Cold weather-my a/f leans out too

[-HIC-]

Why? If your MAF tune is working for you why would you change? If your MAF fails (very unlikely) you will be running SD anyway. If you think your VE table is off than just have it tuned on the dyno. I would make sure your MAF correction factors are nailed down, and you will be happier with a MAF tune. Unless of course you plan on doing some kind of FI, or you are maxing your MAF.

[farmtruc]

I've been running the av at 10 - 10.5 forever, just a little safer.
Finally got a good retune on it last night, running strong with this weather.

[DBTBSS]

I was just giving Allen crap. I'm basically SD tuned now to a certain point.... I have a mut tune. As soon as I can get all the nitrous stuff installed I will be getting dyno tuned. My TBSS hasn't moved in 3 weeks.

[farmtruc]

SD tunes are a lot more stable, easier to tune and from what I've researched/done on the dyno, make a little more power.
Everytime a heavy head and cam package car or truck comes in, I don't mess around with maf tuning anymore, we go straight to sd tuning.
It clears idle up immediately and runs so much smoother.

Plus, you're not fighting two tables during tuning. For example, during start up, you use the ve table, then in closed loop it's mainly the maf stuff.
Do this, for those running maf and have hptuners, turn the maf off or put the pcm in open loop, notice how far each table is off?
Instead of fighting two tables, with SD you only use the ve table, it's easy and makes more power in the end.

Let's do this HIC, since you have our tuning, setup a retune appt with me and we'll tune your truck in sd mode and you can see how nice it performs.
Or, we can do this over email since you have the tools to do so.
Yes, it does take a little longer and we end up adjusting it once or twice after it "settles down", but in the end you'll like it.
Plus, since you have hptuners, you can just go back to maf if you don't like it; no need to remove the maf during testing.
Now for forced induction, if the vehicle supports it and it takes sd more correctly, that's the only way to go.

let me know, but that's my reason on why to switch,
allen

[Quik]

i noticed this as well so i left my tune where its at. one part of day it was 70* later that night it was 40* that was killing the logs so i left thigns little on the rich side but used the meth at WOT to dial in the AFR. just back off the gain and it leans or turn the knob and richens the AFR


i shoot for 10.8-11.3 anything leaner i get worried

[-HIC-]

This could actually be a write up Allen. I am planning to change to a bigger cam in the next few weeks. After that ill have you hit me with an updated mail order maf tune. then I will make an appointment with you to do a dyno before, and then Dyno after with SD tuning. Sound Good? When it comes to tuning you know I trust your judgement, and I will never pass up a chance to learn something!

[-HIC-]

Actually right before I change cams I will get it dyno'ed and we can use that as part of the original numbers. Then I will change cams, come up there with the mail order - dyno > then go SD and get the final numbers and drivability. Sound good?