Jump to content
SAU Community

FLUTTER sound as BOV


ATTN

Recommended Posts

in conclusion, they aren't that bad for your turbo as evidenced by the many workshops that do it to their cars, however, no skyline enthusiast with half a brain would do this to their car for fear of being mistaken for one of the stereotypical losers that actually do do this to their cars to make them sound 'fully sick' as that is purely not what driving a skyline is about.

my 2c

Link to comment
Share on other sites

  • 2 months later...
  • Replies 300
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

IT DOESNT MATTER....

Compressor surge does jack crap to your turbo... it wont "blow it up", your turbo is working harder compressing the air than coming offboost.

Please get a timing light with any car running a high-mount on a dyno, and SEE what happens to the compressor blades when the "big bad cooler noise" happens... haha yeh man... the turbo blades stop/start spinning backwards.. haha.

FFS stop reading useless advertising crap off of the turbosmart F.A.Q

One of my best freinds (drives a straight gas VL turbo GAS-747) runs a 10.80 all day/daily driver, runs 30PSI driving over 2 years without ANY problems with the turbo at all. (GT40)

Look at most sub 10 sec turbo VLs... what a suprise... no re-circ B.O.V.

Really as posted above, its horse's for courses. Whatever you prefer, i have NEVER heard of a turbo destroying itself through compressor surge and if it was such a major issue for turbo reliability most TOP STREET drag cars would be running them. (Bres, rajab come to mind)

if your after turbo reliabilty, run a R34 NEO or GTR oil & water pump... that will save your turbo before a BOV. But whatever floats your boat mate! :D

Cheers,

Trev

Link to comment
Share on other sites

i had a ssq bov on the car when i bought mine, and it must of been adjusted to tight, and the ssq sound i was hearing was flutter, but i was none the wiser as i thought it was the ssq, i only found out due to i bought a greddy type s (knock of) and put it on and it also was to tight and was still making the flutter, played around with it for a while and still can not get rid of the flutter, i got a high flow turbs but f_&* knows whats goin on, maybe cos they were both cheap knock ofs, the flutter has done no damage to my turbs though, ..oh well thats my rant

Link to comment
Share on other sites

this coming from a man who has a BOV on his R32?

very amusing...

no.... the BOV was removed because its useless just gets cops attention and book your ass.

If you run a BOV just leave the standard one. But when you go serious power remove the BOV>!

I was under the impresion that no bov was louder than having one? Thus less attention for a factory fitted item. <_<

Link to comment
Share on other sites

i had a ssq bov on the car when i bought mine, and it must of been adjusted to tight, and the ssq sound i was hearing was flutter, but i was none the wiser as i thought it was the ssq, i only found out due to i bought a greddy type s (knock of) and put it on and it also was to tight and was still making the flutter, played around with it for a while and still can not get rid of the flutter, i got a high flow turbs but f_&* knows whats goin on, maybe cos they were both cheap knock ofs, the flutter has done no damage to my turbs though, ..oh well thats my rant

took it apart and it had 2 springs in it, i would say a high and low boost spring in it, kept the soft spring in it as only runnin 9psi and hopefully stops reversion,

Link to comment
Share on other sites

IT DOESNT MATTER....

Compressor surge does jack crap to your turbo... it wont "blow it up", your turbo is working harder compressing the air than coming offboost.

This is correct. Plumback BOV's were fitted on skylines for emmission control...

I think they are alright. They're one of the reasons I like turbos...

My 2 bob.

Link to comment
Share on other sites

I haven't looked in to it enough, but the way I see it when you've got compressor surge you're applying a force to the blades that it otherwise wasn't designed to take.

The force itself might not be as strong as when the turbo is on-boost, but the compressor wheel is designed to take load in that direction.

Link to comment
Share on other sites

I haven't looked in to it enough, but the way I see it when you've got compressor surge you're applying a force to the blades that it otherwise wasn't designed to take.

The force itself might not be as strong as when the turbo is on-boost, but the compressor wheel is designed to take load in that direction.

The air might flow a different way but the force is in the same direction.

Link to comment
Share on other sites

This is correct.  Plumback BOV's were fitted on skylines for emmission control...

