Manually Control Air/Fuel Intake Values.

[instantkevin]

the director where I work has a WRX and he has a 2 stage ecm... basically another ECM wired into the original ECM. the 2nd one is calibrated for performance. when he flips the switch you can see the additional smoke from the exhaust because it runs lean. flip it again and he's back to the original ecm. this is more benficial for him because he has a turbo and he has increased the boost to 16lbs.... and he has a free-flowing exhaust.

on a naturally aspirated 3.1 i don't think the slight gains are significant enought to justify the expense. I say forget about it and use laughing gas if you want a "performance switch."

[Viper_Storm]

Originally Posted by instantkevin

the director where I work has a WRX and he has a 2 stage ecm... basically another ECM wired into the original ECM. the 2nd one is calibrated for performance. when he flips the switch you can see the additional smoke from the exhaust because it runs lean. flip it again and he's back to the original ecm. this is more benficial for him because he has a turbo and he has increased the boost to 16lbs.... and he has a free-flowing exhaust.

on a naturally aspirated 3.1 i don't think the slight gains are significant enought to justify the expense. I say forget about it and use laughing gas if you want a "performance switch."

who the hell is talking about a 3.1? we are talking about ls* engines.

[instantkevin]

whoops... brain glitch. nobody mentioned engine size... so I mistakenly assumed we were talking about the 3.1 i read about in another thread. i didn't catch my mistake.

but even still, optimizing your A/F ratio will make your engine run smoother... but if you go to far and run lean, you will lose power. without some mode of adding more air along with the fuel (i.e. forced induction, nitrous) I don't see a significant gain.

[Viper_Storm]

Originally Posted by instantkevin

whoops... brain glitch. nobody mentioned engine size... so I mistakenly assumed we were talking about the 3.1 i read about in another thread. i didn't catch my mistake.

but even still, optimizing your A/F ratio will make your engine run smoother... but if you go to far and run lean, you will lose power. without some mode of adding more air along with the fuel (i.e. forced induction, nitrous) I don't see a significant gain.

i did mention that it was ls* engines up above, about 2 posts before you said something about 3.1. also it will be forced induction, turbo... but the problem is if im pushing 600+ hp to the wheels (i can see this happening, maybe) i want to be able to lower the air / fuel intake levels so that when im sitting in bumper to bumper traffic i dont run out of gas. but i also wanna be able to crank it back up when i need it... lol, like am i about to race? crank that shit up, am i just out crusing? crank it down.

[supervisor1886]

i had a carbed car before and I leaned the Q-jet so much for emissions that it was hard to run the car while the engine was cold, but then fine (no lean knock and it had power too)
305 Cutlass Supreme,stock rebuilt Q-jet
My fuel estimates: lean 18liter/100km
poor perfomance

normal (a bit rich) 25Liter/100km
fast
see the difference now
So when you rebuild the carb think economy too

[instantkevin]

I'll try to remember to ask him how his works. He has an electronic blow-off valve that changes the max level of boost and fuel map when he flips the switch, or he just runs lean without changing the level of boost when he turns the switch off.
I'll ask him.

Any real performance shop that programs ECMs should be aware of this process. they should be able to tell you exactly what you need. Essentially all it is, is a blow-off valve that holds the pressure to a higher limit and a piggy-back/stage II ecm.