Hello, I urgently need advice. What is it about: I bought my Leon TDI FR 170PS PD in June 2008. The car was wonderful. Lief up to 235 km/h lt. Tacho without problems (on straight track) In March 2009 I noticed a power loss. The car now does not even have 215 km/h lt. Tacho on straight track. 2009, 2010 and now also 2011 I was in the total 3 times on the same test bench. The car has now 104,000 km on it. I inserted the logs. 2009 had I had 5th gear: engine power 175 hp wheel power 147.8 hp power dissipation 27.2 hp at 4221 rpm 2010 I had 5th gear: engine power 177.5 hp wheel power 146.4 hp power dissipation 31.1 hp at 4246 rpm Compared to 2009, I had more engine power but less wheel power. 2010 I had 6th gear: engine power 183.4 hp wheel power 139.8 hp power dissipation 43.6 hp at 4112 rpm 43.6 hp power dissipation???? That’s a complete small car in 2011 I had 5th gear: engine power 159 .9 hp wheel power 136.9 hp power loss 23 hp at 4061 rpm Compared to 2009, I have 11 hp less wheel power and 15 hp less engine power. Compared to 2010, I have almost 10 hp less wheel power and almost 18 hp less engine power. In 2011 I had 6th gear: engine power 164.3 hp wheel power 138.2 hp power loss 26.1 hp at 3985 rpm Compared to 2010, I have 19 hp less engine power and now it comes! One should understand. I don’t understand the world anymore. Seat means my car is fine. The wheel power drops. The corresponding speeds decrease. According to my calculations I have to come in 6th gear to 4030 rpm so that I can drive real 214km/h. I can only do this downhill. And then I also need a long mountain. In 5th gear I can’t reach 214km/h. Technically, I can’t do that. Gear ratio is as follows: 5th gear: 0,902 translation 6. Ga ng: 0,757 Final drive ratio: 2,917 Wheel size in inches 18 Wheel width in mm 225 Cross-sectional ratio 40 And the nice thing about this: at 4030 UpM in the 6th gear, 150hp must be attached to the wheel according to my calculations. Otherwise, the air resistance is too large. Lt. The latest diagram is missing me rich 13hp on the wheel at 4030 UpM. I find this is already a house number in the speed ranges. I have used the following parameters: CW value = 0,334 Sources are in the net Front area = 2,159 m2 (Self-standing) mmt) Operating weight with driver 1420kg rolling resistance coefficient 0.017 The injectors were cleaned with me at the end of 2010. Unfortunately an improvement was not possible. Does one of you have a performance diagram of the wheel power for this engine? Optimally 5th + 6th gear…. The wheel power seems to me clearly too deep I thank each of the answers…