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GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 363
Location: Southeast Michigan
The tunes have changed the pedal response significantly. One of the areas we focused on was to minimize the "clunk" in the driveline due to torsional lash wind-up. In order to do this we added filtering to the pedal, which tends to make the response more smooth, but slightly slower.

We would like to get a better understanding of your driving preferences for pedal response (snappy vs. smooth) and the relative importance of driveline clunk...does it matter? Several customers have noted the increased "coasting" with the tune, however, this may be a hinderence for some drivers. This part of the tune can be revisited and it should not effect fuel economy.

This is a democracy so vote early and often! We look forward to hearing your suggestions.

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Ripster
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Joined: 19/07/2009 08:05:49
Messages: 15
Location: UP of Michigan
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Like it the way it is, the drive line not clunking is well worth the coasting, which still has the slowdown effect, just less.

2005 Silver Limited CRD
GDE Eco Tune
PML Differential Cover/Crankcase Mod
Tal & Hadas Grill Guard/TransGo Shift Kit
V-6 AirBox/Lunar Boost & EGT
Lund Cold Weather Grill Insert
Cat 2 Filter, Cummins Lift Pump
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widowmaker
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Joined: 23/10/2009 06:27:49
Messages: 9
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I just spent the day driving in the mountains. Although the jeep coasts more freely than before, it held it speed going down steep inclines. The ride now is far more refined and less like driving a go-cart. To quote the ripster, " I like it the way it is".

2005 CRD Limited - Inferno Red - 142,000 miles
-GDE EcoTune -
-Gasser Airbox -
-Cummins Intank Lift Pump-
-Fumoto Drain Valve-
-Samco Red Hoses-
Procharged360
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Joined: 07/10/2009 18:18:42
Messages: 2
Location: S.E. Michigan
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I like the way the pedal feels with your tune. Obviously you believed it needed attention and you corrected it. Keep it the way it is.
LOSTCRD

Joined: 18/07/2009 22:51:54
Messages: 26
Location: San Antonio, Texas
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When tipping out of the go pedal at slower speeds in lower gears (1 & 2)...it does take a little getting used to the forward surge feel. Once you are accustom to that characteristic, all seems good.

2006 Jeep Liberty CRD...OME Lift...ASFIR Aluminum Skids and Steps...

DarbyWalters @ L.O.S.T.
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flman
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Joined: 28/08/2009 19:59:32
Messages: 74
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GreenDieselEngineering wrote:
This is a democracy so vote early and often! We look forward to hearing your suggestions.



I voted and did great according to the news

It was a good slap in the face to the socialist regime.

Still Burnin Oil since 1992!
2010 John Deere 2305 3 cylinder Yanmar
GDE HOT!! Tuned 2006 CRD LTD Silver, Euro TC, GDE Tuned TCM, B&M Trans drain kit
GDE ECO Tuned 2006 CRD Sport Black, B&M Trans drain kit, Front and rear hooks, Full Skids
GDE ECO Tuned 2005 MB 2500 Sprinter Van
2010 MB 2500 Sprinter Van
widowmaker
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Joined: 23/10/2009 06:27:49
Messages: 9
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Is the tipping surge that Darby mentioned more pronounced in the HotTune vs. Ecotune?

2005 CRD Limited - Inferno Red - 142,000 miles
-GDE EcoTune -
-Gasser Airbox -
-Cummins Intank Lift Pump-
-Fumoto Drain Valve-
-Samco Red Hoses-
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 363
Location: Southeast Michigan
Good question. It appears to be more pronounced with the hot tune. The rate of decreasing the fuel when releasing the pedal is the same for both tunes, but the hot tune allows 15-20 % more fuel in high load driving. So with the hot tune the decrease to zero fueling takes slightly longer and there is a noticeable difference.

