Bov - GN and T-Type Performance Enthusiasts (GNTTYPE) Forums

camwfo · #1 10-12-2005, 11:28 AM

what are you guys using for blow off valves with mass air cars?

kenmosher · #2 10-12-2005, 03:21 PM

Most don't ... no real need with an automatic.

camwfo · #3 10-12-2005, 04:30 PM

I hear the wheel in my friends car shuttering when he gets off the throttle under boost. Im a turbo mustang guy but I would assume the principle stands ford or buick. I know I have to run one on my car and its an automatic. I know some of the valves stay open and let unmetered air in motor. I was wondering what most GN guys were doing. I know they dont come with them stock but they dont run that much boost stock.

Keller · #4 10-12-2005, 04:42 PM

Quote:

Originally Posted by camwfo

I know they dont come with them stock but they dont run that much boost stock.

Funny. I thought 15 PSI (1 bar), the stock amount, was considered a fair bit of boost.

Again, few if any cars run them. With a hard shifting automatic, there is no need to let the pressure bleed off between shifts. And on a slow down, proper modulation of your right foot prevents "compressor slam".

kenmosher · #5 10-12-2005, 04:59 PM

Probably no real harm to having a BOV, but also not a necessity.

Even though you might hear the "chuffle" (and you do on the stock car as well, it's just muffled by the air cleaner assembly ... gets much louder with a CAI), there are many cars out there with more than 100K on the stock turbo with no problems. It isn't a big deal on these cars, it seems.

I have never run one on my car in all these years with all sorts of high boost and bigger turbo. I've never had a problem with the turbo (I seem to be able to break almost everything else though!

), other than a TA62 that just plain had balance problems.

Again, wouldn't hurt anything, but no clear advantage to one either.

camwfo · #6 10-12-2005, 05:10 PM

ool...thank for the info

PaCemkr86 · #7 10-12-2005, 07:09 PM

im running the big HKS unit and have used the greddy TYPE R..
its works , i like it

derek · #8 10-12-2005, 08:02 PM

Quote:

Originally Posted by Keller

Funny. I thought 15 PSI (1 bar), the stock amount, was considered a fair bit of boost.

Again, few if any cars run them. With a hard shifting automatic, there is no need to let the pressure bleed off between shifts. And on a slow down, proper modulation of your right foot prevents "compressor slam".

I try to exercise this philosophy with about 35% success.I'm also considering a BOV because that flutter sound just makes me cringe and I think a BOV to atmosphere with a horn would sound wicked.

Keller · #9 10-13-2005, 01:30 AM

That sound should make you cringe, as it isn't good for the turbo.

In the early years that I had my car, and when I first had an open elemnet filter on it, I sometimes found that happening on the street after a quick burst of acceleration. After learning what it was and what it meant, I started pulling my foot back off the gas less abruptly

As far as a blow off valve "sounding cool"...I'd rather anyone around be looking at my rear end in the distance, not listening to to a blow off valve. I put this one in the "rice" category. Note the origin of manufacture for many of them, and how they declare that theirs make more noise than the competition, etc. Too much toy factor.

Sorry, not for me.

PaCemkr86 · #10 10-13-2005, 06:32 PM

i agree with you Keller, but i had no luck finding one, that wasnt mad in Japan.
I didnt install mine for the sound, just the function.
And i have had NO problems with it blowing off to the the atmosphere
with the DEFCO function in the ecm.. so there is no need to pipe it back into the air intake