Marine Outboard & Sterndrive

Mercury Outboard & Sterndrive Remap

Verado, Optimax, FourStroke & 350 MAG sterndrive Stage 1 calibration. Mobile to your marina.

Book Mobile Marine Service Call 01202 503 328

Mercury's Verado, Optimax and FourStroke ranges, plus the classic 350 MAG petrol sterndrive, power a huge share of the RIBs, ski boats and day boats moored across Poole Harbour and Southampton Water. Factory maps are set conservatively for global markets and fuel quality tolerance. 24Tuning delivers custom Stage 1 remapping across the Mercury range — mobile to your marina or boatyard.

Why Remap a Mercury Outboard or Sterndrive?

Mercury's factory calibration is built for the broadest global fuel and climate envelope rather than your specific boat and use case. A Stage 1 remap sharpens throttle response and recovers usable power within safe factory tolerances.

  • Stronger hole shot and quicker planing
  • Sharper, more direct throttle response
  • Improved mid-range for towing and watersports
  • No hardware required for Stage 1
  • Fully reversible with original map restore

Mercury outboard and sterndrive ECUs vary considerably by model year and market specification. Rather than quoting generic Alientech database coverage, we confirm compatibility on enquiry — send us your model, horsepower and serial number and we’ll confirm tooling access and turnaround before you book.

Mercury Engines We Cover

Coverage spans supercharged Verado outboards through to the classic 350 MAG sterndrive:

Verado (Supercharged & V-Series)

  • Verado 250
  • Verado 300
  • Verado 350
  • Verado 400
  • Verado V10 400
  • Verado V10 450
  • Verado V12 500
  • Verado V12 600

Optimax (DFI Two-Stroke)

  • Optimax 200
  • Optimax 225
  • Optimax 250

FourStroke

  • FourStroke 115
  • FourStroke 150
  • FourStroke 175
  • FourStroke 200
  • FourStroke 225
  • FourStroke 250
  • FourStroke 300

Sterndrive

  • MerCruiser 350 MAG

Estimated Stage 1 Gains

Engine / ModelStockStage 1 (est.)GainNotes
Verado V12 600600 HP~632 HP+~32 HPStage 1 software
Verado 400400 HP~425 HP+~25 HPStage 1 software
FourStroke 300300 HP~318 HP+~18 HPStage 1 software
Optimax 250250 HP~266 HP+~16 HPStage 1 software
MerCruiser 350 MAG (sterndrive)350 HP~372 HP+~22 HPStage 1 software

Figures are conservative estimates based on typical Stage 1 marine calibrations. Exact gains depend on engine condition, propeller, load and use case. Torque figures of 0 Nm from source databases are omitted.

24Tuning mobile marine engineer working on a Mercury outboard at a Dorset boatyard
Mobile marina service — diagnostics, factory backup and Stage 1 write on-site.

Mobile Marina Process

We come to your marina, slipway, dry stack or private berth across Poole Harbour, Bournemouth, Southampton Water, Lymington, Hamble and the wider Dorset & Hampshire coast.

  1. Quote & compatibility — share engine model, year and ECU details
  2. £50 booking deposit — confirm berth access and tide window
  3. On-site diagnostics — full health check before any write
  4. Factory map backup — secure original file for full reversion
  5. Custom Stage 1 calibration — in-house map for your use case
  6. Sea trial verification — where conditions allow
Book Mobile ServiceECU Testing & Repairs

What You’ll Notice on the Water

  • Quicker hole shot and planing transition
  • Sharper throttle connection at the helm
  • Stronger mid-range for towing and watersports
  • Compatibility confirmed on enquiry before booking

Key Benefits

  • Verado, Optimax & FourStroke
  • 350 MAG Sterndrive Coverage
  • Mobile Marina Visits
  • Factory ECU Backup
  • Lifetime Software Warranty
  • Compatibility Confirmed on Enquiry
  • Sea Trial Verification
  • Poole & Bournemouth Coast

Pricing

Mercury Stage 1 remapping from £799 including diagnostics, factory backup, custom calibration and on-board installation. Because ECU coverage varies by model year, we confirm compatibility on enquiry — contact us with your model and serial number. Secure with a £50 deposit via online booking.

Related Services

Frequently Asked Questions

Do you have Mercury on an Alientech database?

Mercury outboard and sterndrive coverage varies significantly by ECU and model year, so we confirm compatibility on enquiry rather than quoting from a generic database listing. Send us your Verado, Optimax, FourStroke or 350 MAG model and serial number and we will confirm turnaround before you book.

Do you remap the 350 MAG sterndrive as well as outboards?

Yes. The classic MerCruiser 350 MAG petrol sterndrive is a popular platform for Stage 1 calibration on ski boats and cruisers across the South Coast.

Do you work on-board at the marina?

Yes. Most Mercury remaps are completed on-board at your marina, boatyard or trailer across Poole Harbour, Bournemouth and Southampton Water.

Can the remap be reversed?

Yes. We back up your original factory ECU map before any changes and can restore it at any time, returning the engine to completely stock settings.

Mercury Remapping on the Dorset & Hampshire Coast

From supercharged Verado offshore rigs to 350 MAG-powered ski boats, Mercury powers a huge share of the fleet across Poole Harbour and Bournemouth Bay. 24Tuning provides mobile Stage 1 calibration with factory backup and lifetime software warranty.

Book a marina visit or send your engine details for a confirmed quote — we’ll verify compatibility before you commit.

Ready to Unlock Your Mercury?

Send your model and serial number for a free compatibility check.

Book Mobile Remap Get a Quote