doseing legnum? (turbo flutter)

[Guest]

i know there are a few different opinions on turbo flutter

1 being its no good for your turbo as it is making it spin in reverse to vent extra boost pressure when you take your foot off the throttle instead of going through a bov

or

2 being yes its not that good for your turbo but it can handle that sort of punishment... also it sounds real cool


i have tried getting turbo flutter by removing my bov and blocking the pipe where it attaches, then tested, the excess pressure does come back through the turbos and back out the air filter, but no noise (just a gush of air)

so i removed the air filter to see if that was silencing it, to which i found i was getting that cool sound, but still not loud enough to hear very well,

could it be that due to the nature of the standard piping between the air filter and the turbos is that restrictive that it blocks the noise out (even tho i get awesome spooling noise because of exhaust work) of is it just the turbos are phisically too small to flutter any louder even tho i am running 14psi of boost

 

[bradc]

I'm with option 2. A lot of evo's run without a bov and they don't blow up. Our turbo wheels are very small and don't create huge forces on the shaft. In saying that the shaft on a TD03 is quite small. I do think that if you are worried about your stock BOV leaking, it is perfectly fine to remove it and block it up temporarily to see if your turbo's hold boost better for example.

 

[Scottie]

It will be really hard to get flutter with the soft piping that the Legnums come with.

If you want good flutter, get a hardpipe kit, change the piping going from the turbos right up to the MAF or even remove the MAF if you have an ECU that will let you. Corrugated piping (Vacuum Hose) will lessen the effects of flutter.

 

[Skurfer]

Are you a 12 year old kid or something. I really dont know anyone that is impressed by that sound other than school children, or wankers. What is the point. You want to slow your compressor wheel down to get some wanky noise, to the effect that you will have to spool it back up again in the next gear. Run a plumb back BOV which will actually doing something for the performance of the car. Why make the car worse.

The turbine never goes in reverse. The sound it the air rushing back past the spinning wheel doing about 250000rpm and basically doing a big skid on the air as it slows down very rapidly, but never enough to go backwards.

 

[frozen]

There is already a 3 page thread on this

 

[Guest]

Are you a 12 year old kid or something. I really dont know anyone that is impressed by that sound other than school children, or wankers. What is the point. You want to slow your compressor wheel down to get some wanky noise, to the effect that you will have to spool it back up again in the next gear. Run a plumb back BOV which will actually doing something for the performance of the car. Why make the car worse.

The turbine never goes in reverse. The sound it the air rushing back past the spinning wheel doing about 250000rpm and basically doing a big skid on the air as it slows down very rapidly, but never enough to go backwards.

for a post like that im asuming you would have to be mentally 8 grow a brain ENOUGH WITH THE PERSONAL ATTACKS GROW THE F#*K UP

i have seen turbos literally stop and change direction with my own eyes so dont tell me it doesnt happen, also there are plenty of cars out there that come standard with no bov or even an intercooler just a straight pipe from turbo to tb so obviously it canot be that bad for the turbo

theres also no difference of having to re spool and come onto boost wether it escapes back through the turbo or out through a bov you still end up with jack shit pressure between the turbo and the tb either way

 

[dimi_108]

Yes, like Josh said there is already a three page thread on this subject. In future, please use the search function.

 

[Skurfer]

Just wondering when you saw the turbos stop and change direction with your own eyes. I would be very interested to see this, as in my experience, i have never seen this to happen, or ever known of it to happen.

Even on idle, the exhaust should be pushing the exhaust side of the impeller on the turbo with enough force and speed to counteract the rapid force applied by the pressure difference of the boosted air that is escaping back past the compressor wheel of the turbo.

I would love to be proven wrong though. would be something very interesting to see for sure.

 

[steveP]

turbo spinning backwards

not going to discuss pro/cons of it.. again.

if u want flutter:
1. pod filter
2. remove/block bov
3. larger intercooler
4. aluminum piping

ive also noticed the actual turbo itself depends heavily on flutter as different sizes and specs will give different noises.

 

[Guest]

Just wondering when you saw the turbos stop and change direction with your own eyes. I would be very interested to see this, as in my experience, i have never seen this to happen, or ever known of it to happen.

Even on idle, the exhaust should be pushing the exhaust side of the impeller on the turbo with enough force and speed to counteract the rapid force applied by the pressure difference of the boosted air that is escaping back past the compressor wheel of the turbo.

I would love to be proven wrong though. would be something very interesting to see for sure.

i think its got something to do with having a real soft wastegate, i try get a vid for u