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Stage kits · ECU · TCU

Stage 1.
Stage 2.
Stage 3.

A stage is not a power number. It is how much hardware the calibration has to work with. Here is what changes at each step, what it costs you in install time, and where the factory turbo stops being the limit.

Shop stage kitsOur dyno logs
Measured, not estimated

Where each stage makes its power

Wheel horsepower against engine speed. Same car, same day, 93 octane, 28 °C ambient — stock pull first, each stage layered on top.

200 300 400 500 600 700 2,000 3,000 4,000 5,000 6,000 7,000 WHP RPM
Stock · factory map Stage 1 · ECU only Stage 2 · ECU + hardware Stage 3 · turbo + fuelling
The three steps

What actually changes

Stage 01 40 min

Software only

+68 whp / +81 lb-ft

Boost, fuel, spark and throttle response recalibrated inside the factory hardware's headroom. No parts, no downtime, fully reversible.

Hardware required Stock airbox and exhaust retained OBD flash, no disassembly TCU file recommended on DSG cars
Fuel · 93 octane pump Legality · Emissions equipment untouched Stock map · stored to VIN, reversible
Shop Stage 1
Stage 02 2.5 h

Air and heat

+118 whp / +142 lb-ft

The calibration runs out of air before it runs out of turbo. Downpipe, intake and charge cooling let the stock turbo hold target boost to redline.

Hardware required High-flow 200-cell downpipe Sealed carbon intake Upgraded charge cooler or intercooler
Fuel · 93 octane · E30 optional Legality · OPF-back road legal · catless track only Stock map · stored to VIN, reversible
Shop Stage 2
Stage 03 14–20 h

New limit

+240 whp / +260 lb-ft

Upgraded turbocharger and the fuel system to feed it. The file is built around your hardware and logged on the car — never pulled off a shelf.

Hardware required Upgraded turbo or hybrid cartridge HPFP, injectors, port injection or E85 TCU and clutch calibration
Fuel · E85 or race fuel Legality · Typically track only Stock map · stored to VIN, reversible
Book a Stage 3 build
Side by side

Stage comparison

Metric Stage 1 Stage 2 Stage 3
Typical gain +68 whp +118 whp +240 whp
Peak boost 20 psi 22 psi 28 psi
Hardware None Downpipe · intake · cooling Turbo · fuelling · cooling
Install time 40 min 2.5 h 14–20 h
Fuel 93 octane 93 / E30 E85 or race
Gearbox file Recommended Recommended Required
Calibration Off-the-shelf Off-the-shelf Custom, logged per car
Road legal Yes OPF-back only Track only
Return to stock Unlimited Unlimited Unlimited (file only)
In detail

What is different about the car

The same six questions asked of each stage: what the file touches, what you have to buy, how it drives, what it costs you in servicing, who it suits, and where it stops.

Stage 01

Software only

The factory calibration is written for the worst fuel, the hottest day and the least maintained example of your car anywhere it is sold. Stage 1 spends the margin that was left in it, and nothing else changes.

Typical gain +68 whp / +81 lb-ft
Peak boost 20 psi, from 18
Time on the car 40 minutes, OBD
Fuel 93 octane pump
What the file changes
  • Boost target and the wastegate duty that holds it
  • Fuel and spark across the load range, to the knock margin the fuel allows
  • Torque limiters, which is where a surprising share of the gain comes from
  • Throttle mapping and pedal response
What you have to buy
  • Nothing. Stock airbox, stock downpipe, stock intercooler
  • A TCU file if the car is a DSG or a torque-converter automatic
How the car changes
  • Boost arrives 400-600 rpm earlier and the mid-range fills in
  • No change to sound: the exhaust and its silencers are untouched
  • Part-throttle feels sharper, which is throttle mapping rather than power
Servicing and reliability
  • Same service intervals. Use the oil grade the manufacturer specifies, not a heavier one
  • Spark plugs one heat range colder are worth doing at the next service
  • The stock map is stored against the VIN before the first write, and goes back on in twenty minutes
Who it is for
  • A daily car that has to pass an inspection and stay quiet in a car park
  • Anyone finding out what the platform responds to before spending on hardware
What it will not do
  • Hold boost to redline. The factory downpipe and intercooler are the limit, and both give up in the last 1,500 rpm
  • Survive being run on 87 octane. The file assumes the fuel it was written for
Stage 02

Air and heat

Stage 2 is not a bigger file. It is the same turbo asked to do the same job with the restrictions removed — a freer exhaust path, colder charge air, and a calibration written on the assumption that both are there.

