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back ground knock adjustment

Practical Reflash Tuning

Relevant Module: Worked Examples > COBB - Subaru > Step 5: Optimising the Tune

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how do you fix the knock problem from forged pistons and rods. I'm picking up a lot of background noise from the knock sensors in the lower rpm levels and its pulling -5.0 degrees of timing. I'm using cobb software and have the option for adjusting back ground noise as a smoothing factor but struggling on the direction to adjust it.

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