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Performance tune

Discussion in 'Performance and Tuning' started by Tarpon24, Jun 23, 2012.

  1. Jun 23, 2012 at 7:29 PM
    #1
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    I get very bad mpg and was thinking about getting a dyno tune from a local shop, and I was wondering if anyone else has tryed this and seen any improvements??
     
  2. Jun 24, 2012 at 9:21 AM
    #2
    Torspd

    Torspd Tor-nication

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    How many miles does your truck have?

    Dyno tuning the OEM ECU isn't going to happen. It is locked software. You would need sn aftermarket EMS for that.

    Now, to go along with the first question, is you truck lifted on large tires, or are you on factory size tires still?
     
  3. Jun 24, 2012 at 9:27 AM
    #3
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Your heavy 20 inch rims are probably what's wrong.

    As said by Torp, you aren't going to be able to tune the stock ECU.
     
  4. Jun 25, 2012 at 9:25 AM
    #4
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    I'm just trying to figure out somthing to do because this mpg is killing me from what I heard theirs no reason a Tacoma on 20's with 33's should get 10 mpg it's not like I'm a lead foot either I rarely go over 2000 rpm excellerating.
     
  5. Jun 25, 2012 at 9:25 AM
    #5
    whippersnapper02

    whippersnapper02 Well-Known Member

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  6. Jun 25, 2012 at 9:26 AM
    #6
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    And it has just under 25000 miles
     
  7. Jun 25, 2012 at 9:26 AM
    #7
    mjp2

    mjp2 Living vicariously though myself Staff Member

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    For 33" tires you'll want to regear your differential(s).
     
  8. Jun 25, 2012 at 9:32 AM
    #8
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    To what and where do I get them. And will that help anything ? I used to have a lifted diesel and on the u just slapped a lift on some rims and tires and a chip and it was good to go.
     
  9. Jun 25, 2012 at 9:59 AM
    #9
    Torspd

    Torspd Tor-nication

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    30k miles is the regular service interval for changing out the factory fuel filter.

    I highly doubt yours is clogged so bad, at this point, that you would want to change, but depending on a few things, it could be a source of bad mileage.
     
  10. Jun 25, 2012 at 10:01 AM
    #10
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    I know I'm about to do a full service on the whole truck just incase after that in stumped I tryed everything else
     
  11. Jun 25, 2012 at 10:06 AM
    #11
    Torspd

    Torspd Tor-nication

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    Well, if you do decide to do the fuel filter, don't waste your money on the factory one. It will cost about $500, and you cannot just replace the filter. They replace everything.

    Hit up Paul at www.Dezod.com. He has a nice selection of different fuel pump kits, that will also make your fuel filter be external. So that after so many miles, you can easily swap it out again. That kit will run about $150 + or -. Plus, the pump will be better than the factory one.

    Gadget at www.URDusa.com has a fuel pump kit as well. About the same price.
     
  12. Jun 25, 2012 at 11:05 AM
    #12
    Darthyota

    Darthyota Well-Known Member

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    isnt roughly 26k miles when toyota says to change the plugs as well? on the 1gr?
     
  13. Jun 25, 2012 at 11:07 AM
    #13
    whippersnapper02

    whippersnapper02 Well-Known Member

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    Every 30K. That wouldn't drop MPGs that much but you never know.
     
  14. Jun 25, 2012 at 11:40 AM
    #14
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    I already pulled the plugs and they where fine. Took it to toyota and had them do their full diagnostic check up and was fine it's not throwing any codes either
     
  15. Jun 25, 2012 at 11:58 AM
    #15
    mjp2

    mjp2 Living vicariously though myself Staff Member

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    I won't bother addressing how gas and diesel engines are completely different...

    Taller tires = taller effective gear ratio. The engine has less leverage relative to the road so it has to work harder to maintain a given speed. Regearing can bring that effective ratio back to near-stock.

    In your MPG calculations, have you taken into account that your speedometer is off by about 9-10% since you went with taller tires? The speedometer will read slower than your actual speed.
     
  16. Jun 25, 2012 at 2:41 PM
    #16
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    I know how diesel and gas engines are different just a statement. But where would you go to purchase the gears and how much and why gears would you recommend.
     
  17. Jun 25, 2012 at 2:47 PM
    #17
    mjp2

    mjp2 Living vicariously though myself Staff Member

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    Do some reading and first learn why you'd want new gears, then worry about where to get them from and where to have them installed. The most important thing is to understand the reason for the mods and why they work. Don't blindly take advice whether it be from a mechanic, friend, or random guy on the internet.

    http://www.4wheeloffroad.com/techarticles/truck_gear_calculations/index.html

    http://www.fourwheeler.com/techarticles/wheels/129_0604_choosing_the_right_ratio/index.html

    http://www.ringpinion.com/TechnicalHelp/HowTo.aspx

    Familiarize yourself with the why and the how and then ask any questions you may have.
     
  18. Jun 25, 2012 at 9:53 PM
    #18
    Tarpon24

    Tarpon24 [OP] Well-Known Member

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    Yea I looked it up I have the 33'S but my truck doesn't perform any worse still excellerates fine and everything guess I'll just have to take the crap mileage or just trade it in. Just don't know how a v6 can get 11 to low 11 mpg on only 33's just can't fathom that.
     
  19. Jun 25, 2012 at 10:17 PM
    #19
    whippersnapper02

    whippersnapper02 Well-Known Member

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    How heavy are those donks?
     
  20. Jun 25, 2012 at 10:29 PM
    #20
    Tandum

    Tandum Member

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    I get 13 mpg on 33" tires with 456 gears...
     
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