McLaren 720S ECU Tuning Guide | Stage 1 & Stage 2 Power Gains & Process | Complete Guide 2026
The McLaren 720S runs the M840T 4.0-litre twin-turbo V8 — McLaren's most potent engine in the Super Series lineup. With 710 HP and 770 Nm from the factory, the M840T is already a powerhouse, but its twin-scroll turbochargers and Bosch Motronic MED 17.3.5 ECU leave substantial headroom for professional calibration. YPG Motorsport's bench tuning service unlocks up to 870 HP and 976 Nm at Stage 2, making the 720S one of the most rewarding exotics to tune in the GCC.
McLaren 720S Engine Breakdown — M840T 4.0T V8
| Spec | Detail |
|---|---|
| Engine Code | M840T |
| Displacement | 3,994 cc (4.0L) |
| Configuration | 90° V8, Flat-Plane Crank |
| Forced Induction | Twin-Scroll Twin Turbochargers |
| Compression Ratio | 8.7:1 |
| Stock Power | 710 HP @ 7,250 RPM |
| Stock Torque | 770 Nm @ 5,500 RPM |
| Redline | 8,500 RPM |
| ECU | Bosch Motronic MED 17.3.5 |
| Years | 2017–2022 |
Stage 1 — YPG ECU Calibration
Stage 1 recalibrates the M840T's boost targets, ignition maps and torque limiters while staying within the factory hardware's safe operating envelope. No exhaust or hardware modifications required — this is a pure software calibration for owners who want meaningful gains without touching a bolt.
| Spec | Stock | YPG Stage 1 | Gain |
|---|---|---|---|
| Power | 710 HP | 780 HP | +70 HP |
| Torque | 770 Nm | 850 Nm | +80 Nm |
Pricing: YPG Stage 1 ECU Tune — $2,999
Stage 2 — YPG Bench ECU Tune
Stage 2 is designed for 720S owners running catless downpipes or high-flow cat bypass pipes. With reduced backpressure, the ECU can safely target higher boost levels, optimised air-fuel ratios and removed torque limiters across all gears. The result is supercar-killing power from a car that already sits at the top of its class.
| Spec | Stock | YPG Stage 2 | Gain |
|---|---|---|---|
| Power | 710 HP | 870 HP | +160 HP |
| Torque | 770 Nm | 976 Nm | +206 Nm |
Pricing: YPG Stage 2 ECU Tune — $4,000
Recommended Products for McLaren 720S
The M840T Engine — McLaren's Twin-Turbo V8
The M840T is a clean-sheet design by McLaren's Woking powertrain team — not shared with any other manufacturer. It uses a 90-degree bank angle, flat-plane crankshaft, dry-sump lubrication and twin-scroll turbochargers mounted in the valley between the cylinder banks for the shortest possible exhaust path. The result is a 4.0-litre V8 that weighs just 198 kg dry — lighter than many 2.0-litre four-cylinder engines.
The M840T's responsiveness at high RPM is what separates it from competing twin-turbo V8s. Where the Mercedes-AMG M177 and Ferrari F154 rely on conventional turbo placement, McLaren's hot-inside-vee layout and 8,500 RPM redline give the 720S a throttle response that rivals naturally aspirated engines. This architecture also makes it exceptionally responsive to ECU tuning — small calibration changes translate directly into large, linear power gains with no lag penalty.
How the YPG Bench Tuning Process Works
- Ship Your ECU — The Bosch MED 17.3.5 ECU is located in the 720S's electronic bay. Remove it (or have your local McLaren-experienced shop handle removal) and ship it to YPG Motorsport via insured courier. We provide full removal instructions and prepaid shipping labels for GCC customers.
- Bench Read & Custom Map — We read the ECU on our bench, verify the current software version, and build a custom Stage 1 or Stage 2 calibration tailored to your hardware setup (stock, downpipes only, full exhaust, etc.).
- Flash & Return — The tuned ECU is flashed with your custom map and shipped back via DHL/Aramex. Typical turnaround: 3–5 business days from receipt.
- Install & Drive — Reinstall the ECU and drive. No dealer visit, no coding session, no OBD connection needed.
Remote tuning available for select configurations — contact us on WhatsApp to confirm eligibility.
