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Then my ecu will have a clean memory and can re-learn my fuel maps....? How incorrect is this?
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have you every watched the wideband on long steady throttle trips (cc), tps and mafs voltages stay steady as well as speed and rpm, the wideband will lean out. I've seen a steady 15.2 afr myself on 301. I believe this to be my long term trims kicking in.
So it won't learn the fuel map it will follow the fuel map and what 4x4le is saying is true the ecu will interpolate when you fall into the invisible cells via tp(cells read 28,32 but your in tp 29) tp load determines which cell to pull from. Im saying the longer you stay in the cells controlled by the ecu via the 02 sensor the more fuel is trimmed for max fuel efficiency. This won't help you make , more power on the dyno, but it will help you with that 10-15mpg thread.
what I mean by learning the sensor voltages is, not every person has the same stored voltages for mafs, and tps closed, this is apparent to me because, I've bought faulty oem z32 mafs based on this premise alone. Once the ecu learns the operating voltage the mafs work flawlessly. all i do is clear self learn. That's probably why isis mafs work for me a lil, lol.
The tps closed voltage can be tricky, unless you have nistune, conzult programs or software that can tell you when the tps is registering closed visually, most people miss it. Usually, i find it's accompanied by an 1100rpm idle, tps showing not closed @.45v.55v.60v(the sweet spot was .445v) but to get the range back I had to clear self learn.
so, apparently they just turn the "idle" down. The ecu hasn't learned to idle because it doesn't know when too. So after restart and warm up, (80c) the idle is still 1100rpm.
I hook up nistune and can see the flag not lit, the flag now says tps idle, it used to say tps closed IIRC.
If your looking for it?
Also I'd like to say some people are removing the coolant lines from the IACV, I recently used clearing self learn for this issue as well. The high uncontrollable idle issue.
The tune i referenced is based on 13psi, for a stock mafs and injectors, it usually nets 220-230 on a dynojet from the Midwest to the east cost.
mafs seems like it's the weak link in my records.
I love nistune should probably check for a new version soon. I'm stopping everything at 450hp or 400ft, WCF. I'm still internally stock minus studs and headgasket now. Nistune can be used on a stock setup, and is a better alternative for someone willing to learn to tune, has a nistune tuner local or used to rom tune.