hey i think it called differnsers or something but you do truly think it will help i mean i dont thing enough air would slow you down not even hundred of a second maybe in an hurrcaine or sumthing...worse thing maybe bumper gte pulled off which i doubt,what do you guys think?

 

bump

 

diffusers.
Their practicality has been argued about over and over.
For a street car, I think they look stupid. Use a little imagination and some hard work and you can create panels back there to deflect air, before it can get trapped

 

i dont see a point at all they do look prety dump to me

 

at high speeds your rear bumper acts as a parachute, so cutting holes releaves this affect. i've though about cutting 3 circles on each side, but i can't bring myself to do it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16hybridsol &raquo;</TD></TR><TR><TD CLASS="quote">at high speeds your rear bumper acts as a parachute, so cutting holes releaves this affect. i've though about cutting 3 circles on each side, but i can't bring myself to do it</TD></TR></TABLE> if its acting as a parachite i think the worse thing to happen os that its going to fall of not slow you down...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastAllmotorLsVtec &raquo;</TD></TR><TR><TD CLASS="quote"> if its acting as a parachite i think the worse thing to happen os that its going to fall of not slow you down...</TD></TR></TABLE>
It's resistance, at higher speeds they will make a difference. Either re-route the trapped air behind the bumper or release it through holes.

Hole-saws work good if you don't want to use a diffuser plate.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastAllmotorLsVtec &raquo;</TD></TR><TR><TD CLASS="quote"> if its acting as a parachite i think the worse thing to happen os that its going to fall of not slow you down...</TD></TR></TABLE>

Ok i dont know how your bumper is held on but i know mine will slow me down not fall off. When air travels under the bottom of your car when it reaches the end it shoots up into the bumper. This will cause your car to slow down. Its not enough air to rip the bumper off but its enough to slow you down.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastAllmotorLsVtec &raquo;</TD></TR><TR><TD CLASS="quote"> if its acting as a parachite i think the worse thing to happen os that its going to fall of not slow you down...</TD></TR></TABLE>
no comment

 

I AGREE WITH SQUIRREL , IT'S NOT LIKE YOUR RUNNING A 9SEC. TOP FUEL CAR , PLUS THE WHOLE POINT IS TO BE INNOVATIVE ENOUGH TO FIGURE OUT THE BEST AERODYNAMICS FOR YOUR VEHICLE AND WHAT YOUR TRYING TO ACCOMPLISH , CUTTING HOLES IN YOUR BUMPER , THOUGH IT MAKES SOME SENSE , LOOKS RETARDED AND DOESN'T SOLVE YOUR PROBLEM , REALLY IT CAN ONLY HELP YOU IF YOUR TRAVLING AT A VERY ACCELERATED RATE OF SPPED , YOUR NORMAL 4BANGER IS ONLY GOING TO TRAVEL BETWEEN 20 AND THIRTY FEET PER SECOND AT BEST THEREFORE THE WIND RESISTANCE IS NOT THAT GREAT AND MOST IS DEFLECTED BY THE FRONT OF YOUR VEHICLE ANYWAYS , TRY MAKING A WICKER BILL OR CUNARD SETUP FOR UNDER YOUR BUMPER INSTEAD , THAT WAY YOU AHIEVE WHAT YOUR TRYING FOR , AND YOU DON'T LOOK LIKE A CRUISE PEDRIGON WANNABE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bb4lude &raquo;</TD></TR><TR><TD CLASS="quote">I AGREE WITH SQUIRREL , IT'S NOT LIKE YOUR RUNNING A 9SEC. TOP FUEL CAR , PLUS THE WHOLE POINT IS TO BE INNOVATIVE ENOUGH TO FIGURE OUT THE BEST AERODYNAMICS FOR YOUR VEHICLE AND WHAT YOUR TRYING TO ACCOMPLISH , CUTTING HOLES IN YOUR BUMPER , THOUGH IT MAKES SOME SENSE , LOOKS RETARDED AND DOESN'T SOLVE YOUR PROBLEM , REALLY IT CAN ONLY HELP YOU IF YOUR TRAVLING AT A VERY ACCELERATED RATE OF SPPED , YOUR NORMAL 4BANGER IS ONLY GOING TO TRAVEL BETWEEN 20 AND THIRTY FEET PER SECOND AT BEST THEREFORE THE WIND RESISTANCE IS NOT THAT GREAT AND MOST IS DEFLECTED BY THE FRONT OF YOUR VEHICLE ANYWAYS , TRY MAKING A WICKER BILL OR CUNARD SETUP FOR UNDER YOUR BUMPER INSTEAD , THAT WAY YOU AHIEVE WHAT YOUR TRYING FOR , AND YOU DON'T LOOK LIKE A CRUISE PEDRIGON WANNABE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</TD></TR></TABLE>

