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Question about viscous heater shutoff temp  RSS feed
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CRD Joe
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Joined: 18/07/2009 21:11:02
Messages: 45
Location: Seattle, Washington
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"GDE now offers recalibration of the viscous heater shutoff temp. For those of you not familiar with the VH, it facilitate faster warmup, but runs pretty much all the time with the OEM ECU during the winter. Our experience is that it costs a full 3 MPG. The only option before to avoid this MPG penalty was to run with the VH relay removed. With a grill blanket, this was not too bad, but GDE now offers an even better alternative.

With the setting I have, the VH clutch engages at startup and disengages one "tick" below the "one quarter" mark on the instrument cluster temp gauge (recalibrated as per TSB).

This translates to about 5 minutes of drive time from cold startup during a typical NE winter day. Since fuel mileage is pretty horrible until the motor warms up, I think this is a good compromise. However, GDE can program your ECU to shut off your VH at pretty much whatever coolant temp you would like.

DOC"


This was posted on LOST! Im interested in getting a HOT tune for my truck as I have a Suncoast and Transco. Can you guys (GDE) please explain this option and what level youd suggest for me here in the Seattle area? It rarely gets colder than 40 degrees around here. When it is I alway plug my truck in.

Thank you

Tom

'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: 371
Location: Southeast Michigan
Here are the revised settings for the viscous heater:

Air temp shut off threshold stock = 54 F, new setting is 44 F
Coolant temp shut off threshold stock = 162 F, new setting is 131 F

If either condition is met the viscous heater will not be turn on. There is a 10 F hysteresis for turning the VH back on. With these settings you would only have the heater on for maybe 2 months out of the year and then only for the first 2-3 minutes after a cold start. After the engine is warm it would take several hours to cool down enough in order to meet the on conditions again. These settings have been released with the tune since mid October.

The largest contributer was reducing the coolant temp by 30 F, this prevents the VH from running during the winter months during light load city driving. The engine can run between 140-165 F in the cold winter months. We did not notice much difference in cabin heat, still comfortable inside.
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CRD Joe
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Joined: 18/07/2009 21:11:02
Messages: 45
Location: Seattle, Washington
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Thank you. Do I need to request that setting when I order my ultimate flash?

'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: 371
Location: Southeast Michigan
No need to request it. The changes to the viscous heater are already built into the tune.
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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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I am glad you folks are making all the adjustments, but we need to figure out a way to update
all the tunes out there, like mine, so I don't have to make a trip done there every year, but
that would not be so bad I guess.

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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GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 371
Location: Southeast Michigan
We understand a programmer would make it much easier for everyone that wanted a tune or wanted an update. The investment for a box is not insignificant by any means. We will be investigating the opportunity and costs associated with this in the New Year. Thanks for the feedback.
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