News Open Class: S2 Performance/ Hankook RX7


All images by Sam Philp

One of the most hotly anticipated cars in the Hankook Competition Open Class for 2011 is the RX7 from Adelaide based Chiropractor Brad Trenwith. This car has been in a constant state of development since 2008 but it is in recent times that is has been making a very big noise in the local South Australian time attack rounds.

Like most guys in the WTAC, Brad started out with a street car that he was doing a bit of track work in, but as so often happens things got a little out of control and in 2008 the decision was made to build the foundation for what you see before you now. It started with a cage and the running gear out of the street car but you can rest assured it is a whole lot further down the road than that now.

You see not long after this Brad moved to Adelaide to establish his Chiropractic practice and the RX7 went with him and it was not that long after arriving that he met with Jason from REVS and a very healthy Bridgeport turbo engine found its way into the engine bay. Now horsepower was no longer a problem but sadly one day Brad discovered that the new found power either exceeded the limits of the chassis or his ability at the time and he had a slight incident with a wall at Wakefield Park raceway

With the time attack bug well and truly biting hard now Brad set about turning a negative into a positive and as the car needed repairing anyway ordered a widebody kit from Bodyform and 18 X 10 inch Enkei rims to stick underneath and a matte black vinyl wrap by D&S auto. At this time the car was mostly campaigned on full slicks (yuck!) as this is what the rules of the South Australian series allowed.  It was also around this time that Brad had a chance meeting with SA based suspension guru Brandon from S2 performance who immediately took a shine to the direction that Brad was heading and became involved giving this team some new found direction and bringing a wealth of experience along.

This resulted in a Brad having a total rethink of the suspension, aero and various other aspects of the RX7 and the direction it was heading. To the teams credit the car won the 2009 SA time attack championship but there was still loads more in it and . The suspension got the heave ho and in went a set of big dollar Ohlins coil over’s which transformed the handling but as is often the case the further down the track you go the more that everything needs to work in harmony and now reliability issues started to raise their head, namely the turbo, clutch and the transmission.

Wayne Flaherty from MTQ/ Sonic Performance has now stepped in to help with a trick Garrett GT37 turbo charger eliminating any turbo problems and then there was the issue of breaking gearboxes. None of these problems are unique to Brads car and the transmission issue seems to have been resolved by Albins’ who have made Brad a straight cut dog engagement set that so far is proving to not only provide the reliability needed but has also dropped the lap times through faster gear changing and the clutch is now an Xtreme Carbon triple plate. The car is wrapped in matte black vinyl by D&S auto.

With the local time attack series making the switch from slick tyres to semi slicks the car has gone from strength to strength. Certainly 2011 has been the year that this team has made the big advances and one of the biggest was talking to Mark Povey at SA motorsport tyres and the decision was made to switch to the Hankook Ventus TD Z221 tyres. This saw the times tumble and set a PB of 1.12 at Mallala was good enough for second place behind the lightning quick Evo of Steve Knight and also enough for the guys at Hankook competition to stand up and take notice and the car is now supported by Hankook Competition and is a shining example of where the sport of time attack is heading in Australia. The team went one better at the last round walking away with a win and resetting the SA time attack record! This car is sure to be up near the pointy end of the Open Class at Eastern Creek in August.

About Hankook Tyre
Hankook Tyre is involved in the motorsports business at all levels – from supporting professional racing teams to becoming the official sponsor of racing series. Hankook has been the official tyre supplier for Formula 3 since 2003 and is the official tyre of the DTM. In 2009, the Hankook-KTR team accomplished the pole-to-one with the Porsche GT3 RSR 997 at Japan’s Super GT. In March 2010, the Hankook-sponsored racing team, Sierra Sierra, beat the new track record at the first Redline Time Attack at Buttonwillow Raceway.

The foundations of Hankook’s success in time attack are the Ventus TD (Z221) and Ventus R-S3 (Z222). It is these tyres that have propelled some of the world’s fastest time attack cars to obliterate lap records. Now, more than 18 years has passed since Hankook joined the ranks in racing. This experience has helped Hankook develop its proprietary technologies and has earned Hankook worldwide recognition. Hankook promises to continue investing into R&D in order to outperform at all levels of motorsport.

About S2 Performance
S2 Performance can provide the complete solution for your motorsport needs from the smallest installation to a complete team management package. With 15 years experience in Motorsport we have a range of services and technical expertise that can help provide the winning edge and assist you to achieve your motorsport goals.

• Competition vehicle builds
• Competition vehicle servicing, preparation & repairs
• Race engineering & custom fabrications
• Suspension damper tuning & servicing
• Vehicle set-up inc: Corner weighting & Balancing
• Competition wheel alignments
• Dedicated Rally car registration & compliancing

Unit 6, 520 Grand Junction Rd Angle Park SA 5010
Email: contact@s2performance.com.au
Phone: Sam Brand: 0439 434 591 – Brandon Scammell 0430 338 403r

hankook open class

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