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Author Topic: Pre-cat. . . . . REMOVED!  (Read 87911 times)

Offline jon-tfsi

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Re: Pre-cat. . . . . REMOVED!
« Reply #15 on: January 19, 2012, 08:32:41 pm »
A couple more pics :





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Offline sideshowfred

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Re: Pre-cat. . . . . REMOVED!
« Reply #16 on: January 21, 2012, 10:15:40 am »
I'm really keen to do this when the weather warms up. One question though, are there any sensors i have to worry about that might not make it run smoothly??
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Offline GrayMK5GTI

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Re: Pre-cat. . . . . REMOVED!
« Reply #17 on: January 22, 2012, 12:14:00 pm »
Nope  :smiley:

The ECU adjusts to the extra flow of the exhaust and the cooler EGT's and all is well - as long as you don't damage the lambda sensor when removing the pre-cat
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Offline GrayMK5GTI

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Re: Pre-cat. . . . . REMOVED!
« Reply #18 on: January 22, 2012, 01:17:44 pm »
Can also confirm that this mod releases around 6bhp  :star: this was confirmed on the dyno
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Offline GarethB

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Re: Pre-cat. . . . . REMOVED!
« Reply #19 on: January 22, 2012, 02:21:20 pm »
Nice  :happy2:

Best get the hammer out  :evilgrin:
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Offline GrayMK5GTI

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Re: Pre-cat. . . . . REMOVED!
« Reply #20 on: January 22, 2012, 02:34:20 pm »
Quote from: GarethB on January 22, 2012, 02:21:20 pm
Nice  :happy2:

Best get the hammer out  :evilgrin:

DO IT! Will help it on the RR at JKM  :smiley:
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Offline GarethB

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Re: Pre-cat. . . . . REMOVED!
« Reply #21 on: January 22, 2012, 02:40:30 pm »
booked in at my mate's garage in a couple of weeks for a few bits - I shall have to see if we've got time to whip the downpipe off and remove the pre cat.

How long did it take to do? once the material is cracked/broken, does all it all kind of 'fall' out, or does it require extra work?
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Offline vRS_Pagey

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Re: Pre-cat. . . . . REMOVED!
« Reply #22 on: January 22, 2012, 02:46:51 pm »
Quote from: sideshowfred on January 21, 2012, 10:15:40 am
I'm really keen to do this when the weather warms up. One question though, are there any sensors i have to worry about that might not make it run smoothly??


If you DIY this, just be careful of the O2 sensors directly after both the pre-cat and main catalyst, if you damage them they're not cheap!  My advice, remove the one nearest the turbo before you start...... :drinking:
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Offline GrayMK5GTI

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Re: Pre-cat. . . . . REMOVED!
« Reply #23 on: January 22, 2012, 02:55:02 pm »
Quote from: GarethB on January 22, 2012, 02:40:30 pm
booked in at my mate's garage in a couple of weeks for a few bits - I shall have to see if we've got time to whip the downpipe off and remove the pre cat.

How long did it take to do? once the material is cracked/broken, does all it all kind of 'fall' out, or does it require extra work?

It took my local garage an hour to do, not sure on how hard it is, just got to make sure you turn it upside down after and shake all the bits out.

I'd advise ordering a new gasket and nuts from vw first, only cost about £8 total.
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Offline sideshowfred

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Re: Pre-cat. . . . . REMOVED!
« Reply #24 on: January 22, 2012, 04:23:30 pm »
Definitely going to get this done once the weather warms up a bit. I like cheap and easy mods  :grin:
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Offline Timvgti

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Re: Pre-cat. . . . . REMOVED!
« Reply #25 on: February 26, 2012, 03:48:56 pm »
Quote from: GrayMK5GTI on January 22, 2012, 01:17:44 pm
Can also confirm that this mod releases around 6bhp  :star: this was confirmed on the dyno

6BHP?? Wow NiCE!
Do you have a dynoplot from this?
Going to ask my garage/tuner to remove the pre-cat tommorow.
How much would this cost?
Think of doing this together with a exhaust tip swap.
The tips on my stock exhaust look rusted and ugly.
Maybe someting like the milltek gt80 tips look?...
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Offline GrayMK5GTI

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Re: Pre-cat. . . . . REMOVED!
« Reply #26 on: February 26, 2012, 05:47:43 pm »
Quote from: Timvgti on February 26, 2012, 03:48:56 pm
Quote from: GrayMK5GTI on January 22, 2012, 01:17:44 pm
Can also confirm that this mod releases around 6bhp  :star: this was confirmed on the dyno

6BHP?? Wow NiCE!
Do you have a dynoplot from this?
Going to ask my garage/tuner to remove the pre-cat tommorow.
How much would this cost?
Think of doing this together with a exhaust tip swap.
The tips on my stock exhaust look rusted and ugly.
Maybe someting like the milltek gt80 tips look?...

Yeah I got 204 on JKM's dyno before then got 210bhp on R-Tech's dyno. I know it's not ideal to compare one reading on one dyno against another reading on another but it's there or there a bouts.

It cost me about an hours labour at my local garage (could cost more if your turbo bolts are tight).

Have you tried Autosol from Halfrauds on the tips? Cleaned mine up nicely  :notworthy:
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Offline dannychapman2007

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Re: Pre-cat. . . . . REMOVED!
« Reply #27 on: February 26, 2012, 06:21:36 pm »
Will this be in the same location for my cupra with a ko4? Anyone done it with an eddy?


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Offline GrayMK5GTI

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Re: Pre-cat. . . . . REMOVED!
« Reply #28 on: February 27, 2012, 07:00:51 am »
Quote from: dannychapman2007 on February 26, 2012, 06:21:36 pm
Will this be in the same location for my cupra with a ko4? Anyone done it with an eddy?


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Yes mate the K04 downpipe is exactly the same as the Ko3 (standard GTI) one. Would probably give slightly better gains on an ED30 too!
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Offline smee

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Re: Pre-cat. . . . . REMOVED!
« Reply #29 on: February 27, 2012, 09:58:59 am »
i know the cat will obviously slow down the gases but isnt the main restriction on the standard down pipe the bend?? it goes from 2.75 inch to about an inch within that bend. thats where i would say the big restriction is. hence why the aftermarket jobs have no precat and full 3" bend.

nice work im sure it sounds nicer and louder but to me this is like drilling the engine cover from the 80's and 90's just sound and no gains.

would love to be proven wrong (yes i have seen the 6bhp figure quoted but i can get that by farting in my car ;) )
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