Delta testing discrepancyies? - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 04-29-2012, 10:46 AM Thread Starter
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Delta testing discrepancyies?

I recently got some info off of Fords PTS website. They describe the delta test as a WOT(wide open throttle) test. All the data from this site seems to be a steady 60-65mph test?? Both test indicate that no more than 15degrees difference in eot and ect.
I would assume that the manufactures tech data would be the most accurate...
With that said, are all of these test that are posted on this site inaccurate? It seems that the delta readings would differ greatly from WOT to steady throttle

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post #2 of 17 Old 04-29-2012, 11:59 AM
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post #3 of 17 Old 04-29-2012, 12:08 PM
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I'm going to keep my assessment of the Delta to the steady 60-65mph test. Its a more consistant test than a simple WOT run, and if the truck isn't warm in the first place a WOT run isn't going to tell you anything. Depending on your area, WOT isn't going to keep the law off your back either (some could assume street racing or aggressive driving). The cruising test is much lower key, and can be done as part of any normal drive on the interstate. It would have kept me out of the shop, had I known then what I know now.
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post #4 of 17 Old 04-29-2012, 12:39 PM
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The Ford TSB says to make a "careful" hard acceleration (WOT) to 65 mph, achieve maximum boost, and measure the deltas. I would do it that way, but my deltas actually drop a degree or so during the actual acceleration portion.

Ford states that it is speed AND load based. You do have to have the engine at full operating temperature to do the test.

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post #5 of 17 Old 04-29-2012, 12:51 PM Thread Starter
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Quote:
Originally Posted by bismic View Post
The Ford TSB says to make a fairly hard acceleration to 65 mph and measure the deltas. I would do it that way, but my deltas actually drop a degree or so during the actual acceleration.

Ford states that it is speed AND load based.
I have done it both ways. Both full operating temp. My delta at a steady 65 was 10degrees, at full boost hard acceleration was 8degrees.
Just thought it was interesting that the info available here is different than manufactures

2004 6.0 cclb 4x4 lariat fx4
-3" level
-35 12.50 toyo open country m/t
-18" Mickey Thompson classic lock
-cat delete
No go fast stuff yet...
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post #6 of 17 Old 04-29-2012, 01:33 PM
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I would offer that because these trucks live at cruise load, the WFO test is more of an extreme test. Something else to consider is there will be a DEFINITE difference when you put on an SCT simply due to the extra power you make at WFO with an SCT, but your cruise delta probably won't change.

My 67 Mustang with a 380hp/302 pukes out the overflow if I stay in it longer than a quarter mile and the coolant temp goes way up also. But general cruising, it runs great on the street. So which is the proper measure of the cooling system?

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post #7 of 17 Old 04-29-2012, 01:36 PM
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Quote:
Originally Posted by roadapple View Post
I have done it both ways. Both full operating temp. My delta at a steady 65 was 10degrees, at full boost hard acceleration was 8degrees.
Just thought it was interesting that the info available here is different than manufactures
First off, we tend to offer advice based on real world experience and sometimes that information is very different than you will get from the Manufacturer. Ford recommends Gold G-05 coolant and recommended a 5 year 100k mile service interval. International spec'd Cat EC-1 rated ELC coolant. I think you'll find that most people on this site agree that ELC is a better coolant choice and pretty much nobody believes that G-05 is good for 5 years or 100k.

People come here for answers when the manufacturers and dealerships let them down to get the real scoop. Sometimes that is definitely different than you get from the manufacturer.

Hope that helps.
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post #8 of 17 Old 04-30-2012, 11:03 AM
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Read the actual TSB yourself and decide:

httphttp://www.phila.gov/fleet/Warra...9-08-03.pdf://


People love to quote the TSB but have never read the actual document.


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post #9 of 17 Old 04-30-2012, 11:31 AM Thread Starter
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Quote:
Originally Posted by HeavyAssault View Post
Read the actual TSB yourself and decide:

httphttp://www.phila.gov/fleet/Warra...9-08-03.pdf://


People love to quote the TSB but have never read the actual document.
"carefully drive vehicle at wide open throttle high load to achieve max boost"

Thats a far cry from steady 60-65mph! As stated above i have done it both ways and found delta to be smaller following the TSB exactly.

2004 6.0 cclb 4x4 lariat fx4
-3" level
-35 12.50 toyo open country m/t
-18" Mickey Thompson classic lock
-cat delete
No go fast stuff yet...
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post #10 of 17 Old 04-30-2012, 11:32 AM
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