If the only difference you say is of efficiency, then where does the extra 30hp come from? Its there before and after mapping. Even with the DPF.
The chaps at Revo say its because the turbo is bigger, and the injectors do flow more fuel. There is no other explanation. More fuel and air means more power.
The extra power is mostly from a more efficent burn but they do flow more diesel as well so i was wrong in what i typed due to the fact of having more holes then the PD140 injectors. The turbo is not bigger though so if the guy at Revo told you that until i get shown proof otherwise he is wrong and i have the part numbers to prove it.
Turbo Part number OEM part number
GT1749V 724930-0008 03G 253 014H PD140
GTB1749VM 757042-0010 03G 257 019 PD170
The PD170 engine is also less fuel efficent then the earlier PD140 model.
Pferdestärken* 140
Engine cubic capacity 2000
Fuel Consumption
Urban 41.5mpg - 6.8l/100km
Extra-urban 60.1mpg - 4.7l/100km
Combined 51.4mpg - 5.5l/100km
Engine emissions 145g/km
Engine noise levels 72.0dB
Engine maximum Speed** 127mph - 203km/h
Engine acceleration 0-62mph 9.3secs
Maximum output PS 140
at RPM 4000
Maximum torque 236 lbs.ft / 320 Nm
at RPM 1750
Insurance group rating 13
Pferdestärken* 170
Engine cubic capacity 1968
Fuel Consumption
Urban 36.2mpg - 7.8l/100km
Extra-urban 58.9mpg - 4.8l/100km
Combined 47.9mpg - 5.9l/100km
Engine emissions 156g/km
Engine noise levels 73.0dB
Engine maximum Speed** 137mph - 220km/h
Engine acceleration 0-62mph 8.2secs
Maximum output PS 170
at RPM 4200
Maximum torque 258 lbs.ft / 350 Nm
at RPM 2000
Insurance group rating 16
Personally i am not that keen on the PD170 engine as you are starting to get in petrol mpg territory with couple thousand higher price tag and dearer fuel and insurance getting nearly as dear as driving a petrol then you have the dreaded DPF that tells you
how to drive the car
.