Extremely slow extrusion

I'm betting you're getting poor pellet feed. If you mount vertically, pellet feed and hopper design are very important. Can you post a picture of what hopper you're using?

Increasing temperature does decrease diameter.

167C is cold for ABS. I extrude at 180C and get 1.65-1.70mm, though I run horizontally and without a winder.

Check to see if your barrel might have rotated, taking the opening out of line with the hopper.  Mine is prone to doing that if I let it get down into the 160s.

Isn't that where someone had suggested stealing your girlfriends vibrator?

Ralph

It worked ten times better than the old one. I'm getting way faster speeds, but still not as fast as I would like. I'm getting about 5 to 6 inches per minute at about 170 degrees Celsius. That's giving me an average of 2.8mm filament thickness. if I raise the temperature anymore, it might speed things up a bit but then my filament thickness will decrease. I'm not sure what to do here...

Let me ask you something... Let's say my filament thickness was 2.3mm (for example), and I used it in my 3D printer, and of course assuming I told my slicing software that actual filament thickness was 2.3mm, would this technically not produce the same results as 3mm filament? Or am I sadly mistaken? What if we went to the extreme and fed 1.75mm filament into a 3mm extruder? What would happen, assuming the hobbed bolt was able to push it down? My understanding is that to compensate for the filament being under size, extrusion would speed up.

Yes, that makes sense, that the filament would get scrunched up due to heat.
I did upload the new 3mm firmware successfully, and although I did not do an actual test, I did run a "dry test" and it seems like the filament guide is moving the correct distance.
Anyways, yes, I'd be happy to post pictures! (Do not be fooled by the filament cooling fan in the pictures. Although it's there, it has never been used with the vertical setup. Come to think of it, I wonder how it would affect filament thickness. The filament would harden more quickly, thereby reducing the amount of stretch which would decrease filament thickness... Something to try.

PS. The FilaWinder is absolutely brilliant! But I do have one design related suggestion that would improve it when working with 3mm filament. I can see how it would work fine as it is with 1.75mm filament, but due to the added stiffness of 3mm filament, the servo motor is having a heck of a time moving the filament back and forth primarily due to the small distance between the filament guide and and the spool. This distance will only get smaller as the spool fills up. I realize that the servo motor can be moved further away from the spool by a couple inches, but then it would decrease the distance between the filament guide and that bottom plate with the PTFE, which would still make it difficult for the servo motor to move the filament. I plan to increase the size of the base and increase these distances, but just something to keep in mind for those of us that use 3mm filament.

Sorry, some of the pictures came out side ways... I'll fix that when I have some time... gotta go to work.

ABS
I got my fan setup in such a way that it never blows on the nozzle. Metal sheet on the side to deflect the flow from the nozzle and another at the bottom to curl up all the flow and direct it on to the filament as much as possible (there is a better way).

So if u run (have just dried for 2hrs) ABS at 175c and at 195c and getting about same diameter at 1.5 to  1.6mm, what does that mean ?
3 1/2 feet above the floor, not perfectly vertical, slightly toward the front