if you go looking around siemens' website, they have advertised the SD60s have linear capabilities at lower pulsewidths, and the advertised minimum injector pulsewidth is 1.5ms
somewhere around there the linearity changes or whatever. ive found if i set my min pw to the 1.5ms (on the 3100 v6 i had them in) it was always really saturated and threatened to be rich at idle and transients almost assuredly resulted in some misfiring.
however, if i set my min PW at .50, it seemed to idle very stable and transients didnt cause misfires.
i also want to note that the transition from 1.5ms to anything higher always resulted in misfires, unless i started with a smaller minimum injector pulsewidth.
the car would idle pretty good around 1.3ms, cruise at around 1.5-1.8ms as i recall.
minimum injector pulsewidth might not be a parameter hptuners has mapped for your PCM, but if its a P04, you can map the parameter yourself. theres a tutorial to creating parameters floating on this forum.
next up,
this is a subject of alot of controversy: but i found if i tuned my VE table, transients were really smooth with the SD60s also. alot of guys say its not necessary in the maf based systems, but again, and what feels like for once and for all; ***alot of them use VE for transients***. its a parameter that was never mapped by the coders in hptuners for the P04, but its a parameter that can be created using TunerPRo. its called "transient airmass calculation", and again most of the fwd v6's ive messed with are set to use the VE for transients. 3100, 3400, 3800 v6s
attached is the last running tune i had of my turbo 3100 lumina with sd60s as well as some pertinent data for sd60s in LS1 pcms.
if its manifold referenced FPR with a return, copy the first lines at 0kpa, and put them accross the table to 100kpa. if its non vac referenced FPR, you'll need to do some math for the 100kpa segment if this provided data doesnt suit.
hope some of this helps.
Deka 60s Conversion.xlsx
99 lumina 5psi maf SD60.hpt