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Old 11-06-2009, 10:30 PM   #1 (permalink)
Elvis-knows
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K08 K08 fuel-operated heater / auxilliary heat generator

Here are a few photos of the K08 fuel-operated heater / auxiliary heat generator on my new van. They confirm what Greg Landuyt and I both suspected: it's an OEM version of the Espar Hydronic D5.
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K08 K08 fuel-operated heater / auxilliary heat generator-cimg2568-k08foh-r1.jpg   K08 K08 fuel-operated heater / auxilliary heat generator-cimg2570-k08-foh-r1.jpg   K08 K08 fuel-operated heater / auxilliary heat generator-cimg2574-end-showing-espar-label.jpg   K08 K08 fuel-operated heater / auxilliary heat generator-cimg2574-end-showing-espar-label-closeup.jpg  
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This is my van: A 2010 GMC Savana 3500 Extended cargo van, with LMM Duramax & 6L90 6-speed transmission. There aren't many just like it, and this one is mine.

Last edited by Elvis-knows; 11-06-2009 at 10:37 PM.
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Old 11-07-2009, 08:16 AM   #2 (permalink)
LanduytG
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That is a D5 "Z" heater. Its not quite like a regular D5 but close. These are the units I use in our No Idle system. I wish I could see the plug to make sure they used the 8 pin oval connector. If so I think we can make this work for pre heat as well. We've done several Sprinters and those work like the one here.


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Last edited by LanduytG; 11-07-2009 at 08:25 AM.
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Old 11-07-2009, 08:41 AM   #3 (permalink)
Elvis-knows
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Quote:
Originally Posted by LanduytG View Post
That is a D5 "Z" heater. Its not quite like a regular D5 but close. These are the units I use in our No Idle system. I wish I could see the plug to make sure they used the 8 pin oval connector. If so I think we can make this work for pre heat as well. We've done several Sprinters and those work like the one here.

Greg
What is different about the "Z" model compared to the regular D5?

Where on the heater is the electrical connector that you want to see? (maybe on the side facing the frame rail??)

Do you have information about your "No Idle system" on your website?
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This is my van: A 2010 GMC Savana 3500 Extended cargo van, with LMM Duramax & 6L90 6-speed transmission. There aren't many just like it, and this one is mine.

Last edited by Elvis-knows; 11-07-2009 at 08:44 AM.
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Old 11-08-2009, 08:06 AM   #4 (permalink)
LanduytG
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Just flow the line coming out of the heater to its end and there the connector is. The Z does not come with its own water pump and the heater is controlled with a couple of different wires.


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Old 11-08-2009, 09:20 AM   #5 (permalink)
Joey D
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How is the new van, any miles on it yet? I am very interested in the 6spd trans and the cruising rpms.
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Old 11-08-2009, 07:12 PM   #6 (permalink)
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Quote:
Originally Posted by Joey D View Post
How is the new van, any miles on it yet? I am very interested in the 6spd trans and the cruising rpms.
Cruising rpms are well below 2,000.

I'm not sure if the vans had any kind of tach before (definitely not an actual gauge, anyway), but starting in '09, the DIC has a tachometer (and a lot of other features, most of which was new in the update of the interior that the vans got in 2009MY). I will have to write down the rpms at specific cruising speeds.

The new-for-'09 rework of the interior brought more useful updates than I would have thought, even though almost everything is still in the same physical location. The cruise control is now mounted on the steering wheel, and where there was a big wide slot under the radio, there is now a whole bunch of little square panels where switches could be mounted.

I basically only have the mileage on the 700 mile trek back from Branierd, MN, which is how far I had to go to get it. I can tell you that according to the DIC, it gets 23mpg at about 63mph steady state on level pavement, and that drops to 21mpg at 70mph.

The 2010 LMM vans are going to be very rare, because GM cut off the ordering in the middle of Sept. One dealer supposedly searched on everything at code 3000 (accepted for production) and higher, and found only one other one, ordered by a dealer in Louisiana. One Chevy dealer in New Jersey has several 2010 LMM vans inbound, but they are all fleet orders unlikely that the buyer is unlikely to not take.

After the pre-2010 Duramaxes are gone, the nearly $12,000 price tag for the diesel option is going to basically kill almost all of the customer demand for these, especially in vans. It will become a tiny niche product at that price, and it will be interesting to see who gives up on diesel vans first, GM or Ford. My guess would be the former.

BTW, the increasingly strict 2004/2007/2010 diesel emissions regs were a parting gift from the Clinton administration.
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This is my van: A 2010 GMC Savana 3500 Extended cargo van, with LMM Duramax & 6L90 6-speed transmission. There aren't many just like it, and this one is mine.

