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How does the GDE tune improve coasting ability  RSS feed
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ac5501

Joined: 17/07/2009 12:56:11
Messages: 4
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One of the things I've noticed since getting the GDE tune is that the jeep will coast a lot better. Before the tune, it felt like you were braking when you let off the go peddle. I always thought that was transmission/axle ratio. Apparently its not, as the GDE really improved this.

I was wondering what "settings/setting" would control this. I'm not looking for specific amounts as I understand you may want to keep that proprietary. My wife's Chevy Tracker does basically the same thing so I was wondering if any settings could possibly be modified there that might improve its coasting ability

Thanks AC
CRD Joe
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Joined: 18/07/2009 21:11:02
Messages: 49
Location: Seattle, Washington
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Thanks for that question AC. Im curious about that too.

'05 CRD
Suncoast, Transco, Inmotion, Provent, ORM Snorkle, HID's, 2.5" Cat back no muffler, V6 Airbox, Fumoto, Cat 2 filter
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 357
Location: Southeast Michigan
This can be attributed to how the raw accelerator pedal position is filtered. We made changes to this logic so that on a tip-out maneuver, the filtering lasts longer so that, even though you removed your foot from the pedal, it still injects a very small amount of fuel for a slightly longer duration of time. We also made changes to the driveability governors that allow for an improved coasting performance.
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CRD Joe
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Joined: 18/07/2009 21:11:02
Messages: 49
Location: Seattle, Washington
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GreenDieselEngineering wrote:This can be attributed to how the raw accelerator pedal position is filtered. We made changes to this logic so that on a tip-out maneuver, the filtering lasts longer so that, even though you removed your foot from the pedal, it still injects a very small amount of fuel for a slightly longer duration of time. We also made changes to the driveability governors that allow for an improved coasting performance.


Damn, you guys sound way to smart for your own good!

Im guessing that Ill be sending my CPU to you for a flash for my CRD equiped Suncoast TC.

'05 CRD
Suncoast, Transco, Inmotion, Provent, ORM Snorkle, HID's, 2.5" Cat back no muffler, V6 Airbox, Fumoto, Cat 2 filter
yakers

Joined: 13/08/2009 19:10:10
Messages: 7
Location: Pasadena CA
Any reports on how this works for off road driving? Some engine braking is a good idea off road and towing too (to bring in another subject). I assume this would improve MPG and maybe daily driving but wonder about the 'other uses' we have for our Jeeps.

“There are only two ways to live your life. One is as though nothing is a miracle. The
other is as though everything is a miracle.” - Albert Einstein
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GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 357
Location: Southeast Michigan
Yakers,

The improved coastdown goes help with MPG, but the diesel still has more inherent engine braking than a gas job due to the 17.5 to 1 compression ratio. Definitely understand your point about mountain driving, during testing we have cranked up the boost at zero throttle going downhill by closing the turbo vanes and the engine braking almost doubled...it would be a very nice feature for mountain driving with a trailer. We are investigating having minimal engine braking in 4th and 5th gears, but having higher engine braking in 3rd gear (when the O/D off button is engaged)...typical only used when trailer towing. If you want a specific setting in the tune we can always set it for your preference.
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yakers

Joined: 13/08/2009 19:10:10
Messages: 7
Location: Pasadena CA
That is a wonderful idea, to have more 'coast' in 4th & 5th but more braking in 3rd. Covers both needs.

“There are only two ways to live your life. One is as though nothing is a miracle. The
other is as though everything is a miracle.” - Albert Einstein
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