sounds like you guys would like to be able to have alternate maps for when the clutch is down?

might code that in sometime

 

“Timing retard” refers to the number of degrees that ignition is delayed after the point that would have resulted in generating maximum power." And that point is 20 BTDC, and the timing have to be late if you want the fuel in manifold? How can it get there if you burn it? http://en.wikipedia.org/wiki/Ignition_timing

 

20 Atdc

 

sorry, 20atdc.. and antilag 35-45atdc http://en.wikipedia.org/wiki/Anti-Lag_System

 

Just a note, the ECU will only read -10º no matter how far you retard the ignition in the map. It seems that the numbers in your map are actually recognized and represent the actual amount of retard, but the logs will only show down to -10º.

Isn't -35 the limit in the map?

Bartil, I promise you that most of us that post here know how ignition timing works. Advanced ignition fires earlier, or BTDC, and retarded ignition fires later, or ATDC. A positive timing value in the map is advanced and a negative number in the map is retarded. It's quite simple.

 

Maybe the evos are somehow different than other cars ignition?? I'm not here to argue, but i dont understand it, if you read this http://en.wikipedia.org/wiki/Ignition_timing its totally different what you are saying, cos if its late it will detonate before ignition (knock), so why would the ecu retard it more if you get knock??

 

That would be pretty cool.

 

Wikipedia is nice and all but you cant take it all as gospel. on the timing map 0* is TDC, and the numbers in the table are how many degrees before TDC to spark. So a negative number would be sparking after TDC. The fuel should not be igniting before the spark unless something is wrong, so I dont understand why you think sparking later would cause pre-ignition or detonation. Sparking later would mean the pressure reached in the chamber is less, so less chance of knock

 

Thanks, i think i understand it now, but not totally sure

 

The basic aim of tuning is to create peak cylinder pressure at ~15º ATDC with optimum fuel mixture. Most cars hit peak cylinder pressure AFTER that 15º mark because of knock. Igniting the fuel earlier (timing advance) creates peak pressure earlier and therefore closer to the 15º mark. If the fuel can't take it, you get knock. So the ECU retards timing to create peak pressure later and therefore reducing knock.

Does that help?

Also, you are referring to pre-ignition which is very bad. Knock on our cars is usually caused by detonation and not pre-ignition. Detonation and pre-ignition are two different things ... see what Wikipedia says about those two and it might help explain.

EDIT :: Here is the article

 

So, when tuning you add more advance, the knock you get is pre-ignition, right? Is the 0 at timing tables around 14º?

 

You do add advance to make power because it creates peak pressure earlier.

Knock is detonation, not pre-ignition. Pre-ignition is when the fuel mixture ignites before the spark and the piston is trying to compress the expanding gas. This usually leads to catastrophic failure. Detonation is basically an exaggerated and uncontrolled burn scenario brought about by high cylinder temps or cylinder pressure and is not nearly as catastrophic.

0* in the table is 0*, or Top Dead Center.-5* in the table means the spark fires 5* AFTER TDC and +5* means it fires 5* BEFORE TDC.

 

DO IT DO IT

 

^^^ I 2nd that

 

It would really only need to be a 1d map I would think.

Just one cell for timing and one cell for fuel while on the two step.