We have spent the last few days working on optimizing the fueling ramping rates based on throttle input. The results are very promising as we have still been able to keep the "clunk" down to a minimum and the vehicle does not feel like there is any surging or positive torque when tipping out of the pedal. This part of the tune is very subjective to feel and 10 differenct customers may have 10 different preferences. The goal is to find the proper balance where no one even notices it...if it is transparent then we did a good job.
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ac5501

Joined: 17/07/2009 12:56:11
Messages: 4
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I've got not issue with the way that my tune (ECO) performs. However I'm not opposed to any effort that would increase coasting.
95BadBoy

Joined: 19/07/2009 06:48:47
Messages: 9
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I am very happy with the ECO tune. Vote for keeping as is, tipout works fine for me.

05 KJ CRD Sport - Lt Khaki with GDE Tune
05 TJ RME - Silver with stuff
flman
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Joined: 28/08/2009 19:59:32
Messages: 74
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GreenDieselEngineering wrote:Good question. It appears to be more pronounced with the hot tune. The rate of decreasing the fuel when releasing the pedal is the same for both tunes, but the hot tune allows 15-20 % more fuel in high load driving. So with the hot tune the decrease to zero fueling takes slightly longer and there is a noticeable difference.

We have spent the last few days working on optimizing the fueling ramping rates based on throttle input. The results are very promising as we have still been able to keep the "clunk" down to a minimum and the vehicle does not feel like there is any surging or positive torque when tipping out of the pedal. This part of the tune is very subjective to feel and 10 differenct customers may have 10 different preferences. The goal is to find the proper balance where no one even notices it...if it is transparent then we did a good job.


As an owner of both tunes, I have to agree, the hot tune has more of a run away feeling when you take your foot off the accelerator, the Eco tune is perfect.

Still Burnin Oil since 1992!
2010 John Deere 2305 3 cylinder Yanmar
GDE HOT!! Tuned 2006 CRD LTD Silver, Euro TC, GDE Tuned TCM, B&M Trans drain kit
GDE ECO Tuned 2006 CRD Sport Black, B&M Trans drain kit, Front and rear hooks, Full Skids
GDE ECO Tuned 2005 MB 2500 Sprinter Van
2010 MB 2500 Sprinter Van
LOSTCRD

Joined: 18/07/2009 22:51:54
Messages: 26
Location: San Antonio, Texas
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I think having the SEGR might also magnify the characteristic...since it does not let the EGR open at all when in any gear.

2006 Jeep Liberty CRD...OME Lift...ASFIR Aluminum Skids and Steps...

DarbyWalters @ L.O.S.T.
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flman
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Joined: 28/08/2009 19:59:32
Messages: 74
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Darby mine runs away with out the SEGR. Did you ever try the SEGR bypass with the Hot Tune? I bought a SEGR and while it was be shipped I heard of the GDE, so I sold it, and never had the SEGR.

Still Burnin Oil since 1992!
2010 John Deere 2305 3 cylinder Yanmar
GDE HOT!! Tuned 2006 CRD LTD Silver, Euro TC, GDE Tuned TCM, B&M Trans drain kit
GDE ECO Tuned 2006 CRD Sport Black, B&M Trans drain kit, Front and rear hooks, Full Skids
GDE ECO Tuned 2005 MB 2500 Sprinter Van
2010 MB 2500 Sprinter Van
LOSTCRD

Joined: 18/07/2009 22:51:54
Messages: 26
Location: San Antonio, Texas
Offline
Mine has a bit of that runaway feel also...seems to happen when going about 40 mph +/- 5mph which is right in the bigger torque curve according to the chart under FAQ. It will actually "go" for near a second...just under. Just the other day I was making a left turn and gave it the go pedal...when I lifted I was still shooting across the road...more than just coasting IMO. Once it loads up on fuel and boost, it is like it needs to finish that last "gulp".

2006 Jeep Liberty CRD...OME Lift...ASFIR Aluminum Skids and Steps...

DarbyWalters @ L.O.S.T.
[WWW]
 
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