Quote:
Originally Posted by Ramonesfreak2010
Is using a MSD RPM activated switch necessary? Or is it only if you are using a ROM tune? I am planning to use Haltech.
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RPM switch is only when running non VTC ECU S13 SR20 and others. S14/S15 ecu has a built-in switch that can be used to trigger the VVL. Your basically using what used to trigger the VTC solenoid to now the VVL solenoid. There are exception for S13 KA/SR ECU who choose to go Nismotronic it's custom firmware allow provisions for several input and output that can be used for VVL activation and others.
Overall since your going with Haltech which should have onboard RPM switching capabilities you wouldn't need an separate RPM switch.