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How do I retard spark timing to get burbles, crackle tune

EFI Tuning Fundamentals

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So, I been trying for many hours to make a burble map for my 09 G37 using Uprev ROM editor but I don’t know how I should do it exactly..

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Try using the ARC timing maps, the burn-time tables aren't the best for getting 'overrun'

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Thank you so much Chris, this really helps a lot.

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