|
Diesel Vacuum,
Just thought I'd add, I think the general theory is no vacuum, that would be true at idle, but as air volume goes up, with the restriction of the air filter particularly, there is vacuum in the intake system, that is why they benefit so much from ram air setup.
I discoverd this when I set up a manometer on intake system, and am currently organising a vacuum gauge to set up permanently, this will give me a guide on how efficiently the engine is running using the info from both the vacuum & boost gauges, basically telling me the pressure difference across the turbo, less difference, les power drain by turbo.
|