robert maxey

Just buying my rx7 this week and wondering if anyone knows if an atmosphere blow off valve would give me better performance or be a little easier on the turbos?

rexhvn

The stock BOV is best.

TwilightRotary

iTrader: (3)

yea, while being fun and giving the much desired "woosh", on a basically stock system adding an atmospheric bov won't improve performance.

theorie

iTrader: (31)

if you think that venting your BOV will give you "performance" then you don't deserve an FD.

don't buy it. get a shitvic instead.

EjCabrera

iTrader: (4)

the only way i can see a blow off valve helping is if you had two blow off valves

Monkman33

iTrader: (28)

can't you just vent the stock one to atmosphere? since the system is MAP based, you'll get the sound and it will still look stock. I dont know if that is a big deal where you live or not.

I thought both the BOV and the CRV (correct em if I am wrong) could be vented to atmosphere... since they both just vent into the airbox anyways. I believe Mazda did this to dampen the sound. Just do a little reverse engineering.

Plus, if you want to make the BOV respond faster... if it makes that much of a difference, there is a guy that can modify your stock one to be just as fast as any aftermarket. someone post a link to info? I never saved it.

dgeesaman

iTrader: (7)

No.

dontlift

The BOV is open under vacuum. IMO it's not worth the risk of breathing unfiltered air just to get the rice sound.

theorie

iTrader: (31)

it's only very slightly open - like a slit. not completely open, and definitely not open enough to suck in anything.

on my previous FD i had an homemade (pettit style) intake and i left my BOV & CRV vented. in two years of having them like that i never had a problem.

dgeesaman

iTrader: (7)

While it won't suck in a t-shirt, the big risk is tiny bits of grit that wear the engine.

Not to mention that most turbos blow at least a little bit of oil. That filter is the only thing keeping that half of the engine bay sorta clean.

Dave

swif

iTrader: (4)

Would this second BOV replace the CRV?

And if so would you place that in line with the first BOV? Like on a Greddy elbow side by side.

robert maxey

thanks a lot for the info. ill just stick to the stock bov.

Monkman33

iTrader: (28)

Ok, so run the stock BOV to atmosphere with a filter on the end. I bet it is still loud enough to hear and it will (still) do the same thing it did before... and the same thing an aftermarket one will.

Fixered yo!