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6.0L Power Stroke Diesel 2003 - 2007 F250, F350 pickup and F350+ Cab Chassis, 2003 - 2005 Excursion and 2003 - 2009 van SPONSORED BY:

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  #16  
Old 02-02-2011, 10:43 PM
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This may be off base, but here are some calculations:

Table below is from the PC/ED manual (misfire monitor):
Entry Conditions:
Entry condition.................Minimum.........Maximum
Fuel desired......................None............35 mg/stroke
Engine Oil Temperature.......50 oC............110 oC
Engine Speed (Low Idle)......600 rpm.........750 rpm
Vehicle Speed....................0 MPH...........1 MPH
Intake Air Temperature........-15 oC...........100 oC
Exhaust Backpressure Gauge...None...........50 kPaG
Injection Control Pressure Duty Cycle....0....50%
PTO off............................None..............N one

This seems to be between 120 degrees oil temp and full oil temp. It is at the initial low idle, not considering any "high idle mod".

Use 35 mg diesel fuel desired per stroke.
Assumption - 1 stroke = 1 revolution
Assumption - diesel density is 0.9 gm/cm3

(35mg x 750 rpm x 60 min/hr) / (1000mg/g x 0.9g/cm3) = 1750 cm3 of diesel used per hour

This is 0.46 gallons of fuel / hr

Maybe some wrong assumptions - hopefully someone will let me know if they are!

As I said earlier, the latest flashes will elevate the idle periodically (I need to re-read the TSB's to recall when and how much)

Here is an example of the thread that I recall seeing for the 6.0L:
http://powerstrokenation.com/forums/...t=18557&page=2
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  #17  
Old 02-02-2011, 11:00 PM
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After the truck starts, the engine idles for about a minute or so then it automatically goes into a higher idle, is this high enough rpm for extended idle time?
I never looked at the tach to see just how much it's raised.
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Old 02-02-2011, 11:09 PM
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Originally Posted by Benchwrench View Post
After the truck starts, the engine idles for about a minute or so then it automatically goes into a higher idle, is this high enough rpm for extended idle time?
I never looked at the tach to see just how much it's raised.
I don't believe so. My recollection is that the typical strategy will raise it to 850...... but I need to check that out in the TSB.
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  #19  
Old 02-02-2011, 11:09 PM
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The high idle kick in after 2 minutes varies rpm wise depending on outside temp. Example my truck goes to about 1,040 rpm when its around 30 or colder, but if its around 40 deg. it will high idle around 850 rpm.
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Old 02-02-2011, 11:29 PM
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Originally Posted by ljutic ss View Post
The high idle kick in after 2 minutes varies rpm wise depending on outside temp. Example my truck goes to about 1,040 rpm when its around 30 or colder, but if its around 40 deg. it will high idle around 850 rpm.
Good info!

I believe the TSB I saw stated that the point that the elevated idle kicked in was actually dependant on either oil or coolant temp (not ambient temp) - IIRC it is oil temp.
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  #21  
Old 02-03-2011, 12:13 AM
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Quote:
Originally Posted by bismic View Post
Good info!

I believe the TSB I saw stated that the point that the elevated idle kicked in was actually dependant on either oil or coolant temp (not ambient temp) - IIRC it is oil temp.

I should have been more specific with the temps. I take my temp readings from a Edge insight, EOT/ECT when I turn the ignition on in the morning.
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  #22  
Old 02-03-2011, 12:33 AM
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Quote:
Originally Posted by bismic View Post
Good info!

I believe the TSB I saw stated that the point that the elevated idle kicked in was actually dependant on either oil or coolant temp (not ambient temp) - IIRC it is oil temp.


FYI, the OEM high idle kicks off at 150F-ish.
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  #23  
Old 02-03-2011, 01:32 AM
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Originally Posted by 2006powerstroke90 View Post
Well I usually let my truck warm up for about 20-30 minutes before I leave for work in the morning and before I leave work to go home.

Some people say I am crazy for leaving it out there running for that long wasting fuel....

I really don't think I am using that much?

How much would I burn per hour?

20-30 min is too long. That is wasteful. I feel that with "warm up" in mind. 10-15 min is the max. After that is is unneeded. I let mine warm up for atou 10 min and I use a block heater for 3 hours in the morning.
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  #24  
Old 02-03-2011, 10:16 AM
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I use the block heater(3.5 hrs on a timer) and let it idle for around 10-15min in the morning. This morning it was -5 degrees F out. Block heater got it to about 80 degrees. High idle mod for 12 min got it to about 150 deg F.

FYI my Bully Dog Monitor has the option for monitoring fuel in gal/hr. Low engine idle is around .5-.65 gph and high idle is 1-1.25 gph. When the engine first fires and is "cold" it will use about twice that for the first minute or so, then level off to the values I posted. I don't know how accurate the reading is though.
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  #25  
Old 02-03-2011, 10:26 AM
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This is a job for the MythBusters.
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  #26  
Old 02-03-2011, 09:59 PM
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Quote:
Originally Posted by bismic View Post
This may be off base, but here are some calculations:

Table below is from the PC/ED manual (misfire monitor):
Entry Conditions:
Entry condition.................Minimum.........Maximum
Fuel desired......................None............35 mg/stroke
Engine Oil Temperature.......50 oC............110 oC
Engine Speed (Low Idle)......600 rpm.........750 rpm
Vehicle Speed....................0 MPH...........1 MPH
Intake Air Temperature........-15 oC...........100 oC
Exhaust Backpressure Gauge...None...........50 kPaG
Injection Control Pressure Duty Cycle....0....50%
PTO off............................None..............N one

This seems to be between 120 degrees oil temp and full oil temp. It is at the initial low idle, not considering any "high idle mod".

Use 35 mg diesel fuel desired per stroke.
Assumption - 1 stroke = 1 rpm
Assumption - diesel density is 0.9 gm/cm3

(35mg x 750 rpm x 60 min/hr) / (1000mg/g x 0.9g/cm3) = 1750 cm3 of diesel used per hour

This is 0.46 gallons of fuel / hr

Maybe some wrong assumptions - hopefully someone will let me know if they are!

As I said earlier, the latest flashes will elevate the idle periodically (I need to re-read the TSB's to recall when and how much)

Here is an example of the thread that I recall seeing for the 6.0L:
http://powerstrokenation.com/forums/...t=18557&page=2
The 6.0 is a 4 stroke, therefor it does not use fuel for every stroke ??????
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  #27  
Old 02-03-2011, 11:27 PM
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Quote:
Originally Posted by smokersteve View Post
20-30 min is too long. That is wasteful. I feel that with "warm up" in mind. 10-15 min is the max. After that is is unneeded. I let mine warm up for atou 10 min and I use a block heater for 3 hours in the morning.
Ditto that. You can idle it more, but then you might want to clean your EGR every week. Especially when it's actually cold. Let it idle for a few minutes until it goes to high idle. Then flip on your high idle mod.
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Old 02-04-2011, 12:19 AM
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Unless it is ridiculously cold, what's the point of idling for more than a minute or two and then driving easy until it's up to operating temp?
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Old 02-04-2011, 02:24 AM
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Quote:
Unless it is ridiculously cold, what's the point of idling for more than a minute or two and then driving easy until it's up to operating temp?
Ditto. Why not a dynamic warm up?
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Old 02-04-2011, 06:59 AM
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To much don't do it anymore
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Old 02-04-2011, 06:59 AM
 
 
 
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