Jump to content
SAU Community

Recommended Posts

i know this is silly, but i took the vacume off the bov, so it wouldn't open, and i got teh flutter sound, but the car was soooo lagy and didn't want to boost past 5psi, the dam thing sucked. Is that what normally happens when you block on teh BOV.

mind you i have connected it back up, it was just being silly.???

My understanding on how a BOV works, is that the pressure helps holds the BOV shut. Hense, when there is no pressure working on the BOV at all, it is like you are introducing a big leak.

  • Replies 70
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

.............. is there any hope for these people.

can just see this scenerio

import car sales man: " i just need you to listen to this recording before you qualify to own a skyline".

tape recording can be heard........ vuuuuuuuuu tu tu tu tu tu

customer: "wow bru's da iz da shickest sound dis side of chapz ay....."

car sales man: "get out of my shop........"

ohh i see so if i just take of the hose to it, then the car will leak boost as the BOV has no way of being held shut, makes sence, learn something new everytime.

My question is, there are so many cars running arround with an BOV but still have flutter, can this be from an external gate, or the BOV being set to tight?

I have read many posts about the flutter, and was wondering, on the weekend was washing Jumbarie 16 and many of their drag cars had flutter, i presume that flutter was bad, but many people have that flutter sound.

ohh i see so if i just take of the hose to it, then the car will leak boost as the BOV has no way of being held shut, makes sence, learn something new everytime.

My question is, there are so many cars running arround with an BOV but still have flutter, can this be from an external gate, or the BOV being set to tight?

I have read many posts about the flutter, and was wondering, on the weekend was washing Jumbarie 16 and many of their drag cars had flutter, i presume that flutter was bad, but many people have that flutter sound.

Thats right, you need to pipe connected no matter what or you'll have a mad leak.

The way people block the stock BOV is putting a metal gasket between the return pipe and the BOV, that way the air gets trapped and has nowhere to go but back through the turbo (not good according to lots) and out the air filter.

ohh i see so if i just take of the hose to it, then the car will leak boost as the BOV has no way of being held shut, makes sence, learn something new everytime.

My question is, there are so many cars running arround with an BOV but still have flutter, can this be from an external gate, or the BOV being set to tight?

I have read many posts about the flutter, and was wondering, on the weekend was washing Jumbarie 16 and many of their drag cars had flutter, i presume that flutter was bad, but many people have that flutter sound.

can be certain that it wasnt the wastegate making that sound....

as for the cars at jambo making that noise..... big compressor + heavy spring on bov = some reversion

as for your normal run of the mill cars that still have a lil bit of reversion, as you said, bov is possible too tight

Edited by drag-on silvia

dose /doʊs/ Pronunciation Key - Show Spelled Pronunciation[dohs] Pronunciation Key - Show IPA Pronunciation noun, verb, dosed, dos·ing.

–noun

1. a quantity of medicine prescribed to be taken at one time.

2. a substance, situation, or quantity of anything analogous to medicine, esp. of something disagreeable: Failing the exam was a hard dose to swallow.

3. an amount of sugar added in the production of champagne.

4. Physics.

a. Also called absorbed dose. the quantity of ionizing radiation absorbed by a unit mass of matter, esp. living tissue: measured in gray or rad.

b. exposure dose.

5. Slang. a case of gonorrhea or syphilis.

–verb (used with object)

6. to administer in or apportion for doses.

7. to give a dose of medicine to.

8. to add sugar to (champagne) during production.

–verb (used without object)

9. to take a dose of medicine.

[Origin: 1590–1600; earlier dos < LL dosis < Gk dósis a giving]

—Related forms

doser, noun.

pidgeon pipe, just gay.

This guy can relate to "Failing the exam was a hard dose to swallow"

and maybe hes got "the dose" haha refer to "5."

Edited by Pauly33GTS-t

If you unplug the vacuum hose (and not plug up the hose) it wont really work because the standard bov's leak, they have a small hole in em underneath therefore introducing a vac leak so you'd really need to block it either with a plate in between the bov and the pipe its screwed onto or put something in between the hose connected to the bov and the return pipe going to the intake pipe. That works well with no leaks but if you don't have it tuned to compensate for the added fuel it throws in the car will start backfiring on ya cos of the AFM. Thats the only thing i don't like about AFM cars... its the shit you get when messing with vented/ blocked bov's.

I reckon 5 mates packed in the back yelling and screaming and throwing half full cans of beer randomly at cars, bikes , pedestrians and small dogs is a far better way of drawing attention to yourself.

