On FWD, AWD, and switching... - Page 6 - 2014+ Jeep Cherokee Forums
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post #51 of 81 (permalink) Old 11-04-2015, 09:35 AM
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Yep, they'll look at you as if you came from outer space
I can only assume the mpg testing criteria do not include AWD being engaged on an automatic system. The very small difference in mileage (1 mpg city) is likely due to the small increase in vehicule weight, not AWD activating. The government required mpg numbers are therefore deceiving for a vehicule like the Cherokee, for a few reasons : safety features and an automatic all-wheel-drive system that are not factored into the numbers. Testing is not done below 40F, on an incline or when it rains...
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Last edited by Mark_; 11-04-2015 at 09:37 AM. Reason: yes, I should proof read...
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post #52 of 81 (permalink) Old 11-04-2015, 09:38 AM
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....
Now that depends a lot on how they calculate the AWD. That is if it is calculated in being engaged 100% of the time during the test or a % of estimated time.
....
Good point. If the EPA test is done in Auto Mode (most likely) with no grade level changes and no slippery surfaces or fast starts causing wheel spin and no rain and no temps below whatever, then the only penalty with AWD in the test would be the weight of the PTU, drive shaft, and RDM.
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post #53 of 81 (permalink) Old 11-04-2015, 09:40 AM
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Yep, they'll look at you as if you came from outer space
I can only assume the mpg testing criteria do not include AWD being engaged on an automatic system. The very small difference in mileage (1 mpg city) is likely due to the small increase in vehicule weight, not AWD activating. The government required mpg numbers are therefore deceiving for a vehicule like the Cherokee, for a few reasons : safety features and an automatic all-wheel-drive system that are not factored into the numbers. Testing is not done below 40F, on an incline or when it rains...
Guess we were thinking the same things
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post #54 of 81 (permalink) Old 11-04-2015, 09:43 AM
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Hahaha. Yes sir...

Zhe Wiz mentionned '05Train laying down rubber for us. We also have you to thank for the ScanGage testing as well (hope I got the spelling correct there). We'll eventually get to the bottom of all this... Also hoping the ScanGage with Cherokee tweaks makes it to market
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post #55 of 81 (permalink) Old 11-04-2015, 10:16 AM
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... Also hoping the ScanGage with Cherokee tweaks makes it to market
To me, the ScanGauge is bulky. The cord with the OBDII connector is about 5mm or 3/16" thick and just short of 6 feet long and then the gauge needs to be mounted. It's good for doing some tests, but then put it away. Would be much better if it consisted of an OBDII Bluetooth dongle and an app on a smartphone. But maybe there is a business model problem with releasing the software to non-dedicated hardware.

Before I got the ScanGauge, was considering temporarily putting some duct tape around the drive shaft leaving a tail of it loose so it would hit the undercarriage and see if I could hear it while driving.

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post #56 of 81 (permalink) Old 11-04-2015, 10:41 AM
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To me, the ScanGauge is bulky. The cord with the OBDII connector is about 5mm or 3/16" thick and just short of 6 feet long and then the gauge needs to be mounted. It's good for doing some tests, but then put it away. Would be much better if it consisted of an OBDII Bluetooth dongle and an app on a smartphone. But maybe there is a business model problem with releasing the software to non-dedicated hardware.
Yeah, ScanGauge is bulky...and UGLY. I have one in my Prius, but no way I'm defacing our beautiful Jeep interiors with that ugly thing. Wish they'd make a more attractive version.

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post #57 of 81 (permalink) Old 11-04-2015, 10:45 AM Thread Starter
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Good point. If the EPA test is done in Auto Mode (most likely) with no grade level changes and no slippery surfaces or fast starts causing wheel spin and no rain and no temps below whatever, then the only penalty with AWD in the test would be the weight of the PTU, drive shaft, and RDM.

Exactly. The EPA numbers don't reflect the AWD being engaged.

I imagine that the 40 degree point was made to idiot -proof the driveline. Most people will never take it out of Auto,.

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post #58 of 81 (permalink) Old 11-04-2015, 10:49 AM
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*ScanGauge*. Corrected in my brain

Ah, I see. I thought it was a BlueTooth device. Maybe in a future evolution... I have a little BT device already, and being able to use a smartphone app is really convenient... wink-wink nudge-nudge...

Duct tape hitting the undercarriage ? Hahaha.... reminds me of folded empty cigarette packs we clipped to our bikes' rear forks with a clothespin...lol.

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post #59 of 81 (permalink) Old 11-04-2015, 11:09 AM Thread Starter
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It is rather odd that there's no indicator for the AWD. There's a light for the stability control (and if the stability control is kicking in, a dash light is the last thing you should be looking at).
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post #60 of 81 (permalink) Old 11-04-2015, 11:15 AM
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Humm. Maybe the stability control light is mandatory somehow, or it is just an indsutry standard. Having an AWD light might be a little too revealing for FCA to handle, and our discussion here is an example.
My memory fails me a little, but I've seen a recent car commercial - I think from Lincoln - where you see a funky drivetrain animation on the main console screen, where driven wheels are clearly shown. Now that would be far better than an AWD light, but I'm asking too much for a vehicule in this price range. Maybe on the GC. We could get a light though...
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