follow ft86club on our blog, twitter or facebook.
FT86CLUB
Ft86Club
Delicious Tuning
Register Garage Members List Calendar Search Today's Posts Mark Forums Read

Go Back   Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB > Off-Topic Discussions > Other Vehicles & General Automotive Discussions

Other Vehicles & General Automotive Discussions Discuss all other cars and automotive news here.


User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-29-2012, 11:55 PM   #1
dem00n
Member of the year - 2016
 
dem00n's Avatar
 
Join Date: Jul 2012
Drives: Scion FRS
Location: New York
Posts: 3,575
Thanks: 788
Thanked 2,427 Times in 1,111 Posts
Mentioned: 23 Post(s)
Tagged: 0 Thread(s)
Why do people with Honda Civics drill holes on the rear bumper?

Is it to save weight?
I don't even...
dem00n is offline   Reply With Quote
Old 11-30-2012, 12:02 AM   #2
serialk11r
Senior Member
 
Join Date: Mar 2011
Drives: '06 AM V8V Coupe
Location: United States of America
Posts: 5,279
Thanks: 285
Thanked 1,074 Times in 759 Posts
Mentioned: 13 Post(s)
Tagged: 1 Thread(s)
Garage
I think it's to "decrease drag" (it probably does nothing at all, no harm no gain).
serialk11r is offline   Reply With Quote
Old 11-30-2012, 12:15 AM   #3
chulooz
Registered you sir
 
chulooz's Avatar
 
Join Date: Feb 2010
Drives: 99 impreza coupe
Location: DC / CT
Posts: 1,666
Thanks: 259
Thanked 380 Times in 207 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
^Yep, air pressure 'behind/inside' the rear bumper. Ive never looked into the facts either.
chulooz is offline   Reply With Quote
Old 11-30-2012, 12:15 AM   #4
Superhatch
AIM4APX
 
Superhatch's Avatar
 
Join Date: Jun 2012
Drives: 2013 WRB BRZ Limited
Location: Milwaukee
Posts: 1,206
Thanks: 642
Thanked 749 Times in 324 Posts
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
http://www.d-series.org/forums/1666178-post1.html

Rather than making a diffuser they just cut holes in the bumper to try and get the airflow under the car to cleanly escape the rear rather than creating turbulence by catching on the rear bumper.

I've heard it makes a difference, and some hard core Honda drag guys swear by it, others hit 9's w/o them at all, so not really sure what they are worth.
__________________
"It's very difficult to present technology as an overtly positive sales device to people who want an emotional car" -Chris Harris
Superhatch is offline   Reply With Quote
Old 11-30-2012, 12:17 AM   #5
ImAwesome
Senior Member
 
Join Date: Jun 2012
Drives: 99' M3, 13' SWP Brz
Location: Durham/Pinehurst, NC
Posts: 346
Thanks: 89
Thanked 85 Times in 67 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
yup, they are called 'speed holes' they release pressure from the high pressure area created by the open area in the bumper
ImAwesome is offline   Reply With Quote
Old 11-30-2012, 12:24 AM   #6
Dave-ROR
Site Moderator
 
Dave-ROR's Avatar
 
Join Date: Dec 2010
Drives: Stuff
Location: Florida
Posts: 10,317
Thanks: 955
Thanked 5,965 Times in 2,689 Posts
Mentioned: 262 Post(s)
Tagged: 8 Thread(s)
We put them in our race cars bumper as a joke. We also put LEDs behind it to make others laugh during overnight races.

Does it do anything, well the bumper no longer flexes and bends around, so maybe. I haven't noticed any difference from that though so probably not. We were bored. :shrug:
__________________
-Dave
Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback
DD: 2005 Acura TSX
Tow: 2022 F-450
Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4
Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX
Projects: 2013 Subaru BRZ Limited track car build
FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles
Dave-ROR is offline   Reply With Quote
Old 11-30-2012, 12:42 AM   #7
serialk11r
Senior Member
 
Join Date: Mar 2011
Drives: '06 AM V8V Coupe
Location: United States of America
Posts: 5,279
Thanks: 285
Thanked 1,074 Times in 759 Posts
Mentioned: 13 Post(s)
Tagged: 1 Thread(s)
Garage
There typically isn't a "high pressure" area behind the bumper because not enough airflow makes it under the car and to the rear.

