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Best performance upgrades for a 2015 Unlimited... All help will be greatly appreciated!
 

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Depends on how you define performance..
My best upgrade was a lift and suspension. Really improved the Jeep's off-road performance.
 

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So superchargers not helpful or not worth the money?
If you can find one for your model year that actually works, it would be about the only thing that would actually give you more HP.. It'll cost you a few bucks though.. I can't imagine why you would want or need it, but, it's your $$ to use as you wish.
 

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Discussion Starter #7
Alright... Thanks for the help dude been wondering if it was worth it or not... Thanks once again
 

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A HEMI is the only HP upgrade worthwhile IMO, got 20k?
 

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Think of it as trying to tune up a sewing machine :)

Not much there to improve upon...

Jeep could really, REALLY increase their sales with a bit more oomph - but since they sell everything they build now, and they hold value, changes might entail building more robust other parts, tranny, etc....

our lil sewing machine is all we got :(
 

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No one can really tell you whether a performance modification is "worth it", or which is the "best" for you. You have to research and do the cost/benefit analysis yourself based on your preferences, desires, budget, etc.

Simple bolt-on mods (air intake, exhaust, performance tunes) give some gains. For example: http://www.wranglerforum.com/f274/banks-dyno-day-326377.html

Will it shove you in your seat and make you feel like you're driving a high-performance vehicle? No. Is it noticeable? Probably. More likely it is changes in part-throttle performance and sound that you'll "feel" more than absolute gain in peak torque/power. Will it be "enough" for you and "worth it"? Only you know the answer, and you might not be able to decide until after spending the money and trying it.

There are several supercharger options: RIPP, ProCharger, Magnuson, Edelbrock, Sprintex. They vary in type of supercharger, price, gains in peak torque/power, shape of torque/power curves, ease of installation, etc.

There's turbo kits from Prodigy Performance, with a range of options and cost.

The supercharger/turbo kits are generally in the $5k-$7k price range. Installation is generally in the $1k or less range, or can be done in your driveway over a weekend if you are a competent DIYer with a friend to offer a pair of helping hands (mostly basic bolt-on modifications with some minor trimming/cutting of plastic).

Then there's the Hemi and LS engine conversions with a range of engine sizes and pricing available. Most people would agree that the smaller V8 conversions (like 5.7 Hemi) are not enough of a gain in performance compared to the 3.6 Pentastar to be worth the high cost. These conversions can cost anywhere in the $15k-$30k+ range. Then there's bolt-on supercharger and turbo options available for some of these engines to take it even further. Check out Bruiser Conversions and MoTech for examples. Beware that most V8 conversions quote *engine* horsepower/torque, whereas most supercharger/turbo kits quote *wheel* horsepower/torque.

Be careful about incorrect generalizations when comparing between superchargers and turbo. You'll often see claims like "turbos only make power at high rpm, and superchargers make power at low rpm". Well... that's kinda correct, depending on specifically which supercharger you are comparing to, and what you consider "low" and "high" rpm. Centrifugal superchargers are actually more biased toward high rpm than turbos, and turbos have some pretty big mid-rpm gains.

Beware of claims that there's no reason to go with a supercharger/turbo because a Hemi conversion costs about the same. It is true that you can purchase a V8 conversion kit for about the same as a supercharger/turbo kit. But the V8 conversion kit does not include the engine or several other components. It only includes the custom parts needed to put a V8 in a Wrangler. Installation is also a major undertaking for a V8 conversion: ~40 hours for an experienced mechanic with access to proper tools, requires welding new engine mounts to the frame, etc.

Be careful when comparing torque/power gains between different performance mod options, because numbers may have come from different types of dynos. Focus on *relative* changes from stock (% gains) and overall shape of the curves, rather than specific hp/tq numbers.

Also beware of fallacies like "you spend most of your time driving below 3000 rpm, so that's where you need more torque". Think about it: if you're cruising around below 3000 rpm, you have as much torque as you need already because you're only maintaining speed or gently accelerating. What happens when you push the pedal down to accelerate faster? The transmission downshifts and rpms increase. The mid/upper rpm range is actually where you'll experience most benefit from gains when you actually need to accelerate quickly (passing, accelerating onto freeway, etc).

And if you have a manual transmission, never drive above 3000-4000 rpm even when trying to accelerate quickly, and complain that you "need" more low end torque for "passing power", then you're doing it wrong. The Pentastar has 6400 rpms. Use them. That's not to say that more torque at lower rpms wouldn't be nice/useful/enjoyable for more responsive throttle without needing to downshift. Just don't allow yourself to be deceived into thinking that low rpm torque is the only thing you "need" and that you will rarely/never benefit from higher rpm gains. If you never use the upper rpms of the stock Pentastar, then you're not even experiencing the full potential of the engine yet. It doesn't make sense to spend money on adding more when you're not even making use of what you already have.

It makes even less sense when people with an automatic transmission talk about the need for more low rpm torque for passing power because they never exceed 4000 rpm. They must be intentionally holding back on the pedal to avoid the higher rpms. Push the pedal more if you want to accelerate faster :)
 

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Best performance upgrades for a 2015 Unlimited... All help will be greatly appreciated!
A Magnuson? blower kit is available for late JKs, but then I wonder how well it would work, as I just read that the exhaust header is part of the maniforld. (if I understood that correctly), so . . . ?
 

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Yes, the 3.6 Pentastar has its header cast directly into the head. Why would this prevent a supercharger from working well?

There's dyno results out there for several supercharger (and turbo) options for the 2012+ Wrangler. No need to speculate based on head design.
 

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