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The McLaren 675LT makes 675hp and 700Nm from its 3.8 litre twin-turbo V8. Our Stage 1 calibration takes it to around 730hp and 830Nm, written for the car's own ECU file after a health check, stock dyno runs and data logging so we know exactly how the engine is behaving before anything is changed. On this generation the ECU is removed for reading and programming and refitted the same day, and the original file is kept for a return to standard.
Measured on our Mustang AWD rolling road in Maidstone. Wheel figures, drivetrain loss added for the flywheel numbers.McLaren ECU remapping that is safe, & reliable by true professionals and enthusiast. McLaren 675 is one of the best super cars for engine tuning & ecu remapping. The McLaren 675LT, announced at the 2015 Geneva Motor Show, is a track designed, lightweight version of the 650S. Named the “675” the car’s power output (in metric horsepower), and “LT”, as reference to the “Long Tail”.
As with all of our software development we follow a strict set of procedures for McLaren ECU Remapping.
First we performed a health check using our diagnostic testing equipment. We could then put the vehicle through a set of stock dyno runs and data logging. Data logging the engine in standard form allows us to understand every aspect how the engine and ECU calculates its data. Our first data log and dyno run revealed the engine is healthy albeit slightly less horsepower than the manufacture claimed which can be down to something simply like intake air temperatures on the day.
We then proceeded to remove the engine ECU so we could safely connect our equipment directly to it in order to extract the data required. This data extracted is then analysed by our in house software developers making small changes to unlock the full potential from the engine. We also compare the ECU software with our dyno recorded logs so we can see exactly how the changes will adjust the engine parameters.
The ECU is then re-programmed with the re-calibated software for a dyno & data log to ensure everything is reacting correctly to the new software map.
Making the perfect tune takes time on and off the dyno making fine adjustments until we reach perfection. This Intricate procedure allows us to write a file that is safe and yet strong in power. It’s this meticulous attention to detail that demonstrates the care we take when producing each one of our maps.
After the final map is written and we are satisfied with the results and safety of the engine and drivetrain, we road test the vehicle in different driving scenarios making sure its drives just as well or better in every mode.
So we have been able to tune the McLaren 675LT to 730-740BHP and 820-830Nm – Please note the dyno graph on this page is power shown at wheels and such will be an drivetrain percentage loss to calculate.
We now also have a range of upgraded air filter and exhaust system upgrades for the McLaren models. We also offer McLaren ECU Remapping for the MP4-12c, 540C, 650S and 720S models.
Collection or on site tuning is offered worldwide for these exclusive vehicles.
Photos from the build
1 photos of this McLaren 675LT in our Maidstone workshop. Tap any to enlarge.
Questions we get asked
Which McLarens can you tune?
The 12C, 650S, 675LT, 570S and 720S all use versions of the same M838T and M840T V8 and all respond well to calibration. Figures differ by model, so ask us for your car.
Why is the ECU removed rather than programmed through the OBD port?
On the 675LT the ECU has to be read on the bench to extract the full calibration. We remove it, read and program it, then refit and test on the dyno. It is a routine job for us and the car goes back together exactly as it came in.
Can the gearbox be tuned as well?
Yes. The seven-speed SSG dual-clutch has its own controller which can be recalibrated for faster shifts and torque limits that suit the engine tune.
