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Old 04-25-2013, 11:59 AM   #1
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Varying power of 3.6 Pentastar?

If you google Pentastar you get a list of all the cars that are currently using the 3.6 and it seems that the Challenger is pumping out an additional 20hp over our Wranglers.

So how do we bump our power? What is different between the two engine setups that it is making 20 more hp? Is it software only? I don't think it can be just intake and exhaust since the factory setups are usually very restrictive to start?

Is it cams? Maybe different head profile? Anyone here know?

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Old 04-25-2013, 12:01 PM   #2
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Originally Posted by Beardacus View Post
If you google Pentastar you get a list of all the cars that are currently using the 3.6 and it seems that the Challenger is pumping out an additional 20hp over our Wranglers.

So how do we bump our power? What is different between the two engine setups that it is making 20 more hp? Is it software only? I don't think it can be just intake and exhaust since the factory setups are usually very restrictive to start?

Is it cams? Maybe different head profile? Anyone here know?
Different tuning. Different exhaust setups.

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Old 04-25-2013, 12:33 PM   #3
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I also think there are different intake manifolds. I think there is one for the Jeep, a different version for the cars, and a different version for the trucks.
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Old 04-25-2013, 12:46 PM   #4
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all that excess hp is only attainable in higher rpm anyways.
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Old 04-25-2013, 12:47 PM   #5
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My wifes friend has a Charger... The Charger is an auto and my Jeep is a stick, but it feels like it has a ton of extra flywheel weight compared to the car. Even if the power were the same, it makes it feel way different.

Jeep revs slower, but the weight also makes it easier to keep going at low RPM without stalling.
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Old 04-25-2013, 12:51 PM   #6
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Comparing HP from vehicle to vehicle doesn't mean a lot w/o also looking at torque and gearing.
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Old 04-25-2013, 12:55 PM   #7
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I don't know where you guys are going in such a hurry. These Pentastars have plenty of power for a Jeep. You have to trust the Mopar engineers at some point, eh?
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Old 04-25-2013, 01:01 PM   #8
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True, it's relative to weight, over the same distance in a relative time.
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Comparing HP from vehicle to vehicle doesn't mean a lot w/o also looking at torque and gearing.
The JK is tuned for low end torque, it's all the above mentions, also realize the other engines are adapted to Flex Fuel. There are several differences that wouldn't work on your JK. But I agree more is more, and I'm a HP junkie/torque Junkie too. With this motor as mainstream as it is a supercharger or a stroker motor would be sweet. A nice crank, con-rod, piston and head set with some intake/exhaust manifolds.

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Originally Posted by Beardacus View Post
If you google Pentastar you get a list of all the cars that are currently using the 3.6 and it seems that the Challenger is pumping out an additional 20hp over our Wranglers.

So how do we bump our power? What is different between the two engine setups that it is making 20 more hp? Is it software only? I don't think it can be just intake and exhaust since the factory setups are usually very restrictive to start?

Is it cams? Maybe different head profile? Anyone here know?
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Old 04-25-2013, 01:19 PM   #9
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I don't know where you guys are going in such a hurry. These Pentastars have plenty of power for a Jeep. You have to trust the Mopar engineers at some point, eh?
It's not necessarily about being a hurry, its about tinkering. I have modified all my cars and sometimes small bolt on things can produce great results. It's also curiosity as well.
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Old 04-25-2013, 01:22 PM   #10
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True, it's relative to weight, over the same distance in a relative time.

The JK is tuned for low end torque, it's all the above mentions, also realize the other engines are adapted to Flex Fuel. There are several differences that wouldn't work on your JK. But I agree more is more, and I'm a HP junkie/torque Junkie too. With this motor as mainstream as it is a supercharger or a stroker motor would be sweet. A nice crank, con-rod, piston and head set with some intake/exhaust manifolds.
If you google pentastar a lot of info comes up about turbo and sc kits that will be produced for this engine and offered as factory options. Even if it is never released for the JK (which I think there is a possibility) imagine how easy it will be to get one down the line? Idk about you but I would love an easy bolt on SC for my JK.
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Old 04-25-2013, 01:24 PM   #11
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also, take into consideration the weight/hp ratio and as you bolt on upgrades which weigh the vehicle down and add more lights which also draw power from the engine, those 285 horses are now pulling a locomotive instead of a carriage.
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Old 04-25-2013, 02:21 PM   #12
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A big reason: The computer tune

Its well known with many manufacturers that they must dial down car performance to make higher models worth the price. This was the big controversy a few years ago between the less expensive porsche cayman and the same engine, better performance, much more expensive porsche carrera.

Chrysler would feel pretty stupid if its 'sports' cars weren't any faster than its big SUVs. Since the days of having a different engine developed for each car are long gone, using the computer is a way of differentiating the performance.
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Old 04-25-2013, 03:18 PM   #13
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A big reason: The computer tune

Its well known with many manufacturers that they must dial down car performance to make higher models worth the price. This was the big controversy a few years ago between the less expensive porsche cayman and the same engine, better performance, much more expensive porsche carrera.

Chrysler would feel pretty stupid if its 'sports' cars weren't any faster than its big SUVs. Since the days of having a different engine developed for each car are long gone, using the computer is a way of differentiating the performance.
Same thing with Camaro's with the LS1 and the Corvette's. Same engine big difference in power.
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Old 04-25-2013, 03:26 PM   #14
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I've taken off from stop lights with a few new chargers and have beaten them both. The chargers, I believe are 292hp and are about 200lbs heavier than my 2 door Wrangler, so that extra 7hp (which is nothing) was not enough to compensate for the additional weight. I had a modded 300C and after an intake, exhaust and a Predator tune the thing was a beast. I'm definitely thinking of getting a Diablosport tuner for my Jeep now that they have been released it will really wake the Jeep up adding at least 15hp to the wheels and freeing up the torque. There is also a setting that gets rid of the throttle lag to give you back that instant feeling of acceleration. There are also tons of other features on the tuner that negates the need for a pro-cal.
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Old 04-25-2013, 04:59 PM   #15
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Quote:
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It's not necessarily about being a hurry, its about tinkering. I have modified all my cars and sometimes small bolt on things can produce great results. It's also curiosity as well.
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Old 04-25-2013, 06:05 PM   #16
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Every manufacturer does that my, Yamaha FZ1 has an R1 based engine but makes about 40 hp less out of the box. Smaller airbox/intake,heavier cams and crank,lower redline, tuned back ecu. Guys have the FZ pretty well figured out and are now putting down stock R1 numbers with their modded FZ's. Not bad for a non supersport and isurance is half the price.
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Old 04-25-2013, 07:12 PM   #17
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Jeep changed the intake runners to provide more low end torque at the expense of a few ponies. Horsepower isn't as big a help in off-roading as is low RPM torque, so they specifically tuned the engine for this purpose.

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