Total control in the palm of your hand.
The most compact programmable ECU we've ever built: 75 × 72 mm, 1 to 6 cylinders, a built-in 4 bar MAP sensor and tuning over USB-C with TunerStudio. Ready for your next build.
Pay in interest-free installmentsChoose the term at checkout · regular price, no promotions.
Black Friday: free shipping and a free STR T-shirt with your ECU
Every detail
has a purpose
Select a point on the render to learn about each part of the ST Mini.
Get yours,
in 8 colors
The same ST Mini, with a carbon fiber finish, now in your project's color.
Tap to see it · again to choose it
See it from
every angle
From the pinout-printed lid to the Molex connector and the MAP elbow.
Renders of the launch housing; the final product's finish may vary.
One hose and you're set
The 4 bar MAP sensor is soldered to the board and its port exits through a 90° elbow on the side. Run the included hose from the intake manifold: no external sensor, no extra wiring.
- 4 bar MAP: ideal for naturally aspirated and turbo engines
- 90° barbed elbow · 1.5 m hose included
- Ideal for speed-density tuning (MAP × RPM)
Fits where others won't
Full injection and ignition control in a body that fits under the seat, behind the dash or in the engine bay.
- Ideal for motorcycles, ATVs, karts and swaps
- 3 injection and 3 ignition channels
- 20-pin Molex connector with 1 m of wire included
TunerStudio ready
Connect over USB-C and tune fuel, timing, cold start and rev limits live. It ships with a base map so you start fast.
- Real-time adjustments with the engine running
- Datalogging to fine-tune your calibration
- Drivers and installation guide in our support section
Backed by the people who build it
We design, assemble and test every ST Mini in Costa Rica. If you need help, you talk directly to the team that developed it.
- 1-year warranty against manufacturing defects
- Technical support on WhatsApp
- Dealer network across Central America
Pinout
20 pins in a single latching connector, with a color-coded harness and shielded wire for the crank sensor. The same layout is printed on the lid.
| Pin | Signal | Function | Wire |
|---|---|---|---|
| 1 | VR− IN | VR crank sensor (−) | Black shielded |
| 2 | VR+ IN | VR crank sensor (+) | Red shielded |
| 3 | GND | Power ground | Brown |
| 4 | CLUTCH IN | Clutch switch | Black |
| 5 | IAT | Intake air temperature sensor | Light green |
| 6 | CLT | Coolant temperature sensor | Pink |
| 7 | TPS | Throttle position sensor | Tan |
| 8 | FUEL PUMP | Fuel pump relay | Light blue |
| 9 | TACH | Tachometer signal | Gray |
| 10 | +12V BAT | 12 V supply (2 A fuse) | Red |
| Pin | Signal | Function | Wire |
|---|---|---|---|
| 11 | HALL CKP | Hall crank sensor | Black shielded |
| 12 | SGND | Sensor ground | Brown |
| 13 | INJ 3 | Injector 3 | White |
| 14 | INJ 2 | Injector 2 | White |
| 15 | INJ 1 | Injector 1 | White |
| 16 | IGN 3 | Coil 3 | Yellow |
| 17 | IGN 2 | Coil 2 | Yellow |
| 18 | IGN 1 | Coil 1 | Yellow |
| 19 | FAN | Fan relay | Purple |
| 20 | VCC 5V REF | 5 V sensor reference (0.5 A resettable fuse) | Red |
Pin numbering follows the CN1 schematic. Always double-check against the manual before powering up.
Datasheet
Everything you need to know before installing your ST Mini.
| Cylinders | 1 to 6 (3 injection + 3 ignition outputs) |
|---|---|
| Housing | Carbon fiber finish · 75 × 72 × 25 mm |
| Connector | 20-pin Molex Micro-Fit 3.0 |
| Harness | Included, 1 m of wire · 2 m option (+$35) |
| Wires | Color-coded by function · shielded wire for VR and Hall |
| PC connection | USB-C (opposite the connector) |
| USB cable | 1 m USB-C cable included |
| MAP sensor | Built-in, 4 bar · 90° vacuum elbow on the side |
| Crank sensor | VR or Hall |
| Inputs | TPS, coolant temperature (CLT), intake air temperature (IAT), clutch |
| Outputs | 3 injection and 3 ignition outputs (up to 2 cylinders per output), fuel pump relay, fan relay, tachometer signal |
| Protection | +12 V with a 2 A fuse · 5 V (VCC) reference with a 0.5 A resettable fuse |
| Includes | 1 m (or 2 m) harness, 1 m USB-C cable and 1.5 m MAP sensor hose |
| Software | TunerStudio |
| Warranty | 1 year |
Launch specifications: subject to change without notice.
