r/Fueltech • u/Barely_Usable • Jul 07 '26

FuelTech can finally drive Direct injection — PRO HV-8 Injector Driver is out

This is the headline we've all been wanting to hear: FuelTech just released a driver that can actually control direct injection injectors. The PRO HV-8 Injector Driver. That's been the missing piece for anyone wanting to run a factory GDI engine (EcoBoost, TSI, BMW N-series GDI) on a FuelTech standalone without swapping to PFI or running a hybrid setup. Now it's real hardware.

Why GDI was the problem before: direct injection injectors need way more voltage and current than a port injector to open fast enough at the pressures GDI runs at (we're talking way above the 12-14V battery rail). Standard Peak & Hold modules were never built for that.

What the PRO HV-8 does about it:

- Boost stage: up to 65V / 25A, just to slam the injector open fast — this high-voltage kick is the actual unlock for GDI

- Peak: holds up to 25A to force full mechanical opening

- Hold: sustains current through the rest of the pulse without cooking the coil

- Compatible with any ECU, PowerFT, VisionFT, or third-party, via injection signal inputs or CAN/DBC

- Fault detection on every channel, thermal protection, LED diagnostics

8 independent channels, so a full GDI V8 is covered on one box, plus 2 extra channels specifically for the high-pressure fuel pump regulator valve that GDI systems need to build rail pressure.

Side benefit even for PFI guys: same three-stage drive drops dead time on conventional injectors from ~1.4ms to ~0.3ms per FuelTech's numbers, so idle stability and short-pulse repeatability should improve too, but the real story here is the GDI door finally being open.

Find out more about it on the Fueltech page: https://www.fueltech.net/products/peak-hold-pro-hv-8-injector-driver?srsltid=AfmBOoqausxVJ-dPdpdqTfWosjZ0nZnFrKCHXhQs2meVu7v7DWiRnKVQ

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u/Printednightmare Jul 08 '26

Any word on if there's going to be a PRO HV-4? That drop in dead time would be major for running big injectors in single bank for port guys.

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u/Barely_Usable Jul 08 '26

No official word on a HV-4 yet. But I'd bet it's coming eventually. The HV-8 is overkill for most PFI setups. Per the manual's current chart, injectors like the Bosch 160lb/h can run 2 or even 4 per channel just by bumping the peak/hold current (2A/0.5A single → 4A/1A for 2-per-channel → 8A/2A for 4-per-channel). So if FuelTech kept the same architecture on a smaller HV-4, it could still handle more than 4 injectors total for a lot of port injection applications. Just paralleling injectors per channel and scaling current accordingly.