Miata Turbo Forum - Boost cars, acquire cats. - Do i need to run my coil on plug on switched power?

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- ECUs and Tuning (https://www.miataturbo.net/ecus-tuning-54/)

- - Do i need to run my coil on plug on switched power? (https://www.miataturbo.net/ecus-tuning-54/do-i-need-run-my-coil-plug-switched-power-82761/)

dannymo

01-20-2015 10:08 PM

Do i need to run my coil on plug on switched power?

Do i need to run my coil on plug on switched power? running from my megasquirt and wondering if the 12v power need to be a switched power feed.

Matt Cramer

01-21-2015 09:29 AM

Switched is definitely better.

JasonC SBB

01-21-2015 11:35 AM

If you run it on always-on 12V, there's a possibility that the coil drivers will "phantom power" the ECU through the coil outputs, leading to unpredictable behaviour.

Additionally, the circuitry of the coil packs will drain your battery.

dannymo

01-21-2015 01:47 PM

I figured it was a bad idea, but was not quite sure. Thank you for your help

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