AFR settings

Karl · Post by **Karl** » Sun Apr 16, 2006 1:00 pm

I understand that the engine should run at 14.7-1 at low engine loads and 12.5-1 at high loads. At what RPM and MAP pressure readings would you consider to be low load and what would be high load. Also what setting would you look for during the transition.

Thanks

Karl

Karl · Post by **Karl** » Mon Apr 17, 2006 4:03 pm

Any takers?

Please

MiseryQ · Post by **MiseryQ** » Mon Apr 17, 2006 4:35 pm

I'll bite. Keep in mind I'm no Expert at all (:

I consider the area I cruise low load.
High RPM, high MAP and the area I accelerate I consider high load.

Low load is 15.3:1.
High load is 12.5-12.1:1
Areas in between are just blended. Most of the table is 13.8:1 for no particular reason.

Karl · Post by **Karl** » Tue Apr 18, 2006 11:17 am

Thanks miseryQ, but I'm looking for a little more detail.

At what MAP do you consider high load?

At What RPM does it stop being cruise and start being high rpm.

MiseryQ · Post by **MiseryQ** » Tue Apr 18, 2006 6:40 pm

The reason I did'nt mention them is I figure each car will be different there. But...

-edit- it would be best just to show it.

fscott · Post by **fscott** » Tue Apr 18, 2006 7:52 pm

Thanks for the map. It makes things a lot clearer. I'd love to see one for a turbo engine to get the idea of how to map things above 100KPA.

What's the purpose of the lean settings at the bottom of the map? Are those for running lean of peak during cruise?

MiseryQ · Post by **MiseryQ** » Tue Apr 18, 2006 8:46 pm

That was supposed to be for saving gas during cruise, but it's not even in my cruise range :oops:
Now I remember If I lean out the table any higher on the KPA scale it will sometime overshoot and lean the mixture up to 16.5 where my engine loves to lean surge.

casper002 · Post by **casper002** » Wed Apr 19, 2006 11:33 am

hi MiseryQ

i dont suppose you do have an afr table for a boosted engine do you ???

dave