Audi S8 (D4) 4.0 TFSI V8 513bhp/520ps - Custom ECU Remap and Gearbox Mapping
In this latest tune and dyno test, we take this 2016 Audi S8 4.0 TFSI V8 Quattro and custom tune it, adjusting the software and fine tuning the results from the rolling road dyno testing. Along with this, we also update the gearbox mapping, to really maximise every part of the rev range. The result… Some pretty impressive performance gains!!
Firstly, we take the S8 with completely stock mapping. We get it strapped up on to the rollers, and take it for the first set of tests to establish what the factory mapping is producing. You can see the stock dyno graph here at 0:15. You can see that power and torque are both running higher than manufacturer quote, showing 552hp from a 520hp quote, and 794Nm from a 650Nm quote. These are dialled in, so we know exactly what base we’re working from.
Once we are happy that we have everything logged and the stock figures entered, it’s time to connect to the ECU. We use our Autotuner system to connect directly on to the ECU. The process of this custom tune is very much a hands-on, ‘fine tweaking’ procedure. We make several alterations to the software, adjusting the exact parameters we need and configuring the software files to give us that increased power and torque.
Once we are happy with our alterations, we take it for further dyno testing, allowing us to monitor the engine responses in real time, data logging the entirety of the test. Once the first few tuned runs are complete, the data is analysed and conclusions can be made as to where further adjustments and alterations can be made. Again, we configure this directly within the ECU, changing the exact parameters which are necessary to reach the requirements.
After these adjustments, there are further tests and it’s once again taken for more tuned runs. The data is logged and gains are recorded. This process is repeated several times, as we will constantly analyse and fine tune, right down to the final requirements, until we are happy that we are getting the very best results from this remap.
The final tuned dyno run can be seen here at 0:36 where we have finally finished altering everything, giving us the complete results. Dyno testing before and after shows healthy gains across the rev range, with a significant increase in power and torque, really transforming how it feels to drive.
Peak power was increased significantly. We were able to lift it from 522hp at stock, up to 640hp after the custom tune. Taking a look at the tuned dyno graph here 0:48 you can see how the curve changes (dotted red and blue lines), bringing that power in right down from those lower revs, and showing improvements across the whole rev range. Pay attention to that midsection, where we can really notice a huge difference. As an example, at around 4500rpm we can see stock power was logged at around 450hp, whereas now we have lifted this to around 600hp, adding 150hp for that part in the revs. This shows that we’ve given a massive lift across the entire rev range, right up to its peak.
Torque also saw huge improvements. At stock the engine produced 794Nm, and now 947Nm after the remap. Again, taking a look at the graph (solid lines), you can really see the difference in that curve. If we take another look at around 4500rpm, we’ll see that stock torque was logged around 700Nm, whereas now we see it at around 900Nm, adding an additional 200Nm at that part of the revs. Again, this shows really impressive improvements throughout the whole of the rev range, really transforming how the vehicle now feels out on the road.
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