Background:
After swapping the turbine housing on the Mabotech M600 from 0.58 to 0.71 A/R, I conducted a boost onset test to see how the change affected boost onset.
Test Procedure:
The GTI is operated in third gear with the engine speed varying between 1,800 and 3,800 RPM, and the accelerator pedal is fully depressed while boost pressure builds. Once the boost pressure increases past 20 psi, the accelerator is released, and boost pressure is allowed to drop.
This procedure is repeated several times to allow for the generation of a boost onset curve.
Test Results:
The chart compares boost onset using each turbine housing with the Mabotech M600 turbocharger.
There is no significant difference in boost onset related to the change of turbine housings.
Conclusions:
Changing the Mabotech M600 turbine housing from a 0.58 A/R to 0.71 A/R housing did not significantly affect boost onset.