Quote:
Originally Posted by Vekke
I tested my 600mm long boattail with aba test @130 km/h speed
Here are my todays boattail test results:
on N 4.7l S 4.0l
on N 4.6l no data
off N 4.9l S4.3l
off no data S4.3l
off N 4.8l S4.2l
on N 4.7l S4.1l
on N 4.7 l S4.1l
avg on N = 4,675l avg S 4,066l
avg off N= 4,85l avg S 4,266l
diff N = 3,6% diff S= 4,7%
Total difference 4,15% less fuel in this test. My test route was not perfect due to hilly motorway, but the difference is clear. Also my cars fuel gauge shows only 0.1 liter accuracy which was also little problem. That is the reason for so high speed in the test. Also during driving the differences came in the uphill sections. Without the spoiler fuel consumtion rise much more...
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Logs of Throttle Load (different of 0 in vag com only if not using cruis control), or Torque (maybe your engine has injection mg/R instead of Torque)
Channel 6 and 15 records will help to understand if some non linear eficiency interference is hiding better aerodynamic improvements than measured.
MY car burns 6.6 L/100km at 120km/h and wheel force must equal 660N of drag. But at 184km/h burns 12L/100km but drag force is 1400N, +16% efficincy at full power full throttle 4000rpm than . But at 130 kph my car with -10% drag coefficient need -8.4% Force but -6% L/100km.