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post #1 of 33 (permalink) Old 07-30-2005, 06:42 PM Thread Starter
 
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Default Rear Spoiler Removal?

Has anyone succeeded in removing the 2nd Gen rear spoiler (type A) and if so, how? Only apparent fasteners are the two phillips screws holding on the 3rd brake light lens.
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post #2 of 33 (permalink) Old 07-30-2005, 06:55 PM
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whatever for? that thing was tweeked about a dozen times in development to get just the right aerodynamics for the car.

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post #3 of 33 (permalink) Old 07-30-2005, 09:45 PM Thread Starter
 
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Originally Posted by Sanny
whatever for? that thing was tweeked about a dozen times in development to get just the right aerodynamics for the car.
Are you sure it was only a dozen? Sanny, you're assuming quite a bit. I was asking for help in how to remove it; not to be judged BECAUSE I'm removing it. If you must know, I'm planning on modifying the 3rd brake light to flash a few times before going "solid" red with a kit from webelectric.com. I thought that was reason enough.... I've read in this forum of several Prius owners being rearended and was hoping not to have to join that thread.
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post #4 of 33 (permalink) Old 07-31-2005, 07:16 AM
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I certainly wasn't judging you for wanting to remove it. I couldn't care less if you take your spoiler off. Just pointing out that it is an integral part of the design, and wondering why you want to. Maybe you had some reason that would benefit the forum, as you described in your follow up post. From that post, it doesn't seem that you want to remove it permanently (as I misunderstood from your first post). Be well, spoiler or no spoiler.

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post #5 of 33 (permalink) Old 07-31-2005, 07:34 AM Thread Starter
 
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Originally Posted by Sanny
I certainly wasn't judging you for wanting to remove it. I couldn't care less if you take your spoiler off. Just pointing out that it is an integral part of the design, and wondering why you want to. Maybe you had some reason that would benefit the forum, as you described in your follow up post. From that post, it doesn't seem that you want to remove it permanently (as I misunderstood from your first post). Be well, spoiler or no spoiler.
I see you are not the only one to jump to conclusions. (I'm not paranoid; people really are out to get me. ) You're right. I should have said, "how to temporarily remove it". No harm; no foul. Have a good one!
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post #6 of 33 (permalink) Old 07-31-2005, 10:13 AM
 
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Default spoiler

Does it really have a function? I thought spoilers were only useful when you hit 100 mph or so. Just curious.
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post #7 of 33 (permalink) Old 07-31-2005, 05:35 PM
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Default Re: spoiler

Quote:
Originally Posted by JKnight
Does it really have a function? I thought spoilers were only useful when you hit 100 mph or so. Just curious.
Spoilers do decrease drag on the vehicle at any speed that has coherent airflow over them. (Speed varies per vehicle because of individual aerodynamics, so I don't know what speed that is on the Prius.) The effect is negligible, though. (Although, based on the design premise of the Prius, it's probably enough to at least offset the weight of the spoiler itself.)

The purpose of a true 'spoiler' though, is to apply downward pressure to hold the rear of the vehicle to the ground better. In Indy racecars, they are traveling at high enough speed, and have a sufficiently large spoiler to produce a significant downward pressure. This keeps the rear (drive) tires on the ground better, letting them transfer more power to the road. When you see a 'tweaked' Honda Civic with a monster spoiler, though, it doesn't do anything useful. In fact, since the Civic is front wheel drive, it REDUCES power-to-road capability, since it is actually pivoting the car's front end upward. While it would look goofy as all-get-out, putting a spoiler on the front end would be more useful. (Which the smarter tweakers do by replacing the front end bumper with a new one that does have some spoiler-like effect. But, they usually counteract that by putting a rear spoiler on as well, though.)

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post #8 of 33 (permalink) Old 07-31-2005, 08:46 PM
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Default Spoilers

At lower speeds, spoilers and other devices can reduce or almost eliminate eddy currents that increase drag. You don't have to be going over 100 mph to see a difference. The spoiler on the Prius probably makes the back of the car "cleaner", reducing drag at highway speeds.

If you do take it off, let us know how much of a difference it makes. I'll bet it is a couple of mpg, if you do a lot of highway driving.
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post #9 of 33 (permalink) Old 07-31-2005, 11:28 PM
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I can never remember the official Toyota title for PriusMan and ee_of_ee, two toyota engineers/spokesmen who used to post on the old Yahoo Club toyotaprius. Anyhow, the 1998-2000 Japanese Prius didn't have a spoiler, and it was added to the 2001 Prius and has been kept in the 2004 redesign. here's a quote from Priusman on the spoiler on the 2001 Prius:
http://autos.groups.yahoo.com/group/toy ... ssage/2106
Quote:
What's next, oh
yeah, the rear spoiler.
I can only relate you what I
was told by the Chief Engineer. July '99, I'm
standing behind one of the LHD 1S prototypes (6-8
generations of proto from production) with ee, the head
designer and the CE at the Long Lead Press event outside
San Diego. I questioned CE on the fact that I noticed
a rear spoiler add in the recent spec summary. I
didn't want the cost up and didn't think it fit the
image that we were attempting to portray for the car. I
did that purposely with Irwin Lui the designer
present cause the CE would be forced to explain his
rationale rather than just dismissing me with a "marketing
story". And the designers are always so protective of
their design.
Thats when he explained how it helped
to clean up the air flow around and behind the car
contributing to its .29 CD and delivering a few mpg on the
highway test. Because it help move us closer to our
performance targets we take it. Thats the deal as I
experienced it, take it for what its worth....I'll see if I
can dig up some data to support....Now when you see
cars without, they're likely first generation
(12/97-4/00). But I'm pretty sure that all second generation
cars in all markets have rear spoilers - from May '00
on....except for those of you who have chosen to remove
it.....I'ld be real careful about rusting around those holes
or moisture within the deck lid for those of you who
have chosen removal.



-- Michelle Vadeboncoeur, [email protected]
2001 Aqua Ice Opalescent
2004 Black BC
fuel stats: http://www.kluge.net/~felicity/prius.php
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post #10 of 33 (permalink) Old 08-01-2005, 12:05 AM
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Quote:
Originally Posted by BMcGraw
I see you are not the only one to jump to conclusions. (I'm not paranoid; people really are out to get me. ) You're right. I should have said, "how to temporarily remove it". No harm; no foul. Have a good one!
You are paranoid. Nobody's out to get you.

Unless you bark at our Sanny too loudly! In that case, then... Grrrr!


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