What is “direct injection” as opposed to regular ol’ “fuel injection”?
What is the advantage of “dual-clutch”?
Good question. The only dual clutch vehicle I’ve ever heard of was in a Ferrari Testerosa, for high end performance.
In DI, the injector shoots directly into the combustion chamber above the piston. Previous injection designs shoot into the manifold or cylinder runner.
Dual clutch is a transmission that combines elements of a two shaft manual trans layout with clutches in place of synchos.
It’s an attempt to combine the best of both systems.
I googled both. It’s fascinating. The dual clutch uses one clutch for some gears and another for others. This allows the transmission to engage in third gear while you are in second, and then it releases the clutch attached to second gear while simultaneously engaging the clutch for third gear.
Regarding direct injection:
Normal fuel injection injects the fuel into the air on it’s way to the combustion chamber, so a “fuel/air mix” enters the chamber. In “direct injection”, only air enters the chamber and a fuel injector that is IN the combustion chamber adds fuel to the air right there, sometimes in multiple high pressure spurts for each combustion.
It is claimed to get 15% improved fuel economy but has some drawbacks.