|
Tracking / Autocross / HPDE / Drifting What these cars were built for! |
|
Thread Tools | Search this Thread |
11-17-2020, 08:09 AM | #1 |
Senior Member
Join Date: Sep 2020
Drives: FR-S
Location: USA
Posts: 171
Thanks: 313
Thanked 70 Times in 50 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Aerodynamic penalty for removing factory muffler
I'm thinking of getting a single exit exhaust and won't be able to fill the gap left behind with any type of diffuser or paneling.
Do we know how much of an aerodynamic penalty there is when replacing the factory muffler with anything other than another OE shape/sized muffler? |
11-17-2020, 09:10 AM | #2 |
Purist
Join Date: Oct 2016
Drives: 2013 FRS - Hot Lava
Location: Milwaukee WI
Posts: 446
Thanks: 37
Thanked 228 Times in 135 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Verus Engineering
__________________
WTB: Everything Verus
RaceComp SS-1, Complete SuperPro bushings, TR Motorsport FF10 17x9 +45, GruppeS UEL, HKS Hi-Power V2, OFT(93/E85) |
11-17-2020, 09:28 AM | #3 |
Senior Member
Join Date: Sep 2020
Drives: FR-S
Location: USA
Posts: 171
Thanks: 313
Thanked 70 Times in 50 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
|
11-17-2020, 10:03 AM | #4 |
Purist
Join Date: Oct 2016
Drives: 2013 FRS - Hot Lava
Location: Milwaukee WI
Posts: 446
Thanks: 37
Thanked 228 Times in 135 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Oh, race rules are involved. Well I can say many many people have ripped off their factory muffler, even racecars. I understand your concern about drag, but I believe the effects are minimal.
__________________
WTB: Everything Verus
RaceComp SS-1, Complete SuperPro bushings, TR Motorsport FF10 17x9 +45, GruppeS UEL, HKS Hi-Power V2, OFT(93/E85) |
11-17-2020, 10:11 AM | #5 | |
Senior Member
Join Date: Sep 2020
Drives: FR-S
Location: USA
Posts: 171
Thanks: 313
Thanked 70 Times in 50 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Right, primarily concerned about drag or if the rear-end starts feeling floaty at certain speeds. At the tracks I've been to so far, I can't see myself going higher than 110mph but I don't know if I'll end up at a higher speed track. |
|
11-17-2020, 11:36 AM | #6 |
Senior Member
Join Date: May 2020
Drives: 22 BRZ limited
Location: Clarksville TN
Posts: 1,183
Thanks: 217
Thanked 990 Times in 521 Posts
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
|
Could you make a coroplast flap that isn't a diffuser?
|
11-17-2020, 11:41 AM | #7 |
Rust bucket enthusiast
Join Date: Feb 2017
Drives: 2013 Turbo Firestorm FRS
Location: Vermont
Posts: 3,934
Thanks: 3,200
Thanked 4,095 Times in 2,045 Posts
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
|
Do they let you cut the rear bumper? A lot of people cut that black plastic section off
|
11-17-2020, 03:19 PM | #8 | |
Senior Member
Join Date: Sep 2020
Drives: FR-S
Location: USA
Posts: 171
Thanks: 313
Thanked 70 Times in 50 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Decent ideas, but those mods won't be allowed. I think I'll just assume that the weight reduction from a single exit outweighs any aerodynamic drag or lift that might be generated. |
|
The Following 2 Users Say Thank You to SCFD For This Useful Post: | DarkPira7e (11-17-2020), dragoontwo (11-17-2020) |
11-18-2020, 12:07 AM | #9 |
Senior Member
Join Date: May 2020
Drives: 2017 BRZ series.yellow
Location: Idaho
Posts: 195
Thanks: 105
Thanked 155 Times in 79 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Ya know, if the rear section of the factory heat shield beneath the trunk broke loose and got lodged against the bottom of the bumper....
|
The Following 3 Users Say Thank You to Breezio For This Useful Post: |
11-18-2020, 02:00 AM | #10 |
Senior Member
Join Date: Jun 2012
Drives: Nevermorange FRS
Location: Seattle, WA
Posts: 4,160
Thanks: 755
Thanked 4,200 Times in 1,803 Posts
Mentioned: 77 Post(s)
Tagged: 1 Thread(s)
|
It’s 6 of one and half a dozen of the other. Sure, there’s a penalty but judging by the trap speeds at the Runoffs, it’s negligible and removing that heavy muffler allows you to better distribute weight were it can benefit you more.
What rules? What class?
__________________
SCCA T4 - FRS
|
11-18-2020, 12:11 PM | #11 | |
Senior Member
Join Date: Sep 2020
Drives: FR-S
Location: USA
Posts: 171
Thanks: 313
Thanked 70 Times in 50 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I'm going to be building around SCCA D Street rules but also plan on running OTA, a local time attack series which classes cars based on performance index points for mods. |
|
11-18-2020, 12:39 PM | #12 | |
Senior Member
Join Date: Jun 2012
Drives: Nevermorange FRS
Location: Seattle, WA
Posts: 4,160
Thanks: 755
Thanked 4,200 Times in 1,803 Posts
Mentioned: 77 Post(s)
Tagged: 1 Thread(s)
|
Quote:
https://www.counterspacegarage.com/c...tition-exhaust That may be the droid you're looking for.
__________________
SCCA T4 - FRS
|
|
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Weight penalty with meaty wheel look | StraightOuttaCanadaEh | Wheels | Tires | Spacers | Hub -- Sponsored by The Tire Rack | 44 | 09-04-2018 11:09 PM |
Stock OEM Factory Muffler - Toyota 86 GT | FRS2017 | Engine, Exhaust, Transmission | 0 | 04-22-2017 06:03 AM |
What is the penalty for . . . ? | calieigh | Off-Topic Lounge [WARNING: NO POLITICS] | 1 | 02-23-2010 11:54 AM |