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PhalC1
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Just got an 2001 Rav4 upgraded from the 1999 and Im new to the whole VVT-i thing. Is there any way to bypass is and put a CAI on it or is the little tube thing coming out sufficient enough?
nfafan, generally speaking I would agree with your comments above. However, I think the OEMs have multiple objectives that tend to complicate the end result. I think the power train engineers try to predominately balance and optimize a vehicle's cost, power, emissions, fuel economy. These are often opposing objectives and sometimes power is sacrificed for the other three.nfafan said:All just my 2-cents and again not meant to flame, I'm simply looking at it from a practical angle:
If Toyota/BMW/Nissan/Honda/Chebby/Ford/et al thought that "dryer vent" piping and a cone-filter would add HP/torque figures that they could tout to help sell more cars with - then you'd see it under the hood from the factory.
No doubt about it!RAV4Don said:nfafan, generally speaking I would agree with your comments above. However, I think the OEMs have multiple objectives that tend to complicate the end result. I think the power train engineers try to predominately balance and optimize a vehicle's cost, power, emissions, fuel economy. These are often opposing objectives and sometimes power is sacrificed for the other three.
For example mandrel bent exhaust systems can add HP over almost any factory system that has a cheap, quick formed OEM exhaust with many kinks, turns, sizes. But you won't find many mandrel bent exhausts from the factory due to their higher cost.
Not detracting from anything said already, but one of the big reasons for the airboxes is "emissions standards" since, as someone else said, they have to toss emissions into the mix to get it to pass inspection in certain states and/or countries.PhalC1 said:Just got an 2001 RAV4 upgraded from the 1999 and Im new to the whole VVT-i thing. Is there any way to bypass is and put a CAI on it or is the little tube thing coming out sufficient enough?
Wayne, I don't see the intake having much if anything to do with emissions. Most intakes today are designed to reduce the roar of air intake on WOT and some plumbing that many connect to the intake that could easily be rerouted. Other than that there is nothing emissions related that should be adversely affected with a well designed aftermarket intake system.Wayne said:Not detracting from anything said already, but one of the big reasons for the airboxes is "emissions standards" since, as someone else said, they have to toss emissions into the mix to get it to pass inspection in certain states and/or countries.PhalC1 said:Just got an 2001 RAV4 upgraded from the 1999 and Im new to the whole VVT-i thing. Is there any way to bypass is and put a CAI on it or is the little tube thing coming out sufficient enough?
If you're not concerned about emissions, by all means, rip that crap out of there, but... From everything I've heard here in other threads, the ECM programming of the RAV4 really keeps a CAI from adding much if anything, if you don't go the whole route of adding a custom exhaust as well, then "reboot" your ECM... Air in, air out... That sort of thing, and it gets all math-related..
As for me, until my 2005 RAV4 leaves warranty, I'm pretty much going to leave the internals stock. After that, I'm going to go nuts... Hopefully by then, someone will have figured out how to add the tC Supercharger and an as-yet-created 6-speed manual transmission.
Wayne