Vmax off and speed limiter removal
Most modern cars leave the factory with a top speed written into the engine calibration — commonly 250 km/h on German performance models, and lower on many vans and economy engines. Vmax off takes that ceiling out of the software, so a car prepared for the track is limited by its gearing, power and aerodynamics rather than by a number stored in the control unit.
For professional and motorsport use where permitted by local law. Removing or disabling emissions equipment on a vehicle used on public roads is not permitted in most countries — check the rules that apply to you before ordering.
- Vmax off applied to your own ECU read
- Checksum-corrected and flash-ready
- Combine with Stage 1, launch control or an RPM limiter change
- About a minute, from €49.95
What a speed limiter actually is
There is no separate device. The limiter is a rule inside the engine calibration: when the vehicle-speed signal reaches a stored threshold, the control unit reduces torque — by closing the throttle, trimming fuel or retarding ignition — until the speed drops back under it. Vmax off, speed limiter removal, top speed delimit and Vmax delete all describe changing that rule.
It is a limit, not a power setting. Removing it does not make the engine any stronger; a car that was electronically held at 250 km/h will only go faster if it has the power and the gearing to do so. On cars where it does, the limit is the reason they stop accelerating — which is exactly why it matters on a circuit with a long straight.
On some automatic gearboxes the transmission controller carries a speed limit of its own, separate from the engine calibration. That is a different control unit and a different file.
Speed limiter, rev limiter and launch control
Three different limits get confused here, and they are three different options in the catalogue. The speed limiter caps how fast the car travels. The RPM limiter caps how fast the engine turns, whatever the road speed. Launch control holds the engine at a set speed while the car is stationary, so a standing start begins from the right point in the rev range.
They are often ordered together on a track build, and they can all go into the same file. Choosing one does not change the others.
- Vmax — vehicle speed ceiling
- RPM limiter — engine speed ceiling
- Launch control — held engine speed for standing starts
Before you remove it
A higher top speed asks more of everything that was chosen for the old one. Tyres carry a speed rating, and a tyre rated below the speed the car can now reach is the first thing to change. Brakes, cooling and aerodynamic stability at the new speed belong in the same conversation.
Some vehicles are required by law to carry a speed limiter — heavy goods vehicles and buses in much of Europe among them. Those are outside what this service is for.
How it works at StageGen
You send the read from your own control unit and the change is made to that file. What comes back is your calibration with the limit changed and every checksum recalculated, ready to write with the tool you used to read it.
- Upload the original read from your control unit
- Tick Vmax, plus anything else the build needs
- Download the checksum-corrected file and flash it
Which control units are covered
The platform covers the control units that make up the bulk of the European parc, petrol and diesel alike.
- Bosch EDC15, EDC16, EDC17 (including C74 and C76)
- Bosch ME7, MED9, MED17, MEVD17, MG1 and MD1
- Siemens/Continental SID, SIMOS, MSD and PCR families
- Delphi DCM, Marelli MJD and IAW, Denso
If the read came from a slave tool
A slave read is encrypted, and no change can be applied to it in that state. The usual route is through your master tuner: they decrypt the read, you upload the decrypted file here, and the tuned file goes back to them to be encrypted for your device. A master read — .bin, .ori, .mpc and the other common formats — uploads directly.
Turnaround and pricing
A file tuning job is €49.95, and Vmax off can share that file with the other options you pick. Processing is automatic and runs around the clock, so most files come back in under a minute.
If a read cannot be matched automatically, you can request manual processing instead and it is handled by hand.
Frequently asked questions
Related
- Stage 1 remap More power and torque — the change that makes a higher top speed reachable.
- Pops and bangs Crackle on overrun, another common addition to a petrol track file.
- DTC off Stop specific fault codes being set for components a build has removed.
- File services Every service on the platform, with what each one changes.