CFD analysis of BRZ/FRS rear diffuser - Page 5 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

unsurety · 10-29-2014, 04:31 PM

@Wonderbar

Any CFD testing on the Type 2 diffuser?

8R6 · 10-29-2014, 04:52 PM

Quote:

Originally Posted by Wonderbar

I'm now including rubber/foam sticky strips as part of the piece just for that reason.

do you still have this rubber strip?? My HKS muffler touches the type 2 diffuser in two spots and at 1700-1900 rpms, it buzzes like crazy

troek · 11-10-2014, 07:13 AM

So what was the consensus on how low the leading edge can go before it starts to catch air?

Gunman · 11-10-2014, 11:54 AM

Quote:

Originally Posted by troek

So what was the consensus on how low the leading edge can go before it starts to catch air?

My gut, and how I mounted mine, is to keep the leading edge as close to flush with the subframe, and everything forward of the diffuser.

troek · 11-11-2014, 02:33 AM

yeah, thats what im thinking. i have a home made diffuser, and a tad lower than the suspension arms, and just a bit higher than the bottom of the rear diff. but that is still higher off the ground than the fuel tanks and what not. it hasnt ripped off at 140mph and at 80mph i still get great millage so im assuming it isnt catching any air, although i may have to do some streamer testing with a go pro.

Gunman · 11-11-2014, 06:18 AM

Quote:

Originally Posted by troek

yeah, thats what im thinking. i have a home made diffuser, and a tad lower than the suspension arms, and just a bit higher than the bottom of the rear diff. but that is still higher off the ground than the fuel tanks and what not. it hasnt ripped off at 140mph and at 80mph i still get great millage so im assuming it isnt catching any air, although i may have to do some streamer testing with a go pro.

Engine assembly lube works too. A few drops on the surfaces in question, drive it, and then follow the oil streaks. No need for the GoPro then.

troek · 11-11-2014, 05:29 PM

Quote:

Originally Posted by Gunman

Engine assembly lube works too. A few drops on the surfaces in question, drive it, and then follow the oil streaks. No need for the GoPro then.

good tip.

back to the wangan this weekend lol.

Wonderbar · 11-13-2014, 11:05 PM

Quote:

Originally Posted by BRGT86

do you still have this rubber strip?? My HKS muffler touches the type 2 diffuser in two spots and at 1700-1900 rpms, it buzzes like crazy

I can send you some when I get home, or you can use any foam weather strip from your local hardware or auto parts store. It's pretty much the same thing I use.

8R6 · 11-14-2014, 03:04 PM

Quote:

Originally Posted by Wonderbar

I can send you some when I get home, or you can use any foam weather strip from your local hardware or auto parts store. It's pretty much the same thing I use.

i dont mind getting some on my own, but my biggest concern was getting one that can withstand the heat temperature from a hot muffler and not melt lol

Wonderbar · 11-14-2014, 07:02 PM

The mufflers don't get that hot where you're looking at putting it @BRGT86

8R6 · 11-14-2014, 07:14 PM

Quote:

Originally Posted by Wonderbar

The mufflers don't get that hot where you're looking at putting it @BRGT86

oh werd. cool ill go pick some up then. thanks again man!

Hoosier Daddy · 11-17-2014, 12:05 PM

Is the mesh available?

Wonderbar · 11-17-2014, 03:37 PM

Quote:

Originally Posted by Hoosier Daddy

Is the mesh available?

Mesh?

Hoosier Daddy · 11-21-2014, 04:43 PM

Yes, the CFD mesh file used for computation.

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11-17-2014, 12:05 PM	#68
Hoosier Daddy Member Join Date: Nov 2014 Drives: '13 Denali, '15 Volt, soon a BRZ? Location: CLT Posts: 61 Thanks: 3 Thanked 55 Times in 23 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Is the mesh available?

11-21-2014, 04:43 PM	#70
Hoosier Daddy Member Join Date: Nov 2014 Drives: '13 Denali, '15 Volt, soon a BRZ? Location: CLT Posts: 61 Thanks: 3 Thanked 55 Times in 23 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Yes, the CFD mesh file used for computation.

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