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Which BOV?

DaGr81

By DaGr81,
in Engines & Forced Induction

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TTT Grand Master

TTT

Posted
Posted

1.) the sound it will make is not the same as the SR20 powered cars.

it is similar but not the same.

on the SR20's, that noise is caused even though they have the stock plumb back bov attached.

the return line of the S15 and S15's isn't large enough so once you increase boost a little bit, you start hearing that "DO DO DO" sound you described so well.

I can show you this in my car if you are in sydney.

The sound the skyline's make with no bov is more like a rattle snake.. like "trrrrrrrrrrr"

However, once you get a FMIC, the sound changes once again.

2.) Yes you need to block off the vacuum line as well.

a screw will do for that.

3.) Wether this damages the turbo is a whole other story.

there is no real evidence that it does or doesn't.

I know the theory of what happens with no bov all too well so no need to tell me.

Everyone has their own story/theory of what no bov will do or not do.

I don't feel the need to add mine as I have done it too many times and people obviously don't know how to search.

I'll add 2 things though.

1.) I had an ex rally car. it was a 88 Laser TX3 turbo. 1.6L

hi flow turbo.

was putting out 120kw at the front wheels when I disengaged the rears.

this thing was rallied for 50,000kms and I had it for about 20,000kms on the road.

the stock bov was removed.

it was running 1 Bar boost for the whole time, fluttering away on each gear change.

never had any turbo problems..

many others but no turbo ones.

2.) I chose to run the stock bov on my current car and even when I had my skyline for the simple reason that the car worked/works better.

it idles better, it doesn't jerk when you back off from throttle slowly..

it just runs smoother.

Even though my current S14 runs 1 bar boost and on anything above 5psi, it will flutter, normal driving on the road where you are on and off the throttle slowly rather than fast and harsh like on a track, the car behaves better.

up to you what you want.

I personally wouldn't go with no bov and my reasons are above.

if you want the "LOOK AT ME" thing, then go right ahead.

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  • 2 years later...
iam2pro4u Newbie

iam2pro4u

Posted
Posted

From what i understand and what others are saying its not a bov your after. Like the other guy said about taking the stock bov off and clogging the hole. This is actually bad for your turbo. That sound your askin for is compressor surge. When the throttle body closes all the boost built up has no where to go since u have no bov so it throws it back through the turbo making the chh chhhh chhhhh sound. Definately not recommend man.

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Spunky Munky Grand Master

Spunky Munky

Posted
Posted

I personally have a HKS SSQ BOV - it makes a very nice SSHHHTTTT sound... not too loud which is wankie pankie in my opinion... bu you do need a bit of a let off sound as it' a turbo... I have an apexi power flow pod, fmic and a hks ssq - all three work in harmony and you get a SSHHHETTTTTFFF tu tu tu sound which is capped off with a fluttering sound which is tough as ... I reckon this is style... so yeah, my hats off to the HKS SSQ - if you do go for this, get that latest model as the older ones tend to affect your air flow metre and can be troublesome.

Cheers,

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H@ME Mentor

H@ME

Posted
Posted
The fine for an atmospheric BOV is

"Undue noise" $240 in QLD and 3 points

So if you get a quiet one you will be right. I had a turbo smart maximus the biggest they make on my old skyline and everytime i let off i had people on the foot path jump and other cars look and stare so i got rid of it.... HKS SSQV is the only way to go now...

yeah i use an apexi power d1 intake pod with a HKS ssq BOv n i get the nice flutter sound however i have alloy piping which helps a little, but it not to wanky.

i didn't know that was the penalty!! $240 & 3 points!!! wow :)

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