screamer pipe

[[RPM]]

anybody using one?
i think the downpipe flow will be better and we get the Group B sound

[Jamo]

It's very loud though, you need to put a silencer on it or you can't drive at night!

[[RPM]]

but it will only be loud when you it the max boost and the waste gate opens right?
most of the time will be closed
in normal driving i never hit 1.4bar

[Bram]

I had one on my Avant with a silencer from an Opel Corsa. It's not too loud, so if you can DO IT, since the sound is mental:

http://www.youtube.com/watch?v=lIxLx3zzpHs

[[RPM]]

any pics of screamer setup's?

[Jamo]

but it will only be loud when you it the max boost and the waste gate opens right?
most of the time will be closed
in normal driving i never hit 1.4bar

It will open anytime you boost over the spring pressure.

If it's a stock spring then 0.4 bar

[Billman]

Don't think so! It will open at 0.4 only if the n75 is disconnected. It will scream only when the ecu trust to controll boost.

[HMS-S6]

Don't think so! It will open at 0.4 only if the n75 is disconnected. It will scream only when the ecu trust to controll boost.

That was my understanding too. Although i don't see the point/advantage to having one to be honest . . . . . .

[Bram]

any pics of screamer setup's?

Sure:

http://www.s2forum.com/forum/showpost.php?p=440899&postcount=311

[Jamo]

Don't think so! It will open at 0.4 only if the n75 is disconnected. It will scream only when the ecu trust to controll boost.

The N75 stops the wastegate from opening when your under WOT - Wide Open Throttle only on the S2 stock ecu.

Not at WOT wastegate sees boost, this is why when you have a faulty N75 valve you don't get boost

[prj]

Don't think so! It will open at 0.4 only if the n75 is disconnected. It will scream only when the ecu trust to controll boost.

I recommend looking at N75 signal with an oscilloscope before making such statements.
N75 is not "open" or "closed", it is always oscillating, even when it is below target, it is oscillating. Yes, the duty goes to 95%, but it still oscillates to be able to respond faster.

The N75 stops the wastegate from opening when your under WOT - Wide Open Throttle only on the S2 stock ecu.

Not at WOT wastegate sees boost, this is why when you have a faulty N75 valve you don't get boost

Completely wrong as well, boost is mapped based on TPS value and RPM. Less TPS value - less boost requested. But this does not mean that you don't get above spring pressure on part throttle.

[[RPM]]

Sure:
http://www.s2forum.com/forum/showpos...&postcount=311

nice

[Billman]

I recommend looking at N75 signal with an oscilloscope before making such statements.
N75 is not "open" or "closed", it is always oscillating, even when it is below target, it is oscillating. Yes, the duty goes to 95%, but it still oscillates to be able to respond faster.

Oh yes, I am ordering one right now!!! Wait.... :-p

Dude, let the "how does Motronic work" manual and read carefully please. I said the wastegate opens not the n75.

[S2central.net]

The N75 valve is modulated by the ECU... in turn the wastegate valve is modulated - so sure its not a binary open/shut thing... I've been out in one S2 with an unsilenced screamer pipe and the sound is proper bonkers - very 'S1' like as this one had over 400bhp at the time. The scream pipe made all sorts of farty noises at part throttle of course - once boost starts to build you will hear it... doesn't develop into that lovely scream unless on full chat.

[[RPM]]

The N75 valve is modulated by the ECU... in turn the wastegate valve is modulated - so sure its not a binary open/shut thing... I've been out in one S2 with an unsilenced screamer pipe and the sound is proper bonkers - very 'S1' like as this one had over 400bhp at the time. The scream pipe made all sorts of farty noises at part throttle of course - once boost starts to build you will hear it... doesn't develop into that lovely scream unless on full chat.

I've just wet myself

screamer pipe added to "the things to do " to my S2