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Large Tires / MPG / Onboard CPU Question

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TacoSter, Nov 4, 2009.

  1. Nov 4, 2009 at 2:52 PM
    #1
    TacoSter

    TacoSter [OP] Well-Known Member

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    I put on 265/70/17's (approx 32" tire) - top of the line Michelin's & ran em for 3 weeks. Today I switched back to stock size for a few reasons. In hind sight I should have found if the issues coulda been fixed???
    1. My average mileage at the time dropped 2 to 3 mpg (Yes I did the math to correct the odometer differences)
    2. Performance was worse as immediately I noticed it took more gas pedal to get up to speed. Handling was poor as coming off a highway off ramp, felt unsafe at 45mph where I used to take it everyday @ 50-55.
    3. In fast stops, the ABS brakes kicked in even on dry pavement
    Today I tried the stock 265/65’s (same Michelin tire) & I was able to take the ramp @ 55 no problem and noticed immediate power increase, as well as the ABS returned to normal.

    My question? Is it possible to re program the on board senors / controls (whatever our tacos have) to correct all these issues
    I know 32” tires are not huge and I have up sized previous trucks to the same, but never had issues mentioned above?
    Any thoughts?

    On the plus side of the 32”s…. it corrected our faulty speedometers to read right on target. & it made the truck look more like a truck
     
  2. Nov 4, 2009 at 2:58 PM
    #2
    Brunes

    Brunes abides.

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    No...You aren't going to be able to adjust ONLY the ECU to make up for the difference.
    Regearing is going to help with some of that.

    But it's a trade off- There are always trade offs.

    On a side note- I'm surprised that just that little bit of size change created that much difference.
     
  3. Nov 4, 2009 at 2:59 PM
    #3
    TexasIslandBoy

    TexasIslandBoy THE RED DRAGON!!

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    pro comp 6inch lift 35'' tires moto 950's radfo coilovers magnaflow exhaust 5/16" front skidplate usa spec ipod interface tree pin strip mod dry drop in filter full size BFG KM2 spare
    its all in your head i have 35's and i never had felt unsafe in my truck but once but i was doing over 110mph just to see if it could do it ;)
     
  4. Nov 4, 2009 at 3:08 PM
    #4
    TacoSter

    TacoSter [OP] Well-Known Member

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    The highway off ramp is posted 25 mph. I've about pushed wusses in thier corvettes outta the way as it is tight & most do no more than 35 tops. I like 50... kinda like a free carnival ride;)
     
  5. Nov 4, 2009 at 3:14 PM
    #5
    Brunes

    Brunes abides.

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    You added a bit of sidewall- so there is alot of compliance (give in the sidewall) and the larger the side wall gets- The more it'll give.

    And with the extra 1/2" of tire height- I'm sure you get a different feel from the ride.
     
  6. Nov 4, 2009 at 3:37 PM
    #6
    TexasIslandBoy

    TexasIslandBoy THE RED DRAGON!!

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    ahh well then if you like to drive fast go with 18 inch rims and lower your truck before you flip it :p
     
  7. Nov 4, 2009 at 4:57 PM
    #7
    def4pos8

    def4pos8 Well-Known Member

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    x2 to TexasIslandBoy. The OP will become a rollover statistic.
     
  8. Nov 4, 2009 at 5:10 PM
    #8
    shook0002

    shook0002 "The Fuzz"

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    The power problem can be corrected by using more gear, maybe 4:10 from 3:73.
     
  9. Nov 4, 2009 at 5:10 PM
    #9
    NWtacoma

    NWtacoma Well-Known Member

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    why are you driving so fast that you need ABS? ugh
     
  10. Nov 4, 2009 at 5:16 PM
    #10
    brian

    brian Another Traitor

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    ABS kicked in on dry pavement? wth... I think you have something else wrong. My ABS rarely, if ever kicks in and I'm running 285/70's
     
  11. Nov 4, 2009 at 5:18 PM
    #11
    NWtacoma

    NWtacoma Well-Known Member

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    well he's driving 55mph in a 25mph so im gonna guess its excessive speed
     
  12. Nov 4, 2009 at 5:19 PM
    #12
    topgun155

    topgun155 Well-Known Member

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    I think the problem here is your driving style not your tires. Plenty of folks have done just fine with your set-up, but they understand that they have a truck and can't whip it around.
     
  13. Nov 4, 2009 at 6:28 PM
    #13
    NWtacoma

    NWtacoma Well-Known Member

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    i have 265/70/17BFG and i have no problems at all.
     
  14. Nov 4, 2009 at 6:53 PM
    #14
    brian

    brian Another Traitor

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    a kid?
     
  15. Nov 4, 2009 at 6:58 PM
    #15
    TacoSter

    TacoSter [OP] Well-Known Member

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    Maybe my ABS is screwed up?? It would happen doing 30mph and our lovely Chicago stop lights can go from green to yellow to red as little as 5 seconds. Since they started photo ticketing, ya gotta stop or it's a $100.00 bucks a pop...got 2 already this year.
    All I know is today with the new (stock size) tires and 36K on the original stock tires, my ABS never kicked in unless snow/ Ice, or if you hit a bump or pot hole while braking. With the 32's... it happened often
     
  16. Nov 4, 2009 at 7:04 PM
    #16
    TacoSter

    TacoSter [OP] Well-Known Member

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    Nope... my kid is 21... never had an accident (that was my fault) or any moving violation tickets;)
     
  17. Nov 4, 2009 at 7:09 PM
    #17
    testedone

    testedone Speak English..it's America

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    same here I switched out to the BFG 265/70/70 on my sport and have none of the problems you mention, I was doing some suspension tuning the other night and was locking up the brakes on dry pavement and the ABS did not come on...
     
  18. Nov 4, 2009 at 7:12 PM
    #18
    ofrd4fun

    ofrd4fun Well-Known Member

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    I've been running 265/70/17 for 2 years and have not had ANY of the issues mentioned above.
     
  19. Nov 4, 2009 at 7:18 PM
    #19
    NWtacoma

    NWtacoma Well-Known Member

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    wat.:confused:
     
  20. Nov 4, 2009 at 7:20 PM
    #20
    testedone

    testedone Speak English..it's America

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    Maybe a shot in the dark, but would VSC play any part in this?

    What burbs you in? I am in McHenry county
     
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