We have just retired for last season 2013 when we had a 2012 EVRR, so the chassis was only a few months old, we went OK; got second fastest lap of the year, but we seemed to struggle with consistent results. The year before 2012 we were running on an 09 EVR (Exprit) which we ran in 2011, we did about 20 race meetings in 2011 and 2012 - 40 in total and the kart had done at least 20 meeting before we bought it - so at least 60 meetings. We built a jig and tweaked the chassis between each meeting but it only moved a bit after racing. In 2012 after the chassis had done about 50 meetings, we broke the lap record at two circuits, one which had stood for 6 six years, we won many races and meetings inc. the NKF round with 20 on the grid. We eventually won the 2012 club championship, all with the oldest chassis on the grid! People inc. teams questioned why we went so well on a old chassis - we didn't really know apart from proper preparation and set up (I was always the last to pack up on a Sat evening following testing and before race day - some of it must have helped!!)and testing and my lad must have had some driving talent!! When we went on the newer chassis my lad said it was easier to keep the speed up on the faster bends but that was all the difference. So don't bank on going faster with a newer chassis. See if you do a test on a newer chassis at the track you normally race at, make sure you use the same tyres to back to back with your older chassis. We tried a 2013 chassis at the end of the year and didn't go any faster than the 2012, that contributed to our decision to retire. Finally do not invest too much in the newer chassis and keep the old one if you can afford to - you might find the two chassis will work better in wet or dry.
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