making a screamer pipe

[Mr J.T]

at the moment my exhaust from the wastegate is going back into the exhaust. will it be as simple as chopping the pipe before it gets back in and welding the exhaust pipe to cover the hole?

will this effect the "flutter" i get from the waste gate
and has this got any negative effects apart from flames under the car

cheers jon :3gears-rh

[MikeLMR]

negative ... they are VERY VERY loud !

[Brett]

Yeah, ask CLive what the yellow one was like....

[BlitzBoy]

if want the flutter type rally noise like I had disable your BOV/dump valve then you will get the compressor surge noise

[CraigN]

yeap noise
very loud is not the word

the sound is emotional and that was on my mates toyota Starlet on a big turbo i can imagine the MOT tester and the police would not approve.

but then the MOT man should not be bringing it on boost so...

[vxer]

if want the flutter type rally noise like I had disable your BOV/dump valve then you will get the compressor surge noise

At the risk of opening a huge vat of worms:

*) Does this destroy your compressor wheel?

*) Does it introduce more lag though stalling the turbo?

(runs for cover)

Cheers, Paul.

edit: i\'m really a fan of that noise, despite my best attempts not to be  :yes

[Grizzly]

Well i\'ve run a HKS TO4R with and without a BOV. TBH i did\'nt feel alot of diffrence but it made a lets say diffrent Noise Its suposed to stall the Turbo and take longer to respool but the diffrence in responce with the Bov was nothing to shout about!!

This question has come up a few time so i did a bit of reading up when i removed my BOV from my T2, Basicly if you have a Good Turbo (big shaft T4 etc) rather than your Cheap Ebay Turbo you can easy run without a BOV but if you run a Stock or Cheap Turbo without there is storys of it shearing the Drive shaft of the Turbo.

But i ran mine for a year without problems and tbh i would do it again as it sounds Cool as F**k.

[MikeLMR]

a surge is quite a violent event for a turbo, the thrust on the bearings is quite likely to be reversed (thrust bearings tend to be biased to work best in the direction of normal thrust) + the shock loadings and reverse in torque. As people have said it will work, but will it last as long as one that has some means of preventing the surge ?

[CraigN]

I maybe waffling a load of tosh but from my experience with cosworths and tuning them i know the following.

On a cossie the old skool style turbos T3,T34,T4 etc have older style bearings and on running without a BOV below 400bhp was not really a problem.

People also used to speak of BOV that became faulty could also cause the turbo to overspool meaning it ran far to fast. But i dont know much about that.

Anything over 400bhp meant over 2bar of boost so running without a BOV would reduce the life of your turbo significantly.

On the newer GT series turbos with there fancy ball bearings i have seen snapped shafts caused by not running a BOV, a GT35 turbo on a cossie with 2.5 bar of boost and no BOV was a no no.

The sound is awesome tho. i have a video of me doing the nurburging (i used no BOV on my cossie) and the "chatter" sounds awesome.

[Jonathan_F]

I maybe waffling a load of tosh but from my experience with cosworths and tuning them i know the following.

On a cossie the old skool style turbos T3,T34,T4 etc have older style bearings and on running without a BOV below 400bhp was not really a problem.

People also used to speak of BOV that became faulty could also cause the turbo to overspool meaning it ran far to fast. But i dont know much about that.

Anything over 400bhp meant over 2bar of boost so running without a BOV would reduce the life of your turbo significantly.

On the newer GT series turbos with there fancy ball bearings i have seen snapped shafts caused by not running a BOV, a GT35 turbo on a cossie with 2.5 bar of boost and no BOV was a no no.

The sound is awesome tho. i have a video of me doing the nurburging (i used no BOV on my cossie) and the "chatter" sounds awesome.

Post that vidoe!!!    :burnout  :cool

[Grizzly]

Why not just fit an Anti surge compressor cover? They sound cool too:)

[Mr J.T]

Well i\'ve run a HKS TO4R with and without a BOV. TBH i did\'nt feel alot of diffrence but it made a lets say diffrent Noise Its suposed to stall the Turbo and take longer to respool but the diffrence in responce with the Bov was nothing to shout about!!

This question has come up a few time so i did a bit of reading up when i removed my BOV from my T2, Basicly if you have a Good Turbo (big shaft T4 etc) rather than your Cheap Ebay Turbo you can easy run without a BOV but if you run a Stock or Cheap Turbo without there is storys of it shearing the Drive shaft of the Turbo.

But i ran mine for a year without problems and tbh i would do it again as it sounds Cool as F**k.

same as you grizzly. i dont run a BOV and ive got a T04R its on full spool by 4.5
so by the sounds of this the hacksaw\'s coming out and i get my chainsaw rasp i want

[Ricco_04]

Had the turbo off my mates car on the weekend (well I did most of the watching!  :Giggle )

It\'s the Garret series BB tubbie running at only 0.9bar with no dump valve at all.  It was like this since installing and has done abut 8000 miles (so not enough to really test to be honest) and has identical play to one off the shelf.

Don\'t forget, the WRC guys run with out BOV because they say it makes better response (ie : you are not removing the entire air in the system and at high revs turbo\'s spool back pretty quickly, it\'s more advantageous the bigger IC you have)  They also use anti lag though.  Personally I would always use a dump valve

The screamer pipe is illegal but very few mot guy\'s really say anything & the old bill just get to hear the car on idle when they pull you up  :p  

It should be a case of blocking up the hole and safely redirecting the pipe.  Can\'t think of any other issue\'s off the top of my head?

[Mr J.T]

hacksaw comes out weekend then!:)

[kev-yorks]

Go screamer! As for the old bill there hardly likley to look under your car to see whats there and there arn\'t any noise limits for cars as such in this country anyway, about all they can do is give you a ASBO.
Kevin