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displaying posts 1 to 11 of 11
| Author | Subject: centre section |
 barnettjd77
Regular  Location: dorchester Registered: 12 Nov 2011 Posts: 483 Status: Offline |
Post #1
I had a sportex centre section in today before i changed it to a straight through pipe, so now have a de-cat, scorpion back box and a straight through centre section, it seems a bit less acceleration, is this due to back pressure? or any ideas..any ideas would be appreciated. ________________________________________ A red rallye in progress! |
 Posted 18th Apr 2012 at 20:15
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mattyrallye
Seasoned Pro  Location: gillingham Registered: 02 Nov 2007 Posts: 1,202 Status: Offline |
Post #2
Not sure it could be a back pressure problem. what Dow is the pipe?________________________________________ Previous china gti6 and Rallye owner.Now a proud Astor Gti 6 owner. Missing he BMW already... |
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Posted 18th Apr 2012 at 23:11
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barnettjd77
Regular Location: dorchester Registered: 12 Nov 2011 Posts: 483 Status: Offline |
Post #3
mattyrallye wrote: Not sure it could be a back pressure problem. what Dow is the pipe? Dow? sorry to be a tad thick  ________________________________________ A red rallye in progress! |
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Posted 18th Apr 2012 at 23:12
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owain
Seasoned Pro  Location: Essex Registered: 20 May 2009 Posts: 9,185 Status: Offline |
Post #4
I'm guessing it's a typo as it has a capital. Diameter I'd assume?________________________________________ Membership expiring soon, get in contact on our new little forum project. |
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Posted 19th Apr 2012 at 08:16
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barnettjd77
Regular Location: dorchester Registered: 12 Nov 2011 Posts: 483 Status: Offline |
Post #5
owain wrote: I'm guessing it's a typo as it has a capital. Diameter I'd assume? That's most likely then haha, 3.5 scorpion and a hoffman de-cat looks either 2" or 2.5" ________________________________________ A red rallye in progress! |
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Posted 19th Apr 2012 at 13:47
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monkeyman
Seasoned Pro  Location: Sunny St Albans Registered: 01 Oct 2008 Posts: 1,955 Status: Offline |
Post #6
Std is 2.25 I think, the sportex straight through is 2.5". Should flow a bit better at the top end, but a bit less torque low/mid.________________________________________ Spanner Monkeys Monkey SpannerForum Search Clicky |
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Posted 19th Apr 2012 at 16:01
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barnettjd77
Regular Location: dorchester Registered: 12 Nov 2011 Posts: 483 Status: Offline |
Post #7
I have chucked the sportex centre section and backbox back on, sounds like a bloody fireblade imo but no where near as fast as one  ________________________________________ A red rallye in progress! |
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Posted 20th Apr 2012 at 19:46
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mick1989
Regular  Location: preston Registered: 13 Dec 2010 Posts: 123 Status: Offline |
Post #8
i have devil decat streight through to scorpion backbox lost loadsa back pressure, torque. also very loud, wish i had the standard kit back on! |
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Posted 30th Apr 2012 at 18:51
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barnettjd77
Regular Location: dorchester Registered: 12 Nov 2011 Posts: 483 Status: Offline |
Post #9
mick1989 wrote: i have devil decat streight through to scorpion backbox lost loadsa back pressure, torque. also very loud, wish i had the standard kit back on! I think mine is a devil decat not too sure, but i had a straight through section and was sh*t aswell  I have a right mix up now the decat a sportex centre section and scorpion back box ________________________________________ A red rallye in progress! |
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Posted 30th Apr 2012 at 18:54
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mick1989
Regular Location: preston Registered: 13 Dec 2010 Posts: 123 Status: Offline |
Post #10
would like to try that before i go standard. did the sportex centre section make it much quieter |
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Posted 30th Apr 2012 at 19:13
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barnettjd77
Regular Location: dorchester Registered: 12 Nov 2011 Posts: 483 Status: Offline |
Post #11
mick1989 wrote: would like to try that before i go standard. did the sportex centre section make it much quieter It did make it a lot quieter, though when past like 4k rev giving it some it sounds a lot louder sounds pretty smart tbh. And the pickup/back pressure was much better could notice the difference easily  ________________________________________ A red rallye in progress! |
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Posted 30th Apr 2012 at 19:17
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