The first step in extracting power from the N55 engine requires no hardware changes, this is a software-only upgrade. The ECU software follows the linear torque delivery of the stock ECU tune through the low to mid-range, while adding a nice 50 lb/ft of torque across the entire curve. At higher rpm where the standard power curve starts to flatten off, we keep the power climbing, peaking an extra 50-60HP.

With our 'Stage' software upgrades the following features are included:

• Vmax Removal (Speed limiter removed)
• Sports Displays recalibrated to suit new outputs
• Enhanced overrun (Optional)

Expected Results, based on our Dyno Dynamics rolling Road:

365-385HP with 390-410LBFT

An additional step towards improving the exhaust flow of the stock turbocharger is the removal of the catalyst in the downpipe,  upon removal of the standard catalyst it is recommended to install a sports cat to retain MOT legality, or a full de-cat pipe can be utilised for optimal gains if the vehicle is to be for track use only. With the free-flowing downpipe installed fueling can be optimized and new lambda targets set, and boost levels and ignition timing can be optimised, taking into account the less restrictive exhaust system. Standard cat-back can be still retained, however, optimal results are based on a free-flowing turbo back system being fitted.

Low-end response is improved and turbo lag is reduced, torque curve will be held similar to stage 1 with an extra 10-20LBFT, and power at higher RPM will increase by 10-15hp.

With our 'Stage 1+' software upgrades the following features are included:

• Vmax Removal (Speed limiter removed)
• Sports Displays recalibrated to suit new outputs
• Enhanced overrun on Sports mode (optional)
• Cold start delete (removal of high/loud idle) (optional)
• Catalyst code removal to avoid EML lights

Expected Results, based on our Dyno Dynamics rolling Road:

390-410HP with 400-430 LBFT

The intercooler is the limiting factor when it comes to tuning the N55 Engine, with Intakes easily hitting 50-60+ degrees celsius on a single power run. To maximise the performance of the stock turbocharger we install an air-to-air intercooler with a much larger core and overall surface area, dramatically improving intake temperatures - instantly picking up horsepower and most importantly consistency, especially in the summer months when the standard intercooler will struggle, causing power to flatten off at higher RPM. With the intake cooling system improved ignition timing can be advanced gaining even more power.

With our 'Stage 2' software upgrades the following are included:

• Vmax Removal (Speed limiter removed)
• Sports Displays recalibrated to suit new outputs
• Enhanced overrun on Sports mode (optional)
• Cold start delete (removal of high/loud idle) (optional)
• Catalyst code removal to avoid EML lights

Expected Results, based on our Dyno Dynamics rolling Road:

400-420HP with 420-440LBFT (Limited)

The final hardware change for maximizing the standard turbochargers efficiency range, which allows us to ramp up the mid-range boost to gain optimal airflow is a fuel pump upgrade. The issue of the standard fuel system becomes clear if attempting to run much higher torque than 476-480lbft - the fuel pressure will drop - this can cause limp mode or worse engine damage from lack of fuel pressure. To resolve this and to run greater torque levels (with requires more fuel volume) an upgraded HPFP (High-Pressure Fuel Pump) is installed, this allows more fuel volume per engine revolution (crankshaft chain driven pump) thus allowing more fuel volume without pressure drop.

When upgrading the fuel pump there are a few options, and we advise you to think about the future plans if any - if planning to run over 550HP on pump fuel, or even with ethanol blends an aftermarket pump is recommended, otherwise for the base upgrade we use a 'TU' fuel pump from the later B58 models (Z4 / Supra) This is a great cost-effective upgrade with much larger fuel large scope range.

With our 'Stage 2+' software upgrades the following are included:

• Vmax Removal (Speed limiter removed)
• Sports Displays recalibrated to suit new outputs
• Enhanced over run on Sports mode (optional)
• Cold start delete (removal of high / loud idle) (optional)
• Catalyst code removal to avoid EML lights

Expected Results, based on our Dyno Dynamics rolling Road:

430-450HP 480-520LBFT

The stock turbocharger is the limiting factor when it comes to the next stage of performance, with compressor/turbines limiting any more flow, we can resolve this by installing a new turbocharger with larger compressor and turbine wheels into the stock turbo housing, this 'Hybrid' will allow much greater air and exhaust gas flow.

With the improved intercooler and exhaust systems already installed, the fuel system will require upgrading to allow adequate fuelling to match the increased airflow mass that the turbocharger can produce. The exact results will depend on the turbocharger chosen, and the fuelling systems used.

Water methanol injection would also be a worthwhile upgrade when pushing for maximum power output.

With our 'Stage 3' software upgrades the following are included:

• Vmax Removal (Speed limiter removed)
• Sports Displays recalibrated to suit new outputs
• Enhanced over run on Sports mode (optional)
• Cold start delete (removal of high / loud idle) (optional)
• Catalyst code removal to avoid EML lights

Expected Results, based on our Dyno Dynamics rolling Road:

480-600HP 500-600LBFT