I've noticed that a lot of u guys are using devices like the S-AFC II, V-AFC II and SMT-6/7 to tune ur engines for maximum na performance by controlling things like the a/f ratio and ignition timing.
My question is, which of those tuners can adjust a/f ratio AND ignition timing and which one(s) adjust only a/f ratio or timing? From what I understand, the SAFC and VAFC tune only the a/f ratio and the SMT-6/7 can do both. Is that right?
Also, what's the diff. b/w a stand alone engine management system and a piggy back style system? Is the only diff. b/w them the obvious fact that the stand alone system can make it's own custom designed fuel/ignition curves where the piggy back system can only modify the stock ECU curves up to a certain point?
What models are you guys using? I'm really tryin here guys and I've even checked out apex-i's website for more info, so please, no flamin ok?
Thanx to all who respond!

 

Please do a google search on each one and find out. Or just review the posts here. This is supposed to be an advanced discussion section. Keep it as such.

 

Okay you don't have $20 to search but you post this thread?

http://forums.maxima.org/showthread.php?t=415554