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Back to the Y10 Turbo's strengths. Remebering that it measures only 1049cc, the belt driven ohc engine is remarkably powerful, although affected by the inherent disadvantages in throttle response wrought by a turbocharger. The IHI turbocharger runs at a maximum wastegate setting of 0.75 bar (10 psi). This relies on an air-to-air intercooler located inside the nearside front wing (and fed through slots in the front bumper), and it blows through a Weber twin-choke carburettor. The turbo itself is located right at the front of the engine, partly for cooling and partly because within the cramped confines of the under-bonnet area (room has to be found for a turbocharger, intercooler and oil cooler over above the lesser Touring model) there is probably nowhere else to put it! Fully mapped Marelli Digiplex ignition governs the whole system guarding against detonation. To cope with the output of 81 bhp/litre, the Turbo is equipped with sodium filled exhaust valves, revised piston tops and rings, and a cast-iron exhaust manifold. In comparison with the normally aspirated Touring engine (down to 55 bhp), it also uses a different camshaft and the compression ratio is reduced from 9.5 to 7.0 to 1. The gearbox retains the Touring's gear ratios but with a slightly higher final drive. The downside of forcing so much power from so small an engine is the fuel consumption - road tests of the time reported figures around 25 mpg where the Touring model could manage nearer 40 mpg. |
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