I think they are alright.  They're one of the reasons I like turbos...

My 2 bob.

How does fitting a BOV correct emissions? The standard skyline bov's simply recircluate back into the intake system. Without a bov the air is still in the same location. I don't see how it "helps emissions". The BOV is simply there to prevent compressor surge when the throttle body is closed

Link to comment
Share on other sites

How does fitting a BOV correct emissions? The standard skyline bov's simply recircluate back into the intake system. Without a bov the air is still in the same location. I don't see how it "helps emissions". The BOV is simply there to prevent compressor surge when the throttle body is closed

Well....

The air in the plumbing has to go somewhere right?

It goes back out of the turbo (surge) and into the atmosphere, passing the airflow meter on the way which read some airflow and the ecu pumps fuel through your injectors giving you a black puff of smoke.

If you have an atmo BOV, the turbo keeps sucking air and the air flow meter reads the air - etc.. see above for the rest.

A plumback keeps the air circulating through the plumbing,after the airflowmeter, the aflowmeter doesn't register any airflow and there is no polution.

Link to comment
Share on other sites

well the stock bov noise on my rb25 was pissing me off, so i made up a metal gasket blocked it off, and now my car flutters, i only run 10psi and so far no damge, and it dosnt really slow the turbo down at high revs when making boost

Link to comment
Share on other sites

Guest
This topic is now closed to further replies.



  • Similar Content

  • Latest Posts

    • I'm struggling with a similar issue on an RB26. Make sure you know whether it's volume or resonance. Mine seemed louder when cruising compared to at idle. I downloaded a decibel meter for my phone. Take my less than scientific results with a couple grains of salt, but the decibels were the same at idle and at cruise. Mine seems to be a resonance problem. At 2500-3500 rpm, the sound is different and "louder" to my ear. I think it's vibration from the pipe, the car body, the floor or something creating tone. Anyway, consider that it may not be strictly a volume problem.
    • Does this count as a time trial as well? I got all gold in the master super licence (1 lap time trial) and received a McLaren MP4/4 for my trouble.  If anyone else has done this, did you ride the wall right around the first long right hander at Lake Louise snow track to get gold? I couldn't do it any other way... best I could do without riding the was was within 2 tenths of the gold time.
    • I definitely get the low power, sporty car to drive to smash gears but not be doing eleventy million miles an hour! It makes all the normal drives fun!   Rev match tune sounds like the funs! I didn't know the NC had a DBW throttle!   As for me, still have the Skyline, it still has the Barra in it. It's been pushed to the side of the workshop at the moment. Pretty much waiting on me finishing the wiring, and dropping new fuel lines in. Got myself an ACDC Tig end of last year so been teaching myself TIG welding to build a few things for the Skyline. The missus wrote off her GTB liberty at the end of last year, and got it back on salvage rights stupid cheap. It's also still registered, so will mean easier for me to take to the track already done most of the panel damage, just playing "clear the workshop" to make space to pull the motor and box out, fix some oil leaks, replace the clutch, and replace a few minor broken things.  Also got a Lathe at the start of the year, which is adding to the annoyance of no space, which is another reason I'm trying to build things to get more space, to get the Lathe back in a final home for it. It's a BIG lathe, can turn a 355mm diameter, and 1metre between centres... Got it at a steal! So between it and the TIG and old MIG welder, I'll be fabbing some fun little shit up But we've had a lot of shit stuff happening at home, so it's slow going getting things done. But one step at a time!
    • I love Catalunya.  Got a 1:54.632. The AMG is a hoot.
    • I hadn't got that far, my main worry was the connection to the actual calipers themselves. I'm just using new (ish) stock brake lines in the stock setup. I've just had a stud welded to the knuckle that is a little lower than the original stud (so my knuckles have two studs each side) to not have it be stretched so far in previous BBK setups, so the "block" (in the second picture) mounts a little lower for me and I hope I don't need to change anything. I may have even changed the connection to the calipers in the past and have since forgotten I did that. I may not have. Guess how I'm gonna find out. Source: hopium
×
×
  • Create New...