Andrew Campbell's Miata obsession runs deep. So deep the guy has clipped and archived every article from every magazine pertaining to Miatas, and he archives them in chronological order. So deep the guy rode public transportation until he could afford one. So deep he built this turbocharged 1995 model with the Ultimate Street Car Challenge in mind.
After several engine builds and turbo setups, Andrew's setup of sundry aftermarket and O.E. parts makes big power and has proven bulletproof so far. Although built with the USCC in the back of Andrew's mind, the roadster was built to excel on the streets and at the strip, so that's where the lion's share of $25-plus-K has gone.
After a couple of transactions involving our well-traveled friend, Deto Nation, Andrew had Stoid Racing complete a short block, then finished the final assembly himself. Combustion presses on forged .020-over Wiseco pistons and Crower rods spinning a '99 Miata crank with Clevite bearings wedged in between. With lots of boost on the drawing board, a main bearing girdle from an '01 Miata was installed.
More hours were spent on the cylinder head than there are in a week. Unscrew the ARP head bolts and you'll see a head that's been decked, ported, polished and flowbenched and uses cams from a '99 coupled with a solid-lifter conversion. Dual-valve springs and titanium retainers manage 1mm oversize Rev stainless intake valves and 1mm oversize Inconel exhaust valves.
Strapped onto all that beefiness is a Cartech tubular exhaust manifold supporting a big Precision Turbo Engineering SC61 T3/T4 turbo. Custom intercooler piping flows ambient air to an intercooler that uses a 20-inch-wide core from XS Engineering and end tanks designed by Andrew. Fiery hotness routes through either the Tial 35mm wastegate or straight through the 3-inch turbo-back exhaust.
The air/fuel ratio and spark timing is controlled by a Haltech E6K stand-alone computer tuned by Andrew, Chris Pott and Tony Palo. Boost, dialed to 15 psi on pump gas and 25 psi with C16, is locked in with an A'PEXi AVC-R. Planning to spend a lot of time at the dragstrip, Andrew installed a two-step rev limiter mounted on the emergency brake.
Fuel demands are met with a Walbro 255 l/hr fuel pump that pushes a river of Texan 93 octane through a Vishnu dual-feed fuel rail and into Precision 680cc injectors. The BP ignition was ditched in favor of a DIS-2 ignition from MSD, which squirts electrons into Bosch igniters and NGK plugs.
Drivetrain modifications include a KAAZ 1.5-way limited-slip differential, ACT Xtreme pressure plate and street-strip disc, a custom transmission brace and Mazdaspeed engine and diff mounts. Andrew applied the standard Miata suspension formula, using Ground Control coil-overs perched on Koni Yellow dampers. Racing Beat anti-roll bars and braces are installed front and rear. Andrew added radius arm bars at the rear to eliminate wheel hop when running BFG drag radials at the track. A Mazdaspeed strut tower brace helps to shore up the front end, but the aptly named Hard Dog Hard Core roll bar is the largest dose of Viagra supplied to the wet noodle Miata chassis.
Brakes are stock Miata, highlighting the car's straight-line focus. Wide and functional 15x8-inch Kosei KIs wear 225/50-15 Toyo RA-1s.
Remember, every point counts in USCC, including those awarded in the car show contest, and Andrew approached this tastefully. Body modifications are limited to an R-package front lip spoiler, rear lower skirt, trunk lip spoiler, a fresh coat of red paint, and, most importantly, an SCC "Let the Ass Kicking Begin" license plate frame.
The interior is a predominantly bling-free zone, featuring aftermarket items that make the car a more comfortable daily driver. Fifty-two millimeter GReddy boost, EGT, oil and coolant temperature gauges keep tabs on moody and expensive spinning things.
An Alpine deck powers Sony Mobile ES components and those nifty stock in-headrest speakers. Shininess is confined to a polished-aluminum emergency brake handle, trim rings and a polished Momo knob, which he swears he doesn't polish himself.
Andrew says his Miata makes 314-wheel hp on pump gas and 472 hp on C16 that, combined with the Miata's curb weight, should make single-turbo Supra owners nervous.
Poodle car stereotypes be damned, if luck is on his side, and Andrew's MX-5 holds together, this car could be the first Miata to win the Ultimate Street Car Challenge. Andrew is already obsessing over the idea.
1995 Mazda MiataEngineEngine Code: BPType: Inline four, cast-iron block and aluminum head, turbocharged and intercooledInternal Modifications : '99 Miata crank, balanced and polished, Clevite bearings, '01 bearing girdle, Crower rods, Wiseco 8.8:1 .020-over forged pistons, ARP head bolts, polished, ported and decked cylinder head, '99 camshafts and solid lifter conversion, Mazda Competition cam gears, REV 1mm oversize stainless instake valves, 1mm oversize Inconel exhaust valves, titanium retainers and dual valve springsExternal Modifications: Cartech exhaust manifold, Precision Turbo Engineering SC61 T3/T4 turbo, Tial 35mm wastegate, 3-in. turbo-back exhaust, 2.25-in. and 2.5-in. intercooler piping, XS Engineering 2x11x3-in. intercooler core, custom end tanks, GReddy Type R BOV, ported and ceramic-coated intake manifold, Magnecore 8.5mm spark plug wires, Burns Stainless hard coolant pipes, Mazdaspeed engine and diff mountsEngine Management Modifications: Haltech E6K stand-alone engine management, A'PEXi AVC-R boost controller, MSD DIS-2 ignition, Bosch ignitors, Walbro 255 l/hr fuel pump, Precision 680cc injectors, Vishnu dual-feed fuel rail, B&M fuel pressure gauge, MSD 2-step rev-limiter/anti-lag
DrivetrainLayout: Longitudinal front engine, rear-wheel driveDrivetrain Modifications: Custom transmission brace, KAAZ 1.5-way limited-slip differential, ACT Xtreme pressure plate, street-strip disc
Suspension Front: Koni Yellow rebound-adjustable dampers, Ground Control 350-lb/in. coil-overs, Racing Beat hollow 1 1/8-in. anti-roll bar, Mazdaspeed strut tower braceRear: Koni Yellow rebound-adjustable dampers, Ground Control 275-lb/in. coil-overs, Racing Beat 5/8-inch anti-roll bar, Racing Beat anti-roll bar brace, radius arm bars
ExteriorWheels: 15x8-in. Kosei KI w/35mm offsetTires: 225/50-15 Toyo RA-1sBody: Miata R-package front lip, lower skirt and spoiler, Kenny Tran-sourced Porsche "turbo" emblem, "Let the Ass Kicking Begin" license plate frame
InteriorHard Dog Hard Core roll bar, GReddy 52mm boost, EGT, oil and coolant temperature gauges, Alpine CD player, Sony Mobile ES components