This document explains the engine various modifications, with a common path through them. However, these various modifications can be done in many different orders, and this is merely a guide.
Engine breathing
The s14 200sx seems to have been designed and marketed not as an out-and-out sports car, but as a sporty car with suitability for the company-car market. With this in mind, the air intake and the exhaust are quite restrictive, making the car more refined. Removing these restrictions will unleash a good few horsepower just by allowing the engine to do its job unfettered, and as such, may even increase the fuel (more…)

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The ‘I4′ DOHC engine first introduced in the Ford Sierra and Granada models of late 1989 was only available in the Sierra in 2.0-litre 8-valve form. While power output improvements can be made to the stock 2.0 8v engine, as documented in a separate article entitled ‘DOHC tuning’ and available from http://www.crustworld.co.uk/sierra/dohctuning.pdf, the engine output is ultimately limited by the availability and cost-effectiveness of off-the-shelf tuning parts.
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