![]() To balance "fleet" requirements (another example from the US, makers are rewarded/penalized on maker's overall averages for fuel consumption and maybe for emissions as well, so tuning may get tweaked to manage this).To meet insurance requirements (horsepower limits for example).To fit into a particular regulatory class (in the US, for example regulations change with the load capacity of a vehicle).To find a balance between performance, durability, and marketing needs (detune in Sprinter to improve reliability, tune in E-class for marketing/performance).To match the engine to a specific use case (as you suggested here).I'd be tempted to restate the question as "How do vehicle manufacturers decide what to tune for?" For the question as asked, there are a lot of possible reasons, and probably no way to know in a specific case unless somebody involved speaks up, but in general: If non-design reasons are involved, would it (sometimes) make sense to tune these again to their 'normal' specifications? In this case, the only difference is the peak power output, the rpm at which this occurs and the max torque is still the same. ![]() I live in Belgium but I have no idea why they would have done this for Belgium specifically. Or are there other reasons (fiscal, strategic.) that lead to these decisions? Using the same example, in Belgium the engine was detuned whereas in other countries it was not (both for the same cars), as can be seen in the Wikipedia page. In the example I gave, that seems to be the case, with the van reaching top power and top torque at a lower rpm than the sedan. The same hardware (and thus the same cost), yet they 'artificially' lower the power output and thus the specs they can use to sell the product.ĭoes it have to do with using the same engine for different purposes? With a van you probably want a different power and torque curve than with a sedan. Same engine, lower (peak) power output in the Sprinter than in the E-class. An example - there are many others - is the Mercedes-Benz OM612 engine. ![]() I was wondering why a manufacturer would detune an engine.
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