Hi all!

I've tuned several cars running Megasquirt, Injepro, Tactrix, Hondata and so on.

When tuning ignition advance, I always sync the lamp with the ecu, then I tune my table/s. My real spark advance *always* is that I wrote on my tables, this way is (at least for me) the better way to tune a ignition table because I exactly know where to add timing (at cruising for example) or where to substract (at boost), and knowing HOW MUCH spark advance I'm using.

Ok, yes, I use timing corrections like retard by coolant temp or intake temp but no, please god no, I will no ever use a timing correction per RPM.

A few months ago, reading some spark tables from Neptune I've realized that they have a ridiculous low spark timing, then I've done some research and read about timing corrections.

I do not want to start a pointless thread or a flame war about timing corrections, I just wanna know.. Why should I use timing corrections?

Thank you guys!

 

This debate has gone on for years and why we generally frown upon sharing ignition values because most people do not understand table timing vs actual timing when comparing ignition advance (among other reasons). If you understand Dwell based RPM adjustment then by all means disable ignition adjustment and do it all manually on the table. For most tuners, its convenient to keep it enabled.

 

Great! Thanks for your reply Muckman.

 

To add to what Muckman said, most will tell you that it just adds time to the tune and time = money. There is no problem with removing the RPM advance, but chances are you will be adding it back in later on anyways on the main tables. Mechanical / Vacuum advance distributors ring a bell? Same concept but controlled electronically. In the end they are all just numbers and each engine will want something different.

 

word. in the end the motor will want X degrees no matter how you get there.

 

Thanks to this feature I've become pretty good at using Excel to determine slope

 

thank you guys!

Now I'm checking out some default tunes that there are in Neptune software. I've picked this boosted z6 tune and I want to know if I thinking in the right way:



If I pick uhm.. 198.3KPA (around 14 psi) and 7500 RPM then I have 16*, but I need to add ~9.25* from the correction tables, so where it says 16's I'm running at 25.25*, isn't?

Thanks!!



Hahahaha