Are there any considerations from the inertia of the valve itself - it would seem if you go with a much larger valve then it will take longer for it to open - possibly leading to compressor surging, etc.?

Would it be reasonable to run one large valve and one small one, or what that be a waste (i.e. it isn't an issue?)


Chris

 

I'm not a DSM "tuner", and don't really know much about the 1G BOV recomended. I just doubt that a BOV designed for a ~200whp car is going to flow 1kCFM




Thats exactly what I am saying. There are alot of people who use these BOV for alot of things not just a 200 hp 4 banger. They have been used on a good deal of 500 awhp DSM's. They are a very good BOV and thats whay they get used on a wide variety of vehicles big and small motors. They can handle high psi when crushed (25 psi) and flow a great deal of air, I am not sure on the exact CFM. I also wonder why no body know or seems to care what size turbo he is using or what his setup is. That has to do more with how much the BOV needs to flow that the size of the motor. If he is running a T88 then he will need a good deal of flow if he is runnign something smaller then he wont need as much. Again like it has been said before no one said that a DSM BOV is the only one or the best, but it is a cheap alternative that WILL work. What we lack in CI we make up for in air flow. I personally would go with the Tail like many people have said numerous times becasue it will work very very well.

 

i run a procharger race blow off valve, so far i haven t turned up my boost to let the new motor break in, my friend runs the same blow off vavle on his f1 procharged motor at 22 lbs of boost with no problems, this blow off vavle is huge and i believe when i measured it before installing it the vavle itself is about 2 inch in daimeter, i have no surging problems with mine.

heres a link to a picture of mine if you scroll down you ll see it.

http://www.s10forum.com/forum/showth...+off+and+valve

 

Just FYI, the DSM guys who run 10's use the stock BOV that is just crushed. They run huge turbos at 24+ psi on the stock BOV because it is a very good design, in fact the BOV is made by Greddy. Another thought is some one who has a stock WRX BOV, basically the same as a DSM with a little stiffer spring. My buddy who had one put a aftermarket BOV that was TurboXS and it leaked at 20 psi and stock doesn't leak, he has hit 23+ psi, on an 18g. In my mind both would do just fine as long as you kept it under 15 lbs.

 

i believe that is how the HKS SSQ bov works. Dont quote me on it though

 

Just throwing an idea out, but what if you ran two of the DSM BOVs? Just curious to see if this will work. I know you can run multiple bypass valves on a supercharged system, I don't see why it wouldn't work w/ a turbo.

I'm wanting something quiet. If I wanted something to make a lot of noise on the street, I would've kept my Procharger. Stealth is the word here.

 

You could throw a map sensor in your intake tract and datalog it - that will let you know for sure if it is working.

Also, is it better to put the BOV close to the throttle body (where the pressure wave begins - air starts piling up), or next to the compressor (what I really care about and want to prevent an overpressure on)?

Thanks,
Chris