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Originally Posted by mark houghton
+1. Why bother with knock detection if it doesn't include an active ignition retard?
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Couldn't agree more. If it cost $30 and took 5 minutes, then a blinky light as a tuning aid/warning light? Sure, whatever.
As the Bosch sensor itself costs more than that - I think that once you invest the time to install and calibrate something you might as well have it actively protecting the motor in real-time.
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There have been massive discussions on this topic - specifically on J&S Safeguard IIRC- and there still seems to be a divided acceptance on how well this works in aircooled engines.
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I've yet to see anyone saying "brand X didn't work for me" - for any value of "brand X".
If my Safeguard did nothing more than save me from a tank of bad gas, it just paid for itself 10 times over - yet it does so much more.