will 31x10.50-15's kill my power? - Ford Bronco Forum
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post #1 of 46 (permalink) Old 10-05-2007, 04:12 AM Thread Starter
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Question will 31x10.50-15's kill my power?

ok,

I just picked up a 1990 302 bronco AOD
it runs good (not a monster as far as power goes)

it's got stock size "touring tires" 235/75-15 (28.8"x9.2")
I wanna go a little bigger (mostly wider)
but I don't wanna lift it
I want something that's decent on the highway, not super loud, but is gonna get me up the mountains for snowboarding


how much will going to 31x10.50's kill me for highway power?
as well as my spedo?


or should I just be looking at 30x9.50-15's?




Thanks in advance...

Russ
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post #2 of 46 (permalink) Old 10-05-2007, 04:30 AM
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Quote:
Originally Posted by KrautBurner View Post
ok,

I just picked up a 1990 302 bronco AOD
it runs good (not a monster as far as power goes)

it's got stock size "touring tires" 235/75-15 (28.8"x9.2")
I wanna go a little bigger (mostly wider)
but I don't wanna lift it
I want something that's decent on the highway, not super loud, but is gonna get me up the mountains for snowboarding


how much will going to 31x10.50's kill me for highway power?
as well as my spedo?


or should I just be looking at 30x9.50-15's?




Thanks in advance...

Russ


Well first and foremost i would like to say Welcome to the forum. Secondly, the search button is your FRIEND. Thirdly, you can run up to a 33x12.5 on a stock bronco. Since you have a 302, if you decide to jump up to 33s, you probably will notice a slight power loss. Since youre looking for something quiet and will get you trough the snow, go with either a 31x10.5 or 32x11.5 BFG AllTerrain. BFG has the most agressive all terrain you can find, not to mention they are great highway tires and awesome in the snow.


Goodluck




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post #3 of 46 (permalink) Old 10-05-2007, 04:36 AM
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Well with a 302 your power sux. But by putting 31's on, you won't make it any worse. I have 33's on with out a lift, and its a dawg!!!!

In the market for another toy!! I have had a 78, 81,84,87,88,89,93 broncos, 79,80,81,82,85,87,88,92 F150s, 91,97,01 exploders, 89 jr bronco
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post #4 of 46 (permalink) Old 10-05-2007, 04:40 AM
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Anyone have pictures of a 93ish bronco unlifted with 32's or 33's?
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post #5 of 46 (permalink) Old 10-05-2007, 05:33 AM
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You'll be fine with the stock gears and 31" tires. My 200+ thousand mile 302 is still quick as shit with 31's on it.


Quote:
Originally Posted by gildedseat View Post
Anyone have pictures of a 93ish bronco unlifted with 32's or 33's?
Have you tried looking in the "Post a pic of your Bronco" thread? I would guess there's probably a few of them in there.

92 EB - 302/E4OD (205,000mi) - Eric
+ lots of cool crap.


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I am sorry to have bothered you on your forum, you should post on the home page though, dont ask any questions cause if you dont know you are stupid...
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post #6 of 46 (permalink) Old 10-05-2007, 05:43 AM Thread Starter
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Bronco Info: 1990 XLT 302 AOD Black and Grey (just picked it up oct 2nd)
I have used the search,
I've found several things saying what "will" fit,
that's not really the issue,

it's more about power loss (due to changing the effective gearing)

if I come across a set of 16" wheels,
I may go with Nitto Terra Graplers
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post #7 of 46 (permalink) Old 10-05-2007, 07:22 AM
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Originally Posted by 84broncorig View Post
Well with a 302 your power sux. But by putting 31's on, you won't make it any worse. I have 33's on with out a lift, and its a dawg!!!!
not necessarily true. i have a 302 with 35s and 3.55 and my truck is still fairly quick off the line, and it gets up to 70 just fine. however it doesnt do 90 like it use to...but why do i wanna do 90?

only downside is the tires put my spedo off around 5mph.

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post #8 of 46 (permalink) Old 10-05-2007, 08:31 AM Thread Starter
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not necessarily true. i have a 302 with 35s and 3.55 and my truck is still fairly quick off the line, and it gets up to 70 just fine. however it doesnt do 90 like it use to...but why do i wanna do 90?

only downside is the tires put my spedo off around 5mph.
is 3.55:1 the stock rear end?

"the tires put my spedo off around 5mph" at what speed?
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post #9 of 46 (permalink) Old 10-05-2007, 08:48 AM
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Let's put it this way, 31's were stock on a lot of broncos. The difference in power will be very slight.
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post #10 of 46 (permalink) Old 10-05-2007, 08:57 AM
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Also, 96GM why haven't you re-cal'd your speedo yet? It's simple as cake to do.

Yes. 3.55:1's were the stock gears for 99% of the broncos out there.

92 EB - 302/E4OD (205,000mi) - Eric
+ lots of cool crap.


Quote:
Originally Posted by dgmid61
I am sorry to have bothered you on your forum, you should post on the home page though, dont ask any questions cause if you dont know you are stupid...
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post #11 of 46 (permalink) Old 10-05-2007, 09:41 AM
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Bronco Info: 1996 XLT, 5.0, K&N, Gibson shorty headers, custom dual exhaust, 3g, B&M tranny cooler, 32" BFG A/T's
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the search button is your FRIEND.
Search may be useful and necessary, but it is NOT your friend.

