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Old 03-28-2016, 07:08 AM   #15
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Ok thanks guys. So it's only for when it's in V4 mode. I thought it may be a setting for a different mode that would yield a little better mpg. My mother in law has chrysler minivan that has a normal and ECO setting. Thought it may be similar. Thanks again.

Chad
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Old 03-28-2016, 06:17 PM   #16
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I can't say what the truck eco mode is but on my 2015 Jeep Grand Cherokee diesel, when I push the eco button to on, the transmission shifts are sooner and at a lower rpm.


Ok when not towing but I turn it off when towing. Wireman
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Old 03-28-2016, 06:36 PM   #17
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On the 6.4 it just shows when you are driving economically. It doesn't change any shift points or enable MDS. It also doesn't necessarily mean MDS is engaged.
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Old 03-28-2016, 11:22 PM   #18
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On the 6.4 it just shows when you are driving economically. It doesn't change any shift points or enable MDS. It also doesn't necessarily mean MDS is engaged.
Not too sure about that. Mine is only on when the MDS kicks in. I know when it kicks in as I have a Mufflex on mine and I sure can hear it. MDS kicks in, light comes on, MDS kicks off, light goes out.
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Old 03-29-2016, 07:08 PM   #19
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Maybe, but at low speeds you can be in MDS and not have Eco light on. Eco Light is not tied to MDS.
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Old 03-29-2016, 08:32 PM   #20
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I looked this morning through my EVIC and radio settings and couldn't find it. I guess they didn't have it on the 14s.

Chad
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Old 03-29-2016, 09:08 PM   #21
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Controls -> Settings -> Display -> Fuel Saver Display in Cluster.
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Old 03-31-2016, 07:45 AM   #22
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We tow a 13k plus toy hauler and, for a gas engine, it does quite well. That said, it is a high revving engine and gearing is everything when towing. I re geared to the 4.56 and going from 3.73, standard gearing, is night and day. The tow rpms are now down into the high 2's and low to mid 3's. As for mileage, can't say much difference. Around 8 but it sure runs easier and now can tow easily at low speeds in the higher elevations. That's where the 3.73 suffered greatly as 1000 rpm = 10 mph so if towing as say 30 mph, was only running 3k rpm which isn't near to the power band. It will get it's work out this summer as planning a 3 to 4 month Can. AK trip and probably around 12,000 miles. Will have a lot more insight after returning. Final thought for re gearing, knowing what I know now, would be very temped to go with the 4.88 gears.
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Old 03-31-2016, 02:20 PM   #23
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Low gears = more power. Gearing a 4X4 is a killer. I have the 4.10 gears on mine. I know 4.88's would be like adding a turbo charger.

Did your computer system go nutz when you re-geared?
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Old 04-01-2016, 07:11 AM   #24
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No problems at all with the computer but still wonder if the program with 4.10 isn't a little different. The only thing I would change is the trans shift points when running empty. Could stand to shift a couple hundred rpms sooner but if I feather the throttle I can get them almost there. That said, even if I just drove normal it isn't a problem. Also, being in CO, think the overall gearing is better suited for overall performance and towing. Not the constant up or down shifting as before and that also includes when towing. Very happy I made the change
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Old 04-01-2016, 11:16 PM   #25
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And the Hemi is meant to rev. It's pretty happy at 5,000 rpm. The 6.4 was actually built as a truck engine. I think it'd be pretty cool if they tried a supercharger on one. I think this engine can handle a very dependable 500 hp and 500 plus torque.
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Old 04-02-2016, 07:39 AM   #26
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The Hellcat uses the Ram 6.4 block.
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Old 04-02-2016, 08:16 AM   #27
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The Hellcat uses the Ram 6.4 block.
Hellcat is actually a 6.2 litre block. The srt 392 use the 6.4 block. It's 475 hp.

Chad
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Old 04-02-2016, 10:00 AM   #28
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Hellcat is 6.2l, yes.

It gets those 6.2l by using the block of Ram 6.4 and it's bore diameter, but has 5.7l stroke.

SRT chose to use the Ram 6.4 block over SRT 6.4l block because it it designed to be more robust than its car counterpart.
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