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I'm reading about fitting boost controllers, and consensus seems to be removing the TVSV system.
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On the ST205 the TVSV is a solenoid that is controlled by PWM
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There's some debate over whether it does this when knock is detected, but I can see this kind of control is desirable, and if the system fails, it reverts to a safe level of operation.
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Why has nobody used this TVSV valve as a ready-made boost controller? I understand it is able to bleed upto 0.5bar, so potentially enabling a max boost of 1.1bar.
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I'm thinking of cutting the TPC wire to the ECU, and using an Arduino to read the MAP signal and control the solenoid.
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I'm struggling to find any data sheet on the TVSV, but it seems like a simple PWM of the ground wire from the solenoid.
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Has anyone tried this before?