ya...i dont think it slows you down enough to even slow you down

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bb4lude &raquo;</TD></TR><TR><TD CLASS="quote">I AGREE WITH SQUIRREL , IT'S NOT LIKE YOUR RUNNING A 9SEC. TOP FUEL CAR , PLUS THE WHOLE POINT IS TO BE INNOVATIVE ENOUGH TO FIGURE OUT THE BEST AERODYNAMICS FOR YOUR VEHICLE AND WHAT YOUR TRYING TO ACCOMPLISH , CUTTING HOLES IN YOUR BUMPER , THOUGH IT MAKES SOME SENSE , LOOKS RETARDED AND DOESN'T SOLVE YOUR PROBLEM , REALLY IT CAN ONLY HELP YOU IF YOUR TRAVLING AT A VERY ACCELERATED RATE OF SPPED , YOUR NORMAL 4BANGER IS ONLY GOING TO TRAVEL BETWEEN 20 AND THIRTY FEET PER SECOND AT BEST THEREFORE THE WIND RESISTANCE IS NOT THAT GREAT AND MOST IS DEFLECTED BY THE FRONT OF YOUR VEHICLE ANYWAYS , TRY MAKING A WICKER BILL OR CUNARD SETUP FOR UNDER YOUR BUMPER INSTEAD , THAT WAY YOU AHIEVE WHAT YOUR TRYING FOR , AND YOU DON'T LOOK LIKE A CRUISE PEDRIGON WANNABE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</TD></TR></TABLE>
wow, first off caps off. secondjust because the front of the car breaks the wind doesn't mean it just disappears, it breaks it so the it flows to the top, sides, and guess where else, thats right the bottom. Now if you look under the car in the back you'll notice that the bumpers shape is like a cup kinda, now imagineholding a cup out the window while going like 100, its not the exact same conditions as the rear bumper situation but its close enough to show that its going to catch some air and pull your arm out of it socket. this is just one way to solve the problem, there are others, but this is what he asked about so this is what we are explaining. And who said anything about cruise pedrigon? how long did it take you to think that one up, you coulda spent all that time erasing the bullshit you wrote turning off the caps lock key, and rewriting something that somebody might want to actually pay attention to

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastAllmotorLsVtec &raquo;</TD></TR><TR><TD CLASS="quote">

ya...i dont think it slows you down enough to even slow you down</TD></TR></TABLE>
On some cars removing the rear bumper can drop your ET .2-.3 in the 1/4 just from releasing the air trapped under there. It's been tested and proven locally at our track *cough* Mista Bone *cough*. You might think it looks gay on street cars but I'm building a drag car and am more concerned with function.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GITWIDIT &raquo;</TD></TR><TR><TD CLASS="quote">
Either re-route the trapped air behind the bumper or release it through holes.</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bb4lude &raquo;</TD></TR><TR><TD CLASS="quote">YOUR NORMAL 4BANGER IS ONLY GOING TO TRAVEL BETWEEN 20 AND THIRTY FEET PER SECOND AT BEST THEREFORE THE WIND RESISTANCE IS NOT THAT GREAT</TD></TR></TABLE>

By the way, 30 feet per second is like 20 miles an hour... c'mon dude, check your math if you're going to use it to support an argument.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GITWIDIT &raquo;</TD></TR><TR><TD CLASS="quote">
On some cars removing the rear bumper can drop your ET .2-.3 in the 1/4 just from releasing the air trapped under there. It's been tested and proven locally at our track *cough* Mista Bone *cough*. You might think it looks gay on street cars but I'm building a drag car and am more concerned with function.
</TD></TR></TABLE>

Dude are you serious? I'm not doubting you, but give me the source of your info. I want to know. If that's the case, then it should help gas mileage also; right? I do a lot of freeway driving, in So Cal. If that help me get 1 more MPG, then I don't care what it looks like; I'm cutting holes in the bumper. If it is a minor or unrealized difference, then it does kind of look very bling. Please let me know if it will help MPG as well?
Thx

 

i rather reroute the air like get an low lip and slippter

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GITWIDIT &raquo;</TD></TR><TR><TD CLASS="quote">
On some cars removing the rear bumper can drop your ET .2-.3 in the 1/4 just from releasing the air trapped under there. It's been tested and proven locally at our track *cough* Mista Bone *cough*. You might think it looks gay on street cars but I'm building a drag car and am more concerned with function.

</TD></TR></TABLE>

i better try this set up then ... and see if it makes a difference.

 

ya if it does tell us

 

You can always tell those who don't know anything about aerodynamics when they bring up top fuel drag cars, or that we drive street cars.

Hate to break it to anyone, but aerodynamics starts to play a large roll above 50mph.

 

after 50pmh are you sure on that or are you foolin us

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FastAllmotorLsVtec &raquo;</TD></TR><TR><TD CLASS="quote">after 50pmh are you sure on that or are you foolin us</TD></TR></TABLE>
why wouldn't they

 

seems to soon when i here 120mph

 

I don't know why people feel the need to comment on things they know so little about.

You do know from the factory our cars are AERO limited. That means that before we can reach the top of a gearing limitations there is more aero resistance pushing on the car than there is horsepower to overcome it.

That also means that the faster you go, the more horsepower it takes to sustain a given speed.

Also keep in mind that when you double your speed, the aerodynamic force acting on a given point in your car QUADRUPLES.

So the coefficent of drag at 10mph, is going to be four times greater at 20mph, and is going to be four times greater at 40mph, and another FOUR times greater at 80mph.

Go to the library and pick up some books on aerodynamics.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">I don't know why people feel the need to comment on things they know so little about.

You do know from the factory our cars are AERO limited. That means that before we can reach the top of a gearing limitations there is more aero resistance pushing on the car than there is horsepower to overcome it.

That also means that the faster you go, the more horsepower it takes to sustain a given speed.

Also keep in mind that when you double your speed, the aerodynamic force acting on a given point in your car QUADRUPLES.

So the coefficent of drag at 10mph, is going to be four times greater at 20mph, and is going to be four times greater at 40mph, and another FOUR times greater at 80mph.

Go to the library and pick up some books on aerodynamics.
</TD></TR></TABLE>

WoW

that is great I always thought something like that but I can't bring myself to cut holes for a difuzser back there and none look good enough

but I am goignt o see if I can figure soemthing to deflect the air by the fuel tank as after that is where it should be changing towards the bumper as u all say

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16hybridsol &raquo;</TD></TR><TR><TD CLASS="quote">at high speeds your rear bumper acts as a parachute, so cutting holes releaves this affect. i've though about cutting 3 circles on each side, but i can't bring myself to do it</TD></TR></TABLE>

I didn't think that this even needed explaing, sadly it seems that it did.
-PHiZ