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  #145  
Old 03-24-2015, 09:36 AM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

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Originally Posted by Stbentoak View Post
Gas won't be 2.50 a gal forever.. we are only one world crisis away from 4.00 gas again and then 30 MPG will shine....
That's true. However I rather doubt anyone who buys a HEMI in anything, is counting on cheap gas to be able to drive it. That is something you have to figure into the purchase...... Before you make it. If you have to question being able to afford the fuel, then buy something more economical.

People who buy HEMI's, then complain about the cost of the gas they put in it, are much like these people who buy 3,500 sq. ft. homes, then complain about the $700.00 a month electric bills in the Summer....... Or else they sweat in them.

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  #146  
Old 03-24-2015, 10:30 AM
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Quote:
Originally Posted by billt View Post

That's true. However I rather doubt anyone who buys a HEMI in anything, is counting on cheap gas to be able to drive it. That is something you have to figure into the purchase...... Before you make it. If you have to question being able to afford the fuel, then buy something more economical.

People who buy HEMI's, then complain about the cost of the gas they put in it, are much like these people who buy 3,500 sq. ft. homes, then complain about the $700.00 a month electric bills in the Summer....... Or else they sweat in them.
LoL it cost to be the boss.
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  #147  
Old 03-24-2015, 05:50 PM
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Talking Re: 2015 Grand Cherokee - V-8 Or V-6 ??

What ever decision you would have made would have been the right one. Congrats!
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  #148  
Old 03-24-2015, 09:31 PM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

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Originally Posted by 2014RedHemiGC View Post
Just curious where this info is supported. I can't seem to find anything about this, especially for late model GC's. MDS works great in mine.
Mine to. I can't even tell when its operating. Maybe it isn't?
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  #149  
Old 03-24-2015, 09:43 PM
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MDS is a very slight rumble not an issue at all to me. At low speeds it sometimes had some early engagement and lugging but the latest trans flash for the 5.7 fixed that even though it didnt state it in the tsb fix list. So it didnt fix the eco button but helped low speed lugging. Recommend the latest trans flash
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  #150  
Old 03-25-2015, 06:45 AM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

Someone clue me in, I don't do abbreviations very well. What is "MDS"???
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  #151  
Old 03-25-2015, 06:50 AM
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Quote:
Originally Posted by billt View Post
Someone clue me in, I don't do abbreviations very well. What is "MDS"???
Multi Displacement System it shutsdown fuel to 4 of the cylinders in the v8 under lite load to improve mileage
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  #152  
Old 03-25-2015, 07:02 AM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

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Originally Posted by Snipe315 View Post
WOW!

I'd love a tune for our HEMIs that improved performance to match those kind of numbers.
Wonder what rear axle was tested.

Gc has 3.09 with hemi
ram has 3.21 or 3.92 with hemi
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  #153  
Old 03-25-2015, 08:11 AM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

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Originally Posted by silvermax04 View Post
Multi Displacement System it shutsdown fuel to 4 of the cylinders in the v8 under lite load to improve mileage
Do all 2015 Jeep Grand Cherokee's with HEMI's come with this?
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  #154  
Old 03-25-2015, 08:19 AM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

Quote:
Originally Posted by billt View Post
Do all 2015 Jeep Grand Cherokee's with HEMI's come with this?

Yes.
I think it engages when the car hits 50mph?



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  #155  
Old 03-25-2015, 08:39 AM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

So..... Am I right that all that happens is it cuts off fuel to whatever cylinders? It doesn't hang open a valve to reduce compression at the same time?
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  #156  
Old 03-25-2015, 08:39 AM
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Re: 2015 Grand Cherokee - V-8 Or V-6 ??

Here's a good overview of MDS on the latest generation Hemi V-8.

http://www.wk2jeeps.com/wk2_engines.htm#MDS

I barely notice it at highway speeds. Can kinda feel/hear it around town. It never holds me back though.


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