Weird Ignition Table

Hi eveyone, I just got started tuning my car but found this really weird ignition table from my tuner. It seems like he retard the ignition timing to -10degree in these area across all VTC degree. I couldn't quite comprehend this, is it for knock control? Making the pop&bang sound?(It's not making that sound)

Any thought or idea?

Info. about my car:

K24A2 block

RBB-3 ported head

12.5 CR piston

Skunk2 Stage 3 tuner Cam&Valve kit

Skunk 2 Pro Series Intake manifold+Exhaust Header

Unless valves are kissing pistons there won't be any knocking at those engine speeds and loads.

It's basically zero throttle at high rpm. May increase the possibility of flames however between 0 and 10 atdc is probably the most reliable ignition angle at very low charge density so it may actually be to avoid misfires lighting charges in the exhaust.

Pops and bangs would usually be an ignition cut or mixed ignition/heavy retard ignition.

Sorry if I misunderstood — my English isn't perfect. Just to clarify, do you mean that in high RPM and low load situations, there's a higher risk of pre-ignition or misfire ("May increase the possibility of fames"?) due to the low charge density, and that's why he chose to delay the ignition timing slightly? Just want to make sure I’m following your explanation correctly.

There should be not risk if knock or pre-ignition.

High compression with string blow down will likely see very low charge density at high rpm off throttle so they may have run that timing to get more consistent ignition in the chamber if high advance doesn't consistently ignite, this would reduce the likelihood of full exhaust backfire events.

First step would be to ask your tuner.

If I had to guess, an attempt at pops and bangs... I'd honestly be worried about responsiveness though. Pulling all that timing even slightly off full vacuum could be noticeable if you are in that rpm range trying to pedal it. Overall, I have a feeling you aren't getting backfires or noticing the effect because the engine is never touching those cells. Quick shifts from redline would hardly touch that area. If it's on a road track on and off throttle, sure... but the street.. probably not.

Interested to hear what your tuner says.