenger-side fender.
A Novice's Guide to Turbocharging: Basically, the engine's spent exhaust gasses enter the turbo through the volute on the turbo housing and spin the turbine wheel. As the wheel spins, the compressor wheel-connected to turbine wheel via compressor shaft-also spins at wickedly high speed and draws in/compresses the incoming air charge. The air charge passes through an intercooler and shoots through a tube in the mass air into the throttle body. It's really that simple.
This Spal fan is another included feature of HP Performance's Fox-Mustang turbo system. This unit whips up a serious wind that will keep coolant temp in check. This is necessary for our kind of application, especially in SoCal.
This is the knob. Jimmy is fond of this Holman manual boost controller ($100 optional upgrade), which runs from a vacuum source in the intake manifold to the side of the wastegate. Once the wastegate is maxed at 9 psi, the controller overrides it, allowing those who want more power to crank it in. An electronic version of the same device is also available ($380). Ricardo's 'Stang will need more engine and a lot more transmission before it's ready to test one.
Here's a look at Ricardo's newly turbocharged 5.0. HP Performance does this system right, as everything fit well. True to the company's claim, there was no welding necessary, nor did we need to purchase any additional parts or hardware. HP says the system is designed around stock '86-'93 Mustang geometry. Aftermarket K-members may present alignment challenges with some of the tubes. The kit is complete, and it looks at home in the engine bay of this '92 Fox.