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Old 01-03-2021, 01:17 AM   #11 (permalink)
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early baseline speed is constant load & MAF flow are variables

Quote:
Originally Posted by JulianEdgar View Post
Sounds good! Got some test results that you can share with us?
yes
2 of the initial baseline screen caps
with VCDS you can dial in the values , upper and lower for each parameter id or PID selected up to 10 PIDS , better to use fewer when you can collect what you need from just a few
less noise on the graph

instead of graphing , VCDS would log the data as csv and you could store longer samples and fuss with them using whatever office type software you are using

this is with Generic OBD2 not with VW KWP using measuring value blocks , engine data would be in address word 01

since i was / are only looking for change in in load OR MAF flow at a constant speed 3 PIDS in generic data was enough

my way is right for me , julian 's way is right for him
and what ever way YOU choose
will be right for you as long as what you choose has one constant that is repeatable
the variable will show improvement or lack thereof






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Name:	2005 vw golf tdi  load test 45 mph gps cruise on 164641 mile a.jpg
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Name:	2005 vw golf tdi  load test 45 mph gps cruise on 164648 mile b.jpg
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Last edited by mwebb; 01-03-2021 at 01:26 AM.. Reason: logging as csv is another option
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Old 01-03-2021, 01:23 AM   #12 (permalink)
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Quote:
Originally Posted by mwebb View Post
yes
2 of the initial baseline screen caps
with VCDS you can dial in the values , upper and lower for each parameter id or PID selected up to 10 PIDS , better to use fewer when you can collect what you need from just a few
less noise on the graph

this is with Generic OBD2 not with VW KWP using measuring value blocks , engine data would be in address word 01

since i was / are only looking for change in in load OR MAF flow at a constant speed 3 PIDS in generic data was enough

my way is right for me , julian 's way is right for him
and what ever way YOU choose
will be right for you as long as what you choose has one constant that is repeatable
the variable will show improvement or lack thereof


Attachment 29914Attachment 29915
Yes I had VCDS on my Skoda Roomster, so I am familiar with it. But I was hoping for some comparisons of your different results with aero mods?
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Old 01-03-2021, 10:40 AM   #13 (permalink)
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Originally Posted by JulianEdgar View Post
What does this show when you do it windows up / windows down?
Good point. I did the testing using cruise control over my flat test road of roughly 2 miles (3K?) in my wheel cover test, before I saw the windows up/windows down idea. I may be able to test my testing method in the next few days. I will report back.
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The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 01-04-2021, 06:06 PM   #14 (permalink)
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ScanGuage aero testing checks out

I had a few minutes today and dry roads before the storm coming in tonight so I decided to test my testing method. At Julianís suggestion I did a total of 4 runs on my reasonably flat, straight 2 mile test road. 30 degrees F and winds calm (3 mph from the west according to the weather radio from the airport next to the road). I did an east and west run with the windows up and repeated the procedure with all the windows down and the cruise control set to 65 mph (63 on the GPS) for all runs. There was no other traffic on the road during the testing.

I averaged the windows-up runs and got 51.05 mpg.
I averaged the windows-down runs and got 48.05 mpg.

That is almost a 6% difference so I feel pretty good about the ScanGuage current mpg test model.
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Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Old 01-04-2021, 07:02 PM   #15 (permalink)
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Quote:
Originally Posted by COcyclist View Post
I had a few minutes today and dry roads before the storm coming in tonight so I decided to test my testing method. At Julianís suggestion I did a total of 4 runs on my reasonably flat, straight 2 mile test road. 30 degrees F and winds calm (3 mph from the west according to the weather radio from the airport next to the road). I did an east and west run with the windows up and repeated the procedure with all the windows down and the cruise control set to 65 mph (63 on the GPS) for all runs. There was no other traffic on the road during the testing.

I averaged the windows-up runs and got 51.05 mpg.
I averaged the windows-down runs and got 48.05 mpg.

That is almost a 6% difference so I feel pretty good about the ScanGuage current mpg test model.
Yes, that's a great result.

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