I asked a few times and never got an answer to this question so after some tooling around I thought I would post this here in case someone else needed to know! 

--------------------FOR X, Y, Z, ADJUSTMENTS OF SMOKE AND AFTERBURNERS IN FSX------------------------- 
(It took A LOT of playing around to get this figured out!) 
the first  is forward & backwards
the second is left & right
the third is up & down  
ex.:  smoke.0= 1st,  2nd,  3rd , fx_eng_exhaust_gry
Hope this helps!