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Max ignition advance for N/A engines

Old 04-06-2018, 10:53 AM
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Default Max ignition advance for N/A engines

Whats up everyone? I have been searching around for timing numbers for a while and have seen mixed numbers so hopefully someone here can answer my questions.

I currently have a 1990 1.6 SNC running a Haltech Sprint 500 ecu. It does not have knock control so I haven't gone too crazy with timing. Car runs well, I eliminated the AFM and have a Cusco intake as well as headers, test pipe, and exhaust. Right now I'm at 28° of advance at 7000 RPM. I'd like to get an idea of the max timing that can be pulled without going past MBT or creating knock across all RPM ranges. I can always post the map I'm using (basically the regular haltech Miata base map with a few changes here and there)

Thanks for any help and input y'all can give me.
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Old 04-06-2018, 11:01 AM
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just a thought since all engines are NOT the same, an hour on a dyno would give real answers. Should be very easy to find a dyno in C.SC.

Run your map, add 2° across the map until you stop seeing significant improvement, then back off 2°.
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Old 04-06-2018, 11:03 AM
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at 27 you're about there on pump gas. 27-31* is what I tend to see depending on pump fuel quality
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Old 04-06-2018, 12:39 PM
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A spec Miata guy I talked to who owns a dyno uses 30 degrees at WOT for the upper RPM range, fwiw.
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