Question about the Borla Diffuser - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ChaChas345 · 11-29-2012, 02:14 AM

Since no one was going to reply in that post I made a new one. Here is what I replied in the other post. I would love to see a better video of the Borla Exhuasts. Sucks there videos have such bad sound quality.

Quote:

Originally Posted by ChaChas345

The sound on the video is horrible. Sounds just as bad as the other video in the other section of the forums and you can barely make out the sound from the horrible quality.

My question is what is the point of the diffuser? Does it add sound or something? I dont understand since the sound is so bad in that video. Is it just for looks or is their a purpose and change the sound of the Borla Exhaust in any way.

Freeman · 11-29-2012, 02:30 AM

on a DD car i dont see the point of having a diffuser on the car. here's some links explaining diffusers

https://www.google.com/#hl=en&safe=o...w=1536&bih=669

http://en.wikipedia.org/wiki/Diffuser_(automotive)

http://www.racecar-engineering.com/t...-aerodynamics/

Grishbok · 11-29-2012, 02:43 AM

i believe i remember hearing at the booth that it was cosmetic only, and it looks to be that way. The word diffuser is perhaps misleading, it should be cosmetic cover.

The purpose of proper underbody panels, front lip, and rear diffuser are to channel airflow under the car and essentially pull the car down, adding to downforce at speed. The borla rear "diffuser" doesnt, its cosmetic.

czar07 · 11-30-2012, 03:08 AM

The Borla exhaust leaves a massive gaping hole where the old muffler used to go. The diffuser is there to cover that hole

Jason952 · 11-30-2012, 09:46 PM

still need to see a price....

ChaChas345 · 12-01-2012, 06:22 AM

Only reason why I asked was because they had a video with shit quality sound and was wondering why they would put up a video for the diffuser when you couldnt even tell. I was pretty sure it was just for cosmetics but wanted to make sure.

Another poster thought it was funny I asked but he is a negative person who really shouldnt be judging people because they ask dumb questions.

NMMI89 · 12-07-2012, 07:36 AM

Quote:

Originally Posted by Jason952

still need to see a price....

Yep. I agree. Nothing on Borla's website.

FT-86 SpeedFactory · 12-07-2012, 09:05 AM

Quote:

Originally Posted by NMMI89

Yep. I agree. Nothing on Borla's website.

They won't probably for a couple months yet. It's still being finalized.

robispec · 12-07-2012, 09:34 AM

scion/toyota/subaru really did a lot of work on the aerodynamics on this car. They use the stock rear muffler as a defacto diffuser (Mitsubishi did this on the Evo X design work also and they were awarded an international aero award for back in 08). Diffusers act BOTH to reduce drag and increase down force. This effect can favor either side of this equation to produce the results you want. The twins are VERY efficient on fuel this is due in part to the DI injectors and also to careful aero management of the air streaming around the car (and some complain that we didnt get all the cool plastic panels under the car that are part of this package). There is also a track day benefit as the car works well at the track without the addition of any kind of aftermarket aero devices(wings lips spoilers). THIS LACK OF REAR END LIFT IS VERY HARD TO ACHIEVE in a stock vehicle and the OEM designers should be thanked for their hard work. A real world example is the S2000 which NEEDS a wing just to be safe on the track above a certain speed due to rear end destabilizing lift. Sound clip aside, I think Borla should be given credit for trying to maintain the stock aero package. Their diffuser is designed to work as a replacement for the muffler/diffuser used by the OEM designers and this is shown to be needed by many who have changed their exhaust and noticed at the track a increase in rear end dynamics at higher speeds (gets light and more unsettled the faster you go). Oh the borla diffused has slightly more down force and drag due to their vertical elements which promote more efficient emptying of the air under the car (and the faster it leaves the space the lower the air pressure and the higher the down force).

wootwoot · 12-26-2012, 01:06 AM

Any word on a release date yet? If the vendors have no more info I may give them a call.... Is this going to be put in production for sure?

MiniGuy · 02-20-2013, 03:23 AM

Any update on this diffuser from Borla?

Skurj · 02-20-2013, 12:17 PM

Quote:

Originally Posted by MiniGuy

Any update on this diffuser from Borla?

Yep check their website, I saw it listed and a price I think last week.

619_FRS · 02-20-2013, 12:42 PM

Any pictures of this diffuser you guys are talking about?

