Power drop and MPG drop with bigger tires and rims?

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

 

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.

 

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

 

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.

 

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.

 

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.

 

kilgoja, so i shouldn't go 17x9 on the rims? i do have a 3inch lift on my truck.

 

that's what i figure.the mpg will take a dump because you have to work the engine more to gain desire speed.

 

wow,i better think twice about the wheel package upgrade then.neither that or get a 6cyl.hehe

 

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.

 

I lost MPG going to 285's, also noticed a loss of power when climbing steep grades.

 

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.

 

i turned a jeep cherokee 4-banger into a gas guzzling gutless turd back in my early years. lesson learned...no free lunch.

 

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 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.....--->>>



Stock Sizes

• 255/75-16

• 
  
  Firestone Destination LE
  245/70-R17
  $145 each
  

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


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.

 

good choice thats what i have... on my radiant red
17's 285/70R17 duratracs

 

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