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R&D upgrades - What do they do exactly?

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In the career mode,how do each of the 5 groups of R&D upgrades affect the car? Many of them seem to do very similar things. Can anybody help on this?

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Engine is straight line speed. Fuel injection is better fuel management so you can run rich mix for longer with the same fuel. Chassis weight is for better acceleration/speed. Downforce is for better cornering. Drag is for better top speed.

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