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Originally Posted by Terry S
Doesn't a CAI provide a more unstable MAF reading and add more air at the same time on a N/A engine? With a N/A engine, the more air = leaner condition and slightly more power. However your AFR's will be all over the place (which some good tuning can fix).
Turbocharged DSM's (4g63t) is different with the CAI because its turbocharged and putting a CAI on without modifying the AFR's will cause an unstable MAF reading thereby lowering power on a whole.
Terry S
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A CAI won't "add" more air than stock... CAIs may be able to flow more air, but when called for. The engine is constantly pulling in air but most of the time the throttle is blocking that flow. So most of the time it's like sipping water from a straw - a bigger straw will allow you to work less, but won't automatically give you too much water just cause it's bigger. However, when you are thirsty the bigger straw comes in handy just like a free-flowing intake helps at open throttle. The ECU will calculate the correct amount of fuel for the measured air intake.
The 4G63 uses a MAP sensor (Manifold Absolute Pressure) and works differently than our Mass Air Flow sensor. Our MAFs measure the amount of air going past a heated wire through a certain size passageway. We can alter our intakes as long as the passageway (MAF housing) stays the same. A MAP sensor measures the pressure of the air in the intake manifold (pressure in the case of turbo... it would be a vacuum if NA). In this case, yes, changes on the intake that affect the air pressure can throw off the sensors readings.
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