Let me try this a different way: the airflow sensor does not give an absolute value, it gives a relative value. That value is checked by the oxygen sensor, and the base value is updated. No you aren't fooling the sensor, but that sensor is not the only one that affects the amount of fuel added.MightyMo said:I really doubt resetting the ECU has anything to do with the CAI. The airflow sensor sees how much air is coming in and adds the apropriate amount of fuel, and if you give it more air then it sees more. It's not like we're fooling the ECU/MAS by giving it unmetered air, or pegging out the MAS at it's peak voltage. For my test, resetting the ECU was purely to purge any fuel timing information from the 87 octane gas I had been running, I see no reason that you would need to do the same, especially since the car will re-learn with a new tank of fuel anyway given time.
The 02 sensor is so much further downstream in the situation that it effects engine performance more for the sake of emissions than performance.Tyler_Canada said:
Let me try this a different way: the airflow sensor does not give an absolute value, it gives a relative value. That value is checked by the oxygen sensor, and the base value is updated. No you aren't fooling the sensor, but that sensor is not the only one that affects the amount of fuel added.
The computer continually updates the fuel tables to adjust for changes in sensor function and various other factors, in order to keep the engine running at the air-fuel ratio specified for the current operating conditions. If you clear the updated values, then you go back to the start again. It will take time for the values to be updated to the point where the engine is running at the specified air-fuel ratio.
Running the engine leaner will give more power, but cause more heat. If you clear the computer, you will cause the engine to run very slightly leaner. We're talking a barely noticeable amount leaner, not enough to cause problems. Just adding the intake without resetting the computer will also cause the engine to run slightly leaner for a while. The computer will try to fix this by updating the fuel tables. This will occur slowly enough that you won't be able to notice the gradual loss of power.
I'm not saying the intake won't add power. I'm a firm believer that the values quoted (5-8hp at the wheels) are realistic. I'm just saying if you compare the stock air filter to the pop charger, you'll notice a much bigger difference if you reset the computer, but that difference won't last.
In other words, no, I wouldn't bother resetting the computer when you add the charger... in fact, I didn't reset mine. Resetting the computer won't make a difference in the end.
Sorry if that isn't clear, I can't do any better than that.
BMC CDAGripperDon said:I would love the little more punch on WOT. However (someones favorite word) I don't want any more noise, I like quite inside, ergo my added external and internal sound deading. Anybody got a quite CAI.
Drop in filter = K&N, ITG, BMC (stock replacement filters made of oiled cotton gauze or oiled foam)GripperDon said:DAVE
Can you tell me more as to what a "drop in filter" is as compared to the OEM Murano filter. Thanks for the response, I'll look at the link you provided.