[5jeep]

Hi,

Can someone tell me if its ok to put 33 x 12.50 tires with 15x8 wheels and a 4 inch lift kit on a 2.4 L , V4 engine (Jeep Wrangler).? Some say that the engine will not be able to handel it and the engine will break down soon.

I dont plan to do go offroads or anything just use it on highways and on road as a daily driver. Thank you in advance

[Jerry Bransford]

The engine itself is fine but with bigger tires like that, it will bog the engine down. 1st gear will seem like you're starting off in 2nd gear, and 6th gear will be nearly unusable.

Look at the 33" tires as having a longer radius which means they have more leverage against the axleshaft, which means they have additional leverage against the engine... which simply means the engine has to work harder to turn 33" tires than it does with 30" tires. Not to mention the larger tire's increased weight, rolling resistance, mass, and the fact the Jeep sits higher up into the windstream so it experiences greater wind resistance.

What's the quick and easy but expensive fix? You need to regear both of your axles to a lower ratio which will raise the engine RPMs a tad which will enable it to regain its lost performance. For 33" tires with your 2.4L engine, regearing both axles to a 4.88 ratio would be ideal. It costs in the neighborhood of $1200 or so to do that.

[Mud_driven]

with what he said

[5jeep]

Hi Jerry,

I appreciate your suggestion, do you know where I could regear my axels?

I also wanted to know instead of regearing the axels can i install any engine performance enhancer to increase the power of the engine like intake system or fuel injection performance kits (costs around $500)?

[I FLEX]

Originally Posted by 5jeep

Hi Jerry,

I appreciate your suggestion, do you know where I could regear my axels?

I also wanted to know instead of regearing the axels can i install any engine performance enhancer to increase the power of the engine like intake system or fuel injection performance kits (costs around $500)?

You could but it wouldnt make enough of a difference. Lets say that you could get 25-35 extra Horse Power out of Chip, air intake, header, and exhaust mods thats probably shooting kinda high it would proabably be like 15-25 HP. That would not compensate the engine bogging from 33's. You would need the HP difference that you could get from the V6 engine, about 75-90 hp difference i think The re-gear doesnt really give you more power but changes the RRM range for all your gears. You tend to run a higher RPM which would essentially increase gas consumption. It would be less noticeable if you have a manual rather than a automatic.

Im kinda in the same boat as you. I will be in the market for new tires and i currently have 31's. I want to get 33's but i cant afford to regear and i know the engine mods are kinda a waste. I dont want to re-invest in 31'sn so i might just get some 32's which meets my needs and wants the best. BFG MT's and Goodyear MTR's both come in that size too.

Hope this helps.

[5jeep]

I originally wanted to install 33"tires but found out its not safe for a 2.4L. So now I am debating if I should go for 31"or 32"? any suggestions?

Originally Posted by I FLEX

You could but it wouldnt make enough of a difference. Lets say that you could get 25-35 extra Horse Power out of Chip, air intake, header, and exhaust mods thats probably shooting kinda high it would proabably be like 15-25 HP. That would not compensate the engine bogging from 33's. You would need the HP difference that you could get from the V6 engine, about 75-90 hp difference i think The re-gear doesnt really give you more power but changes the RRM range for all your gears. You tend to run a higher RPM which would essentially increase gas consumption. It would be less noticeable if you have a manual rather than a automatic.

Im kinda in the same boat as you. I will be in the market for new tires and i currently have 31's. I want to get 33's but i cant afford to regear and i know the engine mods are kinda a waste. I dont want to re-invest in 31'sn so i might just get some 32's which meets my needs and wants the best. BFG MT's and Goodyear MTR's both come in that size too.

Hope this helps.

[ajmorell]

It doesn't technically have anything to do with the motor itself. It has everything to do with the transmission and axles through which the power is sent through. You could run 35" tires on a 1.6L Honda Civic engine if you had the axles properly geared without causing any damage to the engine itself.

[BlaineWasHere]

If you gear the axels down to 4.56 or 4.88 you will be fine.

[terrible]

You can do it but it is tedious at times. Right now I run 33" buckshots on my 2.4L se with 4.11's and it doesn't do too bad. allbeit I'm not winning any races or pulling any trailers but it does great in the mud and still gets about 18 mpg.

If I had it to do again I'd do it the same way. If I had more money ,sure I'd re-gear but if I had more money I'd have a rubi in the 1st place

[alwaysready]

like mentioned you can do it but youll need to regear. we all go through that big step in modiying at one point or another. youll be happy you regeared when your done otherwise it will be a slug

[Rubiconkidd45]

So I can run 33's on my yj 2.5 and i'll b fine!!!
I heard of the same thing. some people even tell me to sell the 2.5 and get a 4.0

[Jerry Bransford]

Originally Posted by 5jeep

Hi Jerry,

I appreciate your suggestion, do you know where I could regear my axels?

I also wanted to know instead of regearing the axels can i install any engine performance enhancer to increase the power of the engine like intake system or fuel injection performance kits (costs around $500)?

Nearly any 4x4 shop can regear your axles which averages $1200 total.

No, things like new intakes, FIPKs, etc. are just gimmicks and they aren't what is needed to restore the performance lost from installing bigger tires. They won't help in the least. Don't waste your time with them, regearing is the correct method for restoring your lost power. 4.88 is what you want in your axles for your four-banger and 33" tires.

[Jerry Bransford]

Originally Posted by 5jeep

Hi Jerry,

I appreciate your suggestion, do you know where I could regear my axels?

I also wanted to know instead of regearing the axels can i install any engine performance enhancer to increase the power of the engine like intake system or fuel injection performance kits (costs around $500)?

Nearly any 4x4 shop can regear your axles which averages $1200 total.

No, things like new intakes, FIPKs, etc. are just gimmicks and they aren't what is needed to restore the performance lost from installing bigger tires. They won't help in the least. Don't waste your time with them, regearing is the correct method for restoring your lost power. 4.88 is what you want in your axles for your four-banger and 33" tires.

[Jerry Bransford]

[

Originally Posted by 5jeep

Hi Jerry,

I appreciate your suggestion, do you know where I could regear my axels?

I also wanted to know instead of regearing the axels can i install any engine performance enhancer to increase the power of the engine like intake system or fuel injection performance kits (costs around $500)?

Nearly any 4x4 shop can regear your axles which averages $1200 total.

No, things like new intakes, FIPKs, etc. are just gimmicks and they aren't what is needed to restore the performance lost from installing bigger tires. They won't help in the least. Don't waste your time with them, regearing is the correct method for restoring your lost power. 4.88 is what you want in your axles for your four-banger and 33" tires.
QUOTE=5jeep]Hi Jerry,

I appreciate your suggestion, do you know where I could regear my axels?

I also wanted to know instead of regearing the axels can i install any engine performance enhancer to increase the power of the engine like intake system or fuel injection performance kits (costs around $500)?[/QUOTE]