02-24-2017, 10:22 PM
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#11 (permalink)
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A True Z Fanatic
Join Date: Oct 2014
Location: socal
Posts: 1,114
Drives: 370z
Rep Power: 13435
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great explanation. it is a quick metallic ping. it goes away as soon as she lift the throttle and re-accelerate fine within a second or two and runs well from there at any speed.
Again, the engine is quieter and smoother than my newer/lower mileage Z. And the exhaust also sounds much better, but that's a different discussion 
Our main concern is the long term effect of this issue. The ping normally last just 1 to 2 seconds at 1500 rpm or less.
Quote:
Originally Posted by Jhill
This is what I meant when I said most cars I have worked with (so that's not the z as I only have my own for comparison) but if they ping it is right at throttle tip in from cruise and is momentary. Typically this is in a part of the map with high ignition timing as they want good throttle response and max torque since you are trying to accelerate. Not every car does it even within the same type of car and climate and fuel quality play a roll (acura MDX were fairly picky since they are also heavy and use high comp ratio as well). As for long term damage, not being able to hear if yours is a light ping that instantly gets corrected or if it's bad knock and not correcting would make a big difference, the first one I personally have not seen one fail catastrophically by light ping that gets corrected quickly.
Again if you really want it gone I would go to Seb and he will actually tune it for 91 octane with two ign maps one for summer and one for winter (hot climate/cold climate).
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