TurboSource Sets ND Miata Horsepower Record with PSB-1

With help from Innovate’s PSB-1 PowerSafe Boost gauge, TurboSource sets the ND Miata horsepower record. Check out the install inside.

There’s a saying in the performance enthusiast community, particularly for those that frequent track days and autocrosses, that “the answer is always Miata.” Which is to say that in almost any type of performance driving, Mazda’s two-seater is an excellent choice, if not the ideal one outright.

ND Miata cabin
The cabin of the ND Miata is a great place to do the business of driving. The Innovate PSB-1 seems right at home here, and looks OEM-like with its installation in the housing for the center air vent.

Debuting late in 2015, the fourth generation MX-5 is arguably the best iteration of Mazda’s two-seater yet, shedding some 150 pounds versus its predecessor. That means the MX-5 Club model comes in at under 2300 pounds, or roughly 500 pounds less than a Subaru BRZ, itself considered a lightweight among modern sports cars.

Innovate’s PowerSafe gauges
Innovate’s PowerSafe gauges combine patented O2 sensor control technology with application-specific sensors as well as a smart safety override circuit which can disable your factory or aftermarket boost control solenoid, forcing the system to spring pressure.

That makes the ND Miata a great starting point to build from, particularly in the aforementioned Club trim, which includes a limited slip differential, Brembo front brakes, Bilstein dampers, additional suspension bracing, and BBS wheels.

But one performance aspect the Club model doesn’t upgrade is the power, as its still motivated by the same naturally aspirated 2.0-liter four cylinder motor as the rest of the MX-5 lineup, which makes 155 horsepower and 148 pound-feet of torque.

Without much mass to move around it’s enough grunt to make the MX-5 entertaining to drive, but there’s certainly room for improvement, which is where companies like TurboSource come in.

BorgWarner EFR 6758 turbocharger PSB-1’s MAP sensor

(Left) The BorgWarner EFR 6758 turbocharger and its requisite plumbing tuck in nicely under the hood while providing enough clearance for the Club model’s strut brace. (Right) The PSB-1’s MAP sensor must be installed with the hose fitting facing down, and it’s important to keep the sensor away from direct heat sources, as well as ignition and/or other potential RF emitting sources. That makes this spot on the driver’s side of the engine cover a good choice.

“We’re a sister company of a much longer-standing brand that primarily does rotary engine performance here (Turblown Engineering),” says TurboSource’s Elliot White. “We have a wide range of customers, from all out race cars, to street cars, and weekend warriors. We mostly cater to EFI cars with turbochargers, and bought our 2016 Miata to start developing a turbo kit for the car. The ND Miata looks good, handles well, is RWD and is very light weight. All it really needs is more power.”

TurboSource’s Miata now makes 235 rear-wheel horsepower and sends 238 pound-feet of torque to the ground on pump gas with the addition of their in-house designed BorgWarner EFR 6758 Vband IWG turbocharger kit (running at 10 psi in this configuration), along with a three-inch stainless steel catback exhaust of their own design and ECUTEK racerom software tuned by Matt at OrangeVirus Tuning.

MTX software
Using E85 Flex Fuel and 13 psi of boost, the MX-5’s turbocharged 2.0-liter mill makes over 259 horsepower and 291 pound-feet of torque at the wheels, gains of 115 hp and 155 lb-ft. You’d better believe that’s a noticeable improvement.

That’s a substantial bump from the stock output of 144 hp and 136 lb-ft on the dyno, and as much as 259 horsepower and 291 pound-feet at the wheels can be had using E85 Flex Fuel and 13 psi of boost. And that’s with the use of the stock drivetrain and fuel system.

TurboSource also selected Innovate’s PSB-1 PowerSafe Boost & Air/Fuel Ratio Gaugefor the kit. “We have been using Innovate products for over 16 years with a lot of success, and wanted a two-in-one gauge,” says White. “We picked the PSB-1 over the SCG-1 because we have a Turbosmart IWG actuator on the car, and just planned on using one spring (high boost). High power is addictive, and we see no reason to ever run low boost on anything.”

As for the future, White says TurboSource has some big plans in store for Mazda’s diminutive sports car. “We intend to build the engine, upgrade the transmission, and run 30+psi,” he says. “The car really needs a set of cams and some head work at the moment – it does not flow very well up top,” White added.

“The target goal is 500 rear-wheel horsepower. At only 2300 pounds, this should make the car pretty quick.”

 PowerSafe gauge
The PowerSafe gauge features a sharp-looking OLED display and serves as an all-in-one solution, offering a shift light, a boost gauge, and an air/fuel ratio readout among other features.

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