so this has came to my attention lately, i've never paid attention to my afr when im racing, so i never knew AFR increase as rpm increase. in 3rd and 4th when WOT at 3500rpm my afr shows 11.3 but it increase slowly, at 7000rpm the afr shows 12.3! is that normal? im running 23psi on 93octane right now. and yes i have walboro 255 and tuned

thanks for the help guys

 

what does afr mean??

 

air fuel ratio...

 

Atleast your air fuel ratio reads a number. My air fuel ratio reads lean stoich or rich only. I must of bought a cheap autometer one.

 

well thank you sir.

 

so as the rpm increases what does ur afr color turn to? i know theres green, yellow, orange and then red. at 7000rpm what color does it read?

 

i hope u guys are talking wideband here and not just for show inaccurate gauges

 

12.3 Is lean...u on meth or something? ...car needs to be tuned up top too...especially if your taking it well past 7000k

what are your other mods?

 

its an AEM o2wideband

 

i have an aem wideband also and that happens to me past 7000rpms it afrs start raise up at peak boost i hit 12.0 and at slowly decreases to 11.2 then starts to go up to 12.3 something like that but i think its normal cause there is less boost up top the less boost the less fuel the ecu dumps!

 

u think so? ic ic i got scared for a second. im running 23psi, but it spikes to 24.5psi for split second, u think that is a big issue? this is on 93pump. thanks a lot

 

are you tune?
to play it safe i would spike to 23psi on 93oct

 

thats a little much for pump. do u know how much boost ur making up top? and usually the mix gets fat up top not the other way.

 

afrs depend on a lot of things

 

yes im tuned, at 7000rpm i think the boost tapers down to 21.5 psi