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Suprisingly Bad Fuel Economy

Discussion in 'Technical Chat' started by Clank, Jul 13, 2009.

  1. Jul 13, 2009 at 12:40 PM
    #1
    Clank

    Clank [OP] Member

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    Connecticut/Texas
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    00 PreRunner 2WD
    Flow Master Exhaust, K&N Intake
    I usually don't bother, but I checked my fuel economy after I installed a K&N cold air intake.... 13.5 MPG! This was driving normally, not too slow, not too fast, partially city, partially highway. The only ways I know how to improve this are intake and exhaust, both of which are upgraded... Any other tips? Oh, yeah, I've run injector cleaner through it about 6 months ago, definately going to do that again soon.
     
  2. Jul 13, 2009 at 1:21 PM
    #2
    wiscdave

    wiscdave Lets Do It!

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    Past ride - 3" OME 885s&Shocks/ TSB 1.5AAL/ AX184 Rims 285 Firestone destination ATs/ 2 Shallow mount P310s in Supercrew Box - Punch 601s, Beefed up Hunter Brush guard, Tint, Fog light mod, AFE Drop in, AC and Fog light mods, scangauge
    CAI and bad MPG after install...not shocked at all.

    I'd recommend the Deck plate mod and call it a day. Stock map is best for mpg
     
  3. Jul 14, 2009 at 4:54 PM
    #3
    Clank

    Clank [OP] Member

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    Flow Master Exhaust, K&N Intake
    Wouldn't a cold air intake increase gas milage? Maybe I'm stupid, but it seems that if it were easier to get the air into the engine it would run more efficiently. More air = more percentage of fuel burned, right? equals more efficient?
     
  4. Jul 14, 2009 at 4:56 PM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    Those "Cold Air Intake" s are takeing hot air from under the hood. On the first gens, J&N CAI's have shown a LOSS on the dyno. Put the stock airbox back on, and do the deck plate mod. :)
     
  5. Jul 14, 2009 at 4:56 PM
    #5
    Clank

    Clank [OP] Member

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    00 PreRunner 2WD
    Flow Master Exhaust, K&N Intake
    What about replacing the fuel filter, been a little while since I've done that.... Maybe too long? I've contemplated getting a throttle body spacer, but I'm not sure how they've field tested. Theoretically, they'd work great, but who knows?
     
  6. Jul 14, 2009 at 5:01 PM
    #6
    Clank

    Clank [OP] Member

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    Flow Master Exhaust, K&N Intake

    ok, i can definately buy that. here's my problem... i busted my original box on accident, and figured why replace an origional part if i could get more hp/mpg (depending on how i drive) by getting a cai. what's this deck plate mod you're talking about? is there anyway i can get fresh air to the cai without cutting out part of my quarter panel?
     
  7. Jul 14, 2009 at 5:02 PM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    The Deck Plate mod is:
    http://www.trdoffroad.com/articles/deckplate/index.php
     
  8. Jul 14, 2009 at 5:10 PM
    #8
    Clank

    Clank [OP] Member

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    Flow Master Exhaust, K&N Intake
    Oh, ok... I've heard of that before, only without the ability to replug the hole. doesn't quite help in my situation, unfortunately. What if I ran PVC through my fenderwell from under my front bumper to my filter? theoretically,I'd get fresh, cold air to my filter, and not hot air from under my hood, plus i now have a larger surface area on my filter.... better mpg/hp, i would think. maybe i'm wrong, who knows.
     
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