safc tuning...

[What]

Out of curiousity for whomever... what is input voltage coming from the VAF? When is it maxed out, or is it?

Once the signal is maxed out you can no longer subtract or add to it and thus essentially move the load cell up/down in the fuel and timing maps of the ECU.

The SAFC (depending on your model) should have ability to show you input voltage for those who have one. I thought I recall the BPT we did being maxed out early...

[TURBO1G]

i know all those things and how the safc works, and what it does you guys misunderstood me

here is what i'm getting at:

so the stock injectors are about 230cc. I put the 460cc rx7 ones when the car was still na. Obviously, tuning safc for -50% would make up for the doubled amount of flow. agreed? I tuned my for -45% just to be on the safe side, but thats beyond hte point.

The fuel maps on the stock ecu are safe for na and although for a boosted application might be on the lean side, still fairly applicable as long as the amount of flow is still registered.

So does this mean that the safc ONLY comes into play after the turbo is off charts? In other words, while the amount of flow is still registered by the ecu the straight line condition of -45% is fine, and then after it goes off there is safc tuning required? From past experiences, na ecus usually support higher flow than stock (bpt on na ecus up to 10psi, ka24de ecus on 240sxs supporting up to about 7 psi) so does this mean for low boost application stock flow maps will manage it?

Ok i think i confused everyone including myself..... so i'll cut the crap.
does this make sense:

safc maps assuming beginning of spool up at 3K rpm, full boost at 5, 460cc injectors and 7 psi boost

1000 - 45%
2000 - 45%
3000 - 45%
4000 - 35%
5000 - 20%
6000 - 20%
7000 - 20%

there is difrent ways too hook up safc.do you have tps or stock bp throtle switch?
any way if you WOT, ecu goes in too preset maps.afc dont change full throtle maps.you can use afc to change maps on mid and low throtle and the use fuel preasure to compensate for fuel.

[D323]

there is difrent ways too hook up safc.do you have tps or stock bp throtle switch?
any way if you WOT, ecu goes in too preset maps.afc dont change full throtle maps.you can use afc to change maps on mid and low throtle and the use fuel preasure to compensate for fuel.

Wrong.

*sigh*. When will this myth die? Contrary to popular belief, our ECUs ARE NOT ever in full open loop control. The AFM and hotwire affect fuel and ignition maps at WOT. The AFM at WOT at low RPM is only half open, and opens to near full at redline. I've done a dozen dyno pulls tuning the AFM. The first time when I just installed the AFM, the car was running rich. We tightened the flapper door, leaning it out and I made best power. After we tuned the cam gears, I loosened the flapper door tension. We loosened it one click and did a pull. Got 2 more whp, since fuel requirements were higher from cam tuning. We loosened it another click and got another horsepower. 3whp from too clicks. Why? Because there are variables.

If our PCM was completely map based at WOT, then AFM adjustments wouldn't see any gains or losses. When I first installed my AFM and adjusted it so that it ran the smoothest, it was actually very rich. When I got on the dyno, I was down 7whp from my last dyno(from 114.9 to 107.5). We did successive pulls, tightening the flapper door each time, until we got 117.2whp. We also went one click tighter, but power went down. I left the shop with 10whp more than I came in with, because the AFM CAN be tuned.....it's actually a great tool....