Last edited by Elvis-knows; 11-08-2009 at 07:26 PM.
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Old 11-08-2009, 07:56 PM   #7 (permalink)
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this is the some of the info i was looking for a few weeks ago - good pics of the unit!!!

the fleet order into Jersey is probably going to a utility co. or a upfitter. as I know of many ambulance co's now using the chevy vans in diesel form as the ford's have too many problems with the motors and brakes. a local EMS service here is doing everything they can to keep the 7.3 vans they have in service. IIRC 25 of the 40 7.3's are well over 350k and 5 are on at least one rebuild when they got close to 500k
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Old 11-09-2009, 02:39 PM   #8 (permalink)
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Quote:
Originally Posted by Joey D View Post
How is the new van, any miles on it yet? I am very interested in the 6spd trans and the cruising rpms.
I checked it today, and at 60 mph, it's around 1,600 rpm.
It doesn't shift into 6th gear until about 50mph cruising on level ground, and then downshifts back to 5th somewhere around 40mph.

BTW, the 2010 diesel vans have a 3.54 axle ratio instead of 3.73.
So the total reduction ratio in top gear is (0.67 * 3.54) 2.3718,
compared to (0.75 * 3.73) 2.7975 with the 4L80-E 4-speed.

And the super-low first gear (lower even than the Allison) gives the 6L90 lot more torque at low speeds to get heavy loads going. The 6L90 is (4.03 * 3.54) 14.266 in first gear, compared to (2.48 * 3.73) 9.25 with the 4L80-E.


Hydra-Matic 4L80-E (MT1) gear ratios
First: 2.48
Second: 1.48
Third: 1.00
Fourth: 0.75
Reverse: 2.07

Hydra-Matic 6L90 (MYD) gear ratios
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: 3.06

Allison 1000 (MW7) gear ratios

First: 3.10
Second: 1.81
Third: 1.41
Fourth: 1.00
Fifth: 0.71
Sixth: 0.61
Reverse: 4.49


ref.: http://archives.media.gm.com/us/powe...10truck_us.htm
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This is my van: A 2010 GMC Savana 3500 Extended cargo van, with LMM Duramax & 6L90 6-speed transmission. There aren't many just like it, and this one is mine.

Last edited by Elvis-knows; 11-09-2009 at 02:52 PM.
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Old 11-09-2009, 04:01 PM   #9 (permalink)
LtEng5
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interesting that the 6L90 has no 1:1 gear. Seems like a big jump from 4 to 5 too. how does it feel when driving and shifting from 4 to 5. over all looks like a good spread on the gear ratios; thou. what did they rate HP and TQ at for the vans this year?
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Old 11-09-2009, 09:55 PM   #10 (permalink)
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The power rating of the van version of the LMM Duramax is unchanged, but the 6L90 has a diesel engine rating of 300hp/520lb-ft. (roughly what the defunct 4.5L diesel was supposed to produce), and a gas engine rating of 450hp/530lb-ft. (ref.: http://archives.media.gm.com/us/powe...6L90_MYD_n.xls).

The 2010 van LMM is still rated the same as before (250/460). It would have cost GM too much to re-certify a new variant of the LMM for the vans, but you might see a power increase next year (not that it will be worth the 2010-compliant LML's nearly $12,000 price tag )

The 6L90 4th-to-5th step isn't particularly large.

Here's more info on the three trannies stack up.
"Steps" = percentage difference between two gears (lower is better, within reason).
"Total gear range" is the ratio of the lowest gear to the highest gear (higher is better, within reason).

4L80-E / Steps
First: 2.48
Second: 1.48 / 40%
Third: 1.00 / 32%
Fourth: 0.75 / 25%
4L80-E, Total Gear range: 3.31:1


6L90 / Steps
First: 4.03
Second: 2.36 / 41%
Third: 1.53 / 35%
Fourth: 1.15 / 25%
Fifth: 0.85 / 26%
Sixth: 0.67 / 21%
6L90, Total Gear range: 6.01:1


Allison / Steps
First: 3.10
Second: 1.81 / 42%
Third: 1.41 / 22%
Fourth: 1.00 / 29%
Fifth: 0.71 / 29%
Sixth: 0.61 / 14%
Allison, Total Gear range: 5.08:1

The Allison has larger steps between the middle gears, and then a much smaller step from 5th to 6th.

The 6L90 is not as strong as the Allison, but its gear ratios provide more versatility. But they could have given it a lower reverse gear, though.
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This is my van: A 2010 GMC Savana 3500 Extended cargo van, with LMM Duramax & 6L90 6-speed transmission. There aren't many just like it, and this one is mine.

Last edited by Elvis-knows; 11-09-2009 at 10:15 PM.
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