Typical gain +118 whp / +142 lb-ft
Peak boost 22 psi, held to redline
Time on the car 2.5 hours on a lift
Fuel 93 octane, or E30 for more
What the file changes
  • Everything Stage 1 does, recalculated for the lower backpressure
  • A flatter boost curve — the target is held rather than tapered off after peak
  • Charge-temperature compensation retuned around the larger cooler
  • Catalyst and OPF monitors adjusted to the hardware actually fitted
What you have to buy
  • A high-flow downpipe. Fit this first — it returns more than any other single part
  • A sealed intake, so the filter is drawing outside air and not bay heat
  • An upgraded charge cooler or intercooler, which is what makes the gain repeatable
How the car changes
  • The top end stops falling away; the last 1,500 rpm is where the gain lives
  • Audibly louder and deeper, and on a catless downpipe considerably so
  • A second and third pull make the same power as the first, which is the real point
Servicing and reliability
  • Colder plugs are no longer optional, and the gap wants closing
  • Oil and gearbox service intervals come forward if the car sees track time
  • A 200-cell catalyst keeps the monitors happy; an empty pipe will not set them
Who it is for
  • A car that sees a back road or a track day and has to repeat the performance
  • Anyone whose Stage 1 car goes soft after two hard pulls
What it will not do
  • Keep a catless car legal. OPF-back is road legal; catless is closed-course only
  • Move the turbo past its efficiency island. That is the wall Stage 3 exists to move
Stage 03

New limit

Stage 1 and 2 work the factory turbo harder. Stage 3 replaces it, and then rebuilds everything downstream that was sized for the old one — fuel, cooling, clutch, and a calibration written against your car rather than your platform.

Typical gain +240 whp / +260 lb-ft
Peak boost 28 psi, hardware dependent
Time on the car 14-20 hours, plus dyno
Fuel E85 or race fuel
What the file changes
  • Written from scratch against your turbo, your fuelling and your logs
  • Boost control rebuilt around a compressor with a different response
  • Fuel model rescaled for the injectors and the ethanol content actually in the tank
  • Torque model and gearbox limits raised together, or the box will cut what you added
What you have to buy
  • An upgraded turbocharger or a hybrid cartridge
  • The fuel system to feed it: HPFP, injectors, port injection or an E85 conversion
  • A TCU file and, on a manual, a clutch that will hold the torque
  • Dyno time. This is not a file you post out
How the car changes
  • Boost arrives later and harder; the mid-range can be softer than Stage 2 by design
  • The powerband moves up, and so does the speed at which the car is interesting
  • Cold-start, idle and low-load driveability all need deliberate work, not just a peak number
Servicing and reliability
  • Treat it as a motorsport engine on a road registration: shorter oil intervals, and log everything
  • Ethanol is hard on fuel system components that were not chosen for it
  • Rods, bearings and the clutch become the next limit, and they should be planned for rather than discovered
Who it is for
  • A car built for a purpose — a class, a circuit, a number — rather than for the commute
  • Owners who will read a log and act on it
What it will not do
  • Stay road legal in most jurisdictions. Assume track only and be pleasantly surprised
  • Fix a tired engine. Compression and a leak-down test come before the order, not after
  • Express a build the factory ECU has no strategy for — that is where standalone management starts
Three layers, not one file

ECU · TCU · AWD

A modern high-performance car is calibrated across several control modules. Flashing the engine ECU alone leaves the gearbox and the driveline making factory decisions about the torque you just added.

ECU
Engine calibration

Boost targets, fuel, spark, torque limiters and throttle mapping. The layer everyone means when they say tune.

TCU
Transmission calibration

Clutch pressure, shift logic, launch behaviour and manual-mode hold. Without it a DSG or torque-converter box protects itself by cutting the torque you paid for.

AWD
Driveline and modules

Haldex or torque-split strategy, and on AMG platforms the CPC module — modern cars spread vehicle control across several units.

Beyond Stage 3

Off-the-shelf vs custom

Off-the-shelf

Your car has these modifications, so it takes this predefined calibration. Fast, proven, and correct for a standard Stage 1 or 2 configuration.

Custom / remote

Here is exactly what is installed; calibrate around this combination. The right answer once an unusual turbo, an ethanol blend or upgraded fueling stops fitting a stage map.

Standalone management

Not the next stage after Stage 3 — a different approach. Replaces the factory strategy for motorsport builds with non-factory sensors, custom boost control and full data logging.

Standalone engine management

Custom MaxxECU setups

Not the step after Stage 3 — the other direction. When a build stops being something the factory ECU has a strategy for, the answer is to replace the strategy rather than argue with it. We specify, wire, map and log MaxxECU installations in house.

A swapped engine, a turbo the factory model cannot describe, ethanol, individual throttle bodies, a sensor set nobody at the factory imagined: each of these is a reason the stock ECU starts guessing. MaxxECU runs the engine on tables we build from your hardware, on a loom we can account for pin by pin.

