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Tuning problems

474 Views 5 Replies 3 Participants Last post by  SNK VNM
Hello everyone. I bought a 2017 Gt last year so I thought start with the basics I put a cold air intake and a custom tune at the local dyno shop. He must of ran it 25+ times on the dyno( over 3 visits) it keeps pulling 8 degrees of timing and can't figure out why. Has anyone heard of this?
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What happens when octane booster is added?
So 8 degrees is pulled with and without octane booster? Sounds like false knock if that's the case. I'd start checking the exhaust first. Any codes?
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