When I was dyno'd at ATP last week, My A/F's were at a pretty steady 15. I thought they were suppose to be closer to 12. Anybody have an idea to what may be causing this? All my mods are listed in my sig.

Anyone???

 

12.5-13 is optimal you seem to be running a bit lean

 

what kind of numbers did you put down?

 

quick askin everyone and dyno your weak sauce...maybe it will see track time one of these centuries

 

Thanks...but....Yeah I am assuming that I am lean because of the A/F's being so high, I am really looking for a teason that they are so high. I really don't think that my mods would even come close to taxing the fuel system, so my question remains...What could be causing this?

185.1HP/182.4lb. But my throughout my curves I have gained 5-10hp and 4-9lb over my stock numbers.

 

about the only fix would be to get a SAFC and tune it by adding and subtracting fuel to richin or lean it out

 

But there still must be something causing this to occur, like weak fuel pump, malfunctioning injectors, ECU error...something...I mean the car's stock system should be able to compenstate for the few extra hp that I have added. I mean there are people running 50shots without any fuel management and are doing just fine..

 

I dont know what to tell you...my buddies 02 6spd was bottoming 10 a/f and all he has is intake, exhaust,udp...no y pipe or anything.

 

you could get an adjustable fuel pressure regulator and control your air/fuel mixture a bit..

 

Seems lean to me, your mods are going to cause it to lean a wee bit, but not that much. Weak fuel pump or clogged filter maybe? A/F monitor wacked?.

12:1 is good for FI cars, N/A's should be 13-14:1 at WOT.

 

15 is kinda high... I have the same mods as you and same car essentially and my A/F was high 13's - 14 when I dyno'd... put down numbers similar to yours. Maybe get a fuel pressure gauge on there to see what kind of pressure you are getting... maybe try some fuel injector cleaner

 

Nauman,

I didnt know you dynoed those numbers. Damn I was a bit higher than you with the same mods as well as 19" wheels. Im starting not to believe this heavy wheels weight myth.

Dixit

 

yup.... I dyno'd with my 18's...