Whats better to run if your N/A is it better to run lean? Or is it better to run rich??? Please explain why its better to run that choice that you choose. Thanks.

 

Rich= bad gas mileage
Lean= boom

You want a proper balance.

 

hmmm yeh thats hard. So whats other pro and cons to runing rich???

 

Pros: Burns cooler, less oxygen level --> less complete burn --> less heat

Much the way a lighter burns yellow and a cutting torch is blue or white
The cooler burn also means less chance of pinging

Cons: Pretty much just that you'll lose horsepower from running richer, eventually you can reach a point that the fuel actually "washes" the cylinder walls and removes the oil, which is bad, and its an extreme case. Lot more exhaust pollution and deposit alot more carbon on your engine parts and even unburnt fuel in your cat.

 

ahhhhhh i see...Now how bout pros can cons to runing lean beside pingin or detonating or knocking whatever you wana call it...

 

Here is a thumbnail sketch that I posted a bit ago:

OK here is a litter primer.......but I hate giving tuning numbers..cause YMMV.
14.7 is mandatory for emissions with a 3-way catalyst. That is the catalyst that oxidizes CO and Hydrocarbons and reduces NOx. It will have an O2 sensor before and after. 14.7 Air/Fuel ratio is what every engine (except the lean burn ones...which are currently rare) runs during closed loop ECM control.

15.2 ish ... which is lean ... is tolerable on a stock motor driven by a little ol person, and will result in the best MPG. Just don't push it or lug it. HC and CO emissions are down, but NOx is up with this tuning arrangement.

12.9 ish to 12.2 ish is where you should find best power NA. To get closer you need a dyno and specific experience with the setup. Richer is safer against detonation. 12.5 ish is probably a good starting place.

If you can let it run closed loop in daily driving at 14.7 A/F with a cat, your kids lungs will appreciate it in the years to come. These engines really dump a lot of smog causing baddies when run rich.

Regards,
BigMoose

 

haha cool nice explaination Thanks a lot. Anyone else?