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Old 01-06-2013, 02:26 PM   #1
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Economy mode??

2011 390RB with 340 Cummins and Allison 2500.

My control panel has a mode button, but nothing seems to happen when I press it. I've read about the red LED coming on, and maybe a display in the little window, but haven't seen either.

Is it possible to have a control with a mode button on it, but the mode switching functionality was not enabled by FL? Or perhaps it needs to go to the FL shop??

As an ex 18-wheeler driver, I'm used to staying in a higher gear as much as possible. With out being in economy mode I can't get the thing to shift to 6th, until close to 70 MPH.

The other thing that almost makes my hair stand on end, is the RPM's that the "computer" allows the engine to rev to when decelerating. I was taught as a truck driver that the RPMS should NEVER exceed about 1700. I've seen this combo ( 340/2500 ) let the revs go up close to 3000!!!

Quite frankly it scares the "stuff" outta me, since that's a lot of HEAVY parts "flying around" inside the engine; almost to the point of pistons "swapping holes".

Can anyone enlighten me?

Boowho??
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Old 01-06-2013, 02:39 PM   #2
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Boowho,


I have found the same thing with my "mode" light. I can never get it to come on. I have not noticed any issues in the 15,000 miles I put on last year. I still get 11.4 mpg. I find I have no issues getting to 6th gear, which is basically an overdrive gear. 5th gear is also an overdrive gear. When I asked the Freightliner Service Center about the Econ light, they said something to the affect, that it had to be programmed in. I never pursued it further, as I didn't believe it be to any advantage. As for the RPM issue, when I engage the Engine Break, I get the RPM's you mentioned we I slow down. I was told at Freightliner Camp, that is what is suppose to happen and will not harm the engine.

Craig
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Old 01-06-2013, 02:43 PM   #3
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Boowho,

I have found the same thing with my "mode" light. I can never get it to come on. I have not noticed any issues in the 15,000 miles I put on last year. I still get 11.4 mpg. I find I have no issues getting to 6th gear, which is basically an overdrive gear. 5th gear is also an overdrive gear. When I asked the Freightliner Service Center about the Econ light, they said something to the affect, that it had to be programmed in. I never pursued it further, as I didn't believe it be to any advantage. As for the RPM issue, when I engage the Engine Break, I get the RPM's you mentioned we I slow down. I was told at Freightliner Camp, that is what is suppose to happen and will not harm the engine.

Craig
I just love auto spell check!!! Not!!! It is Engine Brake and not Engine Break!!!
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Old 01-06-2013, 03:34 PM   #4
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Use the mode button when going down on level roads, it just gets to 6th gear a bit quicker. Really don't notice any gas savings to speak of.
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Old 01-07-2013, 10:43 AM   #5
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Economy Mode

When I push Economy Mode I get a small circular red light to come on. I called Freightliner and was told it changes (lowers) the shift points by about 200 rpm. Taking a trip using Economy Mode made no noticable differnce in the MPG althjough on absolute straight and level roads I got into 6th at 65 MPH and stayed there at when I dropped to 60 MPH. Speaking with several dealers who have some knowledge that I respect I have gotten several opinions on how to use this feature. I now leave it alone and do not turn it on.

Also I'm starting to think the Hot Lines are not so Hot.

Good Luck
AREA51
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Old 01-07-2013, 11:41 AM   #6
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When I push Economy Mode I get a small circular red light to come on. I called Freightliner and was told it changes (lowers) the shift points by about 200 rpm. Taking a trip using Economy Mode made no noticable differnce in the MPG althjough on absolute straight and level roads I got into 6th at 65 MPH and stayed there at when I dropped to 60 MPH. Speaking with several dealers who have some knowledge that I respect I have gotten several opinions on how to use this feature. I now leave it alone and do not turn it on.

Also I'm starting to think the Hot Lines are not so Hot.

Good Luck
AREA51

Thanks... I'm going to check with FL just the same; I like to run in the highest gear possible, as much as I can. It's just a "thing" with me; when I was still driving a semi, I'd always let the rpms drop (on a hill, for example) to around 1200 before downshifting.

That's the way driving schools teach proper shifting. They also teach "progressive" shifting, where you shift sooner in the lower gears (don't let the RPMS climb) than you do in higher gears. Listen to a semi at a light sometime; a good driver will have shifted 4-5 times before he even gets across the intersection.

Boowho??
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Old 01-07-2013, 01:00 PM   #7
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mode button

I have a 2008 39QS with the 340 and 2500 tran. I pull a Jeep grand Cherokee. I have spoken to both cummins and Allison people. The mode button changes the shift points, sets them a little higher. Both companies say to use mode all the time. They say that for motor home applications we are not comming near to taxing the motor tran combination. I know when in Mode I get 1 MPG better millage.
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Old 01-07-2013, 02:58 PM   #8
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Originally Posted by silver View Post
I have a 2008 39QS with the 340 and 2500 tran. I pull a Jeep grand Cherokee. I have spoken to both cummins and Allison people. The mode button changes the shift points, sets them a little higher. Both companies say to use mode all the time. They say that for motor home applications we are not comming near to taxing the motor tran combination. I know when in Mode I get 1 MPG better millage.
I haven't read the manual regarding this yet, but how do you put it into Mode I?

James
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Old 01-09-2013, 09:53 AM   #9
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Economy Mode

speedmerchant

See attached page 7.3 fig 7.2 button #12 light #11. Just touch mode button.

Good Luck
AREA51
Attached Files
File Type: pdf fliner2008_XC_owners_manual.pdf (4.30 MB, 49 views)
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Old 01-09-2013, 10:57 AM   #10
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silver,
I may be remembering wrong (I did write it down but the slip of paper is not at hand right now) but when I talked to Fliner I was told Economy mode sets the shift points about 200rpm lower so you can get into 5th and 6th at a lower speed.
Good Luck
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