Radical launches 'radical' new SR8

Known for its extreme track day cars, Radical has pushed the boundaries even further with the new SR8, powered by the all-new RPA 2.6 litre V8 motor manufactured in-house by Radical’s engine company Powertec Engineering. The new car ran on the dyno for the first time last week and turned in an impressive performance. The RPA – Radical Powertec Series A -- generated 325 bhp at 9,000 rpm, with 190 ft/lb of torque at 7,000 rpm. Powertec boss Ted Hurrell said he was very confident that his target of 350 bhp at 10,000 rpm will be easily surpassed.

The SR8, which weighs under 600Kg, is based on the hugely successful SR3 Turbo spaceframe chassis and suspension, but with an all new aerodynamic package.

A new integral front undertray venturi, crashbox and side vents give increased downforce at the front of the car, while a revised airbox layout at the rear gives improved air flow to the new, high downforce bi-plane rear wing.

A new six-speed sequential transaxle has been jointly developed by Powertec Engineering and Quaife. The transverse gearbox incorporates a reverse gear and the Quaife, torque-biased limited-slip differential.

Many of the car’s new features such as 280mm floating discs, 8.5-inch wide front and 10.5-inch wide rear BBS wheels fitted with specially developed Dunlop tyres, have been proven on the SR3 Turbo.

Radical is also announcing a six round, 12 race series for SR8 cars, to be called the Powertec Cup. Each round will comprise two 50-minute races for two driver teams. Four rounds will be held overseas, provisionally at Spa, Nürburgring, Dijon and Anderstorp, with two in the UK at Silverstone GP and the Radical Cadwell Park festival.

History

In 1997 the 1100cc Clubsport was launched, two years later the 1300cc Prosport, then the 1500cc SR3 and the SR3 Turbo, and finally this year the SR4.

Contact Radical here for more.

Download an MP3 of the engine starting here.

Comments (26) Join the discussion on the forum

  • Cotty 05 Oct 2004

    325 bhp at 9,000 rpm in under 600kg

    That looks like fun, anyone care to work out the power to weight ratio

    This is the sort of car you feel guilty about having a bacon sarni before you drive it.

  • dannylt 05 Oct 2004

    Err, 325/0.6 = 540 bhp/ton. But include driver of 75kg, and with the final estimate of 350bhp minimum, that's just under 520. I guess (obviously) the main difference over the SR3 is more top end acceleration and more midrange torque. I want one, but it would be even more ridiculous for track days I wonder if they'll get it to pass SVA?

    You can hear some sound samples on the Radical website too. I saw the engine half way through one of it's dry builds in the workshop - looks very neat & compact.

  • jedi 05 Oct 2004

    Will be interesting to see how much the added weight of the new engine at the back affects the lap times. On the smaller circuits there wont be much diff between a well sorted SR3 and the SR8. Cadwell for example I reckon an SR3 would be quicker, especially round the twisty bits and neg cambers.

    Silverstone Inter or GP though would be an excellent place to prove the straight line speed of the new car.....

    either way, the new engine looks great.


  • nildram 05 Oct 2004

    Spot the odd one out in the list of circuits for the race series!

  • Beast 05 Oct 2004

    dannylt said:
    Err, 325/0.6 = 540 bhp/ton. But include driver of 75kg, and with the final estimate of 350bhp minimum, that's just under 520. I guess (obviously) the main difference over the SR3 is more top end acceleration and more midrange torque. I want one, but it would be even more ridiculous for track days I wonder if they'll get it to pass SVA?


    Clearly you need a handily located (& lardy) passenger to keep you on the straight and narrow Danny.

View all comments in the forums Make a comment