Porsche Cayenne Turbo S 4.8 TT V8 ECU Tuning – Optimized Performance | 955 2008–2009

This isn't a generic flash. Our Cayenne Turbo S 4.8 twin-turbo V8 calibrations are developed in-house, optimized on the dyno, and tested on the street and track. Every map is built around your fuel, your hardware and how you actually drive the vehicle — maximum power with factory-level refinement and reliability.

Estimated on a healthy vehicle with known-good fuel:

• 550 hp → 625 hp — estimated gain of +75 hp
• 553 lb-ft → 650 lb-ft — estimated gain of +97 lb-ft
• Fuel maps available for 91, 93 and 100 octane
• Adjustable throttle response and boost timing
• Calibrated for consistent performance in all conditions

The 955 Cayenne Turbo S runs the uprated 4.8L twin-turbocharged V8. Porsche already leaned on this engine harder than the standard Turbo, but the factory calibration still carries a wide safety margin for global fuel quality, towing and extreme ambient temperatures. Recalibrated for the fuel you actually run, the Turbo S makes its torque earlier and holds it further — which on a vehicle this heavy is the change you feel most.

What's included:

• Custom ECU calibration developed around your fuel, hardware and driving preference
• Optimized boost, ignition timing and fuelling for your specific vehicle
• Throttle response and drivability refinement
• Fuel map matched to the octane you actually run — 91, 93 or 100
• OBDII data cable shipped to you
• Same-day file turnaround once we have your stock read

What we need from you:

• Your factory stock file, read with the cable we send you
• A complete list of current modifications
• Vehicle details and VIN
• An honest description of the vehicle's mechanical condition and service history
• The octane you run day to day

Supported Vehicles:

• Porsche Cayenne Turbo S (955) — 4.8L twin-turbocharged V8, 2008–2009

How to order:

• 1. Order online. We ship you an OBDII data cable — typically 2–3 days to arrive.
• 2. Read your stock file. Plug the cable into your OBD port, upload your factory file, then email it to us with a list of your current modifications.
• 3. Get your file back the same day. We email your custom calibration back the day we receive your stock read — and we'll make sure you're happy with it.

In the Southern California area? Get in touch and we can tune your vehicle in person instead.

Before you order:

• Power figures are estimates, not guarantees. Results vary with fuel quality, altitude, ambient temperature, mechanical condition, supporting modifications and dyno methodology.
• Mechanical condition — tuning raises cylinder pressure and driveline load. The vehicle must be sound first. Pre-existing faults revealed or accelerated by tuning are not our responsibility.
• Accurate information required — we build the file from what you tell us. An unmodified stock read and an honest description of the vehicle, its modifications and its condition are required.
• Warranty — an ECU modification will likely void any remaining factory powertrain warranty.
• Legal use — certain calibrations are for off-road and competition use only. Compliance with federal, state and local emissions law is the buyer's responsibility.
• Risk and liability — the customer assumes the risk of modification. Our liability is limited to the price of the tuning service.

Note: Tuning services are non-refundable once the file has been delivered. The service is complete at delivery. Full terms are on our Terms of Service page.

Questions about your specific vehicle? Get in touch — we're happy to confirm the right calibration before you order.

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