As the title states, i noticed that my target AFR at idle is 14.1 or high 13s and is about the same just cruising around with light throttle. I started looking at this when I noticed my gas gauge going down faster than normal (last full tank got me 14.6 mpg, only 161 miles!). Now, I am new to FI but I promise I'm not speed racing around everywhere. I really don't get on it unless I'm merging onto or getting off of an interstate (nothing to warrant this type of mileage). Do you guys think it's something with my tune? I don't see why my target AFR at idle and while under light throttle is so low. Btw, my actuall AFRs are the same as the target, with a slight lag.

My setup FYI:

2002 with 110k miles
SOS Stage 2 with Novi 1200 oil fed
3.6 pulley pushing 14.9 psi
Race Heat Exhanger
AEM EMS V2
ID 1000s at 87% cycle duty at redline
Aeromotive 340
Okada Projects coils
Comptech 4-1 header
Asura 70mm hfc
Invidia v3 70mm cat back

Car made 372hp and 220tq at TopSpeed when it was 98 in their shop.

 

That number is fine. 14.8 is ideal however.

 

I idle between 14.5-15.5, cruise light throttle 14.5-15.5 up till like load point -5ish then richen to 12.3ish by 0. Then in boost anywhere 10.5-11.5

Hope that helps. U can def lean yours out.

 

^Thanks. That's exactly what I was looking for. I'll call TopSpeed Monday. They were able to fix my rev hanging issue pretty promptly over the Internet. Hopefully they can fix this too.

 

Im sorry if I missed it in the thread but what kind of gas are you on?

 

Believe it or not, 160 miles to a tank on 93. Not e85 lol

 

HUH.... Doug at topspeed set mine to the same settings roughly.... 13.8 or .9 is my target at idle and when i cruise its around 14.1 to 14.8 or so. I hwever have been getting around 26 mpg.
Maybe I coud lean mine out aswell and reap a little gas mileage....
Hmmmm

 

Turbochargers were originally created to increase engine efficiency. They use the available energy in the exhaust gases to increase power. I got >27mpg with my Greddy kit on the highway.

Superchargers use up a lot of power because the engine has to spin the blower mechanically. I'm only seeing 22-23mpg highway with my SOS kit.