Back window / rear of 4Runner is always dirty.

[broncosi]

front and rear

 

[broncosi]

rolled up on a sunny day

 

[broncosi]

its alot easier to see out, the camera has an auto flash when it senses low light, so this is with the flash on:

 

[ljp3]

its alot easier to see out, the camera has an auto flash when it senses low light, so this is with the flash on:

That looks reall nice!!!

The inside is not bad, I have 15% and it looks about the same.

 

[Fourty-four]

I agree with 20runner. ...In my previous Montero adding rear spoiler I gain ~2mph in top speed (was measured by GPS). So on SUV like 4Runner it's functional. Just my 2c.

Almost every street vehicle has a higher top speed without a rear spoiler. Car and Driver did a top speed comparison of several different vehicles with factory rear spoilers installed and then repeated the testing with the spoilers removed from the same cars. In every case, the cars went faster without the spoilers.

And anyone who thinks that the 4Runner's factory rear spoiler helpls keep the back end clean is kidding himself. :bash:

 

[AlexJet]

Almost every street vehicle has a higher top speed without a rear spoiler. Car and Driver did a top speed comparison of several different vehicles with factory rear spoilers installed and then repeated the testing with the spoilers removed from the same cars. In every case, the cars went faster without the spoilers.

And anyone who thinks that the 4Runner's factory rear spoiler helpls keep the back end clean is kidding himself. :bash:

I

 

[Fourty-four]

I

 

[Uneek]

even on the back its illegal??

Depends on your state. In CA, the rear windows can have any percentage, so 1% or even 0% is ok in CA.

Tint percentages in other states.

That 1% looks sweet. So dark that it gives off the mirror effect. I thought I read on this forum that someone had really dark tint and they had to roll the rear window down to see at night.

 

[racefan_67]

hey forty-four....everyone is entitled to their opinions..... AlexJet definitely knows his stuff when proving things with his knowledge and backround....no need to be nasty about it though....please share with us where the OEM spoiler school you obtained your Ph.d. is located....perhaps we can learn something new.....

 

[Fourty-four]

hey forty-four....please share with us where the OEM spoiler school you obtained your Ph.d. is located....perhaps we can learn something new.....

Did you know that I want to skool with AlexJet? We gradiated together from the skool of hard knocks. We're both Doctors now.

 

[broncosi]

Did you know that I want to skool with AlexJet? We gradiated together from the skool of hard knocks. We're both Doctors now.

haha nice, i got my crappy neurosurgeon degree from Sylvan Learning Center!

 

[AlexJet]

Fourty-four, for your information I've 9,5 years of University and more then 10 years experience in Aerospace Industry with Boeing, British Aerospace, Gulfstream Aerospace Corporation. I don't want to argue about my or someone else background, due to the fact that first, this is personal and we're not here to prove everybody

 

[teotwaki]

I'll take Alex Jet's explanation due to the presentation of facts that can be cross checked as opposed to opinion that defies validation. :soapbox:

 

[Fourty-four]

Whew! Thanks for taking the time to type up that long-winded, but unaerodynamic response.

In the mean time, I'll keep driving my 4Runner with its air-brake rear spoiler and pray to the Gods of the winds that it keeps the dirt off the back end.:arrow: :arrow:

 

[teotwaki]

google "base aerodynamic drag" and it gets hundreds of interesting results on university and government research projects. http://www.google.com/search?hl=en&q=base+aerodynamic+drag

This URL is sort of entertaining as they explore the fuel savings due to tail gating (drafting): http://gcep.stanford.edu/pdfs/ChEHeXOTnf3dHH5qjYRXMA/10_Browand_10_11_trans.pdf

I am guessing that when a second vehicle enters the low pressure area behind the first vehicle that they are actually reducing the Cd base of first vehicle. "But officer! I wasn't tailgating, I was improving his fuel economy!"

I also learned about Hoerner's two and three dimensional base drag models when considering optimization of the forebody coeficient of drag. It turns out that even large space vehicles have the same problem with truncated bodies (flat asses) that motor homes and minivans do.

I had originally dismissed the 4Runner's spoiler as "bling". After being motivated by AlexJet's post to learn more, I can see how introducing some drag at the top of the vehicle can pay off when reducing the drag at the back of the vehicle. I can even believe that Toyota engineers knew it too.

www.google.com: "looks more like an air brake" gets no supporting information from UHK (University of Hard Knocks).
http://www.ab.edu/alumni_and_friends/university_of_hard_knocks.html

My background? More in electronics than aerodynamics. Look at this site: http://mars.jpl.nasa.gov/MPF/rovercom/rovcom.html

I was a NASA engineer for 13 years and I worked with a lot of folks like AlexJet who can share knowledge and stimulate the learning process with well chosen words.

Whew! Thanks for taking the time to type up that long-winded, but unaerodynamic response.

In the mean time, I'll keep driving my 4Runner with its air-brake rear spoiler and pray to the Gods of the winds that it keeps the dirt off the back end.:arrow: :arrow:

 

[Fourty-four]

I am guessing that when a second vehicle enters the low pressure area behind the first vehicle that they are actually reducing the Cd base of first vehicle. "But officer! I wasn't tailgating, I was improving his fuel economy!"

Congrats for finally learning a simple concept that any 13-year-old NASCAR fan already knows.

Did ya ever wonder why it's so common to see two race cars running at high speeds with only inches between 'em???? If so, then you must know a bit about draftin', goober.

Jeez, even Tom Cruise demonstrated this simle concept on Nicole Kidman's thigh in Days of Thunder (1990).

Meanwhile, my OEM factory spoiler does nothing to help fuel economy nor keep the back end clean:bash:

But it sure looks purty, so I think I'll keep it on there.

 

[teotwaki]

AlexJet: I just wanted to say thank you for the polite and informative posts that avoided name calling and baseless accusations.

Have you seen any numbers for the Cd of the 4Runner? I tried some Googles but had trouble finding a published number.

Thanks!!

 

[momo.75]

Congrats for finally learning a simple concept that any 13-year-old NASCAR fan already knows.

Did ya ever wonder why it's so common to see two race cars running at high speeds with only inches between 'em???? If so, then you must know a bit about draftin', goober.

Jeez, even Tom Cruise demonstrated this simle concept on Nicole Kidman's thigh in Days of Thunder (1990).

Meanwhile, my OEM factory spoiler does nothing to help fuel economy nor keep the back end clean:bash:

You don't have to be rude to get your point across........Since you only have 29 posts I will let you know that this is a place where people try to help each other out. If you want to bash people, you might want to find another forum........it is not going to happen here.

 

[Mark86]

Congrats for finally learning a simple concept that any 13-year-old NASCAR fan already knows.

Did ya ever wonder why it's so common to see two race cars running at high speeds with only inches between 'em???? If so, then you must know a bit about draftin', goober.

Jeez, even Tom Cruise demonstrated this simle concept on Nicole Kidman's thigh in Days of Thunder (1990).

Meanwhile, my OEM factory spoiler does nothing to help fuel economy nor keep the back end clean:bash:

But it sure looks purty, so I think I'll keep it on there.

Please abide by Rule #2. No personal attacks!
http://www.toyota-4runner.org/showthread.php?s=&threadid=5809

 

[sharp4runr]

Did ya ever wonder why it's so common to see two race cars running at high speeds with only inches between 'em???? If so, then you must know a bit about draftin', goober.

Fourty-four: Stop the name calling. The other members are sharing their experience and insight while you seem to be expelling only hot air.

See the rules for the forum: http://www.toyota-4runner.org/showthread.php?s=&threadid=5809