Open NEck / Closed Neck ????!!!!!!
15 October 2003, 09:09 AM
#1
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Hey All
Just wundered whats this all about!?
i getting a hks downpipe for my MY93 wrx and it a closed neck.
I heard that this closes off the wastegate?!? whats this going to do to the wastegate, will it run ok or damage it in the long run?
Or hav i heard wrong and im worrying about nothing!?
Help!!!!!
Thanks in advance......
Just wundered whats this all about!?
i getting a hks downpipe for my MY93 wrx and it a closed neck.
I heard that this closes off the wastegate?!? whats this going to do to the wastegate, will it run ok or damage it in the long run?
Or hav i heard wrong and im worrying about nothing!?
Help!!!!!
Thanks in advance......
15 October 2003, 09:15 AM
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It won't do anything to the wategate or damage anything.
The OEM downpipe is closed neck also.
What happens is that when your wastegate opens the gases coming out have to do like a 90 degree turn straight into the flow of gases from the exhaust. This obviously creates turbulence and disturbs flow.
The open neck is less of a "brick wall" to the flow and gives the wastegate gases more of a smooth path to join with the normal exhaust and thus (in theory) creates less back pressure.
Don't expect an extra 40bhp from going open neck
but it should make a slight difference
Rich
The OEM downpipe is closed neck also.
What happens is that when your wastegate opens the gases coming out have to do like a 90 degree turn straight into the flow of gases from the exhaust. This obviously creates turbulence and disturbs flow.
The open neck is less of a "brick wall" to the flow and gives the wastegate gases more of a smooth path to join with the normal exhaust and thus (in theory) creates less back pressure.
Don't expect an extra 40bhp from going open neck
but it should make a slight differenceRich
15 October 2003, 09:44 AM
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nice 1 rich my heart has slowed down now, thought i'd dropped a rite b0///cK!!
However will it make much difference in performance - yeh i know usual question!!
There is already ajap system on it which has taken out the second cat! but they put in an extra 'expansion' section before it goes to the back box - weirdo's and it seems a very quiet system, difficult to here the scooby rumble!
Think the d/pipe will make it sound better!?!
However will it make much difference in performance - yeh i know usual question!!
There is already ajap system on it which has taken out the second cat! but they put in an extra 'expansion' section before it goes to the back box - weirdo's and it seems a very quiet system, difficult to here the scooby rumble!
Think the d/pipe will make it sound better!?!
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