blow off valve locaton
#1
blow off valve locaton
i have a rfl adjustable blowoff valve on my sr. i've seen many different photos of many different turbo engines and have noticed that the position of the bov's are all over the place. some have the bov on the intake piping. some have it on the pipe between the turbo and the intercooler. i have it on the pipe between the intercooler and the intake manifold... what i want to know is if there is an ideal position for it and if there is, why? i have a hose leading from my intake manifold to the bov flange, which one of my friends said would, help expell excess pressure after the charged air enters the throttle body. or i hope it's working that way... any in-depth info would be greatly appreciated cause i feel i need a better understanding of this to make my car even more responsive. also, is there a way to re-circulate the air that the bov is releasing to decrease lag?
#2
omg, i'm such a stupid douche. the bov's on the turbo to intercooler pipe is the external wastegates aren't they?????? actually, i'm not even sure anymore. well, any info or disses would be welcome... hahahaha
#3
it really is a matter of opinion to which position is best...no position is noticibly much better than the other (though garrett says the bov should be placed after the intercooler....i'd trust their opinion, as they make turbo stuff for a living) i'd just find the position that best suits the space constrictions of your engine... yes, you can and should recirculate your bov...you recirculate it to before the turbo so you don't go lean during shifts
external wastegates are placed on the turbo manifold usually for larger turbos to regulate how much air is going into the turbo so you don't creep, spike, and/or overboost...
external wastegates are placed on the turbo manifold usually for larger turbos to regulate how much air is going into the turbo so you don't creep, spike, and/or overboost...
Last edited by ka-tfresh; 05-24-2007 at 04:08 PM.
#4
is it true that bov's can cause stalling? cause my engine's rpm will crash when i don't feather the throttle when i dip the clutch to brake. i'm just trying to find out why my engine bogs cuz i read on wikipedia that because the bov releases air after the maf sensor tells the injectors how much fuel to fire, a bov inadvertently floods the engine... it makes sense but i wanna know how to make it stop cause i don't want compressor surge or engine flooding.
#6
yeah the main solution to all your bov woes is usually to recirc it... when the bov is releasing air when it's not recirculated, ther maf cannot account for that air, and it may cause you to run rich between shifts, have a crappy idle, bog etc... when you recird your bov, that air that is being released now has a chance to be metered by the maf, so your **** runs good
#11
I have a question : on a blow through setup would the maf be between the throttle plate and the BOV?
#14
Its actually a bit of a debate which is correct and OEMs put them in all different spots, even on different generations of the same car such as an s13 vs s14 silvia.
One way suggests its best near the throttle boddy so that pressure can be release right at the point it is first created by the shutting door and keep in the direction it is traveling.
Another way suggests it should be relatively close to the turbo because the shock wave travel in the reverse direction starting at the throttle body andhave it by the turbo ensures reponse time and that the pressure gets out rigth before it goes back through the turbo.
I say it makes little difference and go with what is easiest.
One way suggests its best near the throttle boddy so that pressure can be release right at the point it is first created by the shutting door and keep in the direction it is traveling.
Another way suggests it should be relatively close to the turbo because the shock wave travel in the reverse direction starting at the throttle body andhave it by the turbo ensures reponse time and that the pressure gets out rigth before it goes back through the turbo.
I say it makes little difference and go with what is easiest.
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