Blow off valve?

M

Makaveli

New member
OK, a few guys in my club have blow off vavles. On a VR4, Eclipse GST, and a WRX...I know...rice burners. They hear it all the time from me. Anyhow, in an effort to be part of the "cool" crowd, is a blow off valve possible on a 92 TY? Thanks for any input
 
InvisiBill

InvisiBill

Active member
I like to pretend I know stuff, so I'll post the basics here.

A BOV is activated by a difference in pressure. It opens up between the turbo and intake when the throttle blades slam shut. It vents out that extra pressure that would normally be forced back through the turbo. This a) extends the life of the turbo and b) allows the turbo to spool up again quickly when you get back on the gas. This is a lot more useful with a manual tranny, where you're repeatedly on and off the gas to shift.

At the very least, it will put less wear and tear on your turbo and sound cool. If you're on and off the gas a lot, it may speed up your spool time a little. Overall, not as big a deal for us though.
 
M

Makaveli

New member
What brands are good for the $$$

What brands are good for the $$$

Thanks for the input. I'll check the threads. I was just on some website sayin their could be an overspooling problem...I'll look into it though....
 
G

GOTSWRV

New member
Your wastegate should open before the BOV. The wastegate is to control turbine speed. A BOV is to eliminate presure spikes. As long as the BOV is not the primary control, and is kept as a safety backup (cool noise maker), the wastegate will not allow overspeed.
 
InvisiBill

InvisiBill

Active member
A popoff valve is just a simple pressure valve that goes between the turbo and intake. It's just set at a certain PSI based on the spring. Any pressure above that, from overboost or backpressure or whatever, will be vented out.

A BOV actually hooks to your intake, and opens when there is a pressure difference between the engine and turbo sides of the throttle body.

And yes, your main form of boost control should be the wastegate. This allows exhaust gas to exit, which keeps the turbo spinning in its optimal range. With just a popoff valve, you'd be letting the turbo spin way up (generating lots of extra heat in the process) then venting the extra boost. It's good as a safety item, but not as the sole means of boost control.
 
T

TheObiJuan

Active member
from what i have read the super sequential is pretty popular and their is a kit to put it on our car. i would like to know if there is a kit for the greddy type s
 
canadian

canadian

sy in progress
there's no kit, but if you know someone with a welder you can get it on there. i have one on my sy.
 
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