Originally Posted by nis350 (Post 3620204)

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.

Originally Posted by Jhill (Post 3619970)

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).

Originally Posted by Optimiser (Post 3620450)

I also experience this condition when everything has warmed up, exactly as described, taking off from a stop where I have been just sitting in traffic idling for a bit. I always wondered what it was and it was never tuned out, or couldn't be tuned out. :driving:

Originally Posted by PaulNYz (Post 3621045)

Have you ever had any issues from it?

Originally Posted by Jhill (Post 3620230)

Also may want to go to dealer and see if you pcm has the latest flash. It's not super common for the Japanese lines I have worked on to do a lot of re flashing like the German and GM to fix issues but there have been some and it doesn't hurt to ensure your running latest software.

Originally Posted by Optimiser (Post 3620450)

I also experience this condition when everything has warmed up, exactly as described, taking off from a stop where I have been just sitting in traffic idling for a bit. I always wondered what it was and it was never tuned out, or couldn't be tuned out. :driving:

Originally Posted by nis350 (Post 3621286)

at what mileage did this condition start?

our car started around 60k miles.... it was fine before that.

Originally Posted by Optimiser (Post 3623132)

As long as I can remember. Both when NA and now boosted.

Originally Posted by ZoomZ (Post 3623555)

What octane gas, NOT brand that is important. Run min. 92 for several tanks and see what happens.

What oil are you using? The VVEL requires the right oil. Go to Nissan and get the Ester oil if recommended by your owners manual. Otherwise, don't use a conventional oil, at the very least, try Mobil 1 5w30.

Originally Posted by Jhill (Post 3623556)

Original poster already said he is using 91 which is the highest you can get in CA without spending 6.00 a gallon for 101 or 110 I forget what is available at special stations.

Originally Posted by ZoomZ (Post 3623557)

Then oil is next. 91 should be fine.

Originally Posted by PaulNYz (Post 3623624)

Just out of curiosity, what would switching to ester do to get rid of the ping?

Originally Posted by PaulNYz (Post 3623624)

Just out of curiosity, what would switching to ester do to get rid of the ping?