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trick air intake temp sensor to richen fuel?

Discussion in 'Motorcycle Talk' started by Avboden, Mar 4, 2010.

  1. Alright....i guess this could work. But for me, if it were this simple, everyone would be doing it. It just seems like a bad idea to me.

    a device such as the booster plug


    takes the ambient temp, and the air intake temp, and lowers the *apparent* intake temp that the bike sees so that the bike will richen the fuel mixture.

    I know of people that claim it really smoothed out their bike. Idk though....thoughts?

    what do you guys think? The only reason I would think this specific one would work is because it varies the added resistance with the ambient temperature.
    Last edited: Mar 4, 2010
  2. KevinD

    KevinD Modulator Staff Member


    Why not just get one of the "other solutions" for a bit more (my TFI tuner was only 10% more.)

    Seems like an awful expensive gimmick when a true tuner isn't that much more.


  3. it is similar to what a power commander does, except on the opposite side of the air flow.
  4. Yeah, works just fine, and older power commanders did similar things (mess with sensor input to change fuel map).

    "Dry Shot" nitrous systems can be aimed at the temp sensor to get a little richer mixture with the N02.
  5. PeteN95

    PeteN95 Moderator Staff Member

    Common hot rodding trick on cars. I'd go with a PC because you can adjust specific points up or down. Aftermarket exhaust often cause rich spots, as well as lean.
  6. Get a tuner (PcIII, PcV, Yosh) and put it on the dyno.... do it right.

    Personally I'd like the Yosh, but I can't afford it.
  7. Is this similar to the EBay 29 cent resister (or "booster chip") for your car that is supposed to do the same thing? You know, the one they charge $39.99 for. :scratchea

    I believe it fools your car into thinking the air going into the engine is cooler, therefore the computer adjusts the fuel/air mixture to give you more horsepower.
  8. I think I saw something similar to this made up on the "powerblock" on spike the other weekend...a quick search of their website didn't show anything....I didn't see the beginning or end of the segment, but they were doing something with the airflow sensor for go-fast goodness...
  9. From what it looks like, it's a just a thermistor. I wouldn't use it.

  10. why not? I get that it's sketch...I just don't feel like it would be a good idea. but WHY...that is the question
  11. Just from the looks of it, it can be set for a baseline value and the difference is made from the varying resistance of the thermistor so it can only be set for a specific value that carries throughout the rpm's. I could be totally off though, I don't know what is actually in the box.
  12. PeteN95

    PeteN95 Moderator Staff Member

    It appears to have an adjustment knob, how are you going to know how rich to make it? Are you going to install a wide range O2 sensor too? And you may have to adjust it for different power settings? It just seems like a lot of $ for a halfassed device?
  13. I guess the knob is for the baseline. And it's meant for BMWs which already have a wideband o2 sensor and adjust acordingly.

    Ahh that could be an issue. It doesn't change with the RPMs...then again the temperature has nothing to do with RPMs...that's what the O2 sensor helps to adjust the fueling.
  14. True, but the temperature will remain fairly stable so the fueling can't be changed at various rpms. It'll be one value all the way across.
  15. because alot of bikes ECU's (and i hope a BMW) will over time adjust the airfuel mixture based on an 02 sensor to keep it where it should be.

    so it will be richer or leaner or whatever till the ECU adjusts itself (the same way it adjust for dirty/clean air filters etc...)

    so over time, you waste your money! to gain nothing.

    buy a real ECU tuner


    ps. a sucker is born every day
  16. Lots of bikes came stock with air intake temp sensors (like my TL). However just richening the fuel mixture won't necessarily make your bike run better/faster. You need the correct air/fuel ratio for your bike to burn the fuel correctly and efficiently. If these units are universal, they probably won't work that well, but if they're model specific there's no reason they shouldn't help if they're designed well.
  17. How many bikes actually run closed-loop with an O2 sensor?
  18. It'd be smarter to spend the dough on wideband o2.
  19. KevinD

    KevinD Modulator Staff Member

    One's with catalytic converters have to.
    I don't know about any others...

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