Perth86 HKS-TRD-JDM - Page 55 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

wizzo · 04-27-2015, 01:17 AM

Is it a custom one off diffuser?

Looks good!

Pug_BRZ · 04-27-2015, 12:15 PM

This video shows the entire underbody in the semi-street spec of the Griffon before they went really hardcore. It was a nod towards what would become the 14R60.

(specifically 0:44)

stevo_12v · 04-27-2015, 03:02 PM

Quote:

Originally Posted by Pug_BRZ

This video shows the entire underbody in the semi-street spec of the Griffon before they went really hardcore. It was a nod towards what would become the 14R60.

(specifically 0:44)

Ahhh damn, good spot! That piece looks like it would be easy to fab up. I've taken a bunch of measurements while being under the car anyway. Strange it still uses the stock JDM aero panels instead of something larger and more of a 1-piece.

I'm thinking of doing a 3-part under tray for mine, with obvious vents for cooling etc. Very strange the Griffon doesn't have any venting/cooling for the diff, must cook nicely unless they have a diff cooler.

stevo_12v · 04-27-2015, 03:06 PM

Quote:

Originally Posted by wizzo

Is it a custom one off diffuser?

Looks good!

This is my 3rd iteration. I'll probably save this one for track as it is very very aggressive looking and will no doubt attract cop attention. I'll make the next one out of 1.6mil thick aluminium also and shorten it by 50mm and fillet the sharp edges of the strakes.

Pug_BRZ · 04-27-2015, 11:29 PM

I think it just identifies the limits of what they wanted to achieve. It is still very much tied to the production car, they have simply covered up the big gaps. There are a few holes in the under tray that would allow cooling flow, and you need to remember that it has an open rear bumper (the cutout where you have your RB diffuser is open on the Griffon either side of the centre mount exhaust). I would guess that it has pretty good cooling of the diff. I have seen guys do hot-rod style louring on the under tray to increase cooling. Lots of ideas. While we can't emulate the Griffon precisely, I'm hoping to do the under tray work once I have my overall aero concept sorted.

If you go for an open bumper like the Griffon, Zele has a diff cooler already good to go that plumbs into the Cusco diff plate and sits where the stock muffler mounts.

stevo_12v · 04-28-2015, 04:42 AM

Diffuser didn't fall off, which is a good thing.
Butt dyno feels like the car picks up quicker at speed. Will have to see at the next timed track session at Barbagallo.
Took some pictures. The diffuser isn't that noticeable from a side view as it kinda mirrors the bitumen/road. If you are behind it however, thats a different story.

stevo_12v · 05-03-2015, 11:31 AM

Some more pics.

stevo_12v · 05-08-2015, 03:54 AM

Fitted the 4th and final iteration of my custom diffuser for RB faux diffuser
2mil Ali, fully enclosed underpanels starting from front of rear wheels. 90mm from ground to bottom of diffuser(axle)

Rear Side Profile

Diff Cover

Underpanel

Video
https://www.facebook.com/10000941490...6/?pnref=story

Splash guard since I removed the rear OEM pods in the wheel well.

stevo_12v · 05-08-2015, 05:36 AM

stevo_12v · 05-08-2015, 10:44 AM

Quote:

Originally Posted by AznKirby

Nice. That's what I'm planning to do as well. I've been scared of tracking my car ever since I put the Rocket Bunny rear bumper valance on. That shit flaps in the wind like crazy

Fixed.

DustinS · 05-08-2015, 11:54 AM

One of the best diffusers I have seen yet. I really want to get a more aggressive diffuser set-up for my cut bumper. Keep up the great work!!

stevo_12v · 05-08-2015, 12:42 PM

Quote:

Originally Posted by DustinS

One of the best diffusers I have seen yet. I really want to get a more aggressive diffuser set-up for my cut bumper. Keep up the great work!!

You got a pic of your cut bumper?
I got a spare one.. which I will be experimenting on. How is yours cut?

DustinS · 05-08-2015, 12:50 PM

I took the rear bumper beam out as well.

edit: more recent photo"

stevo_12v · 05-09-2015, 01:00 AM

Quote:

Originally Posted by DustinS

I took the rear bumper beam out as well.

edit: more recent photo"

That's actually much more functional with that grey section cut out, as the underflowing air still passes through the subframe with that design getting caught up in the parachute oem bumper. Or otherwise in between or aft the rear wheels.
Am I right in assuming that car felt faster on the butt dyno too?

05-08-2015, 11:54 AM	#767
DustinS Senior Member Join Date: Apr 2014 Drives: 2013 Ultramarine FR-S Location: Springfield, MO Posts: 1,947 Thanks: 2,538 Thanked 1,405 Times in 803 Posts Mentioned: 31 Post(s) Tagged: 3 Thread(s)	One of the best diffusers I have seen yet. I really want to get a more aggressive diffuser set-up for my cut bumper. Keep up the great work!! __________________

05-08-2015, 12:50 PM	#769
DustinS Senior Member Join Date: Apr 2014 Drives: 2013 Ultramarine FR-S Location: Springfield, MO Posts: 1,947 Thanks: 2,538 Thanked 1,405 Times in 803 Posts Mentioned: 31 Post(s) Tagged: 3 Thread(s)	I took the rear bumper beam out as well. edit: more recent photo" __________________

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04-27-2015, 01:17 AM	#757
wizzo Member Join Date: Jun 2014 Drives: 2014 Toyota 86 Location: Dubai, UAE Posts: 84 Thanks: 2 Thanked 17 Times in 14 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Is it a custom one off diffuser? Looks good!

04-27-2015, 12:15 PM	#758
Pug_BRZ Member Join Date: Nov 2014 Drives: WRB Subaru BRZ Location: Australia Posts: 26 Thanks: 9 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	This video shows the entire underbody in the semi-street spec of the Griffon before they went really hardcore. It was a nod towards what would become the 14R60. (specifically 0:44)

04-27-2015, 11:29 PM	#761
Pug_BRZ Member Join Date: Nov 2014 Drives: WRB Subaru BRZ Location: Australia Posts: 26 Thanks: 9 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I think it just identifies the limits of what they wanted to achieve. It is still very much tied to the production car, they have simply covered up the big gaps. There are a few holes in the under tray that would allow cooling flow, and you need to remember that it has an open rear bumper (the cutout where you have your RB diffuser is open on the Griffon either side of the centre mount exhaust). I would guess that it has pretty good cooling of the diff. I have seen guys do hot-rod style louring on the under tray to increase cooling. Lots of ideas. While we can't emulate the Griffon precisely, I'm hoping to do the under tray work once I have my overall aero concept sorted. If you go for an open bumper like the Griffon, Zele has a diff cooler already good to go that plumbs into the Cusco diff plate and sits where the stock muffler mounts.

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