Do these numbers look lean or about right?

RPM Air/Fuel
2400 14.7
2500 14.7
2600 14.8
2700 14.8
2800 14.7
2900 14.4
3000 14.1
3100 13.7
3200 13.4
3300 13.3
3400 13.2
3500 13.2
3600 13.0
3700 13.0
3800 12.9
3900 12.9
4000 12.8
4100 12.8
4200 12.8
4300 12.8
4400 12.8
4500 12.8
4600 12.8
4700 12.8
4800 12.7
4900 12.5
5000 12.5
5100 12.6

 

Look lean to me, but my tune is VERY safe and
very rich ...

 

In my opinion, definitely lean.

 

Holy shizznit that is WAY lean.....you better find out how much timing is in that program or your gonna go KABOOM!!!!!!!

I would say between 12-14 degrees advance is OK for that A/F, but even then you are pushing the edge.

Sure hope you got good plugs in there too.

--Joe

 

I run 10:1 at about 14 degree's timing on my street chip. You are way lean. Are you getting any pinging?

 

No pinging that I can hear. I thought the numbers were lean; I would like to see low to mid 11's at 5000.

 

This may be a stupid question, but if the numbers are lean, would'nt the computer throw a lean code--illuminating the check engine light?

 

That's pretty lean, unless you are running race fuel, and then it's still leaner than I'd do it.

It won't set a lean code. The PCM does not monitor the O2s at WOT. A lean code is set when the closed loop fuel trims have to add so much fuel that it hits it's maximum allowed limit, then it usually has to see that happen 3 times (not always though), then it will set a lean code.

 

Not only lean but don't you want to be richer on the bottom and lean it out as the rpm increase?

 

You will always be a little lean on tip in. Way too lean for me. What mods are you running? I would either pull the chip or if you are running extra boost drop it down until you can get a re-burn.

 

Thanks for the info fellas.