For enthusiasts looking to enhance the performance of their classic MGB, forced induction is a popular route. Often, the conversation revolves around superchargers, but a question arises: why aren’t there readily available turbo kits for the MGB engine? Let’s dive into the Turbo Vs Supercharger debate specifically for MGBs, and explore why a turbocharger might actually be the superior choice, despite the current market favoring supercharger kits.
When considering forced induction, it’s crucial to understand the fundamental differences between a supercharger and a turbocharger. Superchargers are mechanically driven by the engine’s crankshaft, meaning their boost output is directly proportional to engine speed. Imagine a straight line on a graph – as RPMs climb, boost pressure increases linearly. This provides predictable power delivery, but it also means the supercharger is always drawing power from the engine, even when boost isn’t fully needed. This constant draw results in some parasitic loss and can impact fuel efficiency, especially at lower engine speeds and part throttle.
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Turbochargers, on the other hand, operate using exhaust gases that would otherwise be wasted. This key difference leads to a dramatically different boost curve. Instead of a linear increase, turbo boost builds as exhaust flow increases, resulting in a curve that mirrors a typical engine power curve. Typically, a turbocharger will “spool up” quickly, reaching full boost pressure by around 2000 RPM. This translates to a significant torque increase in the mid-range, often exceeding what a supercharger can deliver at similar engine speeds. Furthermore, turbochargers are equipped with wastegates, which regulate maximum boost pressure and, crucially, can bypass the turbo unit when the throttle is closed. This bypass feature significantly reduces parasitic losses and contributes to better fuel economy compared to superchargers, particularly during off-boost driving conditions.
So, if turbos offer potentially better torque, improved fuel efficiency, and a more dynamically shaped power curve, why aren’t there readily available bolt-on turbo kits for the MGB? The answer isn’t due to technical difficulty. Turbocharging an MGB engine isn’t inherently more complex than supercharging it. In fact, having all the engine ports on one side of the MGB engine block can simplify the plumbing for a turbo system. While turbo installations require careful heat management and shielding, they eliminate the need for a direct crankshaft connection, which can be a complex aspect of supercharger setups.
The primary reason for the lack of MGB turbo kits is simply market development. Historically, most turbo installations on MGBs have been custom, one-off projects, never reaching mass production. What’s needed is someone to replicate the success of companies like Moss Motors in the supercharger market, by developing a well-engineered, straightforward turbo kit that bolts onto a stock MGB engine. Such a kit, utilizing a new exhaust manifold, downpipe, and likely a carburetion setup that allows for “suck-through” configuration with a suitable SU carburetor, could deliver even more impressive results than existing supercharger kits.
The market demand is likely there. If a turbo kit could be produced at a similar price point to current supercharger kits, it could be a compelling option for MGB owners seeking a significant performance upgrade. Just consider the performance world – even high-performance cars like Lamborghinis are being turbocharged to achieve incredible power gains, as seen with examples of 500 BHP Gallardos being boosted to 1000 BHP with turbocharging. It’s time someone brought that turbocharging potential to the classic MGB.
