Quote: You said that you can "hear" the turbos on the trans brake, but is it making boost?
My turbo will make LOTS of noise well before I actually see the boost gauge move.
x2 on that. Mine sounds like a jet on the tarmac before the gauge dips into boost, if you didn't have the gauge you'd swear it was boosting. I'm EFI, but I have a tiny vac line behind the throttle blades for mine and it idles down the fuel psi under vac and goes 1:1 up when into boost. The reference line size wasn't an issue for me at least. I temporarily removed my under hood gauge and put it on the end of the 3' braided line tucked under my wiper arm to verify things were kosher.
A little bit different with a blower. Boost is immediate. Fuel pressure rise better be immediate - along with your water injection if it is signaled by boost pressure. Same thing on the other end with your dump valve. It better open as soon as the throttle blades close.
