4bangerjp.com
General Forums => The Mess Hall => Topic started by: quicksand on February 23, 2011, 09:12:46 PM
-
Like many others we are tight on funds yet we have a long wish list for our rigs. I currenty run a 2in BB along with 31 BFG muds. I was thinking of bumping up to 32 or 33x10s. My LiL rig is pretty fast right now with its current mods under the hood and I am a daily driver. I have no complaints. But my concern is if I go a little bigger by adding a body lift or getting a real spring lift with bigger tires, how much power will I lose with 32s, or 33s? I can not get a gear change right now. Then do I have to get 8in wide rims or can I squeeze 32s on my 7in rims? It just seems like if I choose to do a little more one thing will lead to another. Bigger lift,bigger tires, bigger rims, lower gears. I do not want to regret anything such as lose of power, or drive line issues. Either wait till I get the funds to do it all, or do I just leave it as is. I guess maybe it just cost to run with the big dogs. I need to install my discos and see what my 31s can do with the BB, and hope I do not rip off a pumkin or somthing.
-
If you don't want to do everything else that is required with 33's then stick with 31's.
-
Well said, I will one way or the other. You are correct, step up to the plate and do it right, or stay with 31s. Thanks
-
Question will my 4.10 gears handle 32s , and would it be a big difference in power loss or minimal? Also can I but 32s on a 7in rim?
-
Question will my 4.10 gears handle 32s , and would it be a big difference in power loss or minimal? Also can I but 32s on a 7in rim?
I've got 31MTs on 4:10s and I'm not in bad shape with that until we're talking highways on grades. Dropping to 4th isn't a big deal for that. But I have found myself having to drop to 3rd on more than a few occasions just to keep up to speed in the slow lane. Zinging along at 4000rpm in 3rd doing 60- something for any length of time is no fun. Getting some headers and would like to believe that that and an efan will help the 4banger along under load on the highway; rather regear 4:88s if I go to 33s on the next tire change
-
As much as it sounds like your enjoy your jeep's current performance level, I would recommend NOT going up in tire size. Your performance will drop off considerably. Wait until you can regear.
-
I agree. As much as you want the bigger tires you will regret the power loss unless you regear. As for your answer on the I'm change you can butt a 32 or 33 on a 7 inch wheel depending on the width of the tire. I wouldn't try a 12.50 width on anything but an 8 inch width but a 10.50 can fit on a 7 inch width wheel. Remember that the wider a tire you stuff on a wheel the more it will change the shape of the tire from a flat surface you are rolling on evenly to an oval shape surface causing you to wear out the middle of the tire faster than the outside. Hope this helps.
-
Well it looks like I am gonna wait till I can regear for bigger tires, because I really do enjoy my current jeeps power right now, with all its mods under the hood. My favorite mod is the custom TB spacer and that bigger TB. Your right about that Mr Bounty Hunter, after the throttle body swap I sure would hate to lose that increased power I have. Ofcourse in balance with all the other mods under there. So in the future what gear ratio would I need for 32s or 33s for a daily driver? I am looking for somthing moderate as I spend most of my time on the road, and like to do ocassiolnal offroad. What do you guys think of 33x10s ? Thanks for all the input guys.
-
4.88 gears is the best option, nothing lower available for the stock axles.
-
Thats all they got for my dana 30 and 35? They do not have 4.56 gears for those axles?
-
Thats all they got for my dana 30 and 35? They do not have 4.56 gears for those axles?
4.88:1 is lower then 4.56:1. 4.88:1 is the lowest you can get.
-
Yes I knew that, my concern is that 4.88 may be to low for 33s. I do not know. I guess the question is does 4.88 and 33s but me close to my current set up. 4.10 and 31s?
-
Yes I knew that, my concern is that 4.88 may be to low for 33s. I do not know. I guess the question is does 4.88 and 33s but me close to my current set up. 4.10 and 31s?
4.88 and 33 is same as stock (assuming you started at 28'' and 4.10)
Your speed to rpm ratio is directly proportional with your tire diameter and inverse to the R&P ratio (1/R&P), which means the higher the number in R&P (lower gears) the more rpm for the same speed. the larger the tire diameter the more speed for the same rpm.
To compare them you can simply do simple math like this:
28/4.10=6.83
33/4.88=6.76 (1% difference vs stock)
33/4.56=7.23 (5% difference)
31/4.10=7.56 (10% off compared to stock).
-
Very Nice, thank you for that info and chart. That will be a big help.
-
Is there a difference in strengh between 4.56 and 4.88 as far as breakage or longivity?
-
No real difference, especially behind a 4banger. Go with 4.88, anything else is a waste of time and money.
-
No real difference, especially behind a 4banger. Go with 4.88, anything else is a waste of time and money.
how many times do we have to say it? in the end if you don't want to take our advice it's fine... just expect "I told you so's" later lol
-
4.88 and 33 is same as stock (assuming you started at 28'' and 4.10)
Your speed to rpm ratio is directly proportional with your tire diameter and inverse to the R&P ratio (1/R&P), which means the higher the number in R&P (lower gears) the more rpm for the same speed. the larger the tire diameter the more speed for the same rpm.
To compare them you can simply do simple math like this:
28/4.10=6.83
33/4.88=6.76 (1% difference vs stock)
33/4.56=7.23 (5% difference)
31/4.10=7.56 (10% off compared to stock).
That's a nice breakdown Sharp. I bookmarked it
-
4.88s it is, sounds good Mr Bounty Hunter. Now I just gotta save MO money. Please send any donations to --------------just kidding. OK so I need a LiL bigger lift, some 33x10s, and new gears. I CAN DO IT, YES I CAN !
-
Hey just looked at chart again and that means right now I am 10% off with my 31s compared to stock, HUH.
-
Hey just looked at chart again and that means right now I am 10% off with my 31s compared to stock, HUH.
yes, so if your speedo shows 60mph you're actually travelling at 66. Same for mpg, if your calculation shows 15 you're in fact at 16.5mpg (unless you changed your speedo gear). This is all based on having 28'' tires stock, not sure what they were on your year Jeep but probably close enough.
-
4.88s it is, sounds good Mr Bounty Hunter. Now I just gotta save MO money. Please send any donations to --------------just kidding. OK so I need a LiL bigger lift, some 33x10s, and new gears. I CAN DO IT, YES I CAN !
lol the donations :roflol:
-
Yeah does changing the speedo gear have any affect on the jeeps brain or just gives your correct reading on speedometer only?
-
Any one know the % diff on 34's with 4.10 gears?
-
Go to calculators at bc4x4.com they might have it, I am not sure.
-
Any one know the % diff on 34's with 4.10 gears?
((34-28)/28)*100 = 21.43%
EDIT: since you're not changing the R&P ratio is all proportional to the tire diameter, i used 28 as stock but you can replace it with whatever your Jeep originally had. a more simple calculation would be 34/28=1.2143, that means that real speed = 1.2143 x indicated speed, same for distance traveled. Keep in mind that this is for the theoretical diameter, to get an exact calculation you'll need to measure the distance from the ground to the center of the axle for both stock and new tires (that would account for tire deflection as well).
-
Thats nuts - thanks.
normally just stay with traffic, now I'll have to pay a little more attention to my speed.
nice website by the way.
-
Yeah does changing the speedo gear have any affect on the jeeps brain or just gives your correct reading on speedometer only?
http://4bangerjp.com/forums/index.php/topic,731.0.html