Added a cold air intake and catback on 2005 2.0L 2wd
I have a 2005 Tucson GL with auto. I put the CAI and catback on last summer and and have noticed a little more response. It might just be the push in the seat of the pants is now coupled to the auditory response of the the intake and CAI.
The CAI is hybrid in that it uses 3" thinwall aluminum tubing (sections from an old UH-1H tail rotor drive shaft) and coupled it to a cone filter using some of the stock Hyundai elbows left over after the removal of the intake resonator box in front of the left front tire.
The catback was a custom install that used a magnaflow muffler mounted in front of the rear axle with 2.25" pipe replacing the suitcased sized muffler in front of the rear bumper. Capped it with the stock tip for stealth.
It all sounds pretty good, but it did not unleash the engines potential to same extent that occurred when I did the same mods to my 2000 2.0L auto Ford Focus which was a MAF system.
The 2.0L Tucson uses a MAP (manifold absolute pressure) system to provide signals to the engine control unit (ECU) as opposed to an MAF (mass air flow; Ford) meter in the air intake tubing. The MAP system does not have the capacity to adapt as significantly to the airflow improvements.
Although the pumping losses are improved by reducing intake restrictions and exhaust back pressure, there seems to be one regime where the combination seems the most beneficial and that is;
From a standing stop, I tip in the throttle about 20% and begin my acceleration. Once motion is underway, I slowly but continuously increase the throttle position until I reach the speed I want to go. Some time this is no more than a 25% increase to about 1/2 throttle! This has the affect of allowing the ECU to continuously trim the stoichometry (which I think is a term that describes the optimum air/fuel ratio) as the car snorts up to speed. The trick is to keep the engine just slightly on the increase without letting the gears shift until about 4800 rpm, then lift VERY slightly to allow the shift to occur then do it again until you get up to speed.
So it seems WOT (wide open throttle) is not the best way to go quick. In WOT the ECU goes into open loop control which does not provide the best A/F ratio.
Has any body else tried these things?
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