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Old 10-21-2010, 07:09 PM   #31 (permalink)
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Im running a 1.8 as well.
but I dont know if the trans is the original as Ive owned the car only for a few months.

Id really like to swap it with the 1.6L from a 323 if I could find one in good condition. with this trans and a smaller engine, Im betting I could see much better miles.

I did find something today when going over the car, there is grease all over one of my rims, so Im guessing I have a blown hub, even though its not making any sounds. that or my CV's are about ready to go out on that side.

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Old 10-21-2010, 08:54 PM   #32 (permalink)
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Old 10-21-2010, 10:14 PM   #33 (permalink)
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Quote:
Originally Posted by AeroModder View Post
One thing that's crossed my mind is kammbacking sedans without boattailing them increases the size of the rear area, thus increasing the size of the wake. Hatchbacks can get away with it because their rear ends are already large, and the kamm reduces it. Since airflow still reattaches on the trunk, the "suction cup" isn't as large, even if the air is perfectly clean.
This,

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Originally Posted by dkunitz View Post
Would it make sense to extend the trunk surface? I've seen sedan-shaped drag cars with enormous extensions that continue the line of the trunk. I think the vortex created under the extension might be more beneficial on sedans where you want to maintain easy access to the trunk.
And this.

It may not look like it, but the airflow is partially re-attaching at the trunk lid. Putting the kammback on there interrupted that airflow, and made a larger drag area. Instead of the airflow going down to trunk level (or close), it is breaking off where the kammback ends. Extending the trunk lip backwards will actually help pull the airflow down and break it off lower.
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Old 10-21-2010, 10:36 PM   #34 (permalink)
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Also, remember that while 7-12 degrees may be ideal, 20 degrees to a trunk lid is still functional. I'd suggest a flat extension of the trunk lid. It would be interesting to have an adjustable piece, that you could slide out 2-3 inches at a time to try and find the ideal length for your protege.
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Old 10-21-2010, 11:28 PM   #35 (permalink)
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Quote:
Originally Posted by SlideWRX View Post
Also, remember that while 7-12 degrees may be ideal, 20 degrees to a trunk lid is still functional. I'd suggest a flat extension of the trunk lid. It would be interesting to have an adjustable piece, that you could slide out 2-3 inches at a time to try and find the ideal length for your protege.
that is a good thought, and easily attempted
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Old 10-22-2010, 12:19 AM   #36 (permalink)
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The Bonneville flat spoilers also have vertical plates on the sides.

I took the 10" spoiler I mounted at 30* last week (had it on for a day, and it made things worse) and test-fit it without the 3" ductail spoiler in the way. It actually sits pretty flat, but there is a 1-2* upward angle from the 3/4" lip spoiler I've had on there for quite some time. My trunk does have a slight downward angle, though.
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Old 10-22-2010, 10:23 AM   #37 (permalink)
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Quote:
Originally Posted by AeroModder View Post
After removing my partial kamm, I couldn't tell if it was even doing much good.
I assume you are talking about your 1-2 foot Kamm. Did you ever do the 4 foot Kamm and see what it would do for you? I started out with a 1 foot extension so my trunk lid could open, and I saw no benefit (although it would have been hard to quantify), when I went to the 4 foot SedanKamm, I saw 6% over no extension.
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Old 10-22-2010, 12:50 PM   #38 (permalink)
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I haven't gotten to the 4 foot kamm, mostly because of financial constraints. I'd need to get a clear plastic sheet for rear visibility and find suitable supports. It would also eliminate the use of the trunk, which I'm trying to avoid.

With some rough eyeballing, it looks like a 15" flat spoiler on my car would make about a 15* angle from the roof, and the vertical plates on the sides could give the effect of extending the boattailing. The 15" extension is short enough for me to reach the lock on the trunk and open it

I'm going to do some more research on flat spoilers before I cut up more coroplast and test.


Here's some more shots of the Fusion:



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Old 10-22-2010, 02:31 PM   #39 (permalink)
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the one thing you should realize with those wingtails is they are used as both a stabilizer and for downforce to the rear end.
my guess is putting it at a slight angle down from the trunk lid would have more of a beneficial FE than straight out from the tail end ?
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Old 10-22-2010, 04:55 PM   #40 (permalink)
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d0sitmatr -

Quote:
Originally Posted by d0sitmatr View Post
the one thing you should realize with those wingtails is they are used as both a stabilizer and for downforce to the rear end.
my guess is putting it at a slight angle down from the trunk lid would have more of a beneficial FE than straight out from the tail end ?
In another thread we speculated that the spoiler also "intersects" the boattail :



You will see in the above that the "line" looks like it cuts through the vertical fin of the spoiler, but that is because the boattail/teardrop is intersecting the horizontal spoiler. Hope that makes sense.

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