Real ignition timing

[Razathorn]

Do the K series engines and ecus use some sort of ignition timing advance based on rpm that goes linearly up as engine speed increases, making the ignition values in the map not the actual ignition timing the motor is seeing, but more like 'advance over engine base ignition'?

[crackerjack]

I would think that you are refering to extrapolating?

doesn't the computer draws a straight line from one point to another(from one map to another) and extrapolate a number from it. If rpm is used then the straight line would be moving as revs goes up.

[Razathorn]

I would think that you are refering to extrapolating?

doesn't the computer draws a straight line from one point to another(from one map to another) and extrapolate a number from it. If rpm is used then the straight line would be moving as revs goes up.

You mean interpolation? No. I mean there is some hidden table in the honda ecu that says to use additional timing at 8k vs 2k that we are not aware of.

If you look at other engine management software for older honda engines, their ignition advances as engine speed increases, but systems based on honda ecus, the ignition stays pretty much flat. I'm suggesting there is a static advance based on rpm we dont' see.

I'm trying to get doug's opinion if this is indeed the case.

It really doesn't affect anything other that I wanna know ;)