Ready to install
Base map preloaded
20-pin Molex Micro-Fit · 2 m option (+$35)
To connect your laptop and tune
For the built-in 4 bar MAP sensor
Help with your installation
Against manufacturing defects
ST Mini vs. the lineup
| Feature |
New
ST Mini | 
ST-02 |
Best seller
ST-04 |
5" display
ST-100 |
|---|---|---|---|---|
| Price | $340 | $555 | $665 | $885 |
| Cylinders | 1 – 6 | 1 – 4 | 1 – 8 | 1 – 8 (batch) |
| Sequential injection | — | — | Up to 4 cyl. | Up to 4 cyl. |
| Connector pins | 20 (Molex) | 24 | 48 | 34 |
| MAP sensor | Built-in, 4 bar | Built-in, 4 bar | Built-in, 4 bar | Built-in, 7 bar |
| Display | — | — | — | 5" touchscreen |
| Dimensions | 75 × 72 mm | 121 × 110 mm | 130 × 115 mm | 154 × 98 mm |
| PC connection | USB-C (1 m cable) | USB-C (1 m cable) | USB-C (1 m cable) | USB type B (1 m cable) |
| Harness included | 1 m (2 m optional) | 2 m | 2 m | 2 m |
| MAP hose | 1.5 m included | 1.5 m included | 1.5 m included | 1.5 m included |
| Outputs | ||||
| Injection outputs | 3 (up to 6 cyl.) | 2 (up to 4 cyl.) | 4 (up to 8 cyl.) | 4 (up to 8 cyl.) |
| Ignition outputs | 3 (up to 6 cyl.) | 2 (up to 4 cyl.) | 4 (up to 8 cyl.) | 4 (up to 8 cyl.) |
| Fuel pump, fan and tach | Yes | Yes | Yes | Yes |
| Idle valve (IAC) | — | Yes | Yes | Yes |
| Boost solenoid | — | Yes | Yes | Yes |
| VVT | — | 1 output | 2 outputs | 2 outputs |
| Programmable output | — | — | Yes | Yes |
| Inputs | ||||
| Crank sensor | VR or Hall | VR or Hall | VR or Hall | VR or Hall |
| Cam sensor | — | VR or Hall | VR or Hall | VR or Hall |
| O2 / wideband sensor | — | Yes | Yes | Yes |
| Launch control (clutch) | Yes | Yes | Yes | Yes |
| Flex fuel | — | — | Yes | Yes |
| Speed sensor | — | — | Yes | Yes |
| Each injection and ignition output drives up to 2 cylinders: 4 outputs run a V8. | ||||
| Actions | View ST Mini | View ST-02 | View ST-04 | View ST-100 |
The ST Mini covers the essentials to run your engine: injection, ignition, fuel pump, fan and tach, from 1 to 6 cylinders. If your project needs idle control, an O2 sensor, VVT, boost or a cam sensor, the closest option is the ST-02 (up to 4 cylinders); for 5 to 8 cylinders, the ST-04.
About the ST Mini
Got another question? Message us and we'll reply within minutes.
What kind of engines is the ST Mini for?
It runs 1 to 6 cylinders with 3 injection and 3 ignition channels: motorcycles, ATVs, karts, swaps and any engine where space is tight.
Which crank sensor does it accept?
The ST Mini has inputs for a VR (variable reluctance) or Hall-effect crank sensor, plus TPS, coolant temperature (CLT) and intake air temperature (IAT).
Do I need an external MAP sensor?
No. The ST Mini has a 4 bar MAP sensor built into the board. Just run the included 1.5 m hose from the intake manifold (after the throttle body) to the vacuum elbow on the side.
Can I get a longer harness?
Yes. The ST Mini includes a 1 m harness, and when you order you can choose the 2 m option for an extra $35.
What do I need to install it?
The ST Mini comes with the 1 m harness, the USB-C cable and the MAP hose. You only need your engine's sensors (temperatures, throttle, trigger wheel or distributor) and a laptop with TunerStudio.
Can I carry over my tune from another SpeedTech ECU?
Yes. Since it uses TunerStudio you can start from your current maps; our team will help you adapt the setup to the ST Mini.
How long does shipping take?
Within Costa Rica we ship by Correos de Costa Rica (usually 2 to 4 business days). To the rest of the Americas, Europe and the rest of the world we ship by DHL Express (3 to 5 business days).
Does it have a warranty?
Yes: a 1-year warranty against manufacturing defects and direct technical support from our team.
Your next build starts here
Reserve your ST Mini today or talk to a technician to confirm it's the right ECU for your engine.