The Rocket R58 TUNE expands the classic dual-boiler workflow with a targeted three-phase extraction. Rocket describes TUNE as allowing both the pre-infusion and final phase to be time-controlled at a fixed pressure of 3 bar. The main extraction phase runs in between. This opens up room for experimentation - but only if your basic recipe is already working.
Phase 1: controlled saturation
The 3-bar pre-infusion is intended to saturate the puck more evenly before full extraction pressure is applied. With the R58 TUNE Black, you can adjust the duration of this phase. Longer is not automatically better; the beans, grind size, and puck preparation also play a role.
Phase 2: classic main extraction
Most of the extraction takes place in the middle of the shot. Assess the flow, extraction time, and taste here as you would with any other espresso. If a shot runs dramatically too fast or too slowly, you should adjust the grind size first rather than using TUNE to mask the problem.
Phase 3: gentle finish
Rocket uses 3 bar again during the final phase. The goal is a gentler end to the extraction. How noticeably you perceive this section depends on the coffee and the recipe. Especially with longer shots, it is worth comparing the taste rather than just collecting numbers.
Simple testing procedure
First, pull a standard shot without making major profile changes. Then change only the pre-infusion. If you can taste a clear difference, test the final phase separately. This will help you learn the system faster than using a complicated profile with three timings changed at once.
You can find the basics in Rocket R58 TUNE in detail.
FAQ
Is TUNE full free pressure profiling?
Rocket describes time-controlled 3-bar phases at the beginning and end, not an arbitrarily shaped pressure curve.
Can TUNE fix channeling?
It can support saturation, but it does not replace proper puck preparation.
Which beans benefit?
This cannot be determined universally. The benefit should always be evaluated by taste with the specific coffee.
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