Jump to content
SAU Community

Recommended Posts

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?)

Link to comment
https://www.sau.com.au/forums/topic/112733-hilarious-vl-turbo-bov-sound/
Share on other sites

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.

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.

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

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

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?

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 :)

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...

Guest
This topic is now closed to further replies.


  • Similar Content

  • Latest Posts

    • Oh, also, forgot to add these photos I believe.
    • Thought i'd update on this. I was able to get in contact with Craig Lieberman and later on Darryl Alison (owner of Kaizo Industries). Darryl was able to help me verify that my car was in fact one of theirs and is helping me find more info on mine !
    • There's restrictor pills in the stock boost control hoses. That's how they set the amount that was bled off and hence the "high" boost setting. The usual mod in the day was to remove it and send the "high" boost setting up to about 14 psi.
    • Thanks Duncan, that's the best info I've read. Furthermore after learning about the PCM programming side controlling the factory boost solenoid, the purpose of the solenoid is to "bleed" boost when pin 25 is earthed, thus allowing spring pressure in the wastegate actuator to overcome diaphragm boost pressure, thus closing or reducing the position of the wastegate flap creating more boost as the turbo is able to spin faster. It's pretty cool to see a designated Pill to do exactly this, would have liked to have seen it with a tiny filter over the end for those moments in vacuum.  The constant bleed pill has now been removed completely from the system and solenoid boost control has been restored once again.   Case closed 😂
    • The wideband reading is meaningless if it's not running. Why are you using shitty old sidefeeds on any engine, let alone a Neo? What manifold and fuel rail are you using to achieve that? Beyond that, can't help you with AEM stuff as I've never been their ECU/CAS combo.
×
×
  • Create New...