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Old 03-26-2009, 02:00 AM   #21 (permalink)
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I can use my butt-o-meter on my daily commute if you know well a portion of road you can see how the comportment is different. On a couple of small down slopes my car was slowing down and now it's accelerating. Also on a bigger down slope when I leave the top at a given speed, I arrive at a bigger speed at the bottom with the rear skirts than without.

As Pale said, coast down testing is a possibility. You may use the calc on IWillTry.org (see "Measure the drag coefficient of your car") if you want to calc your Cd.

I have also the idea to test the recording of the signal from a gps receiver while doing coast down and measure an average slow down in m/s/s with & without the mod. Currently time is missing not the ideas...

Denis.

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Old 08-28-2009, 07:03 PM   #22 (permalink)
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Back from the dead! New ideas...

Ok, so project Kammback was killed by the girlfriend

Other ideas that I'm currently planning/working on:
1)Installed alternator disable switch
2)Build custom solar panel and stick it on my trunk (there is turbulence in that area anyways so it shouldn't hurt with aerodynamics. And since project kammback was killed, this is my replacement). In the mail waiting for arrival.
3)Deep cycle battery in the trunk

*Should i use only the deep cycle? or wire it in parallel to the main starting battery?

4)(maybe) Alternator delete
5)Power steering delete
6)Rear wheel skirts
7)Front grille block
8)Underbelly Tray
9)skinnier LRR tires






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Old 08-28-2009, 08:49 PM   #23 (permalink)
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Another Del Sol on here cool!!! I love the paint/pic of the Kamm back you posted. I'm going to do one for sure I just need to finish the final tuning on the engine.

The attachment for the Kamm back is the hardest part for me. Still haven't' came up with a good idea?
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Old 08-28-2009, 09:42 PM   #24 (permalink)
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Quote:
Originally Posted by pgfpro View Post
Another Del Sol on here cool!!! I love the paint/pic of the Kamm back you posted. I'm going to do one for sure I just need to finish the final tuning on the engine.

The attachment for the Kamm back is the hardest part for me. Still haven't' came up with a good idea?
My kammback idea is dead, it did not pass the girlfriend approval test.

The only idea i had to attach the kamm was to drill or double stick tape a low profile hinge on the roof, to allow the kamm to swing up and rest on the roof, that way i still have access to the trunk.
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Old 08-28-2009, 10:21 PM   #25 (permalink)
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Quote:
Originally Posted by jedi_sol View Post
3)Deep cycle battery in the trunk

*Should i use only the deep cycle? or wire it in parallel to the main starting battery?
Depends on whether your deep cycle alone, or deep cycle + starting battery will get you where you're going (range).

One advantage of being able to switch between two batteries is this:

A) you drive with the alternator OFF on one of the two batteries
B) let's say you're not going to make it to your destination, so
C) you switch over to the "reserve" (fully charged) battery, and switch the alternator back on
D) then you recharge the deep cycle battery from the grid when you get to your destination

That scenario avoids switching the alternator back on part way through a drive, and taking the massive MPG hit of both running the vehicle plus recharging the batteries at the same time.

I like the idea of the solar cells on your rear deck. You're right - no aero harm in placing them there.
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Old 08-29-2009, 01:20 AM   #26 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
One advantage of being able to switch between two batteries is this:
This is what I was thinking.

Assuming I am using 2 deep cycle batteries, are you talking about an ACTUAL switch I would need to wire up? Or would one drain all its power, then the other one takes over?

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