If it were so easy to reduce drag, don't you think manufacturers would just put the bumper 2 inches higher, maybe save some material costs in the process?
serialk11r is offline   Reply With Quote
Old 11-30-2012, 07:16 AM   #8
GTB/ZR-1
Senior Member
 
GTB/ZR-1's Avatar
 
Join Date: Oct 2012
Drives: '13 BRZ in WRB--let's mod!!!
Location: Central, FL
Posts: 1,224
Thanks: 317
Thanked 449 Times in 262 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
JDM, yo! lol
GTB/ZR-1 is offline   Reply With Quote
Old 12-02-2012, 09:56 PM   #9
ANTI_LAG
Senior Member
 
ANTI_LAG's Avatar
 
Join Date: Jul 2012
Drives: Ones with Big Turbos
Location: Houston, Texas
Posts: 182
Thanks: 0
Thanked 153 Times in 68 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
On our honda drag cars we have this, we pick up mph on the top end due to drag release, seeing how our car runs in the 160-170mph trap you could understand why this would be helpful.
ANTI_LAG is offline   Reply With Quote
Old 12-12-2012, 11:38 AM   #10
track_warrior
Track Junkie
 
track_warrior's Avatar
 
Join Date: Mar 2012
Drives: Faster than the Stig!
Location: TX
Posts: 1,338
Thanks: 530
Thanked 770 Times in 363 Posts
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Dave-ROR View Post
We put them in our race cars bumper as a joke. We also put LEDs behind it to make others laugh during overnight races.

Does it do anything, well the bumper no longer flexes and bends around, so maybe. I haven't noticed any difference from that though so probably not. We were bored. :shrug:
The first step is admitting the problem Dave!

Cheers man
__________________
Compensating a heavy car with horsepower is like giving an alcoholic cocaine to sober him up...
track_warrior is offline   Reply With Quote
Old 12-12-2012, 12:03 PM   #11
7thgear
i'm sorry, what?
 
7thgear's Avatar
 
Join Date: Jan 2012
Drives: Canada
Location: I rock a beat harder than you can beat it with rocks
Posts: 4,399
Thanks: 357
Thanked 2,506 Times in 1,268 Posts
Mentioned: 40 Post(s)
Tagged: 3 Thread(s)
Quote:
Originally Posted by dem00n View Post
Is it to save weight?
I don't even...
it's a super low-budget diffuser

some people cut out the center section entirely
__________________
don't you think if I was wrong, I'd know it?
7thgear is offline   Reply With Quote
Old 12-12-2012, 01:17 PM   #12
gmookher
Banned
 
Join Date: Aug 2012
Drives: VortechSC,BorlaEL,Perrin,GCRace
Location: HighHeatHighAltitudeAZ,USA
Posts: 2,254
Thanks: 458
Thanked 669 Times in 394 Posts
Mentioned: 9 Post(s)
Tagged: 2 Thread(s)
I would say it but I cant. See avatar.
gmookher is offline   Reply With Quote
Old 12-12-2012, 01:22 PM   #13
Wes B.
Automotive Enthusiast
 
Wes B.'s Avatar
 
Join Date: Sep 2012
Drives: 2013 Scion FR-S
Location: United States
Posts: 458
Thanks: 166
Thanked 125 Times in 87 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by 7thgear View Post
some people cut out the center section entirely
They then go on to claim that their "modification" somehow allowed their engines to churn out 5-10 more HP.
Wes B. is offline   Reply With Quote
Old 12-12-2012, 02:04 PM   #14
Dave-ROR
Site Moderator
 
Dave-ROR's Avatar
 
Join Date: Dec 2010
Drives: Stuff
Location: Florida
Posts: 10,317
Thanks: 955
Thanked 5,965 Times in 2,689 Posts
Mentioned: 262 Post(s)
Tagged: 8 Thread(s)
Quote:
Originally Posted by pcasso87 View Post
The first step is admitting the problem Dave!

Cheers man
LOL dude we rice out the chump car all the time for s&g. Also it annoys our BMW guy, which entertains the rest of us. And you'd think the bright ass LEDs would make the car more visible.. last sebring race we still got rear ended though.
__________________
-Dave
Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback
DD: 2005 Acura TSX
Tow: 2022 F-450
Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4
Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX
Projects: 2013 Subaru BRZ Limited track car build
FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles
Dave-ROR is offline   Reply With Quote
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Toronto FR-S orders- Drill or no Drill on bumper Dragon86 CANADA 35 10-12-2012 01:35 PM
Son of a @#$*&!!! I found out my dealer drilled holes on the front bumper RYU Scion FR-S / Toyota 86 GT86 General Forum 40 09-12-2012 07:23 AM
Front license plate: Why you don't want the dealer to drill your bumper CircuitJerk Issues | Warranty | Recalls / TSB 53 08-27-2012 02:02 AM
Front bumper holes... BRZ88 BRZ First-Gen (2012+) -- General Topics 29 08-14-2012 12:19 PM
Bumper Plugs for License Plate holes by dealer? mikeg7827 Cosmetic Maintenance (Wash, Wax, Detailing, Body Repairs) 6 08-13-2012 05:33 PM


All times are GMT -4. The time now is 01:10 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.

Garage vBulletin Plugins by Drive Thru Online, Inc.