IAT sensor override

Discussion in 'OT Driven' started by Vote_Quimby, Sep 28, 2006.

  1. Vote_Quimby

    Vote_Quimby New Member

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    Has anyone done this to their car (well specifically a 2004 celica GT). Seems like a cheap way to get a few more HP in a car that drastically needs it. DD by the way and don't want to mod it out, just make it a little peppier. cold air intake, and exhaust are pretty well tried and true but these chip things are intriguing.
     
  2. saxman

    saxman Burninating the peasants

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    They work on the concept that cold air is denser, so needs more fuel. More air + more fuel = more power.


    A great concept, if the air was actually colder. Instead, you got same air + more fuel = no more power(less if anything), and your car running way rich
     
  3. Vote_Quimby

    Vote_Quimby New Member

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    kinda what i thought. thanks though.
     
  4. deusexaethera

    deusexaethera OT Supporter

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    Another cheap way to add HP to a car is to add nitrous to it. It doesn't work all the time, obviously, but let's face it: how often do you use the upper movement range of your throttle for more than a couple of seconds at a time? A nitrous injector wired to a button underneath the gas pedal would do nicely to enhance your stoplight-running ability without affecting your normal gas mileage or requiring a massive overhaul of the engine.
     
  5. P07r0457

    P07r0457 New Member

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    you just don't know how nitrous oxide works if you think that's a good idea.
     
  6. deusexaethera

    deusexaethera OT Supporter

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    I know how it works. Its an oxidizer, and it's recommended that it only be used when the throttle is completely open; at the same time, there isn't any reason why it can't be used with the engine at low RPMs, so long as it's already breathing in all the "real" air it can get. My suggestion of using a switch triggered by the gas pedal bottoming out is neither hypothetical nor unique -- it's been done before, written about, and admired by people who like adding cheap horsepower to their cars.
     
  7. Vote_Quimby

    Vote_Quimby New Member

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    hmmmmm interesting. just gotta do something. exhaust/intake/chip are next. in line. then perhaps NOS. supercharger is like $5000.
     
  8. deusexaethera

    deusexaethera OT Supporter

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    Jesus. Yeah, forced-induction is expensive as hell, isn't it?

    A cold air intake will give you a little more power (especially if your stock intake is shaped like small intestines, like the one on my friend's Tiburon), and it will make the car sound meaner without giving it that 16-year-old-with-a-fart-can sound.

    An aftermarket exhaust won't really help, though, because without a turbo or a supercharger the total amount of air moving through the engine isn't going to increase by much, and the exhaust pipe only works right if it's narrow enough to keep the exhaust moving fast so it suctions the fresh exhaust out of the engine. Making it too wide will slow the exhaust stream down too much, and you'll actually LOSE power because less of the fresh exhaust will be cleaned out of the engine after each power stroke. If you had forced-induction, it would be a different story.

    If you are INCREDIBLY careful with your measurements, you can increase the compression of the engine a bit by shaving down the underside of the cylinder head -- but you have to make ABSOLUTELY SURE that the valves will always close before the pistons smack into them. Even a minor increase in compression will add a noticeable (though still not large) amount of power, because higher compression allows the engine to convert more of the explosive force into motion instead of wasting it out the tailpipe. You'll have to run premium gas to prevent pre-ignition, though.
     
  9. Vote_Quimby

    Vote_Quimby New Member

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    that's one of the main sticking points on the exhaust. don't want it to sound stupid since i'm too old for that and i use it as the DD. Just want more ponies without sacrificing MPG (too much) and without spending 1/3rd of the cars value on a S/C.

    No real engine mods right now. maybe in a couple of years.
     

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