Every Sea-Doo with a Rotax 4-TEC or ACE engine is controlled by one of three ECUs, and which one you have decides how the file is read and what can be done with it. This short guide shows which controller is fitted to which model, what we supply for Sea-Doo and how to order.
Key facts
- ECUs: Bosch ME17.8.5 (47 software versions in our database), Continental MSE3.7 (9), Bosch MG1CA920 (1).
- Models: RXP-X, RXT-X, GTX, GTI, GTR, Spark, Wake and more.
- Solutions: Stage 1, RPM limit increase, Vmax (top speed limiter), DTC off; Stage 2 on selected models.
- Stage 1 example: RXP-X 1.6 supercharged 300 → 330 hp.
Which ECU is in your Sea-Doo
| ECU | Fitted to | Software versions |
|---|---|---|
| Bosch ME17.8.5 | RXT-X, RXP-X, GTI, Spark, Wake and other Rotax ACE models | 47 |
| Continental MSE3.7 | Earlier 4-TEC models: GTI, RXT-X, GTX, RXP-X | 9 |
| Bosch MG1CA920 | Latest RXP-X | 1 |
By model, our Sea-Doo solutions page lists 17 software versions for the RXT-X, 14 for the GTI, 13 for the RXP-X and 8 for the Spark, each with its software ID, so you can check your file before you start. The same Bosch ME17.8.5 family also runs Can-Am Maverick X3 and Ski-Doo engines.
What we supply for Sea-Doo
- Stage 1: fuel, ignition and, on supercharged models, load limits optimised for the stock engine.
- Vmax: the factory top speed limiter removed or raised. On supercharged models, this often makes the biggest difference on the water.
- RPM limit: raised within the safe range, typically after an impeller change.
- DTC off: single fault codes switched off cleanly.
- Stage 2: for intake, exhaust or supercharger upgrades, on selected models.
Stage 1 figures
| Model | Stock → Stage 1 |
|---|---|
| RXP-X 1.6 supercharged (RS) | 300–325 → 330–350 hp |
| RXT-X 1.6 supercharged | 300 → 325 hp |
| GTX 1.6 supercharged | 300 → 325 hp |
All Sea-Doo models and engines are listed in the Sea-Doo tuning catalogue.
How to order a Sea-Doo file
- Log in at fs.auto-remap.com or create a workshop account.
- Pick the Sea-Doo model and upload the full original read.
- Tick Stage 1, Vmax, RPM limit or DTC off.
- Receive the file, checksum corrected and ready to flash.
File service for professional tuners and marine workshops.
FAQ
Can the Sea-Doo top speed limiter be removed?
Yes. The Vmax option removes or raises it, on its own or with Stage 1.
Which Sea-Doo ECUs do you support?
Bosch ME17.8.5, Continental MSE3.7 and Bosch MG1CA920: every current and recent Rotax-powered Sea-Doo.
Can the jet ski go back to stock?
Yes. Keep the original read: it can be written back at any time.
Power figures are catalogue values for stock engines. Speed limiter modifications are supplied for racing and private use only, where permitted. It is the customer's responsibility to comply with local legislation and navigation rules.