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Re: JBA Headers and Exhaust Installed! :)
Quote:
Air2air previously said:
Headers typically make you run 5% or so lean. This is actually NOT compensated for in the ECU in our case.
It's because the sensor that talks to the ECU about mixture is the MAF or Mass Airflow sensor on the throttle body. Since the ECU does not know that headers are down there, it just delivers fuel in proportion to the air going into the throttle body.
How much fuel it delivers is dictated by the ECU map. The mixture settings and ignition advance must be manually reset by 3rd party software. Then, the new settings are reflashed into the ECU with a Serial cable.
My uderstanding is that you normally aspirated guys don't have to worry. But supercharged you could get detonation at high RPMs if you dodn't do the above...
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Doesn't the O2 sensor provide feedback to the ECU based on what it senses in the exhaust mixture?
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08 Brick
All pro skids and rocksliders
85 4runner
detroit locker
hi-steer
power steering
Trail Gear springs
Lots and lots of articulation
many other mods
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