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  #85  
Old 05-08-2013, 12:19 PM
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Originally Posted by Jeff_H2O View Post
I always thought the same thing. Most people say using 89 or 93 octane is just a waste of money. But I think it must do something... if not more MPG's, isn't it at least better for the engine? Higher Octane = Less preservatives = cleaner engine = longer lifespan?

To me, if I am spending $48k on a car, what's an extra few dollars gonna hurt at the gas tank? (extra 10 cents per gallon).
If anything it would actually hurt the engine because the higher octane will cause it to burn incompletely, causing carbon buildup. Every make and model of car is different but if it is designed for 87 you are throwing money away by going higher plain and simple. Every vehicle I have owned. Have tried 89 in just to see if the ecu could adjust to it and have gotten considerably less mpg's because of it.
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  #86  
Old 05-08-2013, 12:59 PM
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Re: 2014 V6 owners - how do you like it?

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Originally Posted by loveracing1988 View Post

If anything it would actually hurt the engine because the higher octane will cause it to burn incompletely, causing carbon buildup.
I was never taught that in shop class. Using higher octane fuel won't hurt you motor, but using a lower octane fuel than what is recommended for your engine could cause "pinging" and loss of power.

Octane rating only relates to how much a fuel can be compressed before igniting. The higher the number, the less likely it is to ignite under pressure.
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  #87  
Old 05-08-2013, 01:21 PM
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Re: 2014 V6 owners - how do you like it?

Of course higher octane doesn't hurt engines. All high performance engines that rely on higher compression (9-10:1 or turbo engines that have high compression under load) or high revving ones require premium octane.

But unfortunately in this country the mindset still is "there's no replacement for displacement". Really, there isn't but high compression and turbo are perfectly acceptable means to mitigate the reduction in cylindric capacity and the benefits that come with that (better fuel economy, reduced pollution, reduced weight).
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Old 05-09-2013, 03:06 AM
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Re: 2014 V6 owners - how do you like it?

In terms of regretting the V6 vs. the V8, are there any other differences in the models? In other words, if I bought a '14 3.6 Summit vs. a 5.7 Summit, would they be the identical vehicle except for what's under the hood (besides a small Hemi badge on the liftgate)?

Tony
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  #89  
Old 05-09-2013, 03:26 AM
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Originally Posted by GCLimited View Post
I was never taught that in shop class. Using higher octane fuel won't hurt you motor, but using a lower octane fuel than what is recommended for your engine could cause "pinging" and loss of power.

Octane rating only relates to how much a fuel can be compressed before igniting. The higher the number, the less likely it is to ignite under pressure.
I'm not saying it will hurt it the same way pre-detonation will. I'm saying that essentially if the fuel has 1 second to burn and regular burns completely at 1 second, premium rakes say 1.1 seconds because the flame front is slower, so there is 1/10 of a second of required burn that isn't done, that fuel instead ends up as carbon deposits in your intake, exhaust and your combustion chamber, slowly clogging it up.
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  #90  
Old 05-09-2013, 03:27 AM
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Originally Posted by Tony407 View Post
In terms of regretting the V6 vs. the V8, are there any other differences in the models? In other words, if I bought a '14 3.6 Summit vs. a 5.7 Summit, would they be the identical vehicle except for what's under the hood (besides a small Hemi badge on the liftgate)?

Tony
The v6 cannot be equipped with the rear elsd that comes with quadra drive 2. Otherwise yes. There is no hemi badge either
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Old 05-09-2013, 03:27 AM
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Quote:
Originally Posted by Tony407 View Post
In terms of regretting the V6 vs. the V8, are there any other differences in the models? In other words, if I bought a '14 3.6 Summit vs. a 5.7 Summit, would they be the identical vehicle except for what's under the hood (besides a small Hemi badge on the liftgate)?

Tony
Tony the only other thing I can think of is that with the V8 you will get a rear limited slip differential with the V8 hemi and not with he pentastar V6. Chryslers thing. You cannot get the limited slip differential with the V6.
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Old 05-09-2013, 07:49 AM
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Re: 2014 V6 owners - how do you like it?

After driving mine a bit more.. i really love the V6.. but regret not being able to set a default driving mode. If i remember to turn off eco and turn on sport then its great.. if i forget... its hell...

BTW.. confused on the limited diff thing.. If v6's have no limited diff, then wouldn't only drive 1 rear or front tire? making them basically a 1x1?
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Old 05-09-2013, 08:05 AM
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Re: 2014 V6 owners - how do you like it?

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Originally Posted by Icetech View Post
After driving mine a bit more.. i really love the V6.. but regret not being able to set a default driving mode. If i remember to turn off eco and turn on sport then its great.. if i forget... its hell...

BTW.. confused on the limited diff thing.. If v6's have no limited diff, then wouldn't only drive 1 rear or front tire? making them basically a 1x1?
Essentially yes, that's how 4x4's have been since the beginning of time if there is no locker or limited slip installed. The wk2 uses brake lock differentials though which is a fancy way of saying it uses the brakes on the wheel that are spinning to add resistance to transfer power to the other tire on that axle. Think of a open differential as power following the path of least resistance. This is effective but not as good as a true limited slip or a locker because power is lost in due to the brakes being used and if it is used a lot it can wear out the brakes sooner.
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Old 05-09-2013, 08:17 AM
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Re: 2014 V6 owners - how do you like it?

Quadra-Drive II differs from Quadra-Trac I or II in that it has an electronic limited-slip rear differential that can shift power left or right up to 100 percent depending on available traction. Better for off-road conditions.

Grand Cherokees with the Quadra-Trac I or II have conventional (open) differentials that will send power to the wheel with the least traction.

The rear electronic limited-slip differential should not be confused with a "Rear Locker" (manual or automatic) which locks power 50/50 to both wheels of the same axle.
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  #95  
Old 05-09-2013, 08:27 AM
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Re: 2014 V6 owners - how do you like it?

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Originally Posted by Icetech View Post
After driving mine a bit more.. i really love the V6.. but regret not being able to set a default driving mode. If i remember to turn off eco and turn on sport then its great.. if i forget... its hell...

BTW.. confused on the limited diff thing.. If v6's have no limited diff, then wouldn't only drive 1 rear or front tire? making them basically a 1x1?
Technically that would be a 4x1. 4 wheels with one being driven (like a 4x2)
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Old 05-09-2013, 11:05 AM
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Re: 2014 V6 owners - how do you like it?

Ah.. thanks for the lesson... I havn't done anything 4x4 in about 20 years and we all used dana 60's.. never even considered a 4x4 without a limited slip/locker setup.. as long as i don't get stuck in 4" of snow then im ok with it
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