like I said unless you get force induction no way you can get more than 10hp increase. you butt dyno wont tell the difference.
some poorly designed air intakes not only sucks hot air reduces power but also passes dirt causing engine failure.
short of forced induction, there is nothing that will give you 20-30 more HP on the 2.5
before looking to add more power, make sure it is already running right. a good tune up, etc will do lots for any vehicle that is running rough. if you are having issues making power, there could be other things wrong. a clogged up catalytic converter can cause issues, there are several things you should look at before you think about bolting on a bunch of "go fast" mods. most of which will be useless any ways.
I have a buddy with an all-stock 2.5L TJ that will top 100 mph. pretty easily. I don't recommend it, but I've seen him do it.
Ironic, isn't it? Whomever installed headers, trick exhaust, big tires, stickers, tint, fuel magnets, etc. probably insisted that it was an improvement.
2.5's are not asphault-ripping terrors in any form. It probably ran a lot better before the original equipment was removed.
I agree with most everyone here. I have a 2.5 and I'm fine with it.....70 on the freeway is okay with me....I like to take in the scenery. But if you want more ponies jack up the radiator cap and slide a HEMI under there.......or maybe nitrous (can the 2.5 handle nitrous?) Or sell it and get a 6 cyl.
it take me everything my jeep has to get to 65, if i hit a hill im down to 55 or less, cant sell it and get a inline 6 i'd rather pull it and make it better
im not looking for a 240sx, just my jeep to be able to get the **** up and move when i need it too
give it a good tune up, wouldnt hurt to run some of that fuel injector cleaner/tank stabilizer stuff through either. see how it runs after that. if its still sluggish, pull the catalytic converter out(there is a way to check and get an idea if its clogged, i just dont remember how) if its clogged up, replace it.
and if your header is cracked, it might be a good idea to either fix or replace it.
as far as a tune up goes, you can buy tune up kits, or buy each part separately. just depends on how you wana do it.
another thing to look at is performance catalytic converters. how ever this is not for a performance gain, in some cases they are just cheaper then a stock replacement.
Ok, believ it or not, fix your exhaust leak. I have seen the 2.5 have huge power robbed by seeming minor exhaust leaks. Do some searches and you should see it.
Also, 4.10 is NOT enough gear for a2.5 with 31s. Remember, the 2.5 is no champ on the highway with stock tires that were 4" smaller. 4.10s are manageable, but you should expect a significant performance drop.
The 4cyl is fine in he trails because you use the low range, but on the highway you are underpowered.
if they were that incredibly unreliable, then the majority of new cars wouldnt come with them from the factory. its just one of those situations where you get what you pay for, if you buy a cheapo knock off fan, then chances are very good that it will perform poorly. lots of people seem to be happy running electric fans. you just dont hear about it like you do the horror stories
if i should throttle body spacer on it for a few mroe HP if not more response time
if i should put a cold air intake on it just b/c the stock box is crappy ( there is no way i can beleive that a air intake that is open is worse then stock box)
if my engine is slugged up is there any way to help with that
i put ALOT of miles on my jeep
and from my undersstanding my acceleration is slwo b.c of my gears not b/c of the engine
as far as headers go, its kind of a waste of money. just find a good replacement.
skip the throttle body spacer, it will do nothing but sit there and remind you that you threw money down the drain.
keep the stock air box. the cold air intakes you are thinking of are not actually cold air intakes. in the ricer world they are called short ram intakes(or something like that, been a while since ive been there) another issue with those intakes is they dont deal with dust as well as the stock on. you run a higher chance of pulling in things you dont want in the engine. just because you have a bigger opening for air to get to the throttle body, does not mean you can use that. all the info i have found points to the jeep stock intake flowing all the air a stock engine needs.
as far as a sluggish engine. TUNE UP! inspect and replace the cat if necessary and check the o2 sensors, etc. make sure its all running right before you go dumping money products that will not give you the results you want.
while 31s are bigger then stock, the 4.10s you have stock are about as good a gear as it gets. 4.56s might be nicer, but is it worth the roughly $1000 to put those gears in?
2.5L will never be a powerhouse, no matter what you throw on, in or at it.
Regearing will help you, but don't expect miracles.
Stay away from those 'Gimmick' plugs....
I'm running 31x10. on my 2.5 and can easily do 75 and just down shift if i hit a hill thats to steep. Ive just made sure to have mine tuned up whenever i need it. i changed the plugs a few months ago and that made a huge difference on how it ran!
awesome, after reading the beginning of this thread i was feeling like i shouldnt put on 31's, snapped right back into save up mode. 31's and 4'lift ftw
awesome. and now i know what im having for dinner. unk:
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Ask a question
Ask a question
Jeep Wrangler Forum
9M posts
468K members
Since 2005
A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models!