SDI Cam vs PD Cam vs Race Cam on the 1.9 TDI PD
If you’ve spent any time around 1.9 PD engines, you’ll have heard it: "just fit an SDI cam, it’s a cheap upgrade". It’s one of those bits of advice that gets passed around so often it starts to sound like fact. But when you actually look at the camshaft data and how these engines work, [...]












