How to make a Turbo Shot Espresso at home

For decades, the coffee world has whispered a sacred, immutable “golden ratio” for Espresso: grind 18g of coffee extremely fine, apply 9 bars of pressure, and extract 36g of liquid in exactly 30 seconds. But this post will introduce you to a concept that is completely disrupting the home barista community: the Turbo Shot. A brewing style that defies every textbook rule.

Coarser grind, lower pressure, twice as fast to brew, yet yielding a sweeter cup with a significantly higher extraction.

“Grinding too fine” is not as good for your coffee as you think

The Turbo Shot trend is no fleeting social media gimmick created by amateurs. It stems from a rigorous physics study titled “Systematically Improving Espresso: Insights from Mathematical Modeling and Experiment”, published in the prestigious scientific journal Matter in January 2020. The research was spearheaded by computational materials chemist Christopher Hendon (University of Oregon).

Hendon and his colleagues pointed out a harsh paradox: people constantly try to adjust their grinders to an ultra-fine setting in hopes of extracting the maximum sweetness. In reality, however, when the coffee is ground too fine, the bed inside the portafilter clumps together into a dense, impenetrable “brick wall”.

Under the immense 9 bar pressure of the pump, water cannot seep smoothly through this wall. Instead, it is forced to tear through the weakest points to create escape routes – a phenomenon known as Channeling. Consequently, the areas blasted by the water become bitterly astringent due to over-extraction, while the surrounding dry, packed pockets remain sour because the water never even reached them.

(Image source: James Hoff Mann – Reddit)

The barista organization Barista Hustle calls this limiting phenomenon “The Espresso Extraction Ceiling”. This means that even though you waste 18g of expensive coffee, you are actually only “squeezing” flavor out of a small fraction of it.

The 3 mechanical pillars to brew a “Turbo shot”

To break down that “brick wall”, Hendon’s research team proposed a completely inverted recipe, consisting of 3 mechanical pillars:

1. Coarser Grind: Instead of grinding it as ultra-fine as flour, loosen your grinder’s adjustment dial to a slightly coarser setting. The puck will now become fluffy and porous, creating countless uniform, microscopic gaps that allow water to navigate through every single coffee particle without getting clogged.

2. Lower Pressure to 6 Bar: Traditional 9-bar pressure is too aggressive for a fluffy coffee puck, risking blowing it apart. Therefore, a Turbo Shot requires lowering the machine’s brewing pressure to 6 bar.

3. High yield & rapid flow rate: Because the puck is coarser and more porous, water will rush through very quickly. Instead of waiting a sluggish 30 seconds for a traditional 1:2 ratio, a Turbo Shot actively stretches the yield to a 1:3 ratio (e.g., using 15g of ground coffee to extract 45g of liquid). The entire process happens in a flash: in only about 15 seconds.

A gentler 6-bar flow is stable enough to fully saturate the puck, dissolving flavors evenly without tearing the structure of the coffee bed.

Why does a faster brew taste better?

Brewing in just 15 seconds? It sounds like the resulting cup would be incredibly watery and weak. Yet, blind tastings and scientific measurements have proven the exact opposite, sparking an explosive trend across forums like r/espresso and r/coffee throughout 2021 and 2022.

• A Burst of Sweetness: Because the water flows through the porous coffee bed at high speed and perfect uniformity (with zero channeling), it rapidly extracts all the vibrant sugars and fruit acids, rushing into the cup before it can dissolve the bitter, astringent woody fibers (tannins) that require more contact time to extract. Coffee expert Scott Rao has shared multiple times on his blog that this recipe yields an incredibly clean, sweet espresso completely devoid of any harsh astringency.

• Saving 25% of your coffee: This is the ultimate money-saving takeaway of Hendon’s study. Thanks to the perfect flow, the Extraction Yield (EY) skyrockets to its maximum potential. Instead of cramming 18g or 20g of coffee into the basket, which was previously done just to compensate for the wasted, clogged-up grounds, a Turbo Shot only requires a mere 15g to extract the exact same amount of total flavor.

• Highly Forgiving: This technique is incredibly forgiving for home baristas. Because the grind is coarser, you aren’t pressured to buy an expensive, top-tier grinder just to avoid “micro-fines”. You can also skip those highly stressful, meticulous WDT distribution techniques. The failure rate of a Turbo Shot is virtually zero.

How to practice the “Turbo shot” at home?

If you want to experience the science of the Turbo Shot on your own machine, here is the ultimate baseline recipe to get started:

1. Lower the Pressure: If your machine (such as Breville/Sage or E61 groups) features an adjustable Over-Pressure Valve (OPV), dial it down to 6 bar. (Tip: If your machine isn’t adjustable, you can exploit the Pre-infusion mode by holding down the brew button to force a low-pressure water discharge, or slightly crack open the steam valve to bleed off internal pressure).

2. Downdose the Coffee: Place exactly 15g of ground coffee into the filter basket instead of the usual 18g.

3. Coarsen the grind size: Coarsen your grinder setting by about 2 to 3 notches from your normal position. The resulting grounds should look visibly larger and more discrete compared to standard espresso powder.

4. The operation: Pull the shot. The water will gush out rapidly like a waterfall (don’t panic, this is exactly what we want). Stop the extraction once your scale reads 45g of liquid yield. At this point, the timer should clock in at right around 15 seconds.

The Turbo Shot was not created to “kill off” traditional espresso. Its crema might be a bit thinner, and its body lighter. If you prefer a syrupy, thick espresso, the traditional method remains your perfect match. However, if you are holding a bag of expensive, light-roast beans packed with delicate floral and fruity notes, and you crave a vibrant, incredibly sweet cup that also saves on ingredients, then the physics-backed masterpiece known as the Turbo Shot is the “new horizon” you absolutely must explore.

In our previous posts, we brought out every “weapon” in our arsenal – from WDT distribution needles to bottom paper filters for a Filter Sandwich – all to defeat a single enemy: Channeling. Yet, with this completely different approach, we can crush Channeling without needing a single extra accessory, while even helping you save a significant amount of coffee every day. So, is it worth a try?