master blaster

i have a vortech bov with a&a kit. it was to loud when going part throttle. hissing and chirping......it bugged me.
first have the bov filter point away from the driver side.
second i stuffed dense steele wool in the filter.
its fixed the problem!
I got the steele wool from auto zone....comes in a variety pack.
best mod ever!

C5-Bender

This mod have most likely lowered the effectivity of your bov since it reduces the flow thru the valve. It is much better to lead the air coming out of the bov into a box wich will act like a silencer

Roger

master blaster

how could i tell if it has a negetive effect on performance?
i stuffed the steele wool in the filter wich is outside the bov.
air still exhales but is quite now.

leatherbee408

Maybe there is an issue with your blow off valve...Mine only opens up when I shift to relieve pressure in the system when the throttle is closed suddenly....I am not familiar w/t the AA setup maybe it is spose to open slightly @ part throttle. However I don't think by doing what you did would lower the performance as long as the air can still get out...Seems to me your just making the valve a silencer....

But personally I think it is the best sound ever when they go off...two 68MM turbos @ 20PSI---people turn around from all directions to see what the hell blew up...Not quite as loud when I have the controller set @ 12PSI, but still pretty loud....

DOUG @ ECS

Simply use two BOV's
Half the air going threw each one will quiet them down alot.
I do this alot on 427's or really high boost cars when the customer wants it stealthy.

master blaster

hey doug, is there a down side to stuffing the filter with steele wool?
it seems to drive fine.

Skunkworks

Just a thought here, get a larger the blow off, which will lower the air velocity. This should result in less audible noise. Tial makes some niece ones.

Stuffing steel wool in valve exhaust will reduce or choke your flow. The blow off is designed to protect compressor and keep it from surging.

Surge can be compared to an aircraft wing stalling. This can promote impeller blade/airfoil vibration, which accelerates metal fatigue.

Mike

master blaster

are you sure that it is bad to stuff the filter?

Skunkworks

I’m not sure I understand the question. But if it is referrers to original topic, then it depends on how much you are restricting flow. If you are muffling it and say reducing flow by 10-15%, then probably no harm. But if restriction is considerable, then you are defeating the purpose of a BOV.

This is from personal experience, I was testing impeller although not centrifugal type and deliberately put it into surge state. Temperatures increased and resonance/vibration set in, followed by catastrophic failure. Tip speed was around 1000 ft/sec when blades separated. Well you can imagine the rest – but if you like destruction, then it was impressive.

ATI and Vortech, both make very good products/kits and this is why they include BOV.

Turbos have an advantage, in which they are not mechanically coupled and slamming throttle shut has similar effect but for not as long. You can actually get turbo impeller to spin backwards if it does not have BOV!

On an ATI or Vortech, you are mechanically coupled and dumping 40+ HP into blades that can be 0.06-0.08 inch thick at root. That’s not allot of aluminum.

I would say be careful of restriction you are adding.

Mike

DOUG @ ECS

I never tried anything like that, it would seam to easy to get into the engine and couse a problem.