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Bad gas mileage with stock intake plenum

Discussion in '1st Gen. Tacomas (1995-2004)' started by Billison_, Feb 10, 2019.

  1. Feb 10, 2019 at 7:47 AM
    #1
    Billison_

    Billison_ [OP] Active Member

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    i just recently removed the supercharger on my 2001 Tacoma 3.4 and returned everything to stock. All vacuum lines are routed and there are no leaks anywhere. The truck has 60k miles on it and has had the blower on it since it was new. I was getting around 15-16mpg on Highway with the s/c and I am literally getting the same mpg with the stock intake. Anyone have any key point areas I should check to see what the hell is going on? Btw: tb is clean, maf is clean, air filter new, and I have the Arb snorkel without any blockages.
     
  2. Feb 10, 2019 at 7:49 AM
    #2
    JayRolla

    JayRolla Well-Known Member

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    Sounds like good gas mileage to me.
     
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  3. Feb 10, 2019 at 10:57 AM
    #3
    Billison_

    Billison_ [OP] Active Member

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    I don’t think I should be getting the same mileage boosted as n/a though
     
  4. Feb 10, 2019 at 7:43 PM
    #4
    Luv my yota

    Luv my yota Well-Known Member

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    Did you unplug the battery by chance?, it needs to relearn the new amt of air coming in, does it smell rich? If so the ecu still thinks it has the charger on it. Less air is coming in because its not sucked in, leading me to think it’s gonna take 300-500 miles to relearn just like when you put a charger on it.
     
  5. Feb 11, 2019 at 12:16 AM
    #5
    tacopashka

    tacopashka Well-Known Member

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    What you want for that blower?
    Does it not need a tune maybe? I’ve never looked into this but could it be a possibility?
     
  6. Feb 11, 2019 at 9:36 AM
    #6
    Billison_

    Billison_ [OP] Active Member

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    I did unplug it and have ran 3 tanks of gas. I get around 240 miles to the tank. Just seems odd to me. Everything is clean and working so I’m at a loss. I guess I’ll see what happens
     
  7. Feb 11, 2019 at 9:39 AM
    #7
    Billison_

    Billison_ [OP] Active Member

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    I have the blower, urd 7th injector, and all the goodies with it. (I still need to take out the high pressure fuel pump) but I’m wanting around 3k for the lot. It’s all clean and has fresh oil in it with no slip in the nose. Dm me if you wanna work something out!
     
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  8. Feb 11, 2019 at 10:35 AM
    #8
    JayRolla

    JayRolla Well-Known Member

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    Just leave the pump. Someone can source a walbro pump for cheap and wont hurt your rig. Forget taking that tank out. Lol.
     
  9. Feb 11, 2019 at 11:20 AM
    #9
    tony2018

    tony2018 Well-Known Member

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    So you reset the ecu and allowed the vehicle to relearn idle and what not? Actually, is that a thing for toyotas?
     
  10. Feb 11, 2019 at 11:55 AM
    #10
    Crash.HM

    Crash.HM Member

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    Total tangent, but I thought I probably didn't need a new thread. I'm getting a pretty consistent 19mpg with my v6 5spd. Is that pretty far out of the ordinary?
     
  11. Feb 11, 2019 at 12:14 PM
    #11
    JayRolla

    JayRolla Well-Known Member

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    That's a thing for pretty much all ECU controlled fuel injected cars. The fuel trims have to settle out.
     
  12. Feb 11, 2019 at 12:28 PM
    #12
    Billison_

    Billison_ [OP] Active Member

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    Hahaha yeah but the whine drives me effing crazy. I’ve never heard a pump that loud and on summer days in vegas it screams. Brand new too and walboro said that’s normal.. :crazy:
     
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  13. Feb 11, 2019 at 12:31 PM
    #13
    Billison_

    Billison_ [OP] Active Member

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    I think that’s probably right where you want it... I’m getting 15 or lower on highway driving and less in the city. Exact same mpg I was getting romping around with my truck boosted. You should be good! If you’re worried about it, get a new air filter, clean your tb and aic, and get new plugs and wires. Just tune it up.
     
  14. Feb 11, 2019 at 12:34 PM
    #14
    tony2018

    tony2018 Well-Known Member

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    Your highways and city streets, any hills, declines/inclines?
     
  15. Feb 11, 2019 at 1:14 PM
    #15
    JayRolla

    JayRolla Well-Known Member

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    I feel you on that. Its why I installed a denso 190lph from an Evo Lancer. Flows enough for supercharger with no noise. It is normal for aftermarket pumps. Their nick name are "whineboro". Helps to keep the tank full.
     
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  16. Feb 11, 2019 at 1:27 PM
    #16
    cruxofthebisquit

    cruxofthebisquit Well-Known Member

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    OME and worth every penny.
    I get 240 a tank also and so do lots of people on many other threads about gas mileage. There is over 20 years of evidence on the 3.4 that shows some are thirstier than others. You got a thirsty one.
     
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  17. Feb 11, 2019 at 1:31 PM
    #17
    RysiuM

    RysiuM Well-Known Member

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    Why do you think your gas mileage should change? Gas mileage is is based on the engine efficiency, truck body shape/weight and driving style. When you removed SC the only thing that changed was the SC weight, but that few pounds you would not see on your gas gauge. Truck body shape/weight at given driving style (acceleration and speed) determines the power requirement. SC gives you ability to get more power of the engine (more power, more gas) but if you did not drive pedal to the metal with your SC the power usage probably did not change much, hence no gas mileage difference.
     
    Last edited: Feb 11, 2019
  18. Feb 11, 2019 at 3:32 PM
    #18
    JayRolla

    JayRolla Well-Known Member

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    Exactly. Well said.
     
  19. Feb 11, 2019 at 5:23 PM
    #19
    Billison_

    Billison_ [OP] Active Member

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    Because driving under boost means you have less gas mileage because the computer is using more fuel with the forced inductionunde boost which happens a lot. Taking off the supercharger means better gas mileage as you’re not getting boost which is not requiring extra fuel. Also the drag of the supercharger is no longer there. Gotta take hp to make hp. Plus the truck was not tuned correctly with timing in open loop nor was it fine tuned with the 7th injector so fuel mileage would not have been at its best under those conditions Weight, shape, drag, are literally the top layer of it. Just trying to get the best mileage out of her as I’ve never owned the truck without the s/c. Can’t imagine that I’d get the same mileage.
     
  20. Feb 11, 2019 at 5:24 PM
    #20
    Billison_

    Billison_ [OP] Active Member

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    dude ain’t that some shit... I read about people getting way better but also worse so I guess you’re right.
     
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