What's the word with pop-off valves?
 

I have every thing for my setup waiting in the floor of the garage, then my friend mentions a pop-off valve. I have an unopened wastegate actuator witha 6psi spring. I also have a btm and a bov. Do I really need a pop-off valve? I don't want to grenade my engine cause I don't have a spare any more. I need advice. Thanks

Re:What's the word with pop-off valves?
 

i would imagine hes referring to a BOV, and you said youve already got one, so it sounds like your all set

Re:What's the word with pop-off valves?
 

;D ;D Just put a balloon on your tailpipe and start 'em up. I'm sure it will "POP" pretty quick!! JK

Re:What's the word with pop-off valves?
 

tell your buddy he shouldn't make up parts for cars.
then ask him if u should add in a "6 pak axle side lock anti break sensor, with a turbosuped 8X9 half exhaust valve tip"

Re:What's the word with pop-off valves?
 

sounds expensive ;D

Re:What's the word with pop-off valves?
 

A pop-off valve is a real part, but I can't remember exactly what it does... just do a google search on it.

Re:What's the word with pop-off valves?
 

A pop-off valve is a real part so don't give your buddy too hard of a time because it can be a good thing to have, but it's not neccissary. Basically its a pressure relief valve that incase you overboost, it'll blow before you're headgasket or motor does. Let's say you're running 5psi of boost. You set your pop-off valve to 6 or 7 and if a vaccum/pressure line comes off the wastegate this valve will save your car from achieve insane boost levels which obviously has a good chance of saving the headgasket, or your piston rings. I think HKS makes an adjustable one...I'm not sure who else does tho.

Re:What's the word with pop-off valves?
 

A bov is a popoff valve.. your all set! ;D

Re:What's the word with pop-off valves?
 

A BOV prevents back pressure on a turbo. But if what spork said is right... That is bad ass! and where can I get one?

Re:What's the word with pop-off valves?
 

it also protects the engine when you close the throttle, the pressure builds up quick... The WG wont save it from overboosting momentarily

Re:What's the word with pop-off valves?
 

here is a like to a pop off valve. and no its not a bov..
http://www.rx7.com/cgi-local/3catalog.cgi?cat=9&part=4

A BOV releases pressure under vacume, hence when the throttle plate is closed, so you dont get back pressure on the turbo. it has nothing to do with a wastegate.

Re:What's the word with pop-off valves?
 

yeah exactly its not at all like a BOV. early 300z turbos have them just incase the wastegate fails... just kinda extra insurance i guess like say you have a deltagate wastegate with a 7psi spring and no boost controller, one minute your at 7 psi the next at 14 hehe

Re:What's the word with pop-off valves?
 

Hrm, sounds like this device is the same as the "manual ball bearing boost controller". Only, one end goes out into open air. Hrm.. Possibly save yourself $108 and use of those. ;D

Plus.. can even splurge and get some $1.50 Kryogen paint and spruce it up a bit..

Re:What's the word with pop-off valves?
 

I wouldnt.. well it wont hurt. but it wont help either... a bov or a popoff valve releases the extra boost into either open air or piped back into the turbo inlet.. It has quite a large diameter and quickly releases "dumps" the pressure. see when your hard on the boost and release the throttle quickly, the turbo spinning at 75,000 rpm or so is still pumping. This all piles up in the boost tubes as the throttle is closed. the backpressure makes your turbo screetch to a stop. When you get back on it you have to wait for the unit to spool up again "turbo lag". The popoff, bov, or dump valve solves this problem and eliminates lag. ;D you want one. trust me!