I was doing a pull the other day on the streets on a cold night and i was in the middle of fourth gear at 50% throttle boosting around 13.5lbs. I noticed my wideband was reading 13.4 and i instantly let off. Is this too lean to be boosting on? Normally i run 10.8-11.3. I have a built motor just wanted a little insight.

 

13.4:1 is definitely on the lean side, especially for a boosted car. You wanna make sure the o2 sensor on the wideband is still reading accurately.. or just get the car retuned.

 

and to add on that that 10.8-11.3 is WAY too rich. You are losing power, fouling out your plugs early, and just wasting gas doing that. Aim for 11.5-12.5

 

11.5-12 is a safe range

 

you say 50% throttle, but still lots of boost. so did you just lift, or were in the process of it??

 

if its at 13.5 in full throttle and boosting then i think you would have something to worry about....

 

that much boost at 50% throttle???
you running a t25??

 

thats fine at 1/2 throttle.. whats the afr at full throttle

 

At full throttle im at like 11.2 most of the time. But change in weather makes me run leaner up to 12.3 at times. I added more fuel today and did a couple of more pulls and got better. Im on 100 oct so not to worried, just didnt know what afr was pushing it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adseguy &raquo;</TD></TR><TR><TD CLASS="quote">Aim for 11.5-12.5</TD></TR></TABLE>

I aim for 12.0 to 12.5 at the track.