We have found there is quite a bit of confusion regarding the procedures for adjusting air-cooled regulators. In an effort to clear this matter up following are the instructions for this procedure.
Adjusting Procedure for Air-Cooled Adjustable Wastegates:
Setting and adjustment must be confirmed upon installation of replacement air-cooled adjustable wastegates. They are pre-set at the factory, but require more accurate adjustment when installed and in operation. This procedure should only be performed after the fuel pressure and carburetors have been set.
GSI Engines: (Manifold pressure + Turbocharger reserve = 12” Hg)
The maximum desired boost of a GSI engine is 12” Hg. Therefore, the engine intake manifold pressure (measured at the intake manifold) plus the turbocharger reserve (measured across the throttle plates) should add up to 12”Hg. Once the wastegates are installed, start the engine, then bring to operating temperature and load.
• Measure the intake manifold pressure to establish the “boost” of the engine.
• Measure the differential pressure across the throttle plates to establish the “turbocharger reserve pressure”.
• The sum of these readings should be 12” Hg.
If the intake manifold pressure is 7” Hg, and the differential pressure across the throttle plates is 2” Hg, adjust the wastegate to achieve a differential pressure of 5” Hg. Note that the left-bank wastegate affects the right-bank pressure.
GL Engines: (Manifold pressure + Turbocharger reserve = 30” Hg)
The maximum desired boost of a GL engine is 30” Hg. The wastegate adjusting procedures are the same as the GSI, except the sum of the engine intake manifold pressure and the turbocharger reserve should add up to 30” Hg.
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