Zspeed Undertray and Brake Ducting

OptionZero · 07-21-2019, 10:59 PM

Casually reading through some threads about brake cooling and noticed that an issue popped up was how to install brake ducts for bumpers other than the ones Stillen is pre-made for ('09-12 factory bumper + Stillen facia) or Nismo (RC or copy thereof from Synergy or Finite)

I have a 2015+ Nismo. There's no off-the-shelf solution for hooking up brake ducts without hacking up the bumper for some universal ducts.

For a race car, no problem:

Doesn't look half bad

But is there a solution without hacking?

Then I found this thread:
Nismo bumper brake duct install

Basically, this dude mounted some NACA ducts on his Zspeed undertray. Wicked solution

However, when i see the 2015+ nismo zspeed tray, it has this dip in the middle:

So i was thinking?

Why not cut a couple holes as pictures here:

Rivet on these:

Connect the hoses, and viola?

Could even put some mesh in between the opening and the flange to block rocks

conceptually . . . would that spot pick up enough air to be worthwhile?

BettyZ · 07-22-2019, 07:29 AM

Quote:

Originally Posted by OptionZero

Casually reading through some threads about brake cooling and noticed that an issue popped up was how to install brake ducts for bumpers other than the ones Stillen is pre-made for ('09-12 factory bumper + Stillen facia) or Nismo (RC or copy thereof from Synergy or Finite)

I have a 2015+ Nismo. There's no off-the-shelf solution for hooking up brake ducts without hacking up the bumper for some universal ducts.

For a race car, no problem:

Doesn't look half bad

But is there a solution without hacking?

Then I found this thread:
Nismo bumper brake duct install

Basically, this dude mounted some NACA ducts on his Zspeed undertray. Wicked solution

However, when i see the 2015+ nismo zspeed tray, it has this dip in the middle:

So i was thinking?

Why not cut a couple holes as pictures here:

Rivet on these:

Connect the hoses, and viola?

Could even put some mesh in between the opening and the flange to block rocks

conceptually . . . would that spot pick up enough air to be worthwhile?

It likely would. The Zspeed shroud for my '14 Nismo has a 6 inch slot cut in that slant to allow airflow over the bottom of the oil pan. Don't think they'd put it there if it wouldn't work...

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Spooler · 07-22-2019, 11:04 AM

Yeah, that thread that the guy installed NACA ducts into his undertray was a great idea. I don't see why couldn't do what you are thinking. The only question would be airflow, are you going to have enough.

OptionZero · 07-22-2019, 11:28 AM

Yup, thats what i was worried about

Alternatively, i could try to just mount the naca duct on the flat side like that guy, it's just a matter of whether theres enough space to do it. The Nismo v1 has massive surface area

i dont have any components in hand to measure anything, i'm just spit balling based on what i can find diagrams of

Rusty · 07-22-2019, 03:11 PM

I have 2 of those duct pieces for 3" hose if you want them. $10 for both plus shipping. PM me.

OptionZero · 07-22-2019, 10:49 PM

After studying more pix, my concern is that the holes i put on the diagram will be right near the oilpan

Anyone know how much clearance there is behind that sloped part of the undertray?

Rusty · 07-22-2019, 11:29 PM

Quote:

Originally Posted by OptionZero

After studying more pix, my concern is that the holes i put on the diagram will be right near the oilpan

Anyone know how much clearance there is behind that sloped part of the undertray?

The oil pan is there. I don't know what the dimension is right there. You might not have enough to use a 2" hose without ovaling it.

Elmo370z · 07-23-2019, 12:26 AM

Sub’d

Elmo370z · 07-23-2019, 12:28 AM

Just do this

jchammond · 07-23-2019, 12:52 AM

Quote:

Originally Posted by Elmo370z

Just do this

He’s got one that looks like this; unsure surface area on these

Elmo370z · 07-23-2019, 01:07 AM

Quote:

Originally Posted by jchammond

He’s got one that looks like this; unsure surface area on these

Go right under the drl’s.

OptionZero · 07-23-2019, 01:13 AM

Quote:

Originally Posted by Elmo370z

Just do this

If I had that version of the nismo it would be that simple

I'd rather not cut up a 2015+ nismo atm

If it came to it, I'd put a NACA duct as you described right under the dyrl

Elmo370z · 07-23-2019, 11:07 AM

Quote:

Originally Posted by OptionZero

If I had that version of the nismo it would be that simple

I'd rather not cut up a 2015+ nismo atm

If it came to it, I'd put a NACA duct as you described right under the dyrl

Only real way to see if they work if to buy a heat gun and test before and after

cv129 · 07-23-2019, 11:26 AM

Before going through the custom duct work, maybe cut the hole where indicated, and mount a small handheld anemometer there to see what kind of wind speed you get in that opening?

Also, I would think having fender vents (like the Nismo GTR ones, or the FE Design ones) may help with drawing air from under? After all, reducing air pressure in the wheel well makes it easier for fresh air to enter. Just a speculation.

