Well yes and no. There's debate whether the SAFC can hold changes vs the ecu trying to revert back. I think that's what you are mentioning.

But for WOT, the ecu doesn't have the ability to make changes. This is open loop and the ecu uses preprogramed ign/fuel tables using the maf and TB I believe. So in a way, a/f tuing is needed if your breathing mods can indeed make the engine run lean at wot situations. But for anything less than wot, the ecu should be able to trim the appropiate a/f using the o2s.

 

Right - I didn't mean open loop. I specifically meant closed loop. Do these things tap into the throttle position wire and have adjustable load sites or what?

 

sick sick numbers man im glad to see that....i was gonna run my 06 6mt for the first time at the track( and my first time ever) last sunday but someone drove my car and smacked it up. So maybe im gonna go in like 2 weeks. Just out of curiosity I see you have an auto...did you use manual mode or just D....manual mode im assuming.

 

As in engine load? No. Just rpm based. You can +/- fuel in % in diff rpm increments. It's not as sophisticated as Emanage/utec/ etc. But it's a step ahead of some of the crude a/f management for some of the sc packages. Don't some still use a fuel pressure regulator type adjustment?

 

Yeah, I meant engine load. Without parameterized engine load, an afc's "tune" will be static(I don't mean rpm based); meaning that it will be tinkering with maf signals under light throttle, half, full, clutch-in, etc.

And I assume you're referring to whatever the fmu is that comes with the vortech or procharger. I don't have any experience with that.

 

I'm not sure on that actually. The SAFC is just intercepting the maf signal and the ecu is manlipulating the a/f based on that. I think the safc is making the change on top of any load based changes being made. So if the ecu as run all it's calculations and spit out a xx%, the safc is taking that % and attaching a -/+ % on top. But the question is when you force the % too lean/rich, does the 02 sensor pick that up and try to fight your adjustment.

From what I read about one of the standalones, you are actually inputing in direct %s into a table. So in that sense, you are making the a/f static and non-adjustable. Unless that table is just a starting point in closed loop. ie.. ecu uses that % and if the 02 picks up something lean/rich, it will adjust from there. vs starting from a lean point and having to adjust rich.

Or I could be 100% wrong. haha

I'm really waiting to see what Cobb is going to come up with. The reflashing sounds exciting.

 

Nice work. Very consistent, you should enter some of the bracket races.

 

I was thinking about it, but i dont know where to sign up at...




Also, to all the guys talking about the AFC on my car i have no idea what any of you are talking about haha but i know it did help.

 

Nice runs! Out of all your mods, which one made the most difference?

 

I think i told everyone that i think my AFC made the biggest difference. Something was messed up in the engine and i was only dynoing 190 odd something HP they installed that and the guy got in there and was tuning it here and there and then i was putting 140 something HP. So if it wasnt for the AFC i would have been the slowest G out there....

 

i agree. i wouldnt use an afc.