MDS modification? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 25 (permalink) Old 02-09-2008, 04:28 PM Thread Starter
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MDS modification?

I know that it is probably possible, using aftermarket computer thingamagigs that we can alter the shift pattern manually. Sounds like fun and if I had an extra $600 or whatever lying around, maybe I'd do that. Now, thinking about it, if I can change the shift pattern with an aftermarket computer thingamagig, what would be the odds of being able to adjust the MDS with it. Maybe set it for ACTUAL highway speeds (55-75) perhaps? What do you all think?

If THAT were possible, it might actually be worth the $600 in the long run.

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post #2 of 25 (permalink) Old 02-10-2008, 09:49 AM
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On my 06 ram the mds kicked in at 40mph or higher. What are you trying to acomplish? For sh1ts and giggles try putting it in the tow/haul mode and see what happens. If memorie serves me right it shuts off MDS and also shuts off o/d. Dave...
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post #3 of 25 (permalink) Old 02-10-2008, 12:14 PM Thread Starter
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I'm looking to get better MPG by raising the MDS speeds and keeping it on 4 cylinders even after it passes 60 (although there appears to be some question as to when exactly MDS is on and off). I've played with the Tow/Haul mode when I towed my car across country and MPG SUCKED! So, I know what its like without MDS and overdrive. =)

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post #4 of 25 (permalink) Old 02-10-2008, 01:35 PM
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Quote:
Originally Posted by Twincam Dave
On my 06 ram the mds kicked in at 40mph or higher. What are you trying to acomplish? For sh1ts and giggles try putting it in the tow/haul mode and see what happens. If memorie serves me right it shuts off MDS and also shuts off o/d. Dave...
MDS on the Hemi 5.7 installed in the XK is supposed to engage between 40 and 60 MPH. PolarBZ is correct in that we have no idea if/when it really engages.
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post #5 of 25 (permalink) Old 02-10-2008, 01:38 PM
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Quote:
Originally Posted by PolarBZ
I'm looking to get better MPG by raising the MDS speeds and keeping it on 4 cylinders even after it passes 60 (although there appears to be some question as to when exactly MDS is on and off). I've played with the Tow/Haul mode when I towed my car across country and MPG SUCKED! So, I know what its like without MDS and overdrive. =)
Personally I wish you could disable the MDS on the Hemi all together. What is the point in trying to haul this 2 1/2 ton machine with a 4 banger?

Guess it really does not matter much since I rarely drive in the 40 - 60 zone! When I am in the city I hardly get to 40mph... when I am on my commute to work I travel at 75 most of the way. MDS may be able to kick in for about 10% of my commute.

Just my 2cents!
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post #6 of 25 (permalink) Old 02-10-2008, 07:07 PM
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Quote:
Originally Posted by HemiCommander
MDS on the Hemi 5.7 installed in the XK is supposed to engage between 40 and 60 MPH. PolarBZ is correct in that we have no idea if/when it really engages.
If you had an after market exhaust you'd hear it kick in, sounds like a Honda civic on steroids(kinda throaty). Had the Dodge cruising on I-75 @80 and it kicked in. Dave...
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post #7 of 25 (permalink) Old 02-10-2008, 07:37 PM
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WOuld have been nice if they linked an idiot light to its operation.
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post #8 of 25 (permalink) Old 02-11-2008, 01:25 PM
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With my muffler change and removing the resonator I can now tell when the MDS engages. It does sound a bit weird. And Yes a light would be nice to tell when its on.
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post #9 of 25 (permalink) Old 02-11-2008, 06:17 PM
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On my 08, I've had the MDS running at 78 mph. Has to be pretty flat and level though... I think the kick in is between 40 and 60, I don't think that it automatically disables when you get above a certain speed. My EVICS unit displays "Fuel Saver Mode" whenever it is on and I've never seen it active below 40 mph...but, anything below 40 mph I would be in "town" traffic which is never steady long enough for the MDS to trigger anyway.

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post #10 of 25 (permalink) Old 02-11-2008, 06:25 PM
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I also have an '08 XK and have noticed that the MDS does not kick in very often. I set my display to show my estimated mpgs and above it the "Fuel Saver Mode" notice will display. Usually I can trigger it if I let off the accelerator when approaching a stop. Otherwise, if I'm on the highway doing 70 with the cruise control - I don't see the notice. It would be nice if it would as right now I'm showing 13.1 mpg.

Last edited by Andre; 02-11-2008 at 06:31 PM.
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