Scope a buildTalk to the fitment desk
What a build involves
Software MTune, Windows
Dash & logs MDash, phone or tablet
Harness Plug-in or built to fit
Bench time From 3 days
Revisions Remote, included
Legality Closed course
Why standalone

What a flash cannot reach

Every table, not the ones left unlocked

A flash edits what the factory strategy exposes. Standalone replaces the strategy, so fuel, ignition, boost and limits are yours from a blank sheet rather than borrowed from a map somebody else locked.

Sensors the factory never fitted

Flex fuel, fuel pressure, oil pressure and temperature, EGT per cylinder, wheel speed. A factory ECU has nowhere to put them; here they are inputs the calibration can act on.

Closed-loop boost that means it

Boost by gear, by ethanol content, by intake temperature, or on a rotary switch on the dash. Target and correction, not a duty-cycle table and a hope.

Motorsport strategies as standard

Launch control, flat shift, antilag and traction control are part of the platform rather than something a factory ECU has to be tricked into approximating.

Engine swaps stop being a wiring problem

A different engine in a different chassis has no factory calibration to inherit. Standalone is how that car runs properly instead of running at all.

Logging built for reading afterwards

High-rate internal logging in MTune, and live gauges on a tablet through MDash. Every change we make on the dyno is a log you keep.

Hardware

Choosing the tier

The engine decides the channel count and the rulebook decides the rest. We specify the tier against the build rather than selling up from it.

MaxxECU STREET Road builds

The entry into standalone management for a street car that has outgrown its factory ECU. Sequential fuel and ignition, closed-loop boost, and enough input for the sensors a road build actually runs.

MaxxECU SPORT Fast road · track days

More input and output than STREET, which is what a car with drive-by-wire, a second lambda and real traction control needs before the harness starts running out of pins.

MaxxECU PRO Six and eight cylinder

The tier most of our German builds land on: enough channels to run a V8 or a straight-six fully sequential with individual cylinder trim, and the I/O for a motorsport sensor set.

MaxxECU RACE Competition

For a car built to a class rather than to a road. Specify it when the rulebook, the data logging requirement or the sensor count decides the ECU rather than the engine does.

The build

Bench to handover

01
Scope the car

Engine, chassis, gearbox, fuel, and what the car is actually for. This decides the tier and the sensor list, and it is the conversation that stops a build being specified twice.

02
Harness

A plug-in adapter where one exists for the platform, and a built-to-fit loom where one does not. Motorsport-spec on request, labelled and documented either way.

03
Sensors and actuators

Wideband lambda, fuel and oil pressure, temperatures, trigger and cam sync verified on a scope before the engine is asked to start.

04
Base map and first start

Built in MTune from the engine's geometry and the injectors actually fitted, then cranked, timed and idled before it goes near a load cell.

05
Dyno and drivability

Power is the short part. Cold start, idle, transient fuelling and part throttle are what decide whether you can live with the car afterwards.

06
Logs and handover

You leave with the map, the logs, MTune on your laptop and a walkthrough of what to watch. Remote revisions afterwards are part of the build, not an extra.

Standalone management removes the factory emissions strategy and its diagnostics. A car running MaxxECU is a closed-course vehicle. We will say so on the quote, on the invoice and again at handover.

Calibration partners

Who we flash with

Different houses prioritise different things — staged files, drivability, gearbox logic, or full motorsport management. We match the tuner to the platform.

Tuner Strongest on Main strength
Jackal Motorsports Audi RS5 · RS7 Staged and fully custom Audi work, with AL552 TCU calibration in the same package
Integrated Engineering Golf R · MQB Clean staged path to big turbo, DSG files and TrueFlex ethanol blending
Weistec AMG C63 · M177 Deep M177 experience through to upgraded turbos and CPC module tuning
TuneZilla Custom / remote Calibration developed from your logs, hardware and fuel rather than a stage file
MaxxECU Motorsport builds Standalone engine management for builds past what the factory ECU can express
Buying guide

Choosing a stage for a German turbo platform

Stage 1 optimises the car you already own: boost, fuel, spark and throttle response inside the factory hardware's headroom. On an EA888.4 or a B58 that is worth +60 to +80 whp on pump fuel with nothing bolted on, which is why it is always the first flash and never the last.

Stage 2 is a hardware conversation

The calibration runs out of air before it runs out of turbo. A high-flow downpipe, a sealed intake and better charge cooling let the factory turbo hold its boost target to redline instead of bleeding it away as intake temperatures climb. Fit the downpipe first — it returns more than any other single part on a stock-turbo car.

Stage 3 changes the limit, not the map

A larger turbocharger and the fuel system to feed it. Past this point an off-the-shelf file stops being honest: the calibration has to be developed against your hardware, your fuel and your logs, and the gearbox needs its own file to hold the torque.

What we will not do

We do not sell a stage number without the hardware it assumes, and we do not quote a gain we have not logged on a car. Every figure on this page came off our own dyno, back to back, on the same day.