The G4X XtremeX is the wire-in ECU in Link Engine Management’s G4X range that adds drive-by-wire E-throttle, traction control, and cruise control to the already capable StormX foundation. It shares the same 8-injector and 8-ignition output count as the StormX but adds four more analogue inputs (11 total), a second CAN bus, and the three features that define the step up. It is the correct choice for any 4–8 cylinder build involving a DBW throttle body or a traction control strategy — provided peak-and-hold (low-impedance) injectors are not required. Like all G4X wire-in ECUs, the XtremeX supports high-impedance (saturated) injectors only.
Technical Specifications
| Property | Value |
|---|---|
| SKU | 109-4000 |
| Platform | G4X |
| Connectors | Two × 34-pin AMP Superseal waterproof — Connector A (TKA kit) + Connector B (TKB kit), sold separately |
| Injection drives | 8 (high-impedance / saturated injectors only — NOT peak-and-hold) |
| Ignition drivers | 8 |
| Auxiliary outputs | 10 |
| Analogue voltage inputs | 11 |
| Analogue temperature inputs | 4 |
| Digital inputs | 8 (10 when CAN bus 2 unused) |
| Trigger inputs | 2 |
| Knock inputs | 2 |
| Sensor power supply | +5 V and +8 V |
| E-throttle / DBW | 1 channel (gear-shift throttle blip supported) |
| CAN bus | 2 |
| Serial (RS232) | 1 |
| USB tuning port | 1 (PCLink) |
| 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 | 185 × 130 × 40 mm |
| Weight | 680 g |
| 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 |
| VVT cam control | Up to 4 cams, independent closed-loop |
| Odd-fire engines | Supported |
| 2-stroke engines | Supported |
What You Can Do With It
- Control drive-by-wire throttle bodies with gear-shift throttle blip — full pedal-to-throttle management on DBW-equipped engines and conversions
- Configure wheel-slip-based traction control using CAN wheel speed data from a dash or PDM on either CAN bus
- Enable cruise control for endurance racing or road use
- Run full sequential injection and COP ignition on any 4–8 cylinder engine
- Map up to 4 independent closed-loop VVT cams
- Monitor and correct knock on two independent channels without external knock amplifiers
- Distribute CAN data across two separate buses — dash on CAN 1, PDM or transmission controller on CAN 2
- Log up to 250 channels at 1 kHz across 512 MB internal storage
- Use PCLink Maths Blocks for algebraic custom control strategies without custom firmware
Note on Injector Compatibility
The G4X XtremeX supports high-impedance (saturated, ≥8 Ω) injectors only. Low-impedance (peak-and-hold, 2–3 Ω) injectors — used in some high-flow motorsport injector series — are not compatible with any G4X wire-in ECU. For peak-and-hold injection drive requirements, Link’s G4+ Xtreme Black is the applicable product. Most modern injectors from Bosch EV14, Siemens/VDO, Injector Dynamics, and RC Engineering are high-impedance type.
G4X Family Comparison
| Model | Inj | Ign | Aux | Analog In | CAN | Key additional features |
|---|---|---|---|---|---|---|
| AtomX | 4 | 4 | 4 | 3 | 1 | Open-loop boost, knock |
| MonsoonX | 4 | 4 | 6 | 4 | 1 | + VVT (2 cams), closed-loop boost, launch, anti-lag |
| StormX | 8 | 8 | 8 | 8 | 1 | + Stepper idle, gear shift, trigger oscilloscope, 4-cam VVT |
| XtremeX | 8 | 8 | 10 | 11 | 2 | + E-throttle, traction control, cruise control, 2× CAN |
| FuryX | 8 | 6 | 10 | 9 | 2 | + Onboard wideband lambda (6 ign max) |
All G4X models share the same microcontroller and PCLink software. No separate licence tiers.
Required Accessories
- LinkECU Connector A Kit — TKA 34-pin AMP Superseal connector kit
- LinkECU Connector B Kit — TKB 34-pin AMP Superseal connector kit
Recommended accessories:
- LinkECU CAN Lambda Controller — LSU 4.9 wideband via CAN; no onboard wideband on XtremeX
- LinkECU Knock Sensor with Loom (KNSB) — wideband piezo knock sensor
Frequently Asked Questions
Does the G4X XtremeX support peak-and-hold (low-impedance) injectors?
No. The XtremeX, like all G4X wire-in ECUs, has saturated (high-impedance) injection drives only. Low-impedance (2–3 Ω) peak-and-hold injectors are not compatible. For peak-and-hold requirements, Link’s G4+ Xtreme Black is the relevant product.
What does the XtremeX add over the StormX?
Three additions: drive-by-wire E-throttle with gear-shift throttle blip, wheel-slip traction control, and cruise control. The XtremeX also provides 4 more analogue inputs (11 vs 7 on the StormX) and a second CAN bus — useful for complex builds running a dash, wideband, PDM, and gearbox controller simultaneously.
Should I choose the XtremeX or the FuryX?
For 7- or 8-cylinder sequential ignition, the XtremeX is the only G4X option — the FuryX is limited to 6 ignition outputs. For 6 cylinders or fewer with no external wideband, the FuryX’s built-in Bosch LSU 4.9 eliminates a separate controller. If you already have an external wideband, the XtremeX is €200 less and adds 2 more analogue inputs.
Is PCLink included or an additional purchase?
PCLink is a free download from linkecu.com with free updates. It is the same software used across every G4X ECU — the ECU firmware determines which feature tabs are active. No annual licence fee.
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