Sign in

← All builds

Verwah's NC Miata Street/Track Turbo Build

Verwah · NC Miata

Mazda MX-5 Mk3 (NC)

Street/track NC build

Read the full write-up at Street/track NC build ↗

Photo: Street/track NC build

Verwah's turbocharged NC Miata, built by Dynotronics for street and track

Verwah had his NC Miata sent out to Dynotronics (built by Joe) for a full turbo engine build, which took over nine months longer than expected. Years later the owner documented tearing the car down again for a fresh long block, fuel system upgrade, and front-end cooling and aero work. The thread tracks both the original professional build and later owner-performed maintenance and upgrades.

Specs

As stated in the original write-up.

Engine
Dynotronics built 2.5L with forged rods/pistons, 9.2:1 compression
Camshaft
Integral 1.5 camshaft, FI grind
Intake manifold
Fabricated intake manifold
Turbo system
Fab9 turbo kit with Borg Warner EFR 6758, custom 3" mid-pipe, GWR Roadster sport dual exhaust
Radiator
GWR triple-pass radiator
Intercooler
Treadstone intercooler
Fuel injectors
DW 800cc injectors
Fuel pump
DW 300c fuel pump
Boost controller
Greddy Profec boost controller
Clutch
Clutchmasters FX350 clutch
Flywheel
13 lb steel flywheel
Rear end
Tomei 3.63 final drive
Suspension
Ohlins DFV dampers
Sway bars
Racing Beat sway bars and end links
Wheels
Enkei PF01SS +48
Tyres
Yokohama S-Drive 235/40/17
Hard top
Removable hard top, soft top deleted
Roll bar
Blackbird Fabworx GT3
Electrical
Track Dog Racing battery relocation kit
Interior
AutoExe steering wheel, Redline Goods shift and parking brake boot, Voodoo shift knob
Instrumentation
Aim Strada street version digital dash
Head unit
Pioneer AVIC-5000NEX
Coolant
Moroso coolant expansion tank, GWR red silicone hose kit
ECU tune
EcuTek Race Rom

Parts used

Parts named as used in the original write-up, grouped the way the Parts page groups them. Where one of the shops we index lists the same thing for this car, it is shown underneath with a link to the shop.

Engine 5

Fuel & Ignition 5

Cooling 6

Gearbox & Drivetrain 3

Suspension & Steering 2

Wheels & Tyres 2

Body & Trim 7

Interior 3

Electrical 4

Other 1

Photos

64 pictures collected from the write-up, in the order they were posted, shown from Street/track NC build. A picture opens larger here, with the way through to the page it is on.

street/track NC build - Miata Turbo Forum - Boost cars, acquire cats. 36this post at Street/track NC build ↗

Photo: Street/track NC build
Leave a poscatPhoto: Street/track NC build
Leave a negcatPhoto: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Tweet this threadPhoto: Street/track NC build

street/track NC build - Miata Turbo Forum - Boost cars, acquire cats. 28this post at Street/track NC build ↗

Engine block and intake manifold with turbo componentsPhoto: Street/track NC build
Photo: Street/track NC build
Engine cylinder head and valve cover detail close-upPhoto: Street/track NC build
Fuel rail, pressure regulator, and braided hoses assemblyPhoto: Street/track NC build
Photo: Street/track NC build
Engine bay fuel pump and line installation detailPhoto: Street/track NC build
Engine harness wiring and cable management installationPhoto: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Black coupe on lift with engine partially installedPhoto: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Completed engine bay with turbo intake and plumbingPhoto: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Front intercooler and radiator installation detail viewPhoto: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build
Photo: Street/track NC build

How it was done

Professional turbo build

The owner sent the NC Miata to Dynotronics (built by Joe) for a turbocharged 2.5L engine build with forged internals, a Fab9 turbo kit using a Borg Warner EFR 6758, fabricated intake manifold, new fuel system, suspension and wheel/tyre upgrades, and interior and cosmetic changes. The project took over nine months, far longer than planned, before the car was finished and shipped back.

Break-in and first results

After delivery the owner ran an easy break-in tune at low boost on 91 octane, then began putting on miles. A dyno session on a dynapack showed 350 whp at 7000 rpm and 320 ft-lb at 3500 rpm at about 11 psi, with plans to raise boost after the break-in period.

Later teardown and fresh long block

Years later the owner pulled the engine again, dressed a new long block with new sensors and gasket maker, and installed Dynotronics' thermostatic oil filter mount with provisions for a turbo feed line, pressure sender and cooler circuit. The valve cover was hydro dipped in a digital camo pattern by a local high school auto shop using TWN Industries film.

Fuel system and reassembly

The owner upgraded to a return-style fuel system in anticipation of running E85, sourced locally in Wisconsin. The engine and transmission were reinstalled as a unit, with care taken routing wiring, coolant lines and the steering shaft, and a hood strut added after deleting a prop rod that rubbed the intake tube.

Front end cooling and aero work

Fitting an LRB undertray, splitter brackets and an oil cooler together required trimming the tray and drilling extra holes for cooling flow since the stock cutout pattern conflicted with the splitter mounts. A loud aftermarket horn was also mounted in an unconventional spot behind the bumper due to space constraints.

Brakes acknowledged as a limitation

In response to a comment that stock brakes were not ideal for a turbo build, the owner confirmed the factory brakes and fluid were simply refreshed to OEM+ spec for now, with a balanced big brake kit planned for later once boost is increased.

A summary in our own words. The full account, with all its detail, is in the original write-up: read it at Street/track NC build ↗

Worth knowing

  • Wiring and routing details done carefully during a self-install exceed what a shop swap typically achieves
  • Mounting multiple aftermarket front-end kits together requires checking for interference between undertray, splitter and oil cooler before installation
  • A drain hole should be added when inverting a horn to prevent water collection

Street/track NC build

Read in full, all 2 pages, on 3 November 2026. The original write-up and photographs remain with their creators. This page is a catalogue in our own words, and a signpost to the source.

Read the full write-up at Street/track NC build ↗

FIND YOUR NEXT IDEA

Explore

VideosSearch videos and spoken topicsPartsFind parts from specialist storesBuildsLearn from other people’s projectsSocialsIdeas from the communityTechnical & communitiesGuides, advice and owner clubsGalleryBrowse photos and inspiration