Hilarious Vl Turbo Bov Sound

[GTAAAH]

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?)

[oRiCLe]

standard VL turbos dont have blow off valves do they? thats compressor surge going tsh tsh tsh tsh

[got_boost?]

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.

[got_boost?]

Correct and it normally only works when you have a less restrictive intake such as a pod filter.

[Bluprint]

standard VL turbos dont have blow off valves do they?

No blow off valve & no intercooler

[Mr. Oizo]

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

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

[got_boost?]

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]

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]

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]

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

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

lol, that's not much of an intercooler

[oRiCLe]

hehe, its more like a heatsink

[dan_the_man]

intercooler?

ok...

[dan_the_man]

[Mr. Oizo]

hehe, its more like a heatsink

That's what an intercooler is

[dan_the_man]

I dont think holden had "intercooler" as a specification

[Primordial]

yer I'd feel ripped off if my "Intercooled Turbo" VL came with a heatsink off a car amp!!

[2BNVS]

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

ben...

[R31Nismoid]

another "BOV" thread... gets the same treatment as all the others

damn busy day in FI ive had