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Old 05-28-2014, 04:50 PM
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Cool Intake and exhaust upgrades.

I am looking into performance intake and exhaust upgrades. As an old biker, this has always been a reasonably priced performance enhancement. What kind of boost can you expect from these mods? Any strong brands to consider?

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Old 05-28-2014, 05:10 PM   #2
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What for? If it's the 3.6 in the 2014 Wrangler you can get a slight boost with an aftermarket air filter and I'm sure someone makes something for the exhaust. Being the exhaust manifold is cast with the head, I wouldn't expect much gain on that side. You would probably get the biggest bang for the buck with an aftermarket chip but that may cause some warranty issues. You could throw an aftermarket supercharger on it but those aren't exactly cheap.

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Old 05-28-2014, 06:57 PM   #3
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Good question, iv had this one too! But according to my research the best sounding (and maybe performance) exhaust system is the banks monster system. I want to say it runs $250! As far as intake idk, im saving for a snorkel
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Old 05-28-2014, 08:03 PM
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I have always used K&N filters and noticed nice improvements. Not sure about this Pentastar engine though. The principal of cooler, more dense air creating better combustion and detonation is pretty straight forward. And if Jeep is like any other automaker, their exhaust is tuned down to meet emissions in the strictest state. My instincts tell me that there is an easy 30 horses to pick up here.
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Old 05-28-2014, 11:23 PM   #5
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The 3.6L engine isn't a Twin Cam.

You will get more engine noise and no independently certified performance upgrade. Trying to get 30 more horsepower out of a 231ci V6 engine already at 275 hp isn't doable with several hundred dollars of aftermarket parts.
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Old 05-29-2014, 12:37 AM   #6
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The 3.6L engine isn't a Twin Cam.

You will get more engine noise and no independently certified performance upgrade. Trying to get 30 more horsepower out of a 231ci V6 engine already at 275 hp isn't doable with several hundred dollars of aftermarket parts.
this. and the fact that a K&N is the single worst thing you could do to a modern engine besides run it under water
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Old 05-29-2014, 07:17 AM
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Sounds like Tweak has had a bad experience with K&N filters. Or are you opposed to the concept of filters with increased surface area and less restrictive airflow in general?

I have never rebuilt nor even worked on a Pentastar engine before, but my experience with other makes leads me to think that simply remapping the ECU is worth about 15 horses. I could be wrong but
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Old 05-29-2014, 09:04 AM   #8
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Originally Posted by HARLEYDAWG01 View Post
I have always used K&N filters and noticed nice improvements. Not sure about this Pentastar engine though. The principal of cooler, more dense air creating better combustion and detonation is pretty straight forward.
Cooler air always helps. Unfortunatly all the CAI's for Jeeps pull air from the same place as stock, under the hood where it's nice and warm.

K&N's are less restrictive because the filter material is not as fine, they can flow more air, because they do not trap as much dirt, which gets into your engine.
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Old 05-29-2014, 10:25 AM   #9
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Unless you have a military Rotax engined HD, a K&N filter is fine for a street motorcycle.

A K&N filter is not the best air filter for an off road vehicle. It is too porous and allows larger diameter particulates to be ingested. Longevity is going to be a factor. Most Harley motors will never see 100,000 miles in their lives. Jeep engines should see well beyond that.

A 'cold air' intake is simply marketing. There is no cold air going into the engine unless you are in cold weather and then it is simply ambient air. Unless you are going to somehow refrigerate the ambient air supplied to the engine, there is no 'cold air' to boost into realized HP ratings. When the vehicle is being driven, ambient air flows into the engine compartment and displaces the hotter air in proximity to the engine. This negates the basic concept of the CAI on a non-race engine.

There are tuners out there and they deliver mixed results. None are delivering dyno proven horsepower and torque increases. Again, the 3.6L engine is not a Twin Cam and it cannot be 'flashed' with a factory approved software program to bump up deliverable results.

A Twin Cam from the factory makes about 0.78 HP per cubic inch. A 3.6L makes 1.2 HP per cubic inch. The Twin Cam has far fewer controls and engine variables to deal with. The Chrysler engine has a more technically demanding set of variables - air conditioning, auto transmission, CANbus control system, water cooled engine, higher compression ratio [11:1], etc.
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Old 05-29-2014, 11:38 AM
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Thanks 2five. I put 135,000 miles on my Expedition with a K&N and it was running strong when I traded it in. I may be different than most as I cleaned and oiled my filters regularly. BTW I am not comparing a twin cam engine to this Pentastar. I have 88,500 on my Harley with a K&N and will double that before I trade her.