Beyer Subaru · 02-20-2013, 12:48 PM

Quote:

Originally Posted by AlvinT@Borla

Borla Cat-Back™ + optional Exhaust Diffuser (combined weight 3-lbs less than factory cat-back)

Slight curve adds rigidity. Angled up ~10degrees to rear..

11-29-2012, 02:43 AM	#3
Grishbok Volunteer Fire and Rescue Join Date: Jul 2012 Drives: Ambulance... sideways. Location: No. VA Posts: 546 Thanks: 97 Thanked 350 Times in 166 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	i believe i remember hearing at the booth that it was cosmetic only, and it looks to be that way. The word diffuser is perhaps misleading, it should be cosmetic cover. The purpose of proper underbody panels, front lip, and rear diffuser are to channel airflow under the car and essentially pull the car down, adding to downforce at speed. The borla rear "diffuser" doesnt, its cosmetic. __________________ It's more fun to drive a slow car fast, than a fast car slow.

11-30-2012, 03:08 AM	#4
czar07 Senior Member Join Date: Sep 2011 Drives: '97 RSP JZZ30 GT-T Location: Australia Posts: 612 Thanks: 365 Thanked 192 Times in 101 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	The Borla exhaust leaves a massive gaping hole where the old muffler used to go. The diffuser is there to cover that hole __________________ Germans>Japanese>Italians>Americans. Unless its a Corvette.

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11-30-2012, 09:46 PM	#5
Jason952 Senior Member Join Date: Aug 2012 Drives: FR-S Location: SC Posts: 101 Thanks: 2 Thanked 43 Times in 13 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	still need to see a price....

12-01-2012, 06:22 AM	#6
ChaChas345 Banned Join Date: Nov 2012 Drives: Corolla Location: LA Posts: 89 Thanks: 5 Thanked 31 Times in 18 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Only reason why I asked was because they had a video with shit quality sound and was wondering why they would put up a video for the diffuser when you couldnt even tell. I was pretty sure it was just for cosmetics but wanted to make sure. Another poster thought it was funny I asked but he is a negative person who really shouldnt be judging people because they ask dumb questions.

12-07-2012, 09:34 AM	#9
robispec Senior Member Join Date: Oct 2012 Drives: Black frs project Location: Socal Posts: 960 Thanks: 189 Thanked 886 Times in 381 Posts Mentioned: 190 Post(s) Tagged: 1 Thread(s)	scion/toyota/subaru really did a lot of work on the aerodynamics on this car. They use the stock rear muffler as a defacto diffuser (Mitsubishi did this on the Evo X design work also and they were awarded an international aero award for back in 08). Diffusers act BOTH to reduce drag and increase down force. This effect can favor either side of this equation to produce the results you want. The twins are VERY efficient on fuel this is due in part to the DI injectors and also to careful aero management of the air streaming around the car (and some complain that we didnt get all the cool plastic panels under the car that are part of this package). There is also a track day benefit as the car works well at the track without the addition of any kind of aftermarket aero devices(wings lips spoilers). THIS LACK OF REAR END LIFT IS VERY HARD TO ACHIEVE in a stock vehicle and the OEM designers should be thanked for their hard work. A real world example is the S2000 which NEEDS a wing just to be safe on the track above a certain speed due to rear end destabilizing lift. Sound clip aside, I think Borla should be given credit for trying to maintain the stock aero package. Their diffuser is designed to work as a replacement for the muffler/diffuser used by the OEM designers and this is shown to be needed by many who have changed their exhaust and noticed at the track a increase in rear end dynamics at higher speeds (gets light and more unsettled the faster you go). Oh the borla diffused has slightly more down force and drag due to their vertical elements which promote more efficient emptying of the air under the car (and the faster it leaves the space the lower the air pressure and the higher the down force).

12-26-2012, 01:06 AM	#10
wootwoot Senior Member Join Date: Jul 2012 Drives: FRS Location: Cali Posts: 1,558 Thanks: 188 Thanked 461 Times in 264 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Any word on a release date yet? If the vendors have no more info I may give them a call.... Is this going to be put in production for sure?

02-20-2013, 12:42 PM	#13
619_FRS Senior Member Join Date: Feb 2013 Drives: Ultramarine Scion FR-S Location: San Diego, CA Posts: 121 Thanks: 143 Thanked 75 Times in 30 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Any pictures of this diffuser you guys are talking about?

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