When the modifications get more serious, a bigger turbo is a must have to compliment even more fuel. With an upgrade turbocharger selected to compliment the extra fuel, smoke is drastically reduced, EGT’s are under control and, since the turbo is operating in a more efficient range, horsepower and drivability are enhanced. Under these conditions, the stock turbo is running on borrowed time. Under heavy acceleration, smoke is pouring from the tailpipe as the EGT’s and turbo speeds are climbing into the danger zone requiring a prudent driver to back off the accelerator pedal early to keep from damaging the engine. This can usually be seen on an engine with a performance chip (at the highest power setting) and maybe an intake or exhaust upgrade.
The lower efficiency means that more turbine power is required to reach the same boost causing higher back pressure in the exhaust manifold.
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