So your opinion is that this engine is maxed out? If so... Congratulations to Jeep for being the first manufacture in the history of the automobile to release an engine that cant be enhanced. Guess I better save up for a Hemi conversion. Or better yet the Cummins turbo diesel !!!!! LOL

Thanks for weighing in.
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Old 05-29-2014, 02:05 PM   #11
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I have a CAI (K&N) and Gibson exhaust. I spent about $200 for both and will probably never make that money back in performance benefits. My jeep sounds louder and there might be an increase in hp or MPG, but not enough to measure or add up to anything to write a letter to my mom about.
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Old 05-29-2014, 03:25 PM   #12
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BTW I am not comparing a twin cam engine to this Pentastar.
Your previous assertion from yesterday: "My instincts tell me that there is an easy 30 horses to pick up here."

You are when you believe that because a Twin Cam can be re-flashed to provide better performance, the identical equivalence can be done to a 3.6L Chrysler. It is not a tautology.

(A<-->B) --> ~(A --> t)

No internal combustion engine ever made is 100% efficient. The higher one goes in reaching thermodynamic efficiency, the rate of material failures also increases.

Outliers as examples of majority results are not valid exemplars.
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Old 05-29-2014, 03:42 PM   #13
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Throw on a Diablosport or Superchips tuner is my advice. At least, I'm happy with the throttle response and shifting on my 2013 with a fairly mild "canned" tune. The 3.6 just doesn't make much of the mechanical mods currently available for it, save a blower or regearing. Yes, you may get something from an intake and exhaust on a dyno sheet. For me at least, the cost/power ratio isn't worth it. Now, if someone offered a nice cam package for it, then there might be some additional merit to intake/exhaust mods.
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Old 05-29-2014, 05:36 PM   #14
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Simply put, there isn't much you can do to the 3.6 for farily cheap.

A CAI on a Wrangler is basically uesless. As already pointed out, they are not even "Cold Air" intakes....they should be called WAI's on the Wrangler.

And to get the most out of it, you would need to do a tune and exhaust as well. Even then, you may only see a small bump in actual power to the wheels. Most of the improvement would come at RPM's you don't spend much time at anyway because the Wrangler is nothing more than a rolling brick. The tune/chip might help, but you are talking possible warranty issues, especially when coupled with a CAI.


Save your cash....

BTW, I went UNI (instead of K&N) for my bike...
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Old 05-29-2014, 08:00 PM   #15
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Quote:
Originally Posted by HARLEYDAWG01 View Post
Sounds like Tweak has had a bad experience with K&N filters. Or are you opposed to the concept of filters with increased surface area and less restrictive airflow in general?

I have never rebuilt nor even worked on a Pentastar engine before, but my experience with other makes leads me to think that simply remapping the ECU is worth about 15 horses. I could be wrong but
no, I am opposed to putting parts into my engine without first doing research.

Air Filter Filtration Test - Bob is the Oil Guy - Bob is the Oil Guy

there is also the fact that a tiny 3.6l engine with an already massive OEM filter will see no benefit of "increased surface area" unless you are running it at the very top of its RPM range, and who does that?
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Old 09-01-2014, 12:03 AM   #16
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no, I am opposed to putting parts into my engine without first doing research. Air Filter Filtration Test - Bob is the Oil Guy - Bob is the Oil Guy there is also the fact that a tiny 3.6l engine with an already massive OEM filter will see no benefit of "increased surface area" unless

you are running it at the very top of its RPM range, and who does that?
The aftermarket filters do almost nothing good--even for large displacement, air-gobbling Diesel engines. Don't believe that? Take a look at this research:
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Old 09-01-2014, 12:15 AM   #17
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Read that report and bookmark it, as it will probably be deleted quickly, as it effectively kills CAI sales... It's not unique, either. Folks who build performance engines professionally know that oem filters aren't a performance impediment until very significant changes are made to the engine--and such modifications don't make sense of these little jeep engines. Folks who want hot rod jeeps ought to just pony up for a v-8 motor swap, as that really does improve performance, and you have some chance of getting some of your investment back on the other end. (Not much, mind you, but ten cents on the dollar, is better than spending a few thousand dollars on tunes, headers, spacers, cold air kits and exhaust only to realize no improvement in performance and get NONE of your money back:http://www.dieselplace.com/forum/3-p...they-work.html

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