Is Turkey Harmful?
- Thread starter HeHateMe
- Start date
My personal opinion, and please correct me if I'm wrong: When you step on the clutch, the pressure charging into the throttle body needs a place to go. The reason for a bov is to release this charged air from the pipes. However, because our turbo's are way on the other side of the engine, there is more distance of piping than a custom aftermarket turbo kit. If the charged air is exhausted into the atmosphere, a "vacuum" is created in the charged end of the pipes. There isn't enough air in the pipes, the engine riches out and stalls. The reason for the bpv on our cars is to send that charged air back through the turbo to help counter-act this "vacuum". "Pressure Surge" is when there is no way of this air to escape and heads back down to the turbo. The reason why this is bad is because the fins on the turbo's blades are designed to move air in one direction, the air moving backwards on it causes problems and eventually causes the intake blade and exhaust blade to snap off (the complete "turbine") of each other (bad boom, turbo done). The "turkey" is actually the charged air running back into the "uncharged" portion of the intake set up, not pressure surge. For ex: I run 10psi of boost. That means that when I step on the clutch, air over a distance of, i don't know, maybe 6 feet (????) with a Dia. of 3" is a volume of close to 42 cubic feet (assuming 6' pipe distance) of "charged air" at 10psi. This volume of air flies through the bpv at a rate greater than that of which the "uncharged" side of the turbo can pull it through. This causes the excess air to blow out of the intake filter as the turbo is trying to "suck" it back in. The reason why aftermarket cai's have a "louder" turkey is because they generally, have a larger dia tube than stock. The air can escape through the air filter faster than stock, and also be sucked back in faster than stock. This (get your minds out of the gutter!!) blowing and sucking causes the resonance of the pipe to create said "turkey".
Hope this helped.
Hope this helped.
- :
- 2003 Subaru WRX Wagon, 2000 Miata
i still think the turkey sound comes from the location of the BPV outlet on the hot intercooler pipe. if the nipple and BPV were repositioned on the cold intercooler pipe, i don't think it would make that noise. it would still recirculate into the intake tract.
actually, does anybody have this setup on a somewhat stock MSP?
actually, does anybody have this setup on a somewhat stock MSP?
Compressor Surge is the turkey sounds. Yes it can be harmful for prolonged periods of time and can increase shaft play in the turbo. The surge comes from the throttle body closing and the turbo still spining and compressing more air in the pipes. The air deflects off the throttle body plate. The issue is the stock bpv can't move enough air quick enough to stop the compressor surge. Stock boost its not a big problem, being that the turbo will most likely outlast the car. At higher boost levels 20+ this could become a big problem.
Going to have to disagree with this one. To prove my theory cap off the pressure signal to the stock bpv and disconnect. No air could move through the BPV. This is easier if you have an aftermarket BOV, you could just tighten it all the way. The turkey will be even louder, careful not to go in too much boost, as it is possible to bust off the stock plastic pipe.
icespeed said:
yes i have searched, thats why i asked cuz i never found a answer. I dont think its a problem, but the fact that i have a aftermarket BPV on my hardpipe, it will fow more air after the MAF. SO that might add more air for a few seconds causing a slight leaning out. But that shouldnt be a problem
- :
- 2003 Subaru WRX Wagon, 2000 Miata
Notorious said:
so technically... if a good BPV or recirculated BOV was placed on the cold hardpipe, it could essentially replace the stock BPV?
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Hellnightkid
Member
- :
- Mazdaspeed Familia
i thoughht turkey sound like a BOV...
i like to get high and listen to the turkey's call.
hell yeah. i love my turkey. it's so unique. where else does a stock car come with a bpv that so0unds like that. most people who dont know s*** about cars are probably baffled and baffooooned when they here a turkey go past them at 40+mph (pending on which "turkey call" i'd like to send them). i dont know boout ya'll but my turkey stays until i need a better boy/bpv.
dats my two cents
take it easy
-dave
dats my two cents
take it easy
-dave
yep you are right, when the throttle closes, the air has no where to go, which is what a BOV or BPV is there, and if the bov is not sufficient enough to get the air out of the piping asap, it will send it back to the turbo, basically like hitting the brakes on your car, that's what the air does to the turbo's compressor wheel, and intern makes a "turkey" type noise, if you listen to other vehicles with compressor surge it makes the same type of noise, if not exact....if you are getting compressor surge alot, it will hurt the turbo alot faster then if you did not. like nutorious said, at low boost levels it isn't as big an issue as say a supra running 30psi and getting it.Notorious said:
