homemade decat

1. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

   #1 16th February 2011, 15:38

   hello chaps ive got a home made decat lying around and was wondering if it would work on my saxo?
   its mild steel and the bore measures 2 and a half inches would it be as good as a proffesionally made 1?
   
   cheers all
   
   
2. RustySkull Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0

   #2 16th February 2011, 15:40

   Decat? Looks like a strange backbox lol.
   
   I made me old system...
3. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

   #3 16th February 2011, 16:12

   i know lol found it in the shed so fort i mite put it to use seems alrite just needs 2 flanges welding to it
4. iluminusbutterfly Established Member Joined: Nov 2007 Posts: 1461

   #4 16th February 2011, 16:25

   a decat is just a straight bit of pipe that is shaped to fit in the gap
5. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

   #5 16th February 2011, 16:27

   i know mate im just wondering if this is eny good compared to a sportex or janspeed cus of the cheap welds and what not
6. RustySkull Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0

   #6 16th February 2011, 16:41

   Quote:

   Originally Posted by performanceparts2011 i know mate im just wondering if this is eny good compared to a sportex or janspeed cus of the cheap welds and what not

   Cheap welds? As long as there is no holes in them they're fine, it's not as if they have to hold any weight
7. LeeM Saxperience Post Whore Joined: Feb 2008 Liverpool Posts: 7393 Black Corsa C SRi

   #7 16th February 2011, 16:45

   That really won't fit
8. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

   #8 16th February 2011, 21:13

   there all solid so no air leaks, and why wont it fit if i weld flange plates on to marry it up to downpipe and centre section?
9. philliantkr Regular Poster Joined: Sep 2009 Birmingham Posts: 414 Citroen Saxo VTR (2000)

   #9 16th February 2011, 21:24

   Because it's too big just buy a proper pipe :l
10. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

    #10 16th February 2011, 21:29

    yeah but the centre bore is also 2 and a half inches?
11. AL3X_ Established Member Joined: May 2010 Posts: 1434

    #11 16th February 2011, 21:30

    A proper one designed for a saxo will more likely do the job better, if the diameter of the pipe is too big it may decrease performance, this is because of the time it will take the gases to fill the extra area of pipe or something.
12. RustySkull Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0

    #12 16th February 2011, 21:33

    Quote:

    Originally Posted by AL3X_ A proper one designed for a saxo will more likely do the job better, if the diameter of the pipe is too big it may decrease performance, this is because of the time it will take the gases to fill the extra area of pipe or something.

    Basically a loss of back pressure is possible.
13. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

    #13 16th February 2011, 21:34

    Quote:

    Originally Posted by AL3X_ A proper one designed for a saxo will more likely do the job better, if the diameter of the pipe is too big it may decrease performance, this is because of the time it will take the gases to fill the extra area of pipe or something.

    yeah i will eventually be vts'ing it so im keepin costs down for now, i would imagine its roughly the same diameter as my sportex centre section?
14. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

    #14 16th February 2011, 21:35

    Quote:

    Originally Posted by Bikekid450 Basically a loss of back pressure is possible.

    yeah i had that on an Rs,
15. RustySkull Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0

    #15 16th February 2011, 21:50

    Quote:

    Originally Posted by performanceparts2011 yeah i had that on an Rs,

    Some engine's work better with no exhausts at all, but others just loose all power, The old beetle Engines liked having no exhausts, they was like an air pump lol.
16. LeeM Saxperience Post Whore Joined: Feb 2008 Liverpool Posts: 7393 Black Corsa C SRi

    #16 16th February 2011, 22:07

    2.5" when the rest is 2.25 will possibly drain power, and it's not shaped properly
17. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

    #17 17th February 2011, 00:47

    yeah theres very little difference in dimensions 2 my centre section and its not bulged internally its the same size end 2 end so with abit of luck it'll do for a month or 2
18. gavmc88 Frequent Poster Joined: Dec 2010 Aberdeen Posts: 835 Wee Saxo 1.1

    #18 17th February 2011, 01:04

    My Cousin made homemade straight through out off Scaffolding haha was absolutely crazy backfiring like mad only had it on for a week people were jumping when he was goin along the town haha
19. user_28362 Saxperience Post Whore Joined: Nov 2008 Posts: 5306 911 Turbo

    #19 17th February 2011, 06:57

    The bore is a bit big
20. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

    #20 17th February 2011, 13:46

    Quote:

    Originally Posted by gavmc88 My Cousin made homemade straight through out off Scaffolding haha was absolutely crazy backfiring like mad only had it on for a week people were jumping when he was goin along the town haha

    haha love it mate
21. performanceparts2011 Frequent Poster Joined: Feb 2011 bromsgrove Posts: 580

    #21 17th February 2011, 13:48

    well ive just put it up for sale and theres a bloke meant to be collecting it this week for his type R so ill probly get a sportex decat once ive sold a few more of my old spares