Post-Install ECU Guidance — After Your Flash
Once your YPG or DME bench tune is flashed and re-installed, follow these steps to ensure the M840T ECU adapts correctly and your 720S delivers its full tuned output safely:
| Step | Action | Detail |
|---|---|---|
| 1 | ECU Adaptation Reset | After re-installing the bench-tuned Bosch MED 17.3.5, disconnect the battery for 15 minutes before first start. This clears the factory adaptation values so the M840T re-learns throttle position, fuel trims and SSG dual-clutch shift points from the new calibration — not the old map's learned behaviour. |
| 2 | First 50 km — Gentle Driving | Drive normally for the first 50 km in Comfort or Sport mode. The ECU needs 2–3 drive cycles to fully adapt fuel trims, boost targets and dual-clutch shift logic. Avoid Track mode, launch control or full-throttle pulls during this period. You'll feel the car getting progressively sharper as adaptation completes. |
| 3 | Fuel — 98 RON Minimum | Run 98 RON (93 octane US) or higher on all YPG and DME calibrations. RON 95 maps are available for GCC customers on request — contact YPG before flashing if your fuel station only stocks 95. The M840T's increased boost targets at Stage 1 and Stage 2 rely on knock resistance from high-octane fuel. |
| 4 | Check for Fault Codes | After the adaptation period, scan for fault codes with a McLaren-compatible OBD2 reader. A clean scan confirms the tune is running correctly. If any codes appear during the first drive cycle, clear them once — they should not return after full adaptation. If they persist, contact YPG immediately. |
| 5 | Monitor Coolant & Oil Temps | The M840T runs a primary coolant temp of ~85–90°C and oil temp of ~105–115°C under normal driving. If coolant exceeds 105°C or oil exceeds 130°C under sustained track use, back off and allow temps to stabilise. Stage 2 cars with catless downpipes may see slightly lower exhaust gas temps due to reduced backpressure — this is normal and expected. |
| 6 | Dealer & Warranty Visits | YPG stores your stock ECU file. Before any dealer service, warranty inspection or recall work, contact us for a free reversion to factory calibration. We re-flash your ECU after the visit at no charge. McLaren dealers use the McLaren Diagnostic System (MDS), which reads the ECU calibration — a stock reversion ensures a clean scan. |
Recommended Exhaust & Hardware Upgrades
Stage 1 works on a fully stock 720S. Stage 2 requires exhaust modifications to remove backpressure — here are the products we recommend and sell:
Downpipes & Cat Bypass
| Product | Type | Price |
|---|---|---|
| YPG Race Downpipes — Catless | Catless Race Downpipes | $2,999.99 |
| Fabspeed Cat Bypass Pipes | Catless Cat Bypass | $4,199 |
| Capristo 100-Cell Sport Cat Downpipes | High-Flow Sport Cats | $6,900 |
Exhaust Systems
| Product | Type | Price |
|---|---|---|
| Fabspeed Supersport LT Exhaust | Catback Exhaust | $3,395 |
| Novitec Exhaust System | Full Exhaust | $6,490 |
| Capristo Valved Exhaust + 250-Cell Sport Cats | Valved Full System | $13,200 |
| Capristo Valved Exhaust + Cat Delete | Valved Full System | $10,500 |
Accessories
| Product | Type | Price |
|---|---|---|
| Capristo Exhaust Tips | Styling | from $1,200 |
Tuning Pricing Summary
| Tune | Power Output | Price | Link |
|---|---|---|---|
| Stage 1 — YPG Bench Tune | 780 HP / 850 Nm | $2,999 | Order Stage 1 |
| Stage 2 — YPG Bench Tune | 870 HP / 976 Nm | $4,000 | Order Stage 2 |
| Stage 2 — DME Tuning | 870 HP / 976 Nm | $4,999 | Order DME Stage 2 |
Browse All McLaren 720S Products →
GCC Delivery & Regional Notes
YPG Motorsport is based in Kuwait and serves every GCC country: UAE, Saudi Arabia, Bahrain, Qatar and Oman. All ECU tuning services include insured DHL/Aramex shipping both ways. Gulf-region 720S models running RON 95 fuel receive a dedicated map optimised for that octane — no race fuel required. Cars on RON 98 or E85 blends receive a high-octane map for maximum safe gains.
Learn more about YPG Motorsport's ECU tuning services in your country:
Why YPG Motorsport for McLaren 720S Tuning
- M840T Experience — YPG Motorsport has tuned dozens of McLaren 720S M840T engines across the GCC. Our calibration data library for this platform is one of the deepest in the region.
- Bench Tuning, Not OBD Flash — Stage 1 and Stage 2 are true bench flashes. The ECU is removed, read and reprogrammed with a bespoke map — not a generic OBD flash that trips security protocols.
- World Record Holders — YPG Motorsport holds multiple GCC performance records across AMG, Ferrari and McLaren platforms.
- Full Ecosystem — We sell the exhaust hardware you need alongside the tune. Downpipes, cat bypass pipes, full systems — everything ships from one source with matched calibration.
- Reversible — We store your stock ECU file. Full factory reversion available at any time for dealer visits, warranty inspections or resale.
Frequently Asked Questions
How much horsepower does a Stage 2 tune add to a McLaren 720S?
What is the difference between Stage 1 and Stage 2 on a McLaren 720S?
Do I need to remove my McLaren 720S ECU for tuning?
Is McLaren 720S ECU tuning reversible?
Which downpipes should I get for Stage 2 on my 720S?
Can YPG Motorsport tune the McLaren 720S remotely?
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