At Power Throttles Ltd
911 & Porsche World|December 2017

What will throttle bodies give your Porsche? Well, if it’s an air-cooled 911, 964 or 993, then about an extra 25bhp of pure bolt on power, more when combined with other mods. We get the lowdown from AT Power Throttles and its ingenious ‘shaftless throttle’ design.

Brett Fraser

They’re a modest bunch over at AT Power Throttles in Wymondham, Norfolk. Not prone to blowing their own trumpets, despite manufacturing quite a few of them. But the team at AT does have some good tales to tell: you just have to work long and hard to prise them free.

One such tale relates back to when the current owners bought the company from the administrators five years ago. There had been ‘issues’ concerning some of the products sold by AT in its previous guise, but rather than just drawing a discreet veil over problems that weren’t in any way their responsibility, the new AT team contacted all disgruntled customers. Offered to fix and improve the affected components. For free. ‘It cost us a six-figure sum,’ admits AT’s Business Development Manager, Paul Knapp, ‘but it meant that we could get on with turning around the company without a background of ill-feeling. We could ring customers up and they would be happy to hear from us, because they knew we were handling their issues.’

As a consequence of the team’s reticence to self-promote, many of us will never have heard of AT Power. ‘In the simplest possible terms,’ explains Ben Clifton, technical sales manager, ‘what we do is to make people’s cars go faster.’ More specifically, though, the firm designs, tests and manufactures throttle bodies and other throttle assemblies and all their ancillary components, oil pumps and dry sumps, primarily for motorsport applications but also for the performance tuning market. And while AT Power is UK-based, it sells its products to a global audience.

The piece of technology of which AT is proudest – and has won awards for – is its ‘shaftless throttle’ inside its throttle bodies, claimed to achieve an extra 25bhp when used on air-cooled 911, 964 and 993 flat-six motors. Throttle body setups use a butterfly valve inside the trumpet to vary the amount of air entering the cylinders; typically, this butterfly is mounted on a shaft or spindle, and is held in place by a couple of screws. When the butterfly is fully open, at full throttle, the shaft and screws protrude from the surface of the butterfly, obstructing and disrupting the flow of air past it.

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