Squidbelly wants to know the best way to gut a manifold cat - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

regal · 03-06-2014, 05:42 PM

The last Toyota sports car (MR-S) was literally resurrected when someone discovered that reaming out the manifold cat prevented a lot of problems.

Ours seem to be holding up. But we know that a header works in tandem with a tune to eliminate the torque dip. But of this is restriction, the other is over heating the cat with timing adjustments. Really our stock manifold is quality piece except for the cat.

I was pondering giving this a shot but what tools would I need to gut the thing for off-road use?

Plxdjake89 · 03-06-2014, 05:43 PM

Google

FrsDuke · 03-06-2014, 06:01 PM

Some dude did this already on the forum and loved his results.

digital_assassin · 03-06-2014, 06:09 PM

@NickFRS

regal · 03-06-2014, 06:26 PM

Quote:

Originally Posted by Plxdjake89

Google

Google I only find straight pipe cats, ours is an oval hard loks hard to ream.

stugray · 03-06-2014, 06:29 PM

Quote:

Originally Posted by regal

Google I only find straight pipe cats, ours is an oval hard loks hard to ream.

I have never tried it, but if I did, my first thought is to sharpen a pipe and use it like a hole punch.

FrsDuke · 03-06-2014, 06:46 PM

Look through Nick's posts that he has started. Maybe pm him about how it was done.

regal · 03-06-2014, 07:01 PM

Quote:

Originally Posted by FrsDuke

Look through Nick's posts that he has started. Maybe pm him about how it was done.

Thanks, just plain Nick ?

FrsDuke · 03-06-2014, 07:10 PM

@NickFRS
http://www.ft86club.com/forums/showthread.php?t=55770

Captain Snooze · 03-07-2014, 01:02 AM

.

s2d4 · 03-07-2014, 01:10 AM

Quote:

Originally Posted by regal

the other is over heating the cat with timing adjustments. Really our stock manifold is quality piece except for the cat.

Care to document/explain how you came to these observations?

Shit Luck · 03-07-2014, 08:22 AM

I used to burn them out with a stick welder when I needed too. big heavy welding rod and turn up the juice...
fairly easy and fairly quick just be careful.

raven1231 · 03-07-2014, 09:16 AM

Quote:

Originally Posted by stugray

I have never tried it, but if I did, my first thought is to sharpen a pipe and use it like a hole punch.

This is what I did on prior cars

regal · 03-07-2014, 10:28 AM

Quote:

Originally Posted by s2d4

Care to document/explain how you came to these observations?

Shive has one of his posts (I think the one on stg2) where he shows how the cat limits timing in both vvt and ignition. Its pretty much common sense, unburnt fuel in the combustion chamber burns and heats the catalyst.

03-06-2014, 05:42 PM	#1
regal Senior Member Join Date: Jun 2012 Drives: Scion FR-S/Toyota Yaris Location: PA Posts: 1,438 Thanks: 21 Thanked 316 Times in 232 Posts Mentioned: 21 Post(s) Tagged: 0 Thread(s)	Squidbelly wants to know the best way to gut a manifold cat The last Toyota sports car (MR-S) was literally resurrected when someone discovered that reaming out the manifold cat prevented a lot of problems. Ours seem to be holding up. But we know that a header works in tandem with a tune to eliminate the torque dip. But of this is restriction, the other is over heating the cat with timing adjustments. Really our stock manifold is quality piece except for the cat. I was pondering giving this a shot but what tools would I need to gut the thing for off-road use? __________________ 2013 FRS Argento Silver 6MT Mods: Clear fender side lights Tactrix ZA1JB01C 2014 Calib

03-06-2014, 06:01 PM	#3
FrsDuke Fanboy Join Date: Dec 2013 Drives: 2013 ultramarine frs Location: Tx Posts: 612 Thanks: 242 Thanked 337 Times in 203 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Some dude did this already on the forum and loved his results. __________________ I'm done helping those who won't help themselves. TL;DR: -Duke

03-06-2014, 06:09 PM	#4
digital_assassin Senior Member Join Date: Feb 2011 Drives: 2013 FR-S Matte Orange Location: Portland, OR Posts: 2,016 Thanks: 489 Thanked 937 Times in 507 Posts Mentioned: 168 Post(s) Tagged: 0 Thread(s)	@NickFRS __________________ NORTHWEST86 DECAL - NORTHWEST86 GEAR MY BUILD

03-06-2014, 06:46 PM	#7
FrsDuke Fanboy Join Date: Dec 2013 Drives: 2013 ultramarine frs Location: Tx Posts: 612 Thanks: 242 Thanked 337 Times in 203 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Look through Nick's posts that he has started. Maybe pm him about how it was done. __________________ I'm done helping those who won't help themselves. TL;DR: -Duke

03-06-2014, 07:10 PM	#9
FrsDuke Fanboy Join Date: Dec 2013 Drives: 2013 ultramarine frs Location: Tx Posts: 612 Thanks: 242 Thanked 337 Times in 203 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	@NickFRS http://www.ft86club.com/forums/showthread.php?t=55770 __________________ I'm done helping those who won't help themselves. TL;DR: -Duke

03-06-2014, 05:43 PM	#2
Plxdjake89 Senior Member Join Date: Jun 2012 Drives: 2013 Scion FR-S-white out Location: 818 So Cal Posts: 612 Thanks: 354 Thanked 169 Times in 110 Posts Mentioned: 4 Post(s) Tagged: 1 Thread(s)	Google

03-07-2014, 01:02 AM	#10
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,720 Thanks: 3,992 Thanked 9,339 Times in 4,125 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	. Attached Images __________________ My car is completely stock except for all the mods.

03-07-2014, 08:22 AM	#12
Shit Luck Senior Member Join Date: Oct 2012 Drives: red frs Location: pa Posts: 1,031 Thanks: 244 Thanked 229 Times in 140 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	I used to burn them out with a stick welder when I needed too. big heavy welding rod and turn up the juice... fairly easy and fairly quick just be careful.

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