Yes automatics have blow off valves. All turbos have blow off valves of some sort. Most stock bov's dont go psssshtt.... but if you have an aftermarket one on an automatic car... it should still do it.
bowlofturtle said:wow. so no way to hear that turbo or anything like that and no sense in getting aftermarket BOV.
Boost isnt constant with an automatic, it will change when the transmissions shifts.boost is constant with an auto tranny, so you dont hear the bov between shifts
True for a car with a manual tranny. You normally let off the gas before you shift.bowlofturtle said:when your tranny shifts your car thats when left go off that gas thats when the car is shifting so yea thats where you hear the BOV.
When you let off the gas theres a build up of pressure between the turbo and throttle body. The built up pressure is a result of the throttle body closing.As for functions of the BOV, i dunno about that, i;ve only know that BOV makes that PSHHH sound. lol
Yes but engine RPM changes and when the engine RPM changes, the levels of boost change for a moment, SO the blow off valve would sound, as the engine would for a moment suck less air than the turbo is pushing in.But in a car with a auto tranny you normally just floor it and don't let off the gas.
BOV is actuated by pressure alterations. Boost (positive manifold pressure) keeps the valve within the BOV closed, IOW you have pressure pushing on top of the valve keeping it closed.
i dont think thats how it works. the reason is sounds on a stick is because when you shift you let off the gas thus closing the tb. that presure needs to leave so there is no damage to the turbo. in an autop the tb is always open at wot therefore not needing the bleed off any boost pressure during the shifts. the only time you should hear the bov is when you let off the gas in and auto.Flashmn said:Yes but engine RPM changes and when the engine RPM changes, the levels of boost change for a moment, SO the blow off valve would sound, as the engine would for a moment suck less air than the turbo is pushing in.
Only cars that you really dont use a blow off valve are diesels, but they lack throttleplates all together.
Yes.bowlofturtle said:does that mean with an auto everytime you lay off the gas the BOV blows? well giving a certain speed in order to build up pressure.
Its the same regardless of the type of tranny.Would the PSHH sound be comparable to a manual sound ? I figure it might not be always as good sounding. But a very nice sounding PSHH.
Its not a matter how you think it is, its mechanics.i dont think thats how it works.
exactly, how it works. so its not gonna blow off boost if there is no reason to.Flashmn said:Its not a matter how you think it is, its mechanics.
unless you put a turbo kit on your car there is no need for a bov. and if you put it on a stock NA car it wont work.2k4CamThrilla said:Is it possible for me to put a BOV on my 04' Camry auto?