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Hilarious Vl Turbo Bov Sound

GTAAAH

By GTAAAH,
in Engines & Forced Induction

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GTAAAH Mentor

GTAAAH

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Hi um i have been wondering and debating with my friends for quite a while, what makes the BOV's (or the majority of) on VL turbo's sound so bad? Like normally i dont mind the tshhhhhhh sound but the VL turbo's go tsh tsh tsh tsh tsh like in fast succesion at a high pitch and its hilarious. I have noticed HKS sequential BOV's which i assume let the air off out of 2 openings and thought perhaps this could be the cause of queerness. Also i was wondering if it could be that the BOV is like loose or far to small or something? Like its slapping open then coming back down on itself and being slapped open again by the air rushing out. Could it be like absurd amounts of compressor wheel surge or something?

I know thats not really skyline related but well i dont know a huge amount about turbo'd cars and have been laughing at VL's for like 5 years trying to figure out why they (or the vast majority of) them sound so gay. ( and they got like r31 engines in em right?)

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got_boost? Apprentice

got_boost?

Posted
Posted

That noise you are reffering to is called compressor surge. It personal choice whether you like it or not but the reason why it makes that noise becasue as you take your foot off the throtle their is no BOV for the air coming from the turbo to ecscape so it goes back out through the turbo making that tsh tsh tsh tsh noise.

Mr. Oizo Grand Master

Mr. Oizo

Posted
Posted
No blow off valve & no intercooler

They do have an intercooler, finding a decent picture of a stock RB30ET engine bay is the difficult part

nissan_motor_gerry.jpg

See right before the throttle body, that is a factory VL Turbo intercooler.

got_boost? Apprentice

got_boost?

Posted
Posted

It can still make that sound with that crossover pipe because it doesnt have a BOV(im pretty sure) that tiny cooler thing isnt really going to effect the compressor surge. If its taken you years to work out what that noise is well you havnt been round very long cause theres normally a thread about it weekly

Mr. Oizo Grand Master

Mr. Oizo

Posted
Posted
It can still make that sound with that crossover pipe because it doesnt have a BOV(im pretty sure) that tiny cooler thing isnt really going to effect the compressor surge. If its taken you years to work out what that noise is well you havnt been round very long cause theres normally a thread about it weekly

what

GTAAAH Mentor

GTAAAH

Posted
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Posted

ahh but my car doesnt have a bov and doesnt make the queer noise. Is it because of a larger turbo size? Like more air banking up and rushing back into the turbine when ur intake(?!?) closes makes the noise right, so a bigger turbo would produce more of that and make more of a noise out of it?

Bluprint Veteran

Bluprint

Posted
Posted
They do have an intercooler, finding a decent picture of a stock RB30ET engine bay is the difficult part

nissan_motor_gerry.jpg

See right before the throttle body, that is a factory VL Turbo intercooler.

lol, that's not much of an intercooler :)

2BNVS Veteran

2BNVS

Posted
Posted

r32 gts-turbo- when i got a new motor fitted in my skyline rb25/30, and at that time i didnt have a bov for it (now it does) it made the exact noise but yeh i didnt mind it too much, but mine flutters at low psi then has the usual bov whoosh at higher boost levels

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