I just got done installing SLP LT's, catted X, Accufab 75mm TB and Plenum, and My AEM UEGO A/F Gauge. I also loaded my tune that was supposed to be for my car with the mods I have so far including those I just listed with the X-Cal. My air fuel is reading between 14.5 to 15.1. How dangerously lean am I and can I use my X-Cal somehow to add more fuel or do I need to send for a new tune and reload it. Thanks.

 

You can add fuel with the programmer but I Wouldn't. I would take it to a local tuner and let him dyno tune it for you. Around here where I stay it's only $100 an hour and I doubt it will take them an hour to do.

 

Do it yourself, youve got a good a/f gauge, thats all you need. Im assuming 14.5-15.1 is what you're getting at WOT? If thats what you're getting while driving around town then thats normal, but WOT runs shouldnt be any higher then 13.0.

 

The numbers I gave are at idle. I havent gone WOT yet because of where the A/F was. Im wondering if there is something wrong with the gauge. I should be able to pull my plugs and check if it is running that lean correct? The closest dyno is 2 hrs away. So I'm trying to avoid that. How do I use my X-cal to make adjustments. I have just loaded tunes so far with it. SO at idle 03gtmustang 14.5 - 15.2. that is normal? Thanks.

 

Thats a good a/f, you're fine. Itll be the same daily driving too.

You wont really be able to tell anything by pulling the plugs on pump gas.

 

Cool thanks fellas.

 

13.0 ??

 

for best n/a power 13:1 is best, its lean and mean but most people want 12.5:1 cause its a bit safer (this is for n/a motors).

 

is the AF guage you're using wideband? If not you'll never see anything but either super rich, super lean or stoich (14.6:1). EDIT: Nevermind this line.. your is a wideband according to AEM's site.

ernest... what exactly is your question? 13:1 is a good powerful AF for cars that exist where you can get 93 octane gas. Out here in Kalifornia we only have 91 octane CARB approved gas which sucks donkey *****. Thus here we use 12.5:1 as the WOT target for max power and safety.