novice tuner here in need of a expert (cant find much when searching the web)

[tomass716]

So the vehicle is a 2010 Avalanche flex fuel motor LMG E85, trans 6L80. Mods are minor but enough to make my fuel trims all over. Motor has full headers, no cats , port polished intake/heads and throttle body, aftermarket intake. So far I have had the tuner for a week and love it, the parameters i changed already I have had a blast getting them dialed in. Messed with TM, spark mostly. My LTFT are all over. After familiarizing my self with Dialing in LTFT from many other post on these forums. I figured i would start and order the wide band o2 while it was on the way i would work on LTFT and worry about P.E. later. Used to race old 4 bolt main non EFI motors in my day. After reading and getting to understand V.E. I thought tuning this would be easy. Here is where my problem is , I can not find any primary V.E. tables with map kpa vs rpm any where. After doing some research online i guess the e85 flex fuel are a pain to tune ( at least what some have said). Can someone lead me in the right direction for getting LTFT dialed in , i though about starting with the MAF. Any help is much appreciated. Here is my current tune with everything fuel set to factory settings.

[HackAbuse]

You don't have VE on that vehicle, you have VVE. VVE has to be calculated via coefficients using the VVE Editor under the Edit Menu

[tomass716]

so when you edit this table and hit apply it changes the coefficients accordingly ? Thanks for the step in the right direction by the way

[schpenxel]

Yes.

But make sure you're applying the same changes to both the open and closed manifold switch options. That's a common mistake.

And for setting up the graph, if you haven't already:

http://www.hptuners.com/forum/showth...621#post416621

Short version on the process: Disable MAF, tune virtual VE. Switch to MAF only, tune MAF. Re-enable both, enjoy

Keep in mind you can only tune part throttle areas with fuel trims--WOT/PE areas you really need a wideband to tune. Not sure if you have one or not.

[tomass716]

Sweet, thank you gentlemen. I will be busy for the day now Yeah ordered the wide band and it should be here this week.

[tomass716]

Great step by step by the way, it almost made it to easy lol.

[HackAbuse]

Just pay special attention to failing the MAF and setting up filtering so DFCO doesnt skew readings etc

[tomass716]

Alright getting there but one more noob question. Should the open and closed manifold tables be identical ?

[HackAbuse]

Yes

[tomass716]

Awesome thanks again, Man this program is easy and user freindly. copy paste with multi %, click valley's and peaks, rinse repeat, boom tuned. Another quick question do you re enable DFCO when done or just keep it off? It sounds just fine when i let off the throttle but not sure if thats going to be the case when i re enable the MAF and tune that.

[HackAbuse]

Honestly it's up to you. Sometimes I leave it on, sometimes I leave it off. If DFCO is left off, it may cause the car to gurgle and pop on decel. Obv you'll pick up a minor amount of MPGs with it enabled