British tuning firm BBR has been fitting turbo upgrade kits to Mazda MX-5s for years — since the original model was launched here in 1990, in fact. It’s now launched a kit for the latest 2015-on Mk4 MX-5 2.0-liter… and even this introductory "Stage 1" upgrade delivers 248 horsepower (185 kilowatts) and 236 lb-ft (320 Nm) of torque.
This gives the BBR MX-5 Turbo a top speed of 155 mph (250 kph), and a 0-60 mph (0-96 kph) time of 5.0 seconds. All for just under £6,000 fully-fitted — and if you’re worried about doing such extreme things to your shiny MX-5, panic not: BBR promises factory levels of finish, full MOT emissions compliance and no nasty new engine mannerisms. It’s even fully reversible, should you wish to take the car back to standard, and BBR has applied for both CARB and TÜV official approval.
Peak power from the boosted Skyactiv-G engine is delivered at 7,150 rpm and peak torque comes in at 3,250 rpm: more than 200 lb-ft (271 Nm) is available in a range spanning 2,750-6,500 rpm. That potent 0-60 mph time represents a reduction of more than two seconds in the benchmark dash — and it’s so fast, the 155-mph top speed is an electronically limited one…
The kit, which is also available in the U.S. though distributor Flyin’ Miata, has been three years in development. It uses a twin-scroll turbo rather than a supercharger: BBR’s Neil Mckay said it was quickly clear that “a supercharger, with its high parasitic losses, would work against the Mazda Skyactiv-G engine’s ultra-efficient ethos. Significant boost levels would be required to deliver considerable power gains with a supercharger, which would be incompatible with the engine’s high compression ratio."
Mazda’s intricate 4-2-1 exhaust manifold meant single-scroll turbos were not an option either, leading BBR to the twin-scroll unit: “Our extensive dyno and road testing has proven that our choice of a low back pressure twin-scroll turbocharger, with its enhanced exhaust scavenging ability, is the optimal solution. It works harmoniously with the original Skyactiv-G layout and knock-resistant technologies, as is evident by the impressive power figures achieved at very modest boost pressures.”
Like the sound of the Stage 1 kit but also like getting your hands dirty? Help is at hand; BBR also offers an MX-5 Turbo DIY kit, including all necessary hardware and software, for £5,275. Both kits are offered with warranty packages of up to three years.
Gallery: 2017 BBR Mazda MX-5 Turbo
BBR LAUNCHES STUNNING MAZDA MX-5 / MIATA ND STAGE 1 TURBO UPGRADE – 248 BHP AND 236 LB.FT OF TORQUE AVAILABLE
- All-new high performance turbocharger upgrade for MY 2015 onwards 2.0-litre Mazda MX-5 ND models (including the latest RF)
- Post conversion, engine produces 248 bhp and 236 lb.ft of torque equating to 234 bhp per ton
- Slashes 0-60mph time to just 5.0 seconds, top speed limited to 155 mph
- Incorporates the latest exclusive twin-scroll turbocharger technology and bespoke BBR cast-iron manifold to maximise response
- OEM Mazda electronic safety features are retained, as well as MOT emissions compliance and standard idle characteristics
- Factory levels of finish, non-engine intrusive and fully reversible
- CARB and TÜV approval under development
- On sale now, with prices starting from £4395.00 excluding VAT
- Available to US customers via exclusive US distributor Flyin’ Miata
Brackley, Northamptonshire, 21st April 2017
Renowned Mazda tuning specialist BBR is proud to announce the launch of its latest development, an all-new ‘Stage 1’ turbocharger upgrade package for the 2.0-litre Mazda MX-5 / Miata ND MY 2015 onwards models that increases power to a stunning 248 bhp at 7150 rpm, allied to an impressive 236 lb.ft of torque at just 3250 rpm.
Cleverly designed to install without intrusive mechanical alterations onto the 1998cc SKYACTIV-G engine, the BBR Stage 1 turbocharger upgrade is specified to enhance driveability as well as outright power. Post conversion over 200 lb.ft of torque is available between 2750 rpm and 6500 rpm, highlighting the upgrade’s user-friendly nature, irrespective of road or track conditions.
Initial performance testing with the turbocharger upgrade indicates a 0-60 mph time slashed from 7.3 seconds to a scorching 5.0, enabling the BBR Stage 1 equipped Mazda MX-5 to humble much more expensive machinery, a consequence of its impressive 233 bhp per ton power to weight ratio. Top speed is electronically limited to 155 mph.
