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Power drop and MPG drop with bigger tires and rims?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by t2dn999, Jan 22, 2010.

  1. Jan 22, 2010 at 8:59 AM
    #1
    t2dn999

    t2dn999 [OP] Member

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    I was wondering if I was to upgrade my prerunner 2.7L xcab with bigger tires and wheels how bad do you think my power loss and MPG would be? how about you guys with the 6cyl. you notice the truck gotta work a little harder and your mpg went down hill?

    the rims and tires i want to get would be;285/70r17x9


    [​IMG]
     
  2. Jan 22, 2010 at 9:11 AM
    #2
    ItalynStylion

    ItalynStylion Sounds Gooooood

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    It really depends on a couple of things. How big the diameter of the tires are, their tread pattern, and the width. You don't LOSE hp, it's just wasted turning the extra mass and fighting friction. How much though is hard to measure without a dyno.
     
  3. Jan 22, 2010 at 9:30 AM
    #3
    kilgoja

    kilgoja Well-Known Member

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    yeah i would say at the biggest on the 2.7L go with 265/75/16 tires....right now i'm running 265/70/16...gonna go up a size on my next set of tires
     
  4. Jan 22, 2010 at 9:36 AM
    #4
    t2dn999

    t2dn999 [OP] Member

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    Irgrnr,if i go 265/70r17x9 do you think i still have to regear? i like they way the truck feels right now with the stock tires and wheel.i dont want to upgrade and have it compromise the power too much because its a 4 banger and doesn't really have power.
     
  5. Jan 22, 2010 at 9:36 AM
    #5
    Stillfly199

    Stillfly199 ( . )( . )

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    I noticed a drop in MPG with the V6 going to 285's, but I dont think the truck has lost power, but with the 2.7 I think you would notice a pretty big difference.
     
  6. Jan 22, 2010 at 9:39 AM
    #6
    Bobcat Sig

    Bobcat Sig Active Member

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    Yes. Your MPG will decrease. You are putting 285s on your truck, which much bigger than the stock 245s that come on the 4cyl.

    I put a set of Wrangler Authority ATs (265/75) on my 6cyl and both acceleration and MPG dipped slightly. But just enough to notice.

    I suspect that on a 4-banger, it will be substantially greater. :eek:
     
  7. Jan 22, 2010 at 9:40 AM
    #7
    t2dn999

    t2dn999 [OP] Member

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    kilgoja, so i shouldn't go 17x9 on the rims? i do have a 3inch lift on my truck.
     
  8. Jan 22, 2010 at 9:45 AM
    #8
    t2dn999

    t2dn999 [OP] Member

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    that's what i figure.the mpg will take a dump because you have to work the engine more to gain desire speed.
     
  9. Jan 22, 2010 at 9:51 AM
    #9
    t2dn999

    t2dn999 [OP] Member

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    wow,i better think twice about the wheel package upgrade then.neither that or get a 6cyl.hehe
     
  10. Jan 22, 2010 at 10:29 AM
    #10
    06dak

    06dak Well-Known Member

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    You have a 5 lug or 6 lug? What rear end do you have now? I put 17 take-offs from a TRD sport on mine and didn't see much of a difference (the only difference between the stock steelies and these are a bit of weight and tire width). I have 4.10 gears though, stock.
     
  11. Jan 22, 2010 at 10:30 AM
    #11
    MyToyTaco

    MyToyTaco ╒╪╕

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    I lost MPG going to 285's, also noticed a loss of power when climbing steep grades.
     
  12. Feb 10, 2010 at 8:46 AM
    #12
    FARNORCAL

    FARNORCAL Well-Known Member

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    i notice a major power drop when i had my 03 prerunner with bigger tires it was pretty gut less. Dont go any more than a 265/75. Youll be pretty upset if you do.
     
  13. Feb 10, 2010 at 9:41 AM
    #13
    aficianado

    aficianado Well-Known Member

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    i turned a jeep cherokee 4-banger into a gas guzzling gutless turd back in my early years. lesson learned...no free lunch.
     
  14. Sep 29, 2012 at 6:11 PM
    #14
    Headcase

    Headcase Well-Known Member

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    I don't know anything about the 4.0L and the related equipment, i.e., gear ratio's etc. I do know that I have a 2010 Taco Access Cab 2.7L Manual which came with 15" steelies and a little 215 70 R15 tire which made my truck look like a clown car :rofl:from the onset off the dealer's lot almost 3 years ago.

    That said...I read about two or three of the above replies to your question and had to reply with my EveryDay experience without all of the speculation I was reading up there.

    I replaced my clown tires with 245 70 17's all around on 06 Rav4 aluminum wheels that are 17x7 and plenty of backspace. The calc for the tire comparison is below.

    Long and short of it is this...with my manual tranie and chosen tires I'm not going to be beating many people to 60 mph...But then I would have bought a Shelby Mustang or another type of factory HotRod wouldn't I have??

    Off the line I can get'em sure thing but not past 50-100 feet...so your powerloss question is valid to a point but my Taco is no dog with the tire change. 2nd my MPG FLEW. In fact, I laugh at the guys who are only getting 18-20 mpg and have on 30 or 31's.

    Look at it and follow the experience of what I am going through with my Taco EVERYDAY after it.....--->>>

    [​IMG]

    Stock Sizes

    • 255/75-16
    [​IMG]
    Current Tire New Tire Difference
    Diameter
    inches (mm) 26.85(682) 30.5(774.8) 3.65 (92.8) 13.6%
    Width
    inches (mm) 8.46 (215) 9.65 (245) 1.18 (30) 14%
    Circum.
    inches (mm) 84.35 (2142.57) 95.83 (2434.11) 11.48 (291.54) 13.6%
    Sidewall Height
    inches (mm) 5.93 (150.5) 6.75 (171.5) 0.83 (21) 14%Revolutions
    per mile (km)751.13 (466.73) 661.16 (410.83) -89.96 (-55.9) -12%

    Side by side Overlay
    [​IMG]

    First the RPM "SWEET SPOT" evaluation for the tire size calulator (when you run it at the site you'll see it) might be perfect for a some unknown vehicle other than mine with the 2.7L but in my opinion their calc's are for shit concerning my Taco for OPTIMUM RPM related to the best fuel mileage.

    I cruise down the highway at "1600 RPMs" in 5th gear at 58-60 MPH. If I need to pass I drop a gear. On the cruise control I ritualistically get 29 MPG. You'll need one of these to get accurate calulations on the mpg.

    http://www.amazon.com/Hypertech-730...TF8&colid=2DAAVXV1BTOTG&coliid=I1L81BNJB72OM6

    I have no suspension mods...yet...just the tires and wheels. I run 1.25 inch spacers for piece of mind only. I could do without if I wanted.

    Well there's my two sense... I say put the big tires on and watch your MPG go up.
     
  15. Sep 29, 2012 at 11:17 PM
    #15
    Corndawg

    Corndawg Well-Known Member

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    good choice thats what i have... on my radiant red :)
    17's 285/70R17 duratracs
     
  16. Sep 30, 2012 at 10:43 AM
    #16
    ssmith29440

    ssmith29440 Well-Known Member

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    Tire and rim combo looks good. Agressive looking tread design on tire. They should pull good through just about any terrain.
     

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