Except for the fuel/air guideline ratio's, that is basically what Cobb is saying to fine tune. The gross tune does come from the fuel tables as I have both the stock one and the Cobb table to compare. No one seems to know (including Cobb as Calvin admits they are in a learning curve) or if someone does, are not willing to tell what is the best general AFR. Cars will vary and it's what that particular car likes best. (My Corvette liked around 13.3 to 1 - FYI, Pro Stock runs in the mid 14's - Forced induction in the 11's)
These cars appear to be different if that is the way to go as that is not what the tuners I'm used to dealing with do and certainly not what I've done in the past. (Yes, I'm an old Corvette, Chevy guy but owned a lot of imports also)
It used to be the first thing I did was either buy a larger Billet MAF or port the existing one. (More flow is better right?........ Only if it needs it Home!!) Found out later it made them harder to tune. The current trend among the people I talk to is to stay away from playing with the MAF, use stock tables as the only way to go.
Different strokes for different folks and what works.....works. An old dog can change his stripes. I'll read the guide as the software in it looks more like I'm used to as the Cobb software is certainly different. Certainly is a learning curve to all of this.
Thanks for the guide.
Quote:
Originally Posted by 1slow370
The target AFR is only supposed to be a guideline. It tells the ecu about where you want the AFR to be so it should be set around 12.5-12.8 and leaner down low near idle midrange. You change the MAF tables to tweak how the engine runs or the VE tables which it doesn't look like you have access to. Target AFR is there to tell the ecu when to start correcting itself. You need to change the air flow tables to make the ecu run right in the first place in order to give you the afr values you want. Both tables need to be changed in order to work together but the Target AFR table shouldn't have to be changed that much maybe a few points here and there.
Basic guide to nissan tunning
http://www.plmsdevelopments.com/file...ing_basics.pdf |