Technical Forums» Technical / Performance» Cleaning out the CAT
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Glenj » CMF Member manchester United Kingdom Member since:  Posts:  |
Cleaning out the CAT |
Tue 12 Feb 2013 11:16:22 PM |
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Hi guys just wondering if this would have any benefit to performance, iam assuming it will due to air flow, just wondering what thoughts you guys have,
Pics shows the honeycomb cleaned out of the CAT that meets the manifold |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Tue 12 Feb 2013 11:18:59 PM |
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another pic
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Tue 12 Feb 2013 11:19:00 PM |
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another pic
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RTK » CMF Member Australia Member since: Posts: |
Re: Cleaning out the CAT |
Tue 12 Feb 2013 11:23:49 PM |
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you will lose back pressure!
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Tue 12 Feb 2013 11:30:01 PM |
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In what way bud, sorry forgot to explain this is for a grass track car so will be revving the nuts out of it
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 01:57:09 AM |
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RTK WROTE: "you will lose back pressure! " heh, the old back pressure myth :) what downpipe do you run glen ? |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 04:02:18 AM |
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Will just be the standard 1 bud, a buddy of mine give me this to try thought i would ask if it would benefit me first, but ahh well from what i have read elsewhere, its going on :)
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 04:07:23 AM |
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i doubt if the stock peashooter downpipe flows half as well as the cat tbh glen (and this is the front/bigger end of the d/p :)
some legitimate flow figures would be interesting tho |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 04:25:38 AM |
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so your thoughts are keep with the cat intact?, still got my orginal one just need to drill the bolts out and stick back on. Iv no idea on how to get any figures bud :)
Was also looking to replace the other with a straight piece of pipe |
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 04:47:20 AM |
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dunno tbh mate, you have created a big void prior to the downpipe, (maybe helps, maybe hinders ??)
i think i would fit a pipe inside the void to maintain flowrates personally (i fitted a perforated tube into my n/a mani/cat, to try and lose some decibels) the 2nd cat exits at about 60mm iirc, then hits a flat plate/flange with a much smaller hole in the middle, that cant be good for flow, so maybe re-design that area eh :) or else fit a coilpack (post 2000) middle section (those have no 2nd cat) |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 05:08:05 AM |
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Yeah see what your saying bud, will play around see what happens, or else fit a coilpack (post 2000) middle section (those have no 2nd cat)" Would this need cutting to size or straight swap for cat |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 05:08:06 AM |
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Yeah see what your saying bud, will play around see what happens, or else fit a coilpack (post 2000) middle section (those have no 2nd cat)" Would this need cutting to size or straight swap for cat |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 05:08:07 AM |
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Yeah see what your saying bud, will play around see what happens, or else fit a coilpack (post 2000) middle section (those have no 2nd cat)" Would this need cutting to size or straight swap for cat |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 05:08:08 AM |
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Yeah see what your saying bud, will play around see what happens, or else fit a coilpack (post 2000) middle section (those have no 2nd cat)" Would this need cutting to size or straight swap for cat |
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 05:14:04 AM |
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aye, the longer coilpack middlepipe is a direct fit mate, just bolt the flanges together (some brands have an integral silencer built in)
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 05:20:32 AM |
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will look into it cheers bud
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Wallie » CMF Member Adelaide Australia Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 11:16:34 AM |
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interesting read. so the post 2000 only have 1 cat? does the coil pack replace the 1 just below the manifold or the 1 under the car? and is there any significant difference?
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Wed 13 Feb 2013 06:26:29 PM |
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Wallie WROTE: "interesting read. so the post 2000 only have 1 cat? does the coil pack replace the 1 just below the manifold or the 1 under the car? and is there any significant difference? " its a deeper primary cat wallie, with a slightly shorter mani and downpipe, when i compared the 2 the later one had finer pores in the core too |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Thu 14 Feb 2013 03:57:28 AM |
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ok managed to get on today despite the snow :( i missed out putting the springs in for now, was getting to cold and bloody annoying (do i need these) there was a bit of smoke coming off/out of the cat (crap probably burning up)
Did sound a bit dull today, could putting this part on cause this? (including a link to vid for you to listen not to sure if the quality is good enough tho) Cheers http://www.youtube.com/watch?v=geyAfdN_62U&feature=youtu.be |
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Thu 14 Feb 2013 04:39:02 AM |
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sounds fine to me glen :)
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Thu 14 Feb 2013 05:19:03 AM |
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you think bud? you reckon try the other back on and see or will you be only able to tell on a dyno
Hmmm whats next :) |
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Thu 14 Feb 2013 05:40:40 AM |
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Glenj WROTE: Hmmm whats next :)" flywheel ? is your speed sensor disconnected ? or disconnect the lambda ? or disconnect the coolant sensor at full throttle maybe ? |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Thu 14 Feb 2013 05:48:47 AM |
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cant do anything to flywheel bud
Speed sensor- where is this? disconnect lambda- What am i hoping for here? and again sorry- where is coolant sensor and what will this do, also is this a good idea if the car is at full throttle in 2nd gear for 2mins Cheers |
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frank2 » CMF Member birmingham United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Thu 14 Feb 2013 06:16:53 AM |
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there should some threads on here and MSC about the speed sensor wire and how it over-rides the closed looping of the ecu mate, and ecu,s usually run from the basemap if there is no lambda feedback (safer/richer mixtures).
and one of my dyno printouts on here shows me doing a run with the coolant temp sensor disconnected, giving a (coldstart) constant 13:1 fuel ratio as a result these are things that you could try out |
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Glenj » CMF Member manchester United Kingdom Member since: Posts: |
Re: Cleaning out the CAT |
Thu 14 Feb 2013 06:29:01 AM |
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food for thought cheers bud
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