wats a good af ratio? - SRT Forums

DannySRT405 · 09-23-2005, 01:02 AM

I just wanna kno wat a good af ratio would be, the mods are in my sig, minus the wga, thats still on backorder. right now in my lower rpms, like 2000-2700 its from like 12.8-12.2 then around 2800-5400 im anywhere from 11.7-11.1, and the rest of the way it goes to like 10.9. i have my safc settings so i can change the fuel map every 4000 rpms. the car feels fast now but i think it has more potential...any input on a good set af ratio would be appreciated. thanks guys

Kustomatix · 09-23-2005, 01:05 AM

11.5 - 12.2 Is what I like to tune safely at.

BACARDI_DWB · 09-23-2005, 01:17 AM

^^^^^^^^^what he said.. i am tuned at 12.2 thru the rpm until 6000 i drop off to 11.8

DannySRT405 · 09-23-2005, 01:40 AM

alright thanks for the help guys

DannySRT405 · 09-23-2005, 06:20 PM

another problem i seem to have is my a/f ratio in 2nd is a lot diff from my a/f in 3rd. idk if this is normal, i wouldnt think it is. and i still cant get my a/f ratio any higher then 11.0:1 at my higher rpms (5600+), how much should i take out with my afc? an also should my hi an lo throttle % be the same amount? im still learning the safc.

DannySRT405 · 09-24-2005, 06:09 PM

actually a ? i have is, should my hi and low throttle settings be the same?

sour kraut · 09-24-2005, 08:11 PM

Quote: Originally Posted by DannySRT405

actually a ? i have is, should my hi and low throttle settings be the same?

They can't be the same. You can set them 1% apart but not the same. If you set it like this it will act like an on/off switch. It will use the low map right up until you hit that percentage then switch to the high map. No interpolating inbetween. You should only set and tune it like this if you use the map as throttle input and have someway to take care of ptb. Also if you change your boost pressure often you will have problems. If tuned right, this works great, if tuned wrong, you'll have BIG problems.

DannySRT405 · 09-24-2005, 08:45 PM

so should i set the lo throttle settings at a lower % then the hi? cus now that i know this, this will really help me out.

sour kraut · 09-24-2005, 09:02 PM

Well, let's think about this for a second. Where do you want the low throttle to quit and wher do you want the high throttle to kick in, psi wise? I'm not sure where the sticky went, but figure out the psi to voltage and then figure out what percent that is to what you set as full throttle. Math sucks, I know, but it helps.

DannySRT405 · 09-25-2005, 03:51 PM

the thing is i dont kno how to read my voltage or w/e, im new to tuning, which is why i ask so many questions which are probably stupid questions to you guys, but i really wanna learn this. on my wideband, i have tghe tps, rpm, and af readout. i just wish i had someobody who could show me all this while tuning my car, much easier to learn that way. I do have the voltage vs afr conversion table if that helps.