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Old 08-12-2010, 10:26 AM   #31 (permalink)
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here is my data file. it has all my raw data and charts.

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File Type: xls wheel skirt testing.xls (22.0 KB, 21 views)
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Old 08-12-2010, 01:19 PM   #32 (permalink)
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Good testing is hard to do even when the weather (wind) does cooperate!

One suggestion: higher speeds will make any difference from aero mods stand out more (if there is any difference).
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Old 08-12-2010, 01:29 PM   #33 (permalink)
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how can I test at a faster speed with out braking the speed limit of 55mph? The only place I can think of is on the freeway (70MPH) but to get no traffic I would have to run the test between 2am and 4 am.

other ideas?

PS did more BABA testing this morning still need to put the data into excel.
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Old 08-12-2010, 03:21 PM   #34 (permalink)
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More data

Update:
I did a second set of steady state testing today.

Notes on testing:
Tested in this order B, A, B2, A2
warmed up car by driving 14 miles before testing (I think this was not enough)

Testing conditions:
Winds 5-8 N, NE
Temp, 78-84
RH: over 90%
speed was 55MPH using cruse
road was about as flat as I have around here.

A= normal no skirt
B= with both wheel skirts on
1S= run 1 South
1N= run 1 North
each way was 1 miles of testing
measurements with scan gauge

Here is the data:





Comments:
Wind was far more consistent today. it had some change to it but not a lot and it did about the same thing during each set of runs. I tossed of runs where there was lots of wind or no wind and still had more samples than yesterday.

The test mile was almost level, it had a hump at the start and end (intersection high spots). This made for less acceleration by the cruse control.

I might make up a graph without set B. I ran this set first and I think that the car was not fully warmed up by the 14 mile drive I did to warm it up. By the end of set B things seem to have fully warmed up as the next sets are similar to each other.

Summery: the data shows a slight benefit with the wheel covers on (.4 MPG or about 1%), This is still within the error rate for the test (standard deviation of between .6MPG & 1.1 MPG).

The benefit is even better if I toss out set B and only use the B2 data (.62 or 1.5%) with the same SD.


Those of you who have done testing like this, what do you think? valid results or not?
Attached is the data file with both today's and yesterdays tests.
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File Type: xls wheel skirt testing.xls (34.5 KB, 19 views)
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Old 08-12-2010, 03:28 PM   #35 (permalink)
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That looks slick!! Get ready to roll into the World of Rubberneckers

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Originally Posted by Weather Spotter View Post
how can I test at a faster speed with out braking the speed limit of 55mph? The only place I can think of is on the freeway (70MPH) but to get no traffic I would have to run the test between 2am and 4 am.
That's pretty much what I did. Well, almost. I started at 4:30am and it turned out that was too late (too much traffic).
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Piwoslaw's Peugeot 307sw modding thread

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Old 08-12-2010, 03:31 PM   #36 (permalink)
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Quote:
Originally Posted by Piwoslaw View Post
That looks slick!! Get ready to roll into the World of Rubberneckers


That's pretty much what I did. Well, almost. I started at 4:30am and it turned out that was too late (too much traffic).
what were the results of your testing? I only found MetroMPG results when I was looking at doing this. If you have good data, lets get both of our tests linked on the 65+ mods page! I think a moderator has to do it though
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Old 08-12-2010, 03:54 PM   #37 (permalink)
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My results are in my mod thread, post #40 and post #43. I got an 8% improvement in fc @ 100 km/h (62 mph), but this was for rear skirts, Kammback, removed roof rails and folded passenger mirror. I didn't have time to test each individually I've been hoping to test again this summer, but so far each weekend has been otherwise occupied. I want the second test done at a different site (less traffic) to compare to the first, and to compare once I get a bellypan, which can't be A-B-A-B tested easily.
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e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

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Piwoslaw's Peugeot 307sw modding thread

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Old 08-12-2010, 04:23 PM   #38 (permalink)
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I will have to look at how you did your kamaback, I need to see if it is worth doing on my car.
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Old 08-12-2010, 04:54 PM   #39 (permalink)
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Here is my cost data for the wheel skirts:
materials:
braces $8.00 bought two used one, cost is for both
screws $0.50 used some I had, but bought some to refill stock, cost is for ones used
sheet steel 0 free, had it laying around
brackets 0 free, taken off junk stuff
hinges 0 free, taken off junk stuff
Primer $5.00 Used 95% of one can
paint $14.00 bought two 8 oz cans used 1.5
clear coat $5.00 used less than half of can
Total $32.50 (only what was used = $22)

Time:
design time 2
build first bracket 2
build first skirt 2
mount and tweak first skirt 1
paint first one 0.75 (not counting dry time)
build second brace 0.5
build second skirt 1
mount and tweak second skirt 0.5
paint second one 0.75 (not counting dry time)
Total 10.5 hours

Testing:
Time:
planning 0.5
first ABA test 3.5
coast down 1.5
second ABA 2.5
Total 8 hours

Costs for testing:
gas 7 gal
cost $19.00
miles 280


So in total I have about $50 invested in skirts and testing. I also have 18.5 hours invested in making and testing them.

Testing takes a lot longer then I had thought But good data is nice to have (and share)
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Old 08-21-2010, 09:06 PM   #40 (permalink)
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Update: after 700+ miles on the car I have had no issues! No rubbing or loose parts!

With all my mods I have seen a 2-3 MPG gain (very conservative number).

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