BBR has extensive experience of turbocharging MX-5 engines since the late 1980’s and this latest development completes its portfolio of turbo upgrades for four generations of Mazda’s iconic sportscar. However, the marque specialist called upon all of its in-house engineering expertise to develop a forced induction package for the SKYACTIV-G engine, a process that began back in 2014, with early development conducted on a Mazda 3 test vehicle.
The end results of nearly three year’s work is an extensively developed ‘Stage 1’ turbocharger upgrade that is straightforward to install, retains a factory style underbonnet appearance and is fully reversible, yet delivers on BBR’s objectives of producing stunning performance, driveability and reliability, combined with emissions compliance for key sales regions.
One of the key elements of the Stage 1 turbo upgrade is the adoption of a twin-scroll turbocharger, an innovation that was selected after all other options were considered and rejected. BBR’s Neil Mckay explains - ‘Very early on during development it became clear that use of a supercharger, with its high parasitic losses, would work against the Mazda SKYACTIV-G engine’s ultra-efficient ethos. Significant boost levels would be required to deliver considerable power gains with a supercharger, which would be incompatible with the SKYACTIV-G engine’s high compression ratio,’ he continues.
An additional complication, which greatly influenced BBR’s turbocharger selection criteria, is that this latest 1998cc Mazda powerplant features a specifically developed 4-2-1 manifold designed to exploit exhaust scavenging technology. Mazda adopted this technology for the SKYACTIV-G engine to overcome the marginal exhaust restriction of a catalyst close to the cylinder head.
As a consequence, single scroll turbochargers were assessed by BBR but dismissed because their design creates excessive back pressure and inherently lacks any form of exhaust scavenging potential. ‘Therefore, having rejected all other forced induction methods, our extensive dyno and road testing has proven that our choice of a low back pressure twin-scroll turbocharger, with its enhanced exhaust scavenging ability, is the optimal solution. It works harmoniously with the original SKYACTIV-G layout and knock-resistant technologies, as is evident by the impressive power figures achieved at very modest boost pressures,’ Mckay comments.
The twin-scroll unit that BBR has elected to utilise features a bespoke latest generation billet compressor wheel and lightweight, low inertia turbine in a compact internally wastegated assembly. The resulting turbocharger is a highly efficient and responsive forced induction solution, yet retains a large boost upgrade margin for later power stages.
BBR Stage One package technical details:
In detail, this exclusive TSX30-71R twin-scroll turbocharger mounts onto a bespoke BBR designed cast-iron twin-scroll manifold, whilst air charge temperatures are controlled by a front-mounted air to air intercooler, which is easily installed without bodywork alterations.
Similarly, the boost hoses and replacement battery tray are all finished in a factory style black and a high-flow K&N induction system is discretely positioned as befits BBR’s target client base of brand new and nearly new Mazda MX-5 ND owners.
Electronically the Stage 1 turbo upgrade equipped car benefits from BBR’s renowned Starchip / EcuTek RaceRom ECU software package, which includes revised fuel, ignition and boost calibration designed to optimise driveability and performance across the rev range, whilst retaining all Mazda’s OEM fail safes. ‘On the Stage 1 conversion boost is set a conservative 7 psi, which is well within the limits of both the BBR turbocharger and the SKYACTIV-G engine,’ says BBR’s Neil Mckay. ‘With internal upgrades to the Mazda engine we know that considerable more power is available – the BBR technical team is already developing future stages to exploit this.’
BBR Stage One package pricing details:
Available now, the Mazda MX-5 ND Stage 1 turbo package is priced at £4995.00 including ‘drive in, drive out’ installation at BBR’s Brackley premises by its qualified technicians and dyno power graph (A DIY version, including all hardware and software is also available priced at £4395.00).
For complete peace of mind BBR offers 12 to 36 month extendable warranty packages for Stage 1 customers.
Key components of the BBR Stage 1 Mazda MX-5 ND Turbo upgrade include:-
- BBR bespoke twin scroll hybrid TSX30-71R turbocharger including jet turbine specification fixings
- BBR bespoke cast iron twin scroll exhaust manifold
- BBR stainless steel downpipe
- BBR high-flow lightweight front mounted aluminium intercooler with factory look black intake pipes
- BBR high-flow custom silicone turbo pipes in factory look black finish with stainless steel hose clamps and unique black coating
- BBR lightweight aluminium battery tray in factory black finish
- BBR recirculating piston type dump valve in factory black finish
- BBR / Bosch MAP / temperature sensor
- BBR high efficiency carbon fibre turbocharger heat shield
- BBR high flow K&N Typhoon induction kit
- BBR stainless steel oil and water lines
- BBR Starchip EcuTek RaceRom calibration software
NOTE: All quoted prices exclude VAT.