10-09-2012, 08:27 AM
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#61 (permalink)
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Master EcoModder
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Europe is a completely different than US and Poland is in the group of those amazing countries, where any change in vehicle is "dangerous", but cars with no shocks, with bold tires and no lights are still on the streets...
Anyway, I'll try to do my best with mirrors to gave a decent view to the rear and to not get attention of cops or during annual inspection.
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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10-12-2012, 05:20 PM
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#62 (permalink)
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Master EcoModder
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Finally the wind stopped and I was able to make some coasd down testing of my kammy. To be honest numbers are to good to be true.
I've made 10 runs from 80km/h to 40km/h with gps speed indicator and stopwatch.
Kammy installed
1. 73 sec
2. 66 sec
3. 72 sec
4. 69,1 sec
5. 67 sec
average: 69,42 sec
Without kammy
1. 62 sec
2. 64 sec
3. 63 sec
4. 62.7 sec
5. 66 sec
average: 63,54
69,42/63,54=1,092540132
Over 9%???? That's impossible, but if those numbers are true that would be awesome!
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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The Following User Says Thank You to AndrzejM For This Useful Post:
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10-13-2012, 12:45 AM
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#63 (permalink)
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Batman Junior
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Impressive - seems very promising.
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10-13-2012, 12:50 AM
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#64 (permalink)
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Batman Junior
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Forgive me if you already covered this:
But does flow off the roof re-attach on the trailing edge of the hatchback's horizontal "deck lid" area? Did you ever tuft test that before adding the kammback?
That horizontal section looks too short, which would make re-attachment less likely. If that's the case, Kammy has the potential to make a significant improvement, as the coast down numbers suggest.
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10-13-2012, 02:29 AM
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#65 (permalink)
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aero guerrilla
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That looks awesome!
You should run the numbers through a spreadsheet to find your Cd change.
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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.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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10-13-2012, 05:43 AM
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#66 (permalink)
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Master EcoModder
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Quote:
Originally Posted by MetroMPG
Forgive me if you already covered this:
But does flow off the roof re-attach on the trailing edge of the hatchback's horizontal "deck lid" area? Did you ever tuft test that before adding the kammback?
That horizontal section looks too short, which would make re-attachment less likely. If that's the case, Kammy has the potential to make a significant improvement, as the coast down numbers suggest.
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Yes it is too short, and that's why Compact has the highest Cd, from the whole E36 series Cd=0,34 (the same as a station wagon) - aee attachment. I wanted to have a hatchback though, because it's the most practical car for me, and it weights less than other models.
Anyway, kammback seem to work as I hoped for so I need to build a final and permanent version now.
My friend who saw my YT video from tuft testing said that Berta looks funny, more like BMPrius than BMW 
Piwoslaw: I wanted to measure Cd but since my car is waydifferent from stock version according to reduced weight I need to weight her first. Maybe I'll go to local junkyard and ask guys there to weight Berta for me.
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Quote:
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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10-13-2012, 11:28 AM
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#67 (permalink)
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Batman Junior
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Well, I may be biased, but I think it looks really good:
Also: "BMPrius" is hilarious! |
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10-13-2012, 05:39 PM
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#68 (permalink)
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Master EcoModder
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Quote:
Originally Posted by MetroMPG
Well, I may be biased, but I think it looks really good
Also: "BMPrius" is hilarious!
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We'll see how Berta will look like after final kammy will be attached.
BMPrius - maybe stencil? 
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Quote:
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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10-14-2012, 05:47 PM
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#69 (permalink)
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Always Too Busy
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Just looked through your whole thread. Looks really good so far, nice work!
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10-15-2012, 05:39 AM
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#70 (permalink)
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Master EcoModder
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Thanks!
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Quote:
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Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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