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  #61  
Old 11-02-2013, 04:18 PM
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Re: tire swap (to LT and 265/65-18)

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Originally Posted by nautiboy View Post
Now the other piece to the puzzle I'm contemplating is the fact that for the 2 tires I've been looking at (Cooper Discoverer at/3 and Goodyear Wrangler All-terrain Adventure) the closest 18" tire size is the 275/65/R18 which is 32" in diameter compared to the stock 30.5".

Now others claim that the 32" fits without rubbing, but it does mean that the speedo will be off which doesn't bother me that much. The things I'm more concerned about are whether it will have any impact on the various electronic and safety systems, as well as whether there could be any warranty issues or other concerns due to the larger tires.


The larger diameter really only has a speedomenter error impact, that and the loss of mileage and power. All the systems work fine, i've run 31.5" for almost 3 years now on these wk2's. The 32" tire only works on stock offset rims. As you get more aggressive offset to the outside, you will have minor clearance issues unless you lift. Remember QL lowers at highway speeds, so what looks ok in the parking lot gets tighter at speed. The 265/65/18 is more forgiving fitment and still looks good at 31.5". Also speedo error on my 2013 with this height is almost 0. The stock speedo is optimistic by a couple of percent.

On my 2011 the same size was 2-3% off.
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  #62  
Old 11-02-2013, 04:18 PM
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Originally Posted by beechjetdriver View Post
I haven't taken delivery yet, but I think the level is supposed to be available in the EVIC display.
Still searching for it...
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  #63  
Old 11-02-2013, 04:57 PM
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Re: tire swap (to LT and 265/65-18)

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Originally Posted by webspoke View Post
The larger diameter really only has a speedomenter error impact, that and the loss of mileage and power. All the systems work fine, i've run 31.5" for almost 3 years now on these wk2's.
I looked up the revolutions per mile of the Michelin Latitude Tour (265/60-18) and the Goodyear AT Adventure (265/65-18). The difference is 663 rev/mi vs 682 rev/mi: 2.8%. So, at 75 mph the speedometer will read 73.

Would there really be a drop in fuel economy?
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  #64  
Old 11-02-2013, 05:01 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

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Originally Posted by mazster43 View Post
Way back in January when we thought we could order granite with the indigo was not an option. I was going with black and indigo at that time. The granite looks great with the blue. I think granite looks better than the mineral grey it replaced.

Been driving this evening in eco mode. Was averaging 25 in rural city setting. It gets up and goes in eco. Going to play with sport tomorrow to see how week she moves.
Do you have anymore pics other than the ones you posted earlier? Got the same color combo and need something to distract me while I'm waiting for mine to arrive
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  #65  
Old 11-02-2013, 05:54 PM
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Re: tire swap (to LT and 265/65-18)

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Originally Posted by mtnmerlin View Post
I looked up the revolutions per mile of the Michelin Latitude Tour (265/60-18) and the Goodyear AT Adventure (265/65-18). The difference is 663 rev/mi vs 682 rev/mi: 2.8%. So, at 75 mph the speedometer will read 73.

Would there really be a drop in fuel economy?
The bigger the tire the more you are effectively gearing down the engine... so yes.

Now how big of a hit, is the real question for ya.
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  #66  
Old 11-02-2013, 06:12 PM
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Originally Posted by jdixon04 View Post

Do you have anymore pics other than the ones you posted earlier? Got the same color combo and need something to distract me while I'm waiting for mine to arrive
I'm out and about. I'll post more pics tomorrow.
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  #67  
Old 11-02-2013, 06:23 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

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Originally Posted by mazster43 View Post
Had anyone that has taken Doherty of their NA diesels with DEF figured out to display the DEF level?
I don't think (but not positive) that it shows the level. There is a warning light on the dash when you get down to 500 miles, along with an EVIC warning. The first warning comes at 500 miles, then as the level gets lower and lower the warnings come more frequently.
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  #68  
Old 11-02-2013, 06:49 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

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Originally Posted by Shannon View Post
I don't think (but not positive) that it shows the level. There is a warning light on the dash when you get down to 500 miles, along with an EVIC warning. The first warning comes at 500 miles, then as the level gets lower and lower the warnings come more frequently.
Must be there somewhere. According to the User Guide:

Adding Diesel Exhaust Fluid
The DEF gauge (located in the EVIC) will display the level of DEF remaining in the tank.
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  #69  
Old 11-02-2013, 06:52 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

Quote:
Originally Posted by mtnmerlin View Post
Must be there somewhere. According to the User Guide:

Adding Diesel Exhaust Fluid
The DEF gauge (located in the EVIC) will display the level of DEF remaining in the tank.
With all the buttons and options, it should only take a month or two to find it
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  #70  
Old 11-02-2013, 07:02 PM
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Re: tire swap (to LT and 265/65-18)

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Originally Posted by Temerarius View Post
The bigger the tire the more you are effectively gearing down the engine... so yes.
"Gearing down" the engine? I think of it as gearing up. It would be like changing the diff' ratios from 3.45 to 3.35. It moves the engine speed down the power curve a little but a lower RPM might actually improve fuel mileage.
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  #71  
Old 11-02-2013, 07:04 PM
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Quote:
Originally Posted by Temerarius View Post
The bigger the tire the more you are effectively gearing down the engine... so yes.

Now how big of a hit, is the real question for ya.
Could improve mileage also. Your engine is turning the RPMs to go 73 and burning the fuel for that RPM but you are traveling 2 extra miles. It depends on the how close the stock gearing is to ideal. We'll know soon enough as I am sure some 32's will GI on a few CRDs. You will lose 2% acceleration by effectively decreasing the final drive ratio.
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  #72  
Old 11-02-2013, 08:02 PM
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Re: Welcome ALL 2014+ Jeep Grand Cherokee Ecodiesel owners!

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Originally Posted by ExcursionDiesel View Post
Could improve mileage also. Your engine is turning the RPMs to go 73 and burning the fuel for that RPM but you are traveling 2 extra miles. It depends on the how close the stock gearing is to ideal. We'll know soon enough as I am sure some 32's will GI on a few CRDs. You will lose 2% acceleration by effectively decreasing the final drive ratio.
...and the larger, heavier tire won't help your mileage...

...but who cares?
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