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The Garrett Automotive Group of Allied-Signal, Inc. has developed a new small turbocharger to meet a worldwide demand arising from the need for fuel efficient and low emission small engines for passenger cars and light trucks. This new turbocharger, designated the GT15, is smaller, lighter and lower in cost than Garrett's successful T2 turbocharger and is also designed to meet the more stringent durability requirements of the future.

A series of tests were run on a turbocharged gasoline powered vehicle to determine means of improving vehicle transient response through turbocharger design and installation modifications. Turbine inlet temperature, turbocharger rotating inertia, turbine housing flow characteristics, and turbine outlet pipe restrictions were found to have the most important effects on vehicle response. Turbine inlet pipe length and crossectional area had a large effect on turbine inlet temperature but had no significant effects on response if turbine inlet temperature was held constant.