Is It Best To Have Bov Loose Or Tight?

[JBFG]

The intake I have in now gives the pchhhh effect..I'm after the flutter or tu tu tu tu sound however you choose to say. Will putting on that bov not achive what I'm after?

Cheers.

[Gasman]

I have the stock Bosch item and a Growler CIA and get heaps of flutter. Also running more than stock boost helps.

Edited 29/12/11 01:39 AM by Gasman

[Dillz]

The intake I have in now gives the pchhhh effect..I'm after the flutter or tu tu tu tu sound however you choose to say. Will putting on that bov not achive what I'm after?

Cheers.

No it won't, for that sound you need to remove the bov or block it up.

[JBFG]

Ok thanks guys. I herd if you block

It up it can fck the turbo...?

[1600dave]

I have a turbosmart kompact, half vented, half plumb back.

Depending on how I drive I get both turbo flutter and bov venting psssch sound.

If you just want flutter do as Dillz said, and no the turbo will be fine. Many people have done it.

Edited 29/12/11 05:26 AM by 1600dave

[getuted]

no the turbo will not be fine, it won't happen straight away but it will eventually fail. the "flutter" is compressor surge, which generates excessive amounts of thrust loading (back and forth movement) which will destroy the thrust bearings surfaces in the turbo and eventually oil seals. We have anti surge valves fitted to all the APU engines on the aircraft at work, basically they are electronically controlled pneumatically operated BOV's to stop the flutter so the jet engines don't crap out as often. These engines are made by Garrett and have similar bearing, compressors and turbines to our turbos, but hey a replacement turbo is only 2000-3500 bucks so why not wreck it.

[Dillz]

In the 4+ years I've been here I can't think of one person that has stuffed a turbo solely because of compressor surge.

In theory it's bad but in reality it very rarely if ever happens on these cars. I think JET engines run a tiny bit more boost then us too..

[getuted]

I stuffed a GT3082r on my s14 in 9 months running it without a BOV with 16 pound of boost. I tried getting it repaired / replaced under warranty which wasn't honoured because it was recommended to me to have a BOV fitted when I had the turbo installed, so I priced up getting it rebuilt but it was $150 cheaper than a new turbo go figure? after having the car off the road for 7 weeks while I saved cash for a new turbo I fitted a turbosmart type 2 bov and the new turbo lasted 145000km and was still boosting strong when I sold the car.

as for jet engine compressor discharge pressure in a typical 737-400 APU its hovers around 28 psi depending on air temp, humidity and fuel density, less then some street cars.

[getuted]

ps not trying to start a slinging match I'm just passing on my knowledge because I've found that almost everyone I've spoken to about it don't actually know whats happening when they here the flutter noise.

[Dillz]

Most people on here do and aren't fazed that much.