Quester wrote:What a great idea you guys! Now I'm noodling how to mod my GS3 . . . .
Boy, if that isn't the question of the year! Ever since I got my first BDB when they first came out in fall of 2011, I always told myself I'd just see what this dalliance was all about, then I'd cut to the chase and get a GS/3... And, yet... over the years, this little dalliance was able to keep up with all the hottest extraction techniques, while also proving quite reliable to boot... It just has never (yet) given me good reason to leave. It's the darndest thing.
As to flow profiling the GS/3, it seems like your best/easiest route would be to rock it old skool and go the "Slayer" route. By this I mean, instead of having the whole shot under our direct control from start to finish through the needle valve like you do now with your BDB, you would plumb in a second path, one for high/normal flow, and one for low/pre infusion flow. This second path will have a needle valve that you pre set before the shot, but have no direct, on-the-fly control over. If you don't like where it's set, adjust it up or down before your next shot, and repeat until it's to your liking. You start your extraction in low flow, then switch to high for the main part, then back to low, to finish. Having only two discrete flows sounds crude in comparison to what we have now, but I and some others suspect that while it's crude, it still captures a lot of the benefit of full control all the time, even if it's not quite
as capable. Look up HB'er Shawndo. I think he did this on his LM Shot Brewer (GS/3 without steam). Otherwise you are looking a Assaf's "Chimera" gear pump with Arduino custom controller or Pepperssas Dick Green's similar. These sound immensely capable, though they are using gear pumps on a custom controller for precise flow control. Might be a considerably bigger job than taking the "Slayer approach".