Although if you already have that option get a few off duty barmy army members (they don't have much work on right now) to sing a loud and catchy song about how your mates car goes 'dose' from the back seat of the car, even from inside the boot?

gees, I have absolutely no clue what wastegate flutter is supposed to sound like.....all I know is that people with external wastegate goes like.........vrrrooooooooommmmmm WAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!

so could someone clue me in as in what the flutter is supposed to sound like?.....all the flutters I've heard is from fully sik bro's and their blocked off bov

mythbusters ahoy >_<

#1 there is no such thing as wastegate flutter

#2 flutter or chop chop (vl style tutututututu) is air pressure collisions in the pipework, as a result of compressor surge, as a result of running no bov

#3 a wastegate making a "vrrrooooooooommmmmm WAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHH" noise is a sreamer pipe setup, nothing to do with compressor surge, bovs, flutter etc.

#4 compressor surge occurs when pressure past the compressor wheel exceeds what the map dictates, so if you goes beyond that, the wheel surges violently

#5 when you block the bov, on gearchange the pressure collision causes the compressor wheel to surge, as we know #4 happens when pressure past the wheel goes beyond what the wheel can supply, so by blocking the bov, you induce compressor surge

gees, I have absolutely no clue what wastegate flutter is supposed to sound like.....all I know is that people with external wastegate goes like.........vrrrooooooooommmmmm WAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!

so could someone clue me in as in what the flutter is supposed to sound like?.....all the flutters I've heard is from fully sik bro's and their blocked off bov

Yep gotta agree there, to scare ppl....hmm 38mm external gate with a 10" pipe comming off it.....

vrrrooooooooommmmmm WAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!! ppl running holding there ears....nothing like it

Yep gotta agree there, to scare ppl....hmm 38mm external gate with a 10" pipe comming off it.....

vrrrooooooooommmmmm WAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!! ppl running holding there ears....nothing like it

to be honest I find it pretty gay........not as gay as vl with their tutus........not my cup of tea

I reckon 5 mates packed in the back yelling and screaming and throwing half full cans of beer randomly at cars, bikes , pedestrians and small dogs is a far better way of drawing attention to yourself.

Although if you already have that option get a few off duty barmy army members (they don't have much work on right now) to sing a loud and catchy song about how your mates car goes 'dose' from the back seat of the car, even from inside the boot?

LOLL Its true its just for attention.... no better way to get noticed than dirving around with a tutututut noise comin from your car...

Guest
This topic is now closed to further replies.



  • Similar Content

  • Latest Posts

    • There's plenty of OEM steering arms that are bolted on. Not in the same fashion/orientation as that one, to be sure, but still. Examples of what I'm thinking of would use holes like the ones that have the downward facing studs on the GTR uprights (down the bottom end, under the driveshaft opening, near the lower balljoint) and bolt a steering arm on using only 2 bolts that would be somewhat similarly in shear as these you're complainig about. I reckon old Holdens did that, and I've never seen a broken one of those.
    • Let's be honest, most of the people designing parts like the above, aren't engineers. Sometimes they come from disciplines that gives them more qualitative feel for design than quantitive, however, plenty of them have just picked up a license to Fusion and started making things. And that's the honest part about the majority of these guys making parts like that, they don't have huge R&D teams and heaps of time or experience working out the numbers on it. Shit, most smaller teams that do have real engineers still roll with "yeah, it should be okay, and does the job, let's make them and just see"...   The smaller guys like KiwiCNC, aren't the likes of Bosch etc with proper engineering procedures, and oversights, and sign off. As such, it's why they can produce a product to market a lot quicker, but it always comes back to, question it all.   I'm still not a fan of that bolt on piece. Why not just machine it all in one go? With the right design it's possible. The only reason I can see is if they want different heights/length for the tie rod to bolt to. And if they have the cncs themselves,they can easily offer that exact feature, and just machine it all in one go. 
    • The roof is wrapped
    • This is how I last did this when I had a master cylinder fail and introduce air. Bleed before first stage, go oh shit through first stage, bleed at end of first stage, go oh shit through second stage, bleed at end of second stage, go oh shit through third stage, bleed at end of third stage, go oh shit through fourth stage, bleed at lunch, go oh shit through fifth stage, bleed at end of fifth stage, go oh shit through sixth stage....you get the idea. It did come good in the end. My Topdon scan tool can bleed the HY51 and V37, but it doesn't have a consult connector and I don't have an R34 to check that on. I think finding a tool in an Australian workshop other than Nissan that can bleed an R34 will be like rocking horse poo. No way will a generic ODB tool do it.
    • Hmm. Perhaps not the same engineers. The OE Nissan engineers did not forsee a future with spacers pushing the tie rod force application further away from the steering arm and creating that torque. The failures are happening since the advent of those things, and some 30 years after they designed the uprights. So latent casting deficiencies, 30+ yrs of wear and tear, + unexpected usage could quite easily = unforeseen failure. Meanwhile, the engineers who are designing the billet CNC or fabricated uprights are also designing, for the same parts makers, the correction tie rod ends. And they are designing and building these with motorsport (or, at the very least, the meth addled antics of drifters) in mind. So I would hope (in fact, I would expect) that their design work included the offset of that steering force. Doesn't mean that it is not totally valid to ask the question of them, before committing $$.
×
×
  • Create New...