Hi All

New to turbos and boost and had a couple of questions. On Idle the boost gauge is showing as -10/-15 on vacuum, whilst the car is stationary on revving the engine fairly hard the boost gauge moves up to 0 and no more. Is this because revving the car when stationary won't show boost as the car is not under any load? I thought the car would still show boost even if revving whilst stationary. The car should be making 18psi.

Thanks in advance for your answers.

 

that's normal mate,

 

Yeah it takes the engine to be under load for the turbo to create more air than the engine is using. As stayed that's normal.

 

thanks guys. But what about the dump valve, that should still work whilst the car is stationary and being rev'd right...?, but the dump valve doesn't open just stays closed. Why might that be?

 

Same reason, if the engine is not building enough/any boost during stationary revs the DV won't work.

 

There is no boost for the DV to dump so to speak, you only get proper positve vac pressure when the engine is under load rather than just revving