Hondata

I'm trying to figure out what's changed in "Accord-14-2-US-AT-Tuned" v.s. it's factory counterpart.

By copying the ignition table of "Accord-14-2-US-AT-Tuned" onto "Accord-14-US-AT", I can see the differences---the high load side numbers are advanced. I also noticed that the "knock limit" table hasn't changed.

Does this mean that you guys dyno tuned the car and found a better ignition timing? Can you tell me what octane fuel I should use in order to use the tune without knocking? Thanks.

You can just open two instances of FlashPro Manager and load the two different tunes to compare.

Sorry I guess I confused you. The question wasn't really about where the difference is. It was about why are they different and how the numbers are obtained.

Basically I can see that the right side of the table was increased (advanced timing in high load). But my question was just how are those changes made. Are they from dyno tuning, and with what kind of fuel? If I'm going to use this tune, do I need to put a certain grade of gas?

As comparison, I put the factory and the tuned ignition tables below:

They were all dyno tuned. I do not believe anything but the recommended fuel was used.

That looks awesome. The recommended fuel was 87 octane. So it seems Honda didn't squeeze the last bit out of their engines. The engine with stock ignition does produce a crying noise when it reaches that area ;)

As a beginner, I'm planning to use stock car in with 91 octane fuel. Which tune do you recommend I use? I see the one labeled Accord-14-US-AT-AEMCAI adjusted more of the ignition tables. Can I use that tune without changing the hardware?

You will have to try and see what works best in your case.

Okay. By comparing with the stock tune, I found that Accord-14-US-AT-AEMCAI tune has some changes in "AFM flow" and "Fuel high", but it seems I haven't access to the data of these items. I'm afraid using this tune with stock car could harm it, so I'd better make sure it's safe to do so.