in that URL it says:redhardsupra said:SD all the way. we already covered this topic on this board and many other times on other boards. MAF has a limit and it's not descriptive enough to provide a safe tune for anything Forced Induction.
http://tuning.wikispaces.com/tuning+Forced+Induction is the shortest version, i can go much longer on this if you'd like
this post was about FI on LS2, so i gave my opinion in that context.Steel Chicken said:OK, but you are talking about some rare situations.
a lot of people, especially 'pros'Steel Chicken said:I always line up the SD tune via the VE tables before doing the MAF. I never do just the MAF and leave VE alone. Who does that?
yes, that's the method i 'invented' almost 2yrs ago, in the days when everyone was tossing their MAFs, i proved that MAFs are to be understood and calibrated, not feared and ignored. they have their place, just not on my carSteel Chicken said:No one here has suggested doing MAF only...only not to trash the MAF if it will work ok, ON TOP of a well done SD/VE tune. I mean you *have* to have the VE done right in SD mode to calibrate the MAF anyways...right? Whether you use MAF vs airflow or MAF vs LTFT for calibrating it.
and my experience is the opposite. i did 2 track days back to back to get a hype-less experience, one in SD one in MAF/SD and i like the SD better. no scientific methods, but i know that on the track my senses go superman, or i'd end up on the wall, that's why i'm willing to trust myself with that judgement.Steel Chicken said:My *personal* experience (admitedly limited to about 5 GTO's) is that a properly tuned VE and MAF means a very responsive car under all conditions. For me at least, an SD tune, while running great, doesn't seem to have the throttle response a SD+MAF tune does. Am I wrong here?
read my 'how speed density works' paper, it will explain how SD accounts for everything, in terms of formulas so there's no vague bullshit.Steel Chicken said:One other question you still haven't answered, how much of a difference does an SD tune only make when weather conditions change, and altitude changes? Here in Colorado people regularly go from 3K' to 10K'. A MAF/SD tune will respond to that very well....are you saying an SD-only tune will too?
I'd rather have it adapt quickly too, like when you shoot nitrous, i'd like IAT to instantly show me -100C, not slowly dribble down and by the time it's anywhere near real values, the run would be long done with.Steel Chicken said:I live @6k' feet, and my favorite road course track is near 3k'. Id feel much more comfortable knowing my PCM is gonna adapt quickly.
every single 'pro' tune i've seen does it.Steel Chicken said:You mention people "lying" with the IFR and PE and no one here is recommending that...that i've seen.
amen brother!Steel Chicken said:I strongly believe a solid SD/VE tune is the basis for the rest of the tuning process, and if the MAF is not overloaded/reversion-ized, I say keep it.
good, the harder you argue, the more formulas i'll find to fling back, and that's where the knowledge comes outSteel Chicken said:I'll repeat, i'm not trying to argue with you just because, i'm just trying to learn and I appreciate the efforts you are making to educate everyone.