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As a side question, how is dyno tuning get around ECU learning?
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You make the correct questions. Usually, they don't handle the ECU learning thing. They just set IAM to 1.0, instead of 0.7 which is the factory setting, and dyno the car directly after the flash. This means that you don't know if the gains are still there a 100% after the ECU adapts to new parameters. I had a discussion some months ago with a racing driver in Nürburgring and he was mentioning that if you want the best results, then you need to install a new ECU to an open one. By changing the ECU, you have the advantage that you can change the parameters live during the dyno (you change the parameters while the engine is running) and you have more control how the ECU will behave afterwards! The factory ECU in certain areas is a black box. Unfortunately, the cost is very high for my tastes. Approximately 2,000 EUR for the new ECU + new harness wiring and an additional 1,250 for the ECU mapping by a professional.