I've recently been on a grind to save as many framerules as I could. I have already saved 1-1 and 4-1 because of similarity and 8-3 is also similar. I just don't know what the setup is for getting 8-3 FPG(not FPG setup but the setup on the pipe to waste time and get subpixels). Thanks to anyone who responds.

if you have pellsson rom, full jump on frame 147 from the top platform in the second set of bros. visual cue would be that your jump arc aligns with the right side of the outline of the cloud. this full jump should land you on the earliest portion on the backlip of the pipe, i.e., frame 146 (the frame before the desired frame) kills mario

after doing the full jump, make sure to release B such that you're walking the entire time you're on the backlip. once you walk past the backlip and in mid air, repress B. subpixels would be F7 flashing

thanks

what framerule should i start on to get optimal bros and so frame 147 lines up?

if you're just grinding for an IL, any framerule would be fine. if the second set of bros has one on top, you can try to manip by bopping the parakoopa before the second set (usually the one when you're still going up on your jump)

I think I just got it but confirming. The pellson rom says 32.23. Is that the save?

yes you did. GGs man. you got R10 on the upper right as well, which is the usual R for 8-3 fpg, although sometimes it's R9 if slower FPG