OBS 7.3 Powerstroke 1994-1997 Turbo Upgrades and Parts
One of the best ways to improve the performance and efficiency of the 1994-1997 engine is to increase the compressed airflow into the engine with more fuel. If this mix of air and fuel is not matched, poor performance and bad fuel economy are the result. Unburned fuel (black smoke) is wasted energy. This energy could be recovered for more power with an upgraded or larger turbocharger. In order to achieve this boost, the turbocharger uses the exhaust flow from the engine to spin a turbine, which in turn spins an air pump (compressor wheel). The turbine in the turbocharger spins at speeds of up to 150,000 rotations per minute (rpm) -- that's about 30 times faster than most car engines can go. Since the turbo is hooked up to the exhaust, the exhaust gas temperatures in the turbine are also very high. The engine needs about 18 times more air (by mass) than fuel to create smoke free optimal power. So adding fuel without more air in counterproductive in reaching your performance goals. Running the diesel engine with too much fuel (rich) and a lack of air raises exhaust gas temperatures and turbo backpressure causing engine failure or turbo failure. If you achieve a high boost number with a undersized turbo you fall out of the effeciency map of the turbo actually loosing power in the process.