TORacing

wait I thought Rich was the high numbers and lean was the low numbers ie: Rich is 16:1 while lean is 8:1?

Moostafa29

Other way around. The way I think of it, is that you start off having a 1:1 ratio, that being as rich as you can get, air units to fuel units. The higher that ratio gets, the leaner you become. Thats the way I think about it in my head, but I'm pretty new to this as well, so if I'm wrong, someone please correct me.

OfficerFarva

that sounds good to me. I think of it as just the lower the first number is, say 8:1, theres more fuel in the ratio than runing lean like a 16:1. Basically, the more air the leaner, and the less air means more fuel, so richer. Also, I'm wondering if since it could be running so rich is why it bogs down if i give more than a 1/4 throttle. Could this be b/c it's running rich and drowning out the spark plugs when more fuel is required if i give more than 1/4 throttle? At half throttle it acts like it wants to go and lurhces and hits a flat spot, then sputters off backfires like a burst fire sub machine gun! anyway, jw if my thoughts on the spark plugs make any sense.

Glyphon

the way you are thinking, it would be a fuel-air ratio. its not. its air-fuel ratio.

building off of what moostafa said...

air unit : fuel unit.
Stoichiometric AFR is 14.7 air units : 1 fuel unit

so, if you have less air units in the mix, the gasoline ratio is higher.
<14.7:1 = rich
>14.7:1 = lean

:edit: gah. that's what i get for attending to work before finishing a post. someone beats me to it

rkostolni

I have the N flash and I think my car's running extremely rich from that flash level as well.