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Old 05-01-2016, 04:24 PM   #29
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Thanks for posting this info. That is just like the Mercedes adjustable fast idle option. I wonder what it costs compared to having the factory option installed. The factory option includes a switch to engage and can be adjusted by the cruise control lever.

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Old 05-01-2016, 10:40 PM   #30
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... I just didn't understand from their website where to buy it and how to connect...
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Old 05-02-2016, 06:04 AM   #31
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Click on the 'Find a Dealer' tab and see if anyone in your area sells their stuff.
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Old 05-02-2016, 07:52 AM   #32
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Idling

High idle has to do with oil pressure.

Increasing the size of the hydrodynamic oil wedge at the main bearings.

It won't reduce DPF coking.

Modern diesels are better at controlling oil and water temps at idle, but no manufacturer recommends prolonged idling.

A Diesel engine, with or without emissions gear, needs to be run regularly at 60% load or greater to reduce combustion byproducts which reduce performance.
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Old 05-02-2016, 03:28 PM   #33
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A DPF is going to plug no matter what.

Those things were a bad idea and they are dangerous.

Before DPF's diesel trucks catching fire after accidents was kind of infrequent, now, not so much.

Like DEF, a huge PITA for little gain.


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Old 05-02-2016, 03:56 PM   #34
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If you have a real oil pressure gauge, not the factory type, you will see why prolonged idling is harmful. It is not uncommon for oil pressure to drop below 10 lbs at idle. That pressure will not fully support the main bearings.
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Old 05-03-2016, 05:43 AM   #35
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"High idle" brings oil pressure to approximately the point one sees on the highway after warm up.

However, it's pretty much too high an rpm at which to put an engine into gear.

Depending on spec, high idle may also raise alternator rpm enough to generate greater amperage. But this is more a commercial or police/EMT thing in years past.

I'd rather have it than not (even though my engine is pre emissions spec), but one uses prolonged idle at a cost.

In assessing a used vehicle, the average mph derived from engine hours versus total miles is an accurate indicator of health. I wouldn't ever buy a used diesel pickup where average mph was below 27, for example.

"High idle" is a useful option, but use should be sparing. It puts an engine into "severe service" category pretty quickly.

Diesel engines have very high compression ratios. Tremendous cylinder heat in normal operation. That's the norm.
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Old 05-03-2016, 08:25 AM   #36
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Great info.
And what is a good average total mph on the dashboard that you will buy the used diesel vehicle?
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Old 05-05-2016, 06:15 AM   #37
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An average above 27. I bought one where the average was 47. I don't think the original owner stopped except for diesel and cigarettes. A west Texas company truck pulling a light service trailer.

Took it to a Dodge dealer for a checkover where I had connections. Two men there wanted to buy it if I didn't. Has worked out well.
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Old 05-05-2016, 10:04 AM   #38
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An average above 27. I bought one where the average was 47. I don't think the original owner stopped except for diesel and cigarettes. A west Texas company truck pulling a light service trailer.

Took it to a Dodge dealer for a checkover where I had connections. Two men there wanted to buy it if I didn't. Has worked out well.

I'm missing something. How are determining the average MPH?


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Old 05-05-2016, 10:13 AM   #39
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The computer in modern vehicles will track and record average speed.

A better code reader will display this information.


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Old 05-05-2016, 01:14 PM   #40
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Any Benz today have it on the steering wheel buttons: in 'trip details' mode - fuel per gallon and mph from a morning start, and from the last reset.
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Old 05-05-2016, 05:10 PM   #41
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Any Benz today have it on the steering wheel buttons: in 'trip details' mode - fuel per gallon and mph from a morning start, and from the last reset.
Yes I understand those displayed trip details from last reset -- not useful in most cases as it gets reset. I reset mine for the trip to Alaska and now do it for each 10,000 mile servicing.

If the ECU stores average MPH or operating hours; then you would have to get it from stored memory on a special code reader.
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Old 05-05-2016, 10:02 PM   #42
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Yes I understand those displayed trip details from last reset -- not useful in most cases as it gets reset. I reset mine for the trip to Alaska and now do it for each 10,000 mile servicing.

If the ECU stores average MPH or operating hours; then you would have to get it from stored memory on a special code reader.

And that is exactly what the computer does.




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