ValidusVentus · 09-27-2019, 01:52 PM

Just keep in mind a big driver of airflow in this case is the pressure difference between the inlet and outlet, not just the air velocity aimed at the inlet. I doubt very much that the pressure at that point [on the undertray] is anywhere near as high as the front surface of the fascia. I mean I could be wrong but...

07-21-2019, 10:59 PM	#1 (permalink)
OptionZero A True Z Fanatic Join Date: Apr 2011 Location: Sacramento Posts: 3,270 Drives: 15 370Z Nismo 6MT Rep Power: 214101	Zspeed Undertray and Brake Ducting Casually reading through some threads about brake cooling and noticed that an issue popped up was how to install brake ducts for bumpers other than the ones Stillen is pre-made for ('09-12 factory bumper + Stillen facia) or Nismo (RC or copy thereof from Synergy or Finite) I have a 2015+ Nismo. There's no off-the-shelf solution for hooking up brake ducts without hacking up the bumper for some universal ducts. For a race car, no problem: Doesn't look half bad But is there a solution without hacking? Then I found this thread: Nismo bumper brake duct install Basically, this dude mounted some NACA ducts on his Zspeed undertray. Wicked solution However, when i see the 2015+ nismo zspeed tray, it has this dip in the middle: So i was thinking? Why not cut a couple holes as pictures here: Rivet on these: Connect the hoses, and viola? Could even put some mesh in between the opening and the flange to block rocks conceptually . . . would that spot pick up enough air to be worthwhile? BettyZ likes this. __________________ OptionZero Build Thread Last edited by OptionZero; 07-21-2019 at 11:01 PM.

07-22-2019, 11:04 AM	#3 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 14,137 Drives: 2013 Nismo 370z Rep Power: 2684394	Yeah, that thread that the guy installed NACA ducts into his undertray was a great idea. I don't see why couldn't do what you are thinking. The only question would be airflow, are you going to have enough. Rusty likes this.

07-22-2019, 11:28 AM	#4 (permalink)
OptionZero A True Z Fanatic Join Date: Apr 2011 Location: Sacramento Posts: 3,270 Drives: 15 370Z Nismo 6MT Rep Power: 214101	Yup, thats what i was worried about Alternatively, i could try to just mount the naca duct on the flat side like that guy, it's just a matter of whether theres enough space to do it. The Nismo v1 has massive surface area i dont have any components in hand to measure anything, i'm just spit balling based on what i can find diagrams of __________________ OptionZero Build Thread Last edited by OptionZero; 07-22-2019 at 11:32 AM.

07-22-2019, 03:11 PM	#5 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,531 Drives: 2011 Nismo GM 6M Rep Power: 2684439	I have 2 of those duct pieces for 3" hose if you want them. $10 for both plus shipping. PM me. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

07-22-2019, 10:49 PM	#6 (permalink)
OptionZero A True Z Fanatic Join Date: Apr 2011 Location: Sacramento Posts: 3,270 Drives: 15 370Z Nismo 6MT Rep Power: 214101	After studying more pix, my concern is that the holes i put on the diagram will be right near the oilpan Anyone know how much clearance there is behind that sloped part of the undertray? __________________ OptionZero Build Thread Last edited by OptionZero; 07-22-2019 at 10:53 PM.

07-23-2019, 12:26 AM	#8 (permalink)
Elmo370z A True Z Fanatic Join Date: Apr 2013 Location: st. petersburg Posts: 5,727 Drives: 09 nissan 370z Sp M6 Rep Power: 295379	Sub’d

07-23-2019, 11:26 AM	#14 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,271 Drives: 09 Nismo, 16 Nismo Rep Power: 163996	Before going through the custom duct work, maybe cut the hole where indicated, and mount a small handheld anemometer there to see what kind of wind speed you get in that opening? Also, I would think having fender vents (like the Nismo GTR ones, or the FE Design ones) may help with drawing air from under? After all, reducing air pressure in the wheel well makes it easier for fresh air to enter. Just a speculation. Hotrodz and Elmo370z like this. __________________ Setrab \| RE-71 \| SPL \| JRZ \| Nismo \| ARK \| Whiteline \| RacingBrake \| CJM Oil Pan \| Ti shield

09-27-2019, 01:52 PM	#15 (permalink)
ValidusVentus Enthusiast Member Join Date: Jun 2011 Location: Washington State Posts: 400 Drives: #18 Z34 Rep Power: 24	Just keep in mind a big driver of airflow in this case is the pressure difference between the inlet and outlet, not just the air velocity aimed at the inlet. I doubt very much that the pressure at that point [on the undertray] is anywhere near as high as the front surface of the fascia. I mean I could be wrong but... cv129 and Rusty like this. __________________ Mods: Dedicated caged track car, lots of things. \|\|\| Valkyrie Autosport \|\|\|

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