![]() ![]() The boost gauge.and hopefully it is a vacuum/boost gauge.is ALWAYS tapped in at the intake manifold. It is a VERY bad idea to tap in for wastegate actuator at the intake manifold.explanation is above. It is an either/or as far as where to tap in for wastegate actuator: at the comp housing or at the pipe frpm the IC to the TB. AND the boost gauge DOES read manifold vacuum as well as boost. And you adjust the boost by adjusting the rod length based on the reading of your accurate boost gauge that IS tapped in at the intake manifold. ![]() That is not necessarily the same boost # value if the signal came from the pipe between the IC and the TB, but so what? That is why the actuator has an adjustable rod. If you tap the wastegate actuator hose at the compressor housing, the actuator sees boost: the boost at the compressor outlet. Actually, there is not a "could get a boost spike" factor: it is more of a "you will ABSOLUTELY GUARAND#MTEED get a boost spike if you tap the wastegate actuator signal in at the intake manifold. The wastegate actuator would read that as "not enough boost/no boost" and slam shut the wastegate to raise the boost. ![]() In such a situation, when you release the gas pedal, the throttle valve closes, and the boost signal in the intake manifold disappears-you immediately go from a boost signal to a vacuum signal. I would also strongly caution AGAINST tapping for the wastegate actuator signal at the intake manifold: you could get one HELLUVA boost spike if, while under boost, you suddenly take your foot OFF the gas pedal. I would suggest tapping in for the wastegate boost signal after the IC, and BEFORE the TB. ![]()
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March 2023
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