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Re: JBA Headers and Exhaust Installed! :)
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 understanding 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...
Last edited by Air2air : 05-14-2008 at 10:26 PM.
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