PRX Preux Power
ECU Calibration & Development

Real calibration.
Not a canned file.

Remote tuning files, custom operating systems and bench-level ECU work for performance shops and owners who want the job done properly. Every file is written against your actual read — checksum-corrected, byte-verified, and backed by free revisions until it's right.

Submit a file Browse services
< 4hTypical turnaround
FreeRevisions, always
100%Checksum verified
24/7Ticketed support
PREUX POWER — E99 ECU flashing program
What we do

Built on the bench, not bought from a catalogue

We reverse-engineer the calibration and the operating system itself. That means we can change things a file service simply cannot reach.

⚡

Remote tuning files

Send us your read, get a finished file back. Stage 1 through fully custom builds, transmission calibration and fuel conversions — mapped to your vehicle's actual hardware, not a generic model match.

⚙

Custom operating systems

OS-level patches for GM E38, E90 and E99 controllers: VE table hooks, flex fuel enable, sparkcut, antilag and security bypass. Every address is resolved against your target OS, then the finished image is byte-verified.

🔒

Unlock & recovery

Locked modules read and written, bricked ECUs recovered at bootloader level, checksums repaired, VIN and immobiliser alignment. The work other shops send away.

📈

Definition & XDF work

Reverse-engineered TunerPro definitions for calibrations nobody has mapped. Addresses, scaling and axis data verified in the disassembler before they reach your definition file.

🔧

Shop & dealer support

Trade pricing, priority queue and a direct line to an engineer. Take on work you'd otherwise turn away, without hiring a calibrator.

💬

Support that answers

Every job carries a ticket thread. Attach datalogs, ask questions, request revisions — all tracked in one place, with a real engineer on the other end.

How it works

Four steps, one portal

No email chains, no lost files, no wondering where your job is. Everything runs through your account.

Create your account

Read the ECU

Pull the original file with your tool of choice — bench, boot or OBD. We work with reads from every mainstream flashing platform.

Submit through the portal

Upload the read with your vehicle details, hardware list and what you want from it. Takes about two minutes.

We calibrate it

An engineer works your file by hand, corrects the checksum, and verifies the image before delivery. Typical turnaround is under four hours.

Flash and refine

Download, flash, drive. Send a datalog back and we'll revise it — free, for as long as the vehicle needs it.

Popular services

Priced up front

Full price list
Performance

Stage 1 Performance Remap

Software-only calibration on an otherwise stock vehicle. Ignition, fuelling, boost and torque limiters optimised for pump fuel.

$150 · 3 credits
Performance

Stage 2 Performance Remap

For vehicles with bolt-on hardware — intake, exhaust, downpipe or intercooler. Recalibrated around your actual airflow.

$200 · 4 credits
Performance

Stage 3 / Custom Build

Fully custom calibration for built engines. Datalog-driven, revised as many times as the build needs.

$325 · 6 credits
Performance

E85 / Flex Fuel Conversion

Full ethanol content compensation — fuel scaling, spark tables and cold start. Sensor-based flex or fixed blend.

$200 · 4 credits
Performance

Speed Density / MAF-less

Convert to a volumetric efficiency airflow model. Required for large cams, forced induction and MAF-limited setups.

$275 · 5 credits
Performance

Cam Swap Calibration

VE re-model, idle stabilisation and torque table correction for aftermarket camshafts.

$275 · 5 credits
For shops & dealers

Add tuning to your shop without hiring a calibrator

Run the install and the dyno; we handle the calibration. Trade pricing, priority queue, and your customers never see our name unless you want them to.

  • ✓ Volume credit pricing that drops as you grow
  • ✓ Priority queue ahead of retail submissions
  • ✓ White-label delivery — your branding, your customer
  • ✓ Direct engineer contact, not a support queue
Dealer programme
30%Off at dealer volume
PriorityQueue position
UnlimitedFree revisions
Ready when you are

Send us a file

Create an account, upload your read, and get a calibrated file back the same day. Not sure what you need? Open a ticket and ask — that's free too.

Get started Talk to an engineer