Kjetil wrote on Jan 21^st, 2011 at 11:30am:

Hi. I have some numbers to work with now. But I couldnt count them all in because it was too mutch (all engine variations, winglet efficiency, hushkits, newexaust nozzles and more). So I took the very basic. The numbers I did include was the total thrust on the standard 727 engines JT8D-7(3x14000lb) and total thrust on the super 27 JT8D-217C(1x14000lb + 2x22000lb). The number 2 engine is the same, but 1 and 3 is more powerfull and burn the fuel more clean and efficient. So, total thrust increase is 38%, and fuel decrease is around 20%. So the thrust scalar should be from 1,0 standard to 1,38 S27. And down the fuel flow scalar, from 1,0 standard to 0.8 S27. It seems to work fine in my FSX. The climb capability was alot better. I have only done this with the 100 series (SITM). 200 series is to be tweaked soon. The numbers I have not included is the total payload increase. The 100 series it was up to 6000lb (MTOW from 170.000lb to 176.000lb) and the 200 series it was up to 10.000lb (MTOW from 210.000lb to 220.000lb). I'm not sure how to work this out, so if any of you have any ideas it's very welcome. Also if anyone disagree in the numbers I presented here please let me know. Thanks Kjetil  :)

Hi, what you need is the net thrust and fuel consumption in relation to its weight. The Super is a complete different plane, (longer, heavier, center of gravity, etc) I believe its not just 38% more powerful and consuming 20% less fuel. Per your figures the payload increased up to 68% and the MTOW nearly 30%, I guess these combined changes in power and eight were made to counter the increase...leaving the Super with the same ratio as the 100 series, or at best a maximum of 10% more power and efficiency, not more than that.
K