Quote:
Originally Posted by Joshboody
I don't have much tuning experience so, so to keep this a general tuning thread...
For timing maps, in general, can you scale the ingnition point based on just a couple part and WOT observations. Is a load / rpm table linear? Ie. 6000rpm compared to 5000 20% increase at same load? Same thing with load? How do you factor vtec, vvt, vanos , ect... I would think you'd have to take samples before and after the event.
I'm sure the timing table posted would explain much of this, but I don't have it handy now
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I think I understand your question... and if I do, yes, tuning is fairly "linear" per se. For instance, if two of your set points for example are 3000rpm and 3500rpm, and in the same load column, at 3000rpm under XXX load, you have a value of 14.5 degrees of timing, and then under the same load value at 3500rpm you have a timing value of 15.5 degrees, the ECU will "ramp" to that value per se. In other words, even though you do not have a set point at 3250rpm, at that RPM under the same load, the ECU will calculate your timing value to about 15.0 degrees. Does that make sense/answer your question?
It will work the same way when sliding between load values at a fixed RPM. A 3D image is a bit easier to understand, as it really does create a "map".
I've never played with Vanos, but I have played with AVCS and MIVEC (cam timing), and they have their own separate tables/separate from ignition timing tables. Honestly, I never invested too much time into cam/valve timing parameters, as I found that you can usually find a bit of lowend torque playing with them/decrease spool time just a bit, but for the most part I found most of them were pretty well tuned from the factory.
Haven't played with too many Honda's (very minor experience with some of the Hondata software), but VTEC typically has its own set point (separate adjustable parameter) that most people adjust at a set RPM. VTEC is just a simple extra lobe/rocker arm that adjusts lift/duration at a set point:
If/when the extra lift and duration increases load on the engine, the ignition timing map/table will be consulted in order to attempt to target the correct amount of timing advance.
I hope that helps.
