air fuel ratio..

[lucasoil4u]

im running a dsm 2g and i just put in a wideband air fuel ratio gauge. i have 2.0 16g walbro 255 and 560s and apexi neo. What should my air fuel ratio be so its safe. Thanks for the Help.:Flush:

[Shane@DBPerformance]

There isn't a guaranteed safe A/F ratio. Boost and ignition timing will still blow up your motor at a very safe A/F ratio. You need to monitor timing, knock, boost and A/F ratio and figure out what combination of each makes the best power. If you are running moderate boost like 15-18psi with a good FMIC, then might be able to run in the very low 11s or aroudn 11.0:1 on pump gas. If you are trying to push the boost or setup then you might have to run richer and still get knock. A fuel controller like an SAFC or Neo is going to have the side effect(usually unwanted on pump gas) of causing the car to run more and more ignition timing the farther negative you are in the airflow settings.

[lucasoil4u]

it is set at 10 but then it creeps to 17 or so ... how can i fix that?

[4g63tcrazy]

That's boost creep. You're never really gonna be able to get rid of it. When mine started creeping I just upgraded everything to run the boost that it creeped to. Then it just held that boost perfectly. So in you're case, 17psi.

[lucasoil4u]

there has got to be a way to get rid of it 99 percent

[4g63tcrazy]

Search boost creep and you'll come up with some ways to try to get rid of it. But you already have the mods to support 17psi, so why not just run 17?

[lucasoil4u]

Its not a steady 17 its 17 when it wants to be .

[Gravy]

Porting the 02 housing worked for me. Porting the 02 and matching the exhaust got rid of it for me, and will be doing it to my new manifolds and 02 housings for the 13g upgrade i'll be doing soon. VFAQ has a nice bit about doing it, but i'm sure you can find someone on here to do it for you if you don't want to. If i'm not mistaken i think the 2g's have the same 02 housing as the 1g's, can get a ported and dumped o2 housing on e-bay fairly cheap.

[lucasoil4u]

i had the dump tube originally but that gets old after a while. i got a LIPP o2 housing that is open with no divider in the o2 housing. Is anyone else running the LIPP? i wonder if that will help me out when i put it on or not.

[4g63tcrazy]

That should help out quite a bit. And you said you start at 10 and it creeps to 17. If you just set you're boost at 17, then you'll no longer get creep and hold 17psi solid. That is all I'm trying to say.