Quote:
Originally Posted by stan the man View Post
Since youre looking for something quiet and will get you trough the snow, go with either a 31x10.5 or 32x11.5 BFG AllTerrain. BFG has the most agressive all terrain you can find, not to mention they are great highway tires and awesome in the snow.


Quote:
Originally Posted by gildedseat View Post
Anyone have pictures of a 93ish bronco unlifted with 32's or 33's?
any body with pics of bronco with 32's

Quote:
Originally Posted by 96GreenMonster View Post
only downside is the tires put my spedo off around 5mph.
Actually, it throws your speedometer off by a percentage at all speeds. With 32"s, mine is off by about 11-12% (e.g., speedo reads 70 mph = actual speed 78 mph)

Quote:
Originally Posted by Bronco4Life View Post


Also, 96GM why haven't you re-cal'd your speedo yet? It's simple as cake to do.
Please elaborate...the only shop around here that can do it wants $300.

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post #12 of 46 (permalink) Old 10-05-2007, 09:45 AM
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The power difference is slight but nonetheless, to me, I felt it. Back in the day, I ordered my 95 with a 5.8 and P235s. Everyone made fun of the way it looked but I didn't care because I had great throttle response!
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post #13 of 46 (permalink) Old 10-05-2007, 10:10 AM
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Bronco Info: 1987 XLT 351W 31x10.50's
I run 31x10.50's on mine with basically no noticeable difference in power. I do have the 351w, which might make some difference.

I've GPS'd the speed to compare with the speedo and I only calculate a 2-4% discrepency between actual mph and what the speedo shows, which I can live with.





___________________________________________


1987 XLT 351W 31x10.50's (Just getting started!!)
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post #14 of 46 (permalink) Old 10-05-2007, 10:26 AM
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maybe you can use a 31x11.50 instead of 10.50 if your looking for a wider stance, i didnt loose any power that i noticed when i put on 32s but i have a 300.
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post #15 of 46 (permalink) Old 10-05-2007, 11:27 AM
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Bronco Info: Skyjacker leveling coils/aal, 33x12.50 BFGs, Flowmaster Duals, 5% tint, Uniden CB, other misc mods
I am running 31x10.50xr15's right now, and like stated many times above...not a major difference in power. I am running the BFGoodrich a/t's and they are the best tire i have owned. They do great in the snow and on the highway. Just make sure you keep them properly rotated and maintained.






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post #16 of 46 (permalink) Old 10-05-2007, 12:02 PM
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Bronco Info: Very stock '92, 300 CID, M5OD, no lockers, no super-low gears, no big fat n' tall tires, no nothing!
My '92 with 31x10.5 and a carb'd straight-six has remarkably good road manners, so I don't see why it wouldn't work for you. At least you have a couple extra cylinders...
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post #17 of 46 (permalink) Old 10-05-2007, 12:13 PM
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I'm currently running the stock 3.55's with 35" tires. It's not as bad as everyone makes it out to be in my opinion. I was running 31"s, and it was fine. 35"s isn't all that bad. I do plan to upgrade to 4.88's next year, but it'll definitely get me through for a while.

You won't have any problems with torque or speed with 31"s.

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post #18 of 46 (permalink) Old 10-05-2007, 01:11 PM
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Quote:
Originally Posted by deadeyedick View Post
Search may be useful and necessary, but it is NOT your friend.







any body with pics of bronco with 32's



Actually, it throws your speedometer off by a percentage at all speeds. With 32"s, mine is off by about 11-12% (e.g., speedo reads 70 mph = actual speed 78 mph)



Please elaborate...the only shop around here that can do it wants $300.

Heres the link to recalibrating your speedo
What's a PSOM & how do I "P" it???

Mike
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post #19 of 46 (permalink) Old 10-05-2007, 04:08 PM
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Quote:
Originally Posted by deadeyedick View Post
Please elaborate...the only shop around here that can do it wants $300.
Search noobie!

What's a PSOM & how do I "P" it???


edit: Doh, tripen2 beat me to it.


It's friggin easy as hell to do... I kicked myself after I'd bought one of those fawkin TrueCal speedo recalibrators... good thing Summit took it back.


And now you can paypal Steve 300 bucks for showing you how to do it...

92 EB - 302/E4OD (205,000mi) - Eric
+ lots of cool crap.


Quote:
Originally Posted by dgmid61
I am sorry to have bothered you on your forum, you should post on the home page though, dont ask any questions cause if you dont know you are stupid...
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post #20 of 46 (permalink) Old 10-05-2007, 07:26 PM
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Bronco Info: 93 EB 347 Stroker, NP435 swap,35" BFG M/T,
you really shouldnt lose any power wit 31s i have 31x10 on and it runs great and i have a 302 and have plenty power to spin the tires on the road

347, Summit block, Air Flow Reasearch Outlaw heads, Comp Cams 282,292, 565. 574., Forged Eagle crank, Forged Eagle connecting rods, Speed Pro Pistons, Victor Jr. Intake, Comp Roller rockers, Engine works timing gears, Kevoko 9 qt baffled oil pan, Meling M68 oil pump, Holley Truck Avenger 670 (too small).
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