Report 412 BHP...THAT WILL DO NICELY...... in Esprit Chat Posted May 1, 2011 In truth - we dynod about 5-6 Esprits a few years back at Merlin motorsport in Milton keynes and they all came out spot on. Infact the ONLY cars to actually achieve their HP were the Lotus's and the Porsche....same HP and 23 years old 117000 miles....amazing. We had 2-3 standard cars, inc a V8 that came in at.............350hp corrected Mine was spot on as expected @ 252 hp with air filter / exhaust / catch tank mods (it did ponse the overboost up though, looking at the graph trend it was building power again and would have it ~260) So its fair to say I have about 212 whp Alans std S4s was 286hp (lol @ the TVRs, Ferrari and the Noble which were WAY under) So it is possible, using rundown to estimate flywheel horsepowers. Thing is a lot of people turn up the boost and eff around with the car and dont really consider their cars COULD produce a lot more HP if they didnt neglect the rapid increase in temperature the turbo is producing. You've only got to have a blocked chargecooler rad or have it misbehaving and you're gonna lose huge HP levels once the turbo start running past its effeciency zone and throwing out red-hot air. Plus you wont see these figures on the road becuase of the soak heat in the chargecooler which robs you of significant power - chipped cars only make the problems worse....as I say good for a short burst but you still get massive losses on prolonged runs and fast driving. FYI my drag factor was ~46.5 HP - 1 whole 5th of my output ! Lucas - this also rings true considering about 1-2% error with your figures. Your std car is 221 whp and has 200cc more than mine so I'd say that was more than fair.