Introducing the Moss MGB Turbo Kit
Experience a massive leap in performance without sacrificing OEM-like drivability. The Moss MGB Turbo Kit is a comprehensively engineered, bolt-on forced induction solution designed to spool up quickly with minimal lag, providing exceptional low-end torque and power throughout the RPM band. Depending on your selected upgrades, you can expect a 57% to 76% increase in maximum horsepower and a 40% to 95% increase in maximum torque over a stock naturally aspirated engine.
Blow-Thru Carburetor Technology
Our kit utilizes a specially prepared HIF “blow-thru” carburetor setup, which improves throttle response and allows for easier cold starts vs past draw-through setups. The fuel bowl is pressurized through a boost reference signal ported directly through the inlet elbow. The rising-rate fuel pressure regulator increases fuel pressure at a 1:1 ratio with boost, maintaining proper pressure differentials and preventing flooding.
Simplified Reliability
Based on thousands of miles of real-world testing, our system operates safely without the complexity of blow-off or diverter valves. At our recommended boost levels, we noted zero signs of compressor flutter or damage, offering you a cleaner, more reliable engine bay.
Cooling & Safety
The K03 turbo uses engine coolant to maintain optimal temperatures. We highly recommend flushing the engine block and upgrading to a new aluminum radiator to handle the extra thermal load.
Want to learn more? We made this handy video to walk you through the turbo kit and how it works. Our own Geoff describes the kit components, as well as upgrades that will be available soon.
What's Included in the Base Kit
We’ve engineered a comprehensive package requiring only basic permanent modifications (like tapping the oil pan). The base kit features:
- Modified K03-Style Turbocharger: Based on the original Borg-Warner design, but specially modified for use with the MGB.
- Built-in Wastegate: Pre-set to a reliable 6 PSI of boost.
- Fuel Delivery Upgrade: A Walbro High-Capacity Electric Fuel Pump combined with a Malpassi "Rising Rate" Turbo Fuel Pressure Regulator ensures reliable fuel flow under boost.
- Specialized Carburetion: Specially-prepared SU HIF 44 Turbo "Blow-Thru" Carburetor with a Turbo Tune.
- Custom Manifolds: Bespoke Cast Iron Exhaust Manifold and an Aluminum Intake Manifold with Carburetor Inlet Elbow.
- Premium Plumbing: Silicone intake/charge hoses, a high-capacity cone air filter, and all necessary hardware, fittings, and oil lines for seamless installation.
- 2.5" Downpipe: Bolts directly to Moss exhaust systems or can be custom-welded to your existing setup.
Dyno Testing Results
| Test Vehicle / Setup | Max. HP | HP Increase | Max. Torque | Torque Increase | Key |
|---|---|---|---|---|---|
| 1972 MGB - Stock, Naturally Aspirated | 66.0 | – | 92.1 | – | █ |
| 1967 MGB Turbo - Base Kit | 103.7 | 57% | 128.8 | 40% | █ |
| 1967 MGB Turbo - Cold Air Intake | 106.7 | 62% | 135.5 | 47% | █ |
| 1967 MGB Turbo - Intercooler @ 6 PSI | 105.5 | 60% | 154.5 | 68% | █ |
| 1967 MGB Turbo - Intercooler @ 8 PSI | 116.2 | 76% | 179.9 | 95% | █ |
| Test Vehicle / Setup | Max. HP | HP Increase | Max. Torque | Torque Increase |
| 1972 MGB - Stock, Fuel Injected | 66.0 | – | 92.1 | – |
| 1967 MGB Turbo - Base Kit | 103.7 | 57% | 128.8 | 40% |
| 1967 MGB Turbo - Cold Air Intake | 106.7 | 62% | 135.5 | 47% |
| 1967 MGB Turbo - Intercooler @ 6 PSI | 105.5 | 60% | 154.5 | 68% |
| 1967 MGB Turbo - Intercooler @ 8 PSI | 116.2 | 76% | 179.9 | 95% |
NOTE: Actual dyno results may vary depending on engine health, environmental conditions, and specific vehicle setup. These power and torque numbers are measured at the wheels.
Check out our video below from the dyno test sessions!
Stock 1972 MGB GT vs. 1967 MGB w/ Base Turbo Kit
1979 MGB w/ Base Turbo Kit vs. 1973 MGB w/ Built & Supercharged Engine
Upgrades Compared: Base Turbo Kit, Cold Air Intake, and Intercooler Kit @ 6 PSI.
Upgrades & Supporting Components
Stage 1: Cold Air Intake Kit (1962-76)
150-255
Yields 5-20°F cooler intake air temps . More power and increased resistance to detonation . Requires cutting radiator support.
Stage 2: Intercooler & Boost Controller Kit (1962-76)
150-260
Drops intake temps up to 45°F and safely enables increasing boost up to a recommended 8 PSI. Requires Cold Air Intake Kit.
Moss MGB Turbo Bolt-on Exhaust
150-265
The absolute easiest exhaust solution. Bolts directly to the turbo downpipe. Highly recommended as stock exhausts restrict airflow.
Performance Aluminum Oil Pan w/ Pre-tapped Oil Line Fitting
150-267
Pre-fitted with a tapped oil return line fitting for quick and easy installation.
Boost Gauge / AEM Wideband AFR Gauge
010-515 / 907-270
Essential for monitoring boost and preventing lean conditions that can lead to engine failure .
Boost Retard & Digital Programmable Distributors
150-266, 009-791
Backs off ignition timing under boost for max performance and safe operation without sacrificing light-throttle economy .
Aluminum Radiators
456-881 (1962-67), 459-666 (1968-76), 459-676 (1977-80)
Direct-fit upgrades designed to handle the turbo's extra thermal load. Improves cooling capacity and reliability, preventing overheating under heavy boost.
Important Technical Advisories
Boost Limits: The base kit wastegate is set to ~6 PSI. While we have tested up to 11 PSI with an intercooler, we strictly advise customers not to exceed 8 PSI to prevent engine knock or catastrophic failure. Going beyond 8 PSI exceeds the flow capacity of the included HIF 44 carburetor.
Exhaust Fitment: If you already have the Moss Tourist Trophy Exhaust (459-075), you'll only need the short downpipe section (459-081) to bolt up . If you have the header kit (459-085), you can discard the header and bolt the rest of the system directly to the Turbo downpipe.
Stage 1/2 Upgrades: Note that the Cold Air Intake and Intercooler kits do not fit 1977-up MGBs with forward-mounted radiators.
What Should We Turbo Next?
Take this quick survey if you're interested in a turbo kit for another Classic British application. We might just build it!