Dialing in is how you tune a new coffee until it tastes right: you adjust the grind (and sometimes the dose) until the shot runs in your target time and ratio, then fine-tune to taste.
It sounds fiddly, but it comes down to a simple loop — change one thing, taste, repeat — and stable equipment makes it far easier.
The variables and a starting point
A common starting recipe is a 1:2 ratio — for example 18g of coffee in, about 36g of espresso out — in roughly 25–30 seconds. Weigh your input and your output with a scale.
Grind size is your main lever: finer slows the shot and raises extraction, coarser speeds it up and lowers it. Change grind first, holding dose and ratio steady, until the timing lands.
Troubleshooting by taste
Sour, thin and fast usually means under-extracted: grind finer. Harsh, bitter and slow usually means over-extracted: grind coarser. Adjust one variable at a time so you can actually learn what changed the cup.
This is exactly why a PID and a consistent grinder help so much — they remove the random noise, so the only thing changing is what you chose to change.
What it means when you're buying
Dialing in is far easier with stable temperature (a PID helps) and a consistent, low-retention grinder. A scale and a timer are cheap essentials. If you find dialing in frustrating, the usual culprit is an inconsistent grinder rather than the machine.
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Frequently asked questions
What ratio and time should I aim for?
A 1:2 ratio in about 25–30 seconds is a solid starting point. Treat it as a baseline, then adjust to taste for each coffee.
My shot tastes sour — what do I change?
Sour usually means under-extraction: grind finer (and check the shot is not running too fast). Bitter usually means over-extraction: grind coarser.
Why does dialing in feel so hard on my setup?
Most often the grinder is the limit. An inconsistent grinder or wandering temperature makes results unrepeatable no matter what you do.