LOL...really? Your going to turn a 105 (carb)-115 (fuel injected) hp motor into a "powerhouse" with airflow? 5 lawn tractors out horse power a 2.5. First of all, it's 112hp for a CJ 2.5L engine. We're in the YJ section, we are talking about the TBI 2.5L engine which has 117hp factory, the MPFI engine has
120hp factory. Netting 5hp is absolutely going to change how the engine behaves, especially going uphill. You're taking a 117hp engine and adding 5hp to bring it up to 122hp. That's already ahead of the MPFI engine. Allowing an engine to breathe better is the first thing that should always be done, and yes it actually improves performance numbers!!!! Take a look at many ATV's: Most of the newer ones come with a closed intake system that breathes trough the upper support tube and lets air
in front of the tank. Slap on a Yosh or Motowerks exhaust and you should expect as much as 6hp right? Yes, but no. Not until you open up your intake by removing the airbox lid and installing a high flow air filter. Airflow is a 2 way road with engines. You can put the biggest air filter you can find on the intake, but that doesn't mean jack if it can't send that increased airflow out through the small volume exhaust vehicles are equipped with. And visa versa. It takes a high flow air
filter AND a performance exhaust system to net HP gains. An exhaust itself may only add 5hp-ish but to see the real benefit of added airflow you have to ditch the stock, restrictive airbox for an aftermarket intake system that really lets the engine breathe. As for the 20-25 hp number, that is a load of bunk!!!! If you converted to the 4.0 throttle body, you may get "minimal gain" and it's apparently an easy bolt on conversion and I believe it uses the same sensors.
Since the throttle body is larger diameter it will allow more air into the engine. Seems you forget that the 2.5L engines are equipped with a 6lb metal fan that literally SUCKS horsepower away. EVERYONE that has done the electric fan upgrade has reported better throttle response, more power on the highways, a quieter ride, and even dyno sheets have shown it can free up as much as 10hp. I've seen some go as far as 15hp, but realistically you're looking at netting about
10hp. So, coupled with the exhaust system, you're already looking at a 15hp net in power. 15 hp is a LOT of power for a small 4 cylinder engine. You're going from having to downshift out of 5th going up freeway grades to now being able to cruise up that same grade in 5th gear. I have a 09 Mustang with 20,000 miles that had 200 hp when I started. I went from single exhaust to dual exhaust, added a CAI, and tuned it and I "may" have gotten 25 horsepower gain. There is NO
WAY you will gain 1/5th the horse power from the mods you described. Totally different vehicle, totally different aerodynamic properties, totally different engine. Apples to oranges. Next. Definitely weigh the cost versus the gain. In 2002 when they stopped using the 2.5, they were multi-port fuel injected and still only had 120 hp. Not everyone wants to go through and put in a 6 or 8 cylinder engine. 2.5L Jeeps are
inexpensive and a dime a dozen. Some people report finding them for $2000 or less, and needed only a little basic maintenance to be running like new (because the PO's are idiots when it comes to cars). The power modifications I am talking about would cost one anywhere from $500-$1000. Still less expensive than an engine swap. Keep in mind for a (legal) engine swap you need: -Engine All of
which can add up depending on where you find the engine, what condition it is in, the transmission and its condition, pricing for a smog referee to inspect your work and approve it, not to mention passing emissions testing. Realistically, it's $1500 or more, even if you did manage to pickup a wrecked vehicle.
I bought a Walker today. Cost me $46 out the door. You don't need to drop in a 6 or 8 cylinder engine when you can spend a little money and upgrade what is already there. Here is a list of parts that have been PROVEN to gain hp numbers on the dyno: 1987-1990 -High flow air intake. Max total HP gains: 30hp 1991-1995 -High flow air intake. I wouldn't expect you to know that, someone who puts off the 2.5L immediately and sees it as a boat anchor and instead looks at an engine with 2 more cylinders and immediately thinks "This is the clear winner at everything". Going up steep grades perhaps when comparing stock to stock, but when you do some simple upgrades to a 2.5L engine you'd be surprised at just how well it can pull, even with 33" tires on the stock 4.10 gears. |
1995 jeep wrangler 2.5 exhaust system
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