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Bigger Tires - Less Power

Discussion in 'Performance and Tuning' started by rossivey, Mar 8, 2012.

  1. Mar 8, 2012 at 2:46 PM
    #1
    rossivey

    rossivey [OP] Well-Known Member

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    I just had 285/70/17 Duratracs put on yesterday and it feels like i dont have as much HP as before. I was wondering what mods/upgrades i can install to get it back to normal or above. Any suggestions?
     
  2. Mar 8, 2012 at 2:51 PM
    #2
    tacomalex

    tacomalex Well-Known Member

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    Re-Gear
     
  3. Mar 8, 2012 at 2:57 PM
    #3
    Andrew H

    Andrew H What is this "search" you speak of?

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    See build thread.
    Nothing that's really financially practical.
     
  4. Mar 8, 2012 at 3:07 PM
    #4
    Bishop2Queens6

    Bishop2Queens6 Well-Known Member

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    You're forcing your engine to turn larger heavier tires so the tires are eating more hp. A CAI, TRD exhaust, TB spacer, etc won't do crap to gain back the hp you lost. The only real way to get power if force induction, i.e. super charger.

    You can also regear your truck, but since you have 4x4, you need the front and rear gears to match, so it would be about the same price to supercharge (if you pay a shop to do the regearing).

    You can live with the 16 mpgs until your tires are gone then step down to a smaller size, or regear, or super charge/ Really those are your options.
     
  5. Mar 8, 2012 at 3:11 PM
    #5
    FoundOffRoadDead

    FoundOffRoadDead whiptastic handling

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    Sell the tires you have now and step down a size. That's the best way.
    That or turbo :p Witch if you do it i want to see :p
    that or Supper charger. I vote turbo ... :p
     
  6. Mar 8, 2012 at 3:34 PM
    #6
    rossivey

    rossivey [OP] Well-Known Member

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    well i'm not stepping down a tire size until it's time for some new ones, if i step down then. These look awesome so i'll just live with the less power. i got them for the looks and the occasional mud trip. thanks for the advice guys!
     
  7. Mar 8, 2012 at 3:50 PM
    #7
    OH-MAN

    OH-MAN Well-Known Member

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    It is just a matter of science the larger tires weigh more and change your gearing. It suprises folks how much a few more pounds per tire make it work so much harder and plus the taller gear makes it even tougher to move everything.
    I put 255-85-16 KM2s on and they weigh 10 lbs more than the stockers each.
    Milage dropped like crazy but I feel the tradeoff for the better clearance and traction are worth it.
     
  8. Mar 8, 2012 at 3:54 PM
    #8
    Taco Libre

    Taco Libre Well-Known Member

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    i wonder all the time if 285's are worth the loss of power (and likely the 6th gear in my manual becoming useless). a couple of inches of tire doesn't seem like a good tradeoff for the loss or the costs of buying more power. auto might be different...
     
  9. Mar 8, 2012 at 3:55 PM
    #9
    tacomalex

    tacomalex Well-Known Member

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    Ok, before anyone else tells you to supercharge or turbo, you need to know that your horsepower hasn't changed, what did is your tire size. Think about it, your rim is still spinning at the same speed but you're covering more ground due to the larger diameter of the tire. Thus you lost power. Re-gear and you'll get back all the power you had before you added the bigger tires, I'd say 4.56 will get you back to where you were.
     
  10. Mar 8, 2012 at 4:12 PM
    #10
    magixfinger

    magixfinger Well-Known Member

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    Tail gate mod | shorty antena mod | K&N drop in filter
    about how much to regear???
     
  11. Mar 8, 2012 at 4:27 PM
    #11
    rossivey

    rossivey [OP] Well-Known Member

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    Where do I need to take it to get it re-geared? & about how much would it cost?
     
  12. Mar 8, 2012 at 4:29 PM
    #12
    Foihdzas

    Foihdzas VA7PTZ

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    ^ THIS!
     
  13. Mar 8, 2012 at 4:31 PM
    #13
    Foihdzas

    Foihdzas VA7PTZ

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    Search function... http://www.iwerearendsonly.com


    Your local handy dandy mechanic will do it for a fee, and probably get all of the parts you need for a small fee. If you do it yourself, you can save a ton of money. Basic tools are needed, with the exception of a press ... a local shop will do it for cheap.

    my $0.02


    ps.. Price depends on where you live, and who you know. Also how fast you want it done, and how much your mechanic bends you over... I think $600 would be a fair price ... But I just pulled that out of my ass..
     
  14. Mar 8, 2012 at 4:35 PM
    #14
    tacocolin

    tacocolin Well-Known Member

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    Everything Kevin from ATO did on his... and then some. LOL
    I have a 285-76-16s and I have no issues driving in 6th gear! I drive from 4k-7k feet in a 5 mile stretch of road everyday and it will pull the hill in 5th gear at 50mph, so its not THAT big if a change in gearing. Does it feel fast? No, its a 236 hp off road truck, not a race car. LOL
     
  15. Mar 8, 2012 at 4:39 PM
    #15
    Taco Libre

    Taco Libre Well-Known Member

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    question answered! your truck looks badass. nice work mang :)
     
  16. Mar 8, 2012 at 4:41 PM
    #16
    Redgrom

    Redgrom http://www.tacomaworld.com/forum/2nd-gen-builds/29

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    Anyone in Souther California want to recommend a good shop that will re-gear? I have looked into ordering from east coast gear supply and trying it myself but not 100% sure thats the best idea. Any idea the cost to re-gear both diffs?
     
  17. Mar 8, 2012 at 9:15 PM
    #17
    Yamaha Dave

    Yamaha Dave Well-Known Member

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    Gotta pay to play...
     
  18. Mar 8, 2012 at 9:57 PM
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    Redgrom

    Redgrom http://www.tacomaworld.com/forum/2nd-gen-builds/29

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    May just have to give James a call and get a quote.
    Thanks!
     
  19. Mar 9, 2012 at 11:14 AM
    #19
    Foihdzas

    Foihdzas VA7PTZ

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    true
     
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