The G4X StormX is the mid-range wire-in ECU in Link Engine Management’s G4X range. It is the correct choice when a build outgrows the MonsoonX’s 4-cylinder sequential ceiling: any 5–8 cylinder engine requiring full sequential injection and COP ignition, any 3–4 rotor rotary, any engine using a factory stepper motor idle air control valve, or any motorsport build needing gear shift control for a sequential or paddle-shift gearbox. The StormX uses two 34-pin Connector A and Connector B plugs, providing the I/O headroom to support these applications without an external expansion module. Unlike the MonsoonX, the StormX does not include an onboard MAP sensor — an external pressure sensor on one of the 8 analogue inputs is required.
Technical Specifications
| Property | Value |
|---|---|
| SKU | 108-4000 |
| Platform | G4X |
| Connectors | Two × 34-pin waterproof — Connector A (TKA kit) + Connector B (TKB kit), sold separately |
| Injection drives | 8 (high-impedance / saturated injectors only) |
| Ignition drivers | 8 |
| Auxiliary outputs | 8 |
| Analogue voltage inputs | 8 |
| Analogue temperature inputs | 3 |
| Digital inputs | 8 |
| Trigger inputs | 2 |
| Knock inputs | 2 |
| Sensor power supply | +5 V and +8 V |
| CAN bus | 1 |
| USB tuning port | 1 (PCLink) |
| Onboard MAP sensor | None — external sensor required |
| VVT cam control | Up to 4 cams, independent closed-loop |
| Supply voltage | 8–22 V |
| Operating temperature | −30°C to +90°C ambient |
| Onboard data logging | 512 MB, 32-bit, up to 250 channels |
| Max logging rate | 100 kSamples/sec (1 kHz per channel max) |
| Dimensions | 170 × 130 × 44 mm |
| Software | PCLink (free download, no subscription) |
Engine Configurations Supported
| Configuration | Capability |
|---|---|
| Sequential injection + direct spark | Up to 8 cylinders / 4 rotors |
| Batch fire | Up to 12 cylinders |
| Wasted spark | 2–12 cylinders |
| Distributed / group fire | 1–12 cylinders |
| VVT cam control | Up to 4 cams, independent closed-loop |
| Odd-fire engines | Supported |
| 2-stroke engines | Supported |
| Rotary oil metering pump | Supported |
What You Can Do With It
- Run full sequential injection and COP ignition on inline-6, V8, and 4-rotor engines — RB26DETT, 2JZ-GTE, 1UZ-FE, Barra, LS1/LS3, 20B peripheral-port and bridge-port
- Control stepper motor idle air control valves natively — Subaru EJ, Toyota 1JZ/2JZ-NA, Nissan SR20DE, and other JDM engines with 4- or 6-wire stepper IACVs
- Activate full gear shift control with flat-shift, ignition cut, and fuel cut strategies for sequential and dog-ring gearboxes (Sadev, Hewland, Quaife, and OEM sequential boxes)
- Diagnose trigger signal issues using the built-in trigger oscilloscope — no external scope needed
- Control rotary oil metering pump output on 13B and 20B Wankel engines
- Manage up to 4 independent closed-loop VVT cams — dual VVTI engines such as 1GR-FE, 2GR, BMW N-series, and Honda K-series with intake + exhaust cam phasers
- Detect and respond to knock on two independent channels — no external knock amplifier required
- Log up to 250 channels at 1 kHz each across 512 MB; download at 16× the speed of the G4+ platform
- Connect a CAN wideband, a CAN dash, and additional CAN devices on the single CAN bus
G4X Family Comparison
| Model | Inj | Ign | Aux | Max Seq Cyl | Key additional features |
|---|---|---|---|---|---|
| AtomX | 4 | 4 | 4 | 4 | Open-loop boost, knock |
| MonsoonX | 4 | 4 | 6 | 4 | + VVT (2 cams), closed-loop boost, launch, anti-lag, onboard MAP |
| StormX | 8 | 8 | 8 | 8 | + Stepper idle, gear shift, trigger oscilloscope, rotary oil metering, 4-cam VVT |
| XtremeX | 8 | 8 | 10 | 8 | + E-throttle, traction control, cruise control, 2× CAN |
| FuryX | 8 | 6 | 10 | 6 | + Onboard wideband lambda, all XtremeX features |
All G4X models share the same microcontroller and PCLink software. No separate licence tiers — ECU firmware determines available features.
Connectors and Loom
The StormX uses two 34-pin waterproof connectors (Connector A and Connector B). Connector A covers primary inputs and outputs for most 4-cylinder applications; Connector B provides the additional I/O for 6/8-cylinder sequential, the second knock input, and extended auxiliary outputs.
- LinkECU Connector A Kit — TKA 34-pin kit
- LinkECU Connector B Kit — TKB 34-pin kit
- Link ECU Loom A — 2.5 m — flying-lead harness
Recommended accessories:
- LinkECU CAN Lambda Controller — LSU 4.9 wideband via CAN; no onboard wideband on StormX
- LinkECU Knock Sensor with Loom (KNSB) — wideband piezo knock sensor; 2× sensors supported
Frequently Asked Questions
The MonsoonX already has launch control and closed-loop boost — what does the StormX actually add?
Three decisive additions: (1) full 8-cylinder sequential injection and COP ignition — the MonsoonX caps at 4-cylinder sequential; (2) stepper motor idle control, so factory 4- and 6-wire stepper IACVs work natively; (3) full gear shift control for flat-shift and ignition cut on sequential gearboxes. The trigger oscilloscope, rotary oil metering pump control, second knock input, and up to 4 VVT cams are also exclusive to the StormX and above. If none of those apply to your build, the MonsoonX covers it.
Does the StormX support drive-by-wire throttle bodies?
No. E-throttle control requires the XtremeX or FuryX. The StormX is the correct choice for any build retaining a cable throttle.
Does it support peak-and-hold (low-impedance) injectors?
No. The StormX injection drives are high-impedance (saturated) only — standard 12–16 Ω injectors. Peak-and-hold (2–3 Ω, e.g. many Bosch motorsport EV1 series) requires the XtremeX or FuryX. For most 4–8 cylinder builds on Bosch EV14, Siemens/VDO, Injector Dynamics, or RC Engineering injectors this is not a limitation.
The StormX has only one CAN channel — is that enough for a wideband and a dash?
Yes, for most builds. Placing both a CAN Lambda and a CAN dash on the same CAN bus is standard practice — they communicate at different CAN IDs without interference. If you also need a CAN-connected PDM or transmission controller on the same bus, evaluate whether the two CAN channels on the XtremeX provide a cleaner architecture.
Do I need an external knock amplifier with the StormX?
No. The StormX has two dedicated hardware knock inputs that connect directly to standard knock sensors. Onboard processing replaces any external KnockBlock or KnockLink module. This is a key difference versus the MonsoonX, which requires an external device for knock sensing.
Does the StormX have an onboard MAP sensor like the MonsoonX?
No. The StormX requires an external MAP sensor wired to one of the 8 analogue inputs. The onboard MAP sensor is a feature of the AtomX and MonsoonX only. An external sensor gives more flexibility in sensor placement and boost range selection.
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