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-   -   450HP ND Ecoboom Build (https://www.miataturbo.net/build-threads-57/450hp-nd-ecoboom-build-110754/)

tblackey Oct 16, 2025 12:23 PM

450HP ND Ecoboom Build
 
So pulled the trigger on this. I'm working with Geaux Moto on the build. This is replacing a Porsche GT4RS. I'm hoping for similar or better lap times at a significant lower running cost. We're targeting 2350lbs. Most of this they already have running on their shop car for 3 seasons now, so this should be relatively reliable as it's their 3rd or 4th build. I waffled between an LS NC, waiting for the K24 in the ND and this. In the end I wanted something lighter than the LS build, and to keep with the 4 cylinder theme of the Miata. I suspect the LS motor NC would be faster, but this should be plenty fast.

Basics of the build
2.3 Forged closed deck Ecoboost (Built by Mountune)
G30-770 Turbo
Upgraded hpfp injectors
Karcepts swaybars
Karcepts / MCS 2WNR shocks
OS Giken
Custom Verus / Geaux Moto high downforce aero
285/30/17 Vitour P1 on 17x10
DG Hardtop
AP Front Brakes, Wilwood rears
Starting with 4PT rollbar, probably will cage it at some point
AIm 7" dash
Paint is going to be Dodge Ram Hydro blue pearl

https://cimg2.ibsrv.net/gimg/www.mia...8ed9aa246.jpeg
https://cimg5.ibsrv.net/gimg/www.mia...0d7eecc430.jpg
https://cimg6.ibsrv.net/gimg/www.mia...f8ab28c7cb.jpg
https://cimg7.ibsrv.net/gimg/www.mia...a6d17a57e8.jpg
https://cimg4.ibsrv.net/gimg/www.mia...64a670b11.jpeg
https://cimg8.ibsrv.net/gimg/www.mia...508a69b65c.jpg
https://cimg0.ibsrv.net/gimg/www.mia...f1ef3ecc12.jpg
https://cimg9.ibsrv.net/gimg/www.mia...0477694f24.jpg

SimBa Oct 16, 2025 12:42 PM

Wow, cool to see something different. What trans are you running on this? I assume some sort of auto and not an h pattern?

tblackey Oct 16, 2025 12:58 PM

It’s the MT82 from the mustang (6 speed), and a Spec clutch and flywheel. Thought about the BMW DCT, but it adds about 80lbs.

RASKAR Oct 16, 2025 03:53 PM

Super rad swap and happy to hear you kept it a manual. Excited to hopefully see some on track videos once you get it out!

Z_WAAAAAZ Oct 16, 2025 06:03 PM

Super epic man, been waiting for this post haha!

Mountune builds and sells closed deck 2.3 Ecoboost blocks? That's kick ass. I thought everyone going for big power on an EB just had to go 2.0 and that the 2.3's were thrown to the wayside because of the open deck.

The fact that the MT82 can be used is kick ass too. Armand Hindrichs in TX installed an MT82 in his turbo NC but it took an incredible amount of modification to do so.

Anways, subbed!

Fireindc Oct 16, 2025 09:37 PM

Subbed for this insanity!

Satisaii Oct 16, 2025 10:24 PM

I have a 2.3 Ecoboost in a Datsun pickup. Mine is stock and automatic, but I am interested in seeing where you go with this.

I was considering upping the fuel injectors and running E85. Sounds like it may be more work than I am willing to commit to. But 400 hp would be so much fun.

tblackey Oct 25, 2025 10:53 AM

So paint has started. Dodge hydro blue pearl, anthracite accents.

https://cimg9.ibsrv.net/gimg/www.mia...2de6921f40.jpg

So the question is what hood vent to go with. A vent or a Seibon vented hood. I'm leaning to just the vent.

Option 1
https://cimg8.ibsrv.net/gimg/www.mia...469f970d68.jpg
Option 2
https://cimg9.ibsrv.net/gimg/www.mia...c86259ad53.jpg




tblackey Oct 25, 2025 11:00 AM

OK, Flares or no flares? 285/30/17 Vitour P1's
https://cimg0.ibsrv.net/gimg/www.mia...d5648264e6.jpg
https://cimg1.ibsrv.net/gimg/www.mia...aeb3198f7b.jpg
https://cimg2.ibsrv.net/gimg/www.mia...0582a40205.jpg

Z_WAAAAAZ Oct 25, 2025 12:21 PM

Oooof, that’s gonna be a gorgeous color. I’m on board with the vent too, or multiple vents? I’m sure you’ll benefit from some side vents closer to the turbo too.

Fireindc Oct 25, 2025 12:48 PM

I like the vent look too, though that seibon hood does look super functional and might be the ticket if you already have it. I bet it would look a lot better color matched.

As for flares or not, I almost always vote NOT unless the wheel/tire package you intend to run is limited - in which case flare away baby!!!

tblackey Oct 25, 2025 07:18 PM

So the tires are in the picture. They definitely poke a bit, but not sure flares are needed. I’d rather not, but I want to run the wider tires at it’s worth 1.5 sec

Fireindc Oct 25, 2025 08:54 PM

Well it looks sick as is and those tires fit better than 245s on my non flared na. But if you wanna go bigger flares it is. Looks wise I vote no flares all day long, that thing is hawt

Z_WAAAAAZ Oct 27, 2025 06:16 PM

I'm in agreeance on the no flares as well. That's actually pretty nuts that 285s can fit under the stock fenders like that. Looks mean AF.

Chilicharger665 Oct 28, 2025 09:23 AM

The custom Verus aero is pretty sweet. However, are you not going to run any of their flat underpanels or the rear diffuser?

TurboTim Oct 29, 2025 08:27 AM

No flares.

Chilicharger665 Oct 29, 2025 09:22 AM

Man, the non Abarth 124s are pretty cheap these days. They might be a better option than an ND for this kit, since the chassis is the same, but the front has an upper grille for feeding the radiator and the lower opening is already set up for an intercooler. I did check out GeauxMotos website and it appears they have a blackbox to talk with the Mazda stuff to keep the stock ABS and all that, so that wouldn't work with the Fiat. Just making a race car with their stuff should work fine, though.

tblackey Nov 18, 2025 08:33 PM

Small update
 
So 285’s fit! Wing getting done, hood vent installed
https://cimg2.ibsrv.net/gimg/www.mia...57a2f75da.jpeg
https://cimg0.ibsrv.net/gimg/www.mia...ea5a1ca42.jpeg
https://cimg9.ibsrv.net/gimg/www.mia...3f8fe2171.jpeg

tblackey Dec 4, 2025 11:22 AM

Big progress, we have paint! Waiting on the bottom end from Montune to start the mechanical build. We can start the suspension though (SPL links, MCS, AP racing brakes, OS Giken, etc...)

https://cimg9.ibsrv.net/gimg/www.mia...c5ce75d608.jpg
https://cimg0.ibsrv.net/gimg/www.mia...bcae4d8895.jpg
https://cimg1.ibsrv.net/gimg/www.mia...8b3998ad7c.jpg

TurboTim Dec 4, 2025 11:36 AM

What paint color is that? I went with a mazda blue on my jeep, looks similar.


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