what is the best air fuel mixture at wot, because mine is at 11.4 to 11.0 to rich or lean??

at cruzing speeds it reads 14.7 but soon as you go wot it drops to 13.5@4k then 12.6 5k and 11.4 to 11.0 at 6k to 6400

 

oh yeah the 02 sensors are reading 950 to 960

 

I always thought that 14.7 for N/A was ideal at cruise. And 13.0 at WOT. 11.0 is kinda rich.

 

That's about optimum but can be borderline pingable. For max effort I'd shoot for 12.8-13.0 at WOT N/A

 

kinda rich lol i allways throw codes 172 and 175 bank 1 and bank 2 too rich lol , but the new cam should lean me out some.

 

Thats a good question Ive been wondering the same thing and talking with people about that same thing. up high I think these engines like lots of timing and fuel thats something Ive noticed with tunes like nelsons and they perform well. My local tuner doest neccesarily agree and though I gained 10 hp from his tune it doesnt perform time wise as well as nelsons did. And in the end its about going fast not racing on the dyno. If Im wrong im shore someone will correct me and hopefully farmtruck will jump in.
Im starting to get into this tuning thing and its a pain. I miss turning distributors and messing with screws on the side of a carberator my simple monkey brain could absorb that alot easier.

But from what Ive gathered that seems about right I would try and lean it a little at wot and see what happens.

 

mine's like:
-51.4 to -61.0

at cruzing speeds it reads 98.7 but soon as you go wot it drops to 88.5@4k then 92.6 5k

 

 

If your truck is naturally aspirated approx. 12.5-12.8:1 should give you best power at wot..
Approx .85 - .87 If you are using Lambda


If you are looking for a lean cruise "Best Fuel Mileage" 16.5:1 is a good start..
Approx 1.12 Lambda

 

if you only gained 10 hp from a tune then it needs to be tweeked. these engines run better with more timing. the dyno thing is a good tool to get may the most hp out of the truck but i firmly believe that the vehicle will need to be driven and tuned for better results. i have seen nelson mail order tunes gain 20 to 25 hp.