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Gotta question for all you pros out there! I added a comptech cat back exhaust system and an Injen CAI. Is there any tuning that should be done to the stock ecu now that these bolt on mods were added?
 

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krystar said:
it will only learn fuel trim. won't learn ignition and cam.
Exactly. In closed loop, the ECU will constantly monitor the air-fuel ratio and add or subtract fuel to get it as close to 14.7:1 as possible. Periodically it then incorporates those short term fuel trim findings to long term fuel trim, on the theory that this will bring the maps closer to what the car actually needs to run without corrections in closed loop. HOWEVER, at this point no one knows exacly whether long term trim also affects open loop driving.
 

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well...can't we just test that? set it to 20% and see if we run rich in open?
 
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