406 Sri Dump Valve

[lloydgti 0]

Anybody got any advice of what dump valve to buy, ive been looking at the single and twin piston bailey ones and a greddy type s. Anyone got any tips, im after a really beefy whooooosh sound

[bales 1]

Take the standard one out and run without one it sounds much better than a silly whoosh.

[Baz 421]

Yes, compressor stall sounds good, but kills the turbo in quick time...

[bales 1]

Yes, compressor stall sounds good, but kills the turbo in quick time...

 

Not when your sticking 7psi through it...

 

Had no issues with mine whatsoever running it at 1 bar for 2 years on a turbo that had play when I got the engine...

 

High boost fair enough but I wouldn't worry about it if it were me...

[Baz 421]

Ahh yes fair point, they are such low boost engines i guess it's probably not going to do it much harm!

[lloydgti 0]

Yes, compressor stall sounds good, but kills the turbo in quick time...

 

is that the chatter kind of sound? all i got to do is block the plastic boost pipe and leave a hole in the alloy pipe?

[bales 1]

is that the chatter kind of sound? all i got to do is block the plastic boost pipe and leave a hole in the alloy pipe?

 

No you just remove the oem recirc dv and make sure the whole system is sealed or else your boost will be going into the atmosphere and not your engine!

[wracing 19]

Am I the only one that thinks compressor surge is a really bad thing at any boost level?

 

James

[bales 1]

Am I the only one that thinks compressor surge is a really bad thing at any boost level?

 

James

 

Yes, though it depends whether you are talking about 'actual' compressor surge or simply the generic term given to compressor stall.

 

As I'm sure you know (given your knowledge on the subject) compressor surge is very large pressure fluctations caused by running it in the wrong part of the compressor map which has been known to rip large pumps to pieces - I work in the chemical engineering industry btw.

 

I don't think that forcing the oem turbo to stall by not running a dv in this case is particularly severe even over a long time period given that Peugeot themselves didn't run dv's on all of the xu10cj2te engines across the years.

Edited May 6, 2010 by bales

[wracing 19]

When I say surge, I'm talking about flow reversal across the compressor wheel, to reference wikipidea (which i hate doing).

 

Axi-symmetric stall or compressor surge

 

Axi-symmetric stall, more commonly known as compressor surge; or pressure surge, is a complete breakdown in compression resulting in a reversal of flow and the violent expulsion of previously compressed air out through the engine intake, due to the compressor's inability to continue working against the already-compressed air behind it. The compressor either experiences conditions which exceed the limit of its pressure rise capabilities or is highly loaded such that it does not have the capacity to absorb a momentary disturbance, creating a rotational stall which can propagate in less than a second to include the entire compressor.

 

The compressor will recover to normal flow once the engine pressure ratio reduces to a level at which the compressor is capable of sustaining stable airflow. If, however, the conditions that induced the stall remain, the return of stable airflow will reproduce the conditions at the time of surge and the process will repeat.[1] Such a "locked-in" or self-reproducing stall is particularly dangerous, with very high levels of vibration causing accelerated engine wear and possible damage, even the total destruction of the engine.

 

I think it should be avoided at all costs, I know pug didnt bother, but I would!

 

James

[bales 1]

ok

Edited May 6, 2010 by bales

[wracing 19]

Bales has experience of your setup so he right you should get away with it fine!

[bales 1]

Though for piece of mind or if you want to increase the boost its probably safer to use one if it is a daily driver, mine wasn't so it was never a massive problem if anything did happen.

 

Edited - oh and by the way this is what they sound like without a dv;

 

no dv

Edited May 6, 2010 by bales