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Old 03-26-2016, 08:52 AM
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Ecodiesel Surging when passing

I have a 2014 WK2 Ecodiesel with GDE Hot Tune. No other updates to transmission, etc... I noticed a few times only while passing up hill at 55+ my vehicle has a very slight surge to it while passing. This never happens when taking off from a stop and never driving down the road normally. It seems to surge only under a load(no trailer). Has anyone ever felt this? It shifts down and maintains 7th gear when I feel the vehicle doing this throughout the entire pass. Anyone else have this happen? Thanks.

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Old 03-26-2016, 09:51 AM
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Quote:
Originally Posted by chadg2 View Post
I have a 2014 WK2 Ecodiesel with GDE Hot Tune. No other updates to transmission, etc... I noticed a few times only while passing up hill at 55+ my vehicle has a very slight surge to it while passing. This never happens when taking off from a stop and never driving down the road normally. It seems to surge only under a load(no trailer). Has anyone ever felt this? It shifts down and maintains 7th gear when I feel the vehicle doing this throughout the entire pass. Anyone else have this happen? Thanks.
There is something built into the BCM called passing assistance. Like if you're in cruise control and put your left turn signal on like your merging, the Jeep will drop a gear go 7th and help you speed up to quicken the merge into the passing lane. It's normal.
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Old 03-26-2016, 11:50 AM
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Re: Ecodiesel Surging when passing

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Originally Posted by definn12 View Post
There is something built into the BCM called passing assistance.
Interesting. I wish it were an optional setting. The EcoDiesel typically has quite a bit of power it can deliver without downshifting. Dropping into 7th and punching it really does cause a significant surge. When I'm driving on the interstate with ACC and I decide to pull around I'd typically rather pass at a moderate pace rather than having it power up it and push me back into my seat. If I've been behind a slow-moving tractor-trailer then I have seen it drop all the way to 5th.

On stock this can be tamed by using the paddle shifters and locking the tranny in 8th. From what I understand, the GDE Hot Tune will cause the system to downshift regardless—even in manual mode (and in manual mode it won't automatically shift back into 8th).
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Old 03-26-2016, 11:53 AM
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Originally Posted by Roadkill View Post
Interesting. I wish it were an optional setting. The EcoDiesel typically has quite a bit of power it can deliver without downshifting. Dropping into 7th and punching it really does cause a significant surge. When I'm driving on the interstate with ACC and I decide to pull around I'd typically rather pass at a moderate pace rather than having it power up it and push me back into my seat. If I've been behind a slow-moving tractor-trailer then I have seen it drop all the way to 5th.

On stock this can be tamed by using the paddle shifters and locking the tranny in 8th. From what I understand, the GDE Hot Tune will cause the system to downshift regardless—even in manual mode (and in manual mode it won't automatically shift back into 8th).
I've just learned to be mindful of it. It's only when the vehicle is in cruise control. I usually just cut off the ACC and merge and reset it.
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