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  1. Dommo

    Turbocharging the mazdafield

    I was always torn between fitting throttle bodies, a supercharger or a turbo to the Westfield. The latter are common modifications to the MX5, but the former perhaps more suited to a Westfield. So, I went down the throttle bodies route over the winter (along with an engine rebuild) and netted myself 165-170bhp, depending on which dyno you use. However, once I'd gotten an aftermarket ECU as part of the winter build, I'd gotten it into my head that this immediately makes any further changes a lot easier. I then persuaded myself that it's ok to try forced induction as I can simply put the throttle bodies on the shelf and fit a standard inlet manifold again. Whichever setup I preferred, I could sell the other. I'm not the first person to turbocharge a Mazda SDV Westfield. There's at least two others, one in the states using a Mazdaspeed manifold, and one in the continent using (I think) an aftermarket interpretation of the Mazdaspeed manifold. The problem with the Mazdaspeed manifold is it sits the turbo down low, requiring modifications to the passenger side engine mount. Whilst this is out of my skillset, finding someone to do it would be pretty easy. Unfortunately, the manifolds themselves proved impossible to track down. So I turned to someone on the MX5 forums who was well known for making custom turbo manifolds. I asked him if he could help me out and we started looking into the options. I gave him measurements of the engine bay and he suggested a top mount turbo would probably fit best. I then chose the turbo so that he could start mocking stuff up. I wanted a turbo that would spool quickly whilst also being readily available and cheap. This meant it was either a T25 from a 180sx or a TD04 from a Subaru. I went for the TD04 as it's slightly bigger than the T25 but should still be making positive pressure from 2-2.5k. As long as I'm sensible, it shouldn't run out of puff at higher revs. Within an impressively short amount of time he'd made a mockup on a spare engine he had: The downpipe curves back on itself to clear the triangulation at the rear of the engine bay. With the guy being 1,200 miles away, a test fit was impractical so I adopted 21st century bodgery and photoshopped it. Looked close, but also looked like it would fit. We put a kit together... And I went ahead and sourced a turbo. A TD04L-13T from an Impreza. Release the inner chav
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