The G4X MonsoonX sits between the AtomX and StormX in Link Engine Management’s G4X wire-in range. It is the correct choice for turbocharged four-cylinder builds that need VVT cam control, closed-loop boost management, launch control, and anti-lag — features absent from the AtomX — without requiring the StormX’s 8-cylinder sequential capability. The MonsoonX shares the same G4X microcontroller, PCLink software, and 34-pin Connector A as the AtomX, so a loom built for the AtomX transfers directly if upgrading later. An onboard MAP sensor (4-bar or 7-bar, specified at order) and a separate barometric pressure sensor for real-time baro correction are both included, eliminating two external sensors from the install.
Note on I/O planning: the MonsoonX supports all its advanced features, but available auxiliary outputs constrain how many can be active simultaneously. A build combining dual-VVT, closed-loop boost, and idle control will consume all 6 auxiliary outputs. Plan the I/O allocation before committing — or step up to the StormX for more headroom.
Technical Specifications
| Property | Value |
|---|---|
| SKU | 127-4000 |
| Platform | G4X |
| Connector | 34-pin Tyco/AMP waterproof — Connector A (TKA kit, sold separately) |
| Injection drives | 4 (high-impedance / saturated injectors only) |
| Ignition drivers | 4 |
| Auxiliary outputs | 6 |
| Analogue voltage inputs | 4 |
| Analogue temperature inputs | 2 |
| Digital inputs | 4 |
| Trigger inputs | 2 |
| Knock inputs | 1 (V3 hardware — current production) |
| CAN bus | 1 |
| USB tuning port | 1 (PCLink) |
| Onboard MAP sensor | 4-bar or 7-bar (specify at order) |
| Onboard barometric sensor | Yes — real-time baro correction |
| 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 | 95 × 130 × 45 mm |
| Weight | 220 g |
| Software | PCLink (free download, no subscription) |
Engine Configurations Supported
| Configuration | Capability |
|---|---|
| Sequential injection + direct spark | Up to 4 cylinders / 2 rotors |
| Batch fire | Up to 8 cylinders |
| Wasted spark | 2–8 cylinders |
| Group fire / distributor | Up to 12 cylinders |
| VVT cam control | Up to 2 cams, closed-loop |
| Odd-fire engines | Supported |
| 2-stroke engines | Supported |
4-Bar vs 7-Bar MAP Sensor
| Variant | Pressure range | Typical application |
|---|---|---|
| 4-bar MAP | Up to ~3 bar (44 psi) above atmospheric | Most turbocharged 4-cylinder and 2-rotor builds |
| 7-bar MAP | Up to ~6 bar (87 psi) above atmospheric | High-boost rotary, extreme-boost 4-cylinder builds |
Both variants share SKU 127-4000. Specify at order. Either unit can also reference an external MAP sensor on an analogue input.
What You Can Do With It
- Control VVT on up to two cams simultaneously — Toyota 2ZZ-GE, Honda K-series i-VTEC, Nissan VVL, and other dual-VVT engines fully supported
- Manage turbo boost in closed-loop via the onboard MAP sensor — ECU adjusts wastegate solenoid duty against a target boost level in real time
- Activate launch control and anti-lag via a dedicated launch input or brake-switch trigger
- Map fuel and ignition on any 4-cylinder engine with full sequential injection and direct spark
- Run 2-rotor Wankel engines (13B, 20B) with sequential injection; use the 7-bar MAP variant for high-boost rotary builds
- Batch-fire six or eight cylinders when sequential injection is not required
- Log up to 250 channels at 1 kHz each across 512 MB with real-time baro correction from the onboard sensor
- Monitor and control knock via the onboard knock input (V3 hardware — current production)
- Use PCLink Maths Blocks to write custom algebraic control strategies without custom firmware
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, 7-bar MAP option |
| StormX | 8 | 8 | 8 | 8 | + Stepper idle, gear shift control, trigger oscilloscope |
| XtremeX | 8 | 8 | 10 | 8 | + E-throttle, traction control, cruise control, 2× CAN |
| FuryX | 8 | 6 | 10 | 6 | + Onboard wideband lambda |
All G4X models share the same microcontroller and PCLink software. No separate licence tiers — the ECU firmware determines available features.
In the Box
- LinkECU G4X MonsoonX ECU
- USB tuning cable
- Mounting bracket
- Waterproof connector
- PCLink software — free download from linkecu.com
Required accessories (not included):
- LinkECU Connector A Kit — 34-pin Tyco/AMP connector kit (TKA) to terminate or build the wiring loom
- Link ECU Loom A — 2.5 m — pre-terminated flying-lead harness
Recommended accessories:
- LinkECU CAN Lambda Controller — LSU 4.9 wideband via CAN; no onboard wideband on MonsoonX
- LinkECU Knock Sensor with Loom (KNSB) — wideband piezo knock sensor, pre-wired for the Connector A footprint
Frequently Asked Questions
What is the difference between the 4-bar and 7-bar MAP variants?
The 4-bar sensor covers up to approximately 3 bar above atmospheric — sufficient for the majority of turbocharged four-cylinder and two-rotor builds. The 7-bar sensor covers up to approximately 6 bar above atmospheric and is the correct choice for high-boost rotary engines and extreme-boost applications. Both variants share SKU 127-4000; specify at order. Either variant can also reference an external MAP sensor on an analogue input if needed.
Does the MonsoonX support knock control?
Yes, on V3 hardware (current production). The V3 MonsoonX has a dedicated knock input and onboard knock control in PCLink — no external KnockBlock module is required. Note that earlier V2 units lack the knock hardware despite having a knock input pin; current stock ships as V3.
How many VVT cams can the MonsoonX control?
Up to two cams in closed-loop. This covers dual-cam applications such as the Toyota 2ZZ-GE, Honda K-series i-VTEC, and Nissan VVL. Each VVT cam consumes one auxiliary output and one digital input — with 6 aux outputs total, plan I/O allocation carefully if enabling dual-VVT alongside boost and idle control.
Can the MonsoonX run a 6- or 8-cylinder engine?
In batch fire mode with wasted spark ignition, yes. Sequential injection and direct spark are limited to 4 cylinders (or 2 rotors). For a 6- or 8-cylinder build requiring full sequential injection, the StormX is the appropriate step up.
Is the MonsoonX loom compatible with the AtomX?
Yes. Both the AtomX and MonsoonX use the identical 34-pin Connector A (TKA kit). Upgrading from AtomX to MonsoonX requires no rewiring — loom, connector, and pinout are identical. This is a key advantage when specifying an upgradeable harness at the start of a build.
What does the StormX add that the MonsoonX does not?
The StormX doubles injection and ignition channels to 8 each, enabling 8-cylinder sequential or 4-rotor sequential. It also adds stepper motor idle control, full gear shift / paddle shift control, a built-in trigger oscilloscope, a second knock input, and rotary oil metering pump control. The StormX does not include an onboard MAP sensor.
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