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Old 03-19-2015, 10:11 PM
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pentastar upgrade

I will be in the market for a new vehicle in the next few months and have been researching the Grand Cherokee. I see from multiple sources that the pentastar engine will be upgraded for the 2016 model year. Some sources say there will be a turbo, while others say there will be direct injection and other small changes. Does anyone know what the upgrades will be? Also, will the Hemi see similar upgrades?

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  #2  
Old 03-19-2015, 10:29 PM
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Re: pentastar upgrade

Quote:
Originally Posted by malba2366 View Post
I will be in the market for a new vehicle in the next few months and have been researching the Grand Cherokee. I see from multiple sources that the pentastar engine will be upgraded for the 2016 model year. Some sources say there will be a turbo, while others say there will be direct injection and other small changes. Does anyone know what the upgrades will be? Also, will the Hemi see similar upgrades?
I don't know, but personally, I'd prefer port injection over direct.
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Old 03-20-2015, 10:18 AM
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Re: pentastar upgrade

Jeep Grand Cherokee WK2 - future Jeep information says the 2016 Wrangler is also getting the updated 3.6L Pentastar and production of that model will start July 13, 2015, which is almost five months before 2016 GC production is due to start. This suggests we should be getting more info about the new engine pretty soon. If nothing else, the order banks should open a month before production starts, so that would be mid-June.

This Automotive News article seems to be the main source of the rumors/info on the new engines. I haven't seen much that goes beyond that.
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Old 03-20-2015, 12:04 PM
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Re: pentastar upgrade

From what I have read previously, the Pentastar and Hemis will be getting direct injection and a version of Fiat's MultiAir, giving them a 10% increase in hp and torque, along with a similar gain in fuel efficiency.

Personally, I like the old reliable port fuel injection. If the past experience of other manufacturers is an indicator, I would expect the first generation to have teething issues, some of which won't be apparent until they get up in mileage, like excessive carbon build up on valves.

I imagine the new engines will be great. A 400hp/425ftlbs 5.7l MultiAir Hemi with the fuel economy of the current Pentastar or a Pentastar with the fuel economy close to the diesel sounds awesome.
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Old 03-20-2015, 02:42 PM
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Re: pentastar upgrade

Im in the same boat as him. I am wanting to change from my Charger RT to a Grand Cherokee.
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Old 03-20-2015, 04:19 PM
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Re: pentastar upgrade

I would bet they will follow the current trend of twin turbo small displacement engines in the future, with increasing average fuel economy demands from the government it's the easy way out.
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Old 03-21-2015, 09:31 AM
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Re: pentastar upgrade

Direct injection has been a big problem for a lot of German auto makers. Without gas washing over the intake ports and valves, they eventually become caked with carbon that has to be blasted off with crushed walnut shell media. For a BMW the cost is $800 to $1,000 because you have to remove the intake manifold. Lexus fixed the problem with a small port injector that washes oil residue from the crankcase oil vapors off the intake ports and valves. Also a lot of car companies have had trouble with turbo charged engines in the beginning of the production runs. Personally, the V-6 with 290 HP is enough for me. The extra power from a turbo charged engine isn't worth the maintenance cost and possible headaches from the extra complexity of the turbos and the stress on the engine caused byde the heat generated by turbo charging. After my experience with BMW's gas turbo charged engine, I'd rather stick with a naturally aspirated engine.
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