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  #13153  
Old 03-08-2015, 09:38 PM
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Re: 2014 Grand Cherokee information - Australia

Frontal area isn't going to hurt until you're doing a decent speed though.

Tyres, it's as much about the increased rotating mass and rolling resistance as diameter... especially with 8 cogs in the box to choose from. Back when there were around half that many gears, first would struggle off the line and the top cog might end up simply too tall to use. Diameter could really hurt in this context. Now I believe it's the other factors doing most damage to fuel economy around town. Carcass weight, tread pattern and width, construction, inflation...

Cheers,
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  #13154  
Old 03-10-2015, 10:16 AM
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Re: 2014 Grand Cherokee information - Australia

With the quadralift in ours in sport mode most of the time i drive, i hit the 11.5-12.5 for fuel economy around town. Lots of heavy right foot and the bigger muddies is obviously what killed it. Cruising out of town the other day only got it down to 9.9 after a round trip of over 500km with a tiny bit of town driving before it. Definately a bit of a difference from the high 7's with standard tyres on the long trips, plenty of foot flat overtaking involved though.
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  #13155  
Old 03-10-2015, 01:22 PM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by Barboots View Post
Frontal area isn't going to hurt until you're doing a decent speed though.

Tyres, it's as much about the increased rotating mass and rolling resistance as diameter... especially with 8 cogs in the box to choose from. Back when there were around half that many gears, first would struggle off the line and the top cog might end up simply too tall to use. Diameter could really hurt in this context. Now I believe it's the other factors doing most damage to fuel economy around town. Carcass weight, tread pattern and width, construction, inflation...

Cheers,
Steve
Diameter makes a difference if you don't adjust for the decrease in the measured distance travelled though!
Russell
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  #13156  
Old 03-10-2015, 09:33 PM
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Re: 2014 Grand Cherokee information - Australia

Extremely valid point Russell. You've got to adjust that EVIC figure several percent when you've oversized, and make sure hand calculations are factored too.

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  #13157  
Old 03-11-2015, 01:17 AM
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Re: 2014 Grand Cherokee information - Australia

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Originally Posted by Barboots View Post
Extremely valid point Russell. You've got to adjust that EVIC figure several percent when you've oversized, and make sure hand calculations are factored too.

Cheers,
Steve
According to your table at the start of the Offroad 18's thread, the adjustment for my 265/65/18 BFG's is 3.46%. By my GPS the odometer is now about 4.5% too low. Either way, that is a significant fuel consumption difference.
Thanks,
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  #13158  
Old 03-15-2015, 01:56 AM
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Re: 2014 Grand Cherokee information - Australia

Quick question all, I've been on leave for 3 months and disconnected the battery in my 2014WK2 GC. Tried to get the battery out, however was thwarted by the deep seated bolts, so disconnected the positive terminal and left it at that. Dealer told me no issue with disconnecting the battery for that length of time. I will be getting home in the next week an intend to reconnect the battery and kick the old girl in the guts. Any issues given the multitude of computers on board etc.. Next time intend to take the battery out and connect to a trickle charger.... however the question is, will I have a problem having disconnected the battery for 3 months. If it don't start will call the jeep assist to help start. Thanks. P.
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  #13159  
Old 03-15-2015, 04:25 AM
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Re: 2014 Grand Cherokee information - Australia

I had mine disconnected for a week. I can't even remember if I lost the radio channels. I think they might have been preserved, but my memory is hazy.
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  #13160  
Old 03-15-2015, 05:36 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Red PeeKay View Post
Quick question all, I've been on leave for 3 months and disconnected the battery in my 2014WK2 GC. Tried to get the battery out, however was thwarted by the deep seated bolts, so disconnected the positive terminal and left it at that. Dealer told me no issue with disconnecting the battery for that length of time. I will be getting home in the next week an intend to reconnect the battery and kick the old girl in the guts. Any issues given the multitude of computers on board etc.. Next time intend to take the battery out and connect to a trickle charger.... however the question is, will I have a problem having disconnected the battery for 3 months. If it don't start will call the jeep assist to help start. Thanks. P.

We were away for 7 weeks overseas, I decided against a battery disconnect as there are some fantastic smart battery chargers available these days, the one I purchased for the Jeep is a Projector 1600 Charge and Maintain Unit, it is wall mounted with extra long leads. I also use a similar unit for my motorcycle it will keep your battery topped up and maintained, just clamp the leads on to the battery points under the bonnet and turn it on and walk away ( but put something on the bonnet to remind you it's there).
It works a treat as not only does the charger maintain the battery it helps to stop the battery from deteriorating from lack of voltage.




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  #13161  
Old 03-15-2015, 05:52 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Gforce View Post
We were away for 7 weeks overseas, I decided against a battery disconnect as there are some fantastic smart battery chargers available these days, the one I purchased for the Jeep is a Projector 1600 Charge and Maintain Unit, it is wall mounted with extra long leads. I also use a similar unit for my motorcycle it will keep your battery topped up and maintained, just clamp the leads on to the battery points under the bonnet and turn it on and walk away ( but put something on the bonnet to remind you it's there).
It works a treat as not only does the charger maintain the battery it helps to stop the battery from deteriorating from lack of voltage.




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I think either is an option.

Battery disconnect, no problem, battery will be maintained close to full but things like shift patterns and radio channels might be lost, no big deal.
AGM batteries have very low self discharge, so if disconnected, will lose very little.

Smart charger, IF it is good one, will keep the battery in good nick and maintain memory settings. Just be a little careful, some are much better than others, and some are particularly bad if there is a blackout or other power problem like a tripped circuit breaker, even temporarily.

Either way is better than going away for a long stint and letting the battery go flat.


Cheers
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  #13162  
Old 03-15-2015, 06:24 PM
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Re: 2014 Grand Cherokee information - Australia

Thanks all for the advice. The trickle charger is not an option when leaving the battery in the car (no power source close to where I park the car), so in future will take the battery out and leave it on charge in the house. Will let you know how I get on starting and running the car when I'm back at the end of next week.


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  #13163  
Old 03-15-2015, 06:39 PM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Red PeeKay View Post
Thanks all for the advice. The trickle charger is not an option when leaving the battery in the car (no power source close to where I park the car), so in future will take the battery out and leave it on charge in the house. Will let you know how I get on starting and running the car when I'm back at the end of next week.


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I wouldn't worry about taking the battery out, too much hard work.
AGM batteries (as in the JGC) have very low self discharge, way lower than wet cells. If disconnected, (preferably just after a run to charge it) you could leave it for months without issue.

Cheers
David
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  #13164  
Old 03-15-2015, 10:33 PM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Futuresystem View Post
I wouldn't worry about taking the battery out, too much hard work.
AGM batteries (as in the JGC) have very low self discharge, way lower than wet cells. If disconnected, (preferably just after a run to charge it) you could leave it for months without issue.

Cheers
David
Thanks David, will see how I go upon my return and startup!! Pretty excited, have the LED kit with me and will fit that as well.
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