how to make oem cat into a high flow one
09-01-2007, 04:00 PM
#76
Metatron
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It will all come out clean, the ceramic is held in place by fibre around the edge, once it's broken up, the fibre falls out too.
Silverguy is right, don't start this unless you have a couple of days free......
As projects go, this rates up there as
".....**** - this IS impossible!"
or
"Jeebers, I wish I'd never STARTED this ****!"
You should also have the right size (metric) thread-tap on hand to clean up the sensor hole, because you WILL smash the threads.
S
Silverguy is right, don't start this unless you have a couple of days free......
As projects go, this rates up there as
".....**** - this IS impossible!"
or
"Jeebers, I wish I'd never STARTED this ****!"
You should also have the right size (metric) thread-tap on hand to clean up the sensor hole, because you WILL smash the threads.
S
09-01-2007, 04:07 PM
#77
I don't buy Kool-Aid
^Yup and thats why I was picking this apart. I want to know ex what the hell I'm doing befor I start. This way I know how long it will take me to do the job. This will have to wait till another time.
I thank you all for the great info and being patient with me. Now I just need some advil.
I thank you all for the great info and being patient with me. Now I just need some advil.
09-02-2007, 12:28 AM
#78
<3 Rotary
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If it makes it go faster, that means that the more catalyst you use (ie, the more you drive), the faster it goes. Sounds ridiculous to me.
Which brings me to another gain: audio. If you want better audio, get a MazdaSpeed exhaust.
And I am going to assume this is your first rotary vehicle? They run quite a bit louder than piston motors naturally so you can really tell Mazda used a very baffled muffler and cat from the factory to get the car as quiet as it is. With as much as the cat itself quiets down the car there is a good amount of restriction in that piece. You will see the biggest improvement in power by replacing the cat as compared to a cat back exhaust, header, intake, u/d pullies, etc.
09-02-2007, 12:55 AM
#79
No means yes
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As for power gains, it will not be anything dramatic, but if any exhaust mod will yield power this one certainly will. Not sure how this would stack up against a high-flow cat, though...
09-02-2007, 03:12 AM
#80
Well I'm done
All StealthTL stated above is TRUE! I was thinking what the **** have I started! Could've been cruzing around or watching a movie. Cars all put together but its to late and I'm too dirty & tired to start or drive my car. Will report back tomorrow.
Estimated time to complete 29hrs with long breaks in between. My breaks were needed because two times I almost just wanted to punch-out the the whole cat material out from the front end which would have made this job a 1-2hr job.
***If you have the extra cash laying around dont do this mod, just buy a supercat or something. But if your short on cash or saving for something else(Like me
) maybe this mod maybe for you.****
All StealthTL stated above is TRUE! I was thinking what the **** have I started! Could've been cruzing around or watching a movie. Cars all put together but its to late and I'm too dirty & tired to start or drive my car. Will report back tomorrow. Estimated time to complete 29hrs with long breaks in between. My breaks were needed because two times I almost just wanted to punch-out the the whole cat material out from the front end which would have made this job a 1-2hr job.
***If you have the extra cash laying around dont do this mod, just buy a supercat or something. But if your short on cash or saving for something else(Like me
) maybe this mod maybe for you.****
09-02-2007, 06:43 AM
#82
I don't buy Kool-Aid
Silver_Surfer, See thats why I was all questions on picking this apart for the ones like you and me that dont have 3-4, or more days time to complete this mod.
I was going to do it but after going over what has to be done; Time vs money, well money wins. I'll just buy a full exhaust system.
I was going to do it but after going over what has to be done; Time vs money, well money wins. I'll just buy a full exhaust system.
09-02-2007, 07:49 AM
#83
Momentum Keeps Me Going
Originally Posted by Silver_Surfer
Well My breaks were needed because two times I almost just wanted to punch-out the the whole cat material out from the front end which would have made this job a 1-2hr job.
09-03-2007, 03:22 AM
#84
Results: No cell Revs alittle faster, butt dyno feels alittle better. I would say from the way people describe the gains are about the same as a AP underdrive pulley but with alittle more deeper sound(I like!) I 'm not going to dyno it but I would guess its about the same or on par as a A/M supercat.
If anyone is going to do this mod buy a 4ft section of springsteel rod(I used my expensive nylon coated dewey rifle cleanning rod
) After stroking the rod back & fourth(Having sex with my cat with no climax
) for awhile I came up with an idea. I bent the front 1.5in section to about 75-80 degrees, pushed the rod into the back of the cat, hooked the other end to my drill and "Roto-Rotered it. Made quicker work.
Revs alittle faster, butt dyno feels alittle better. I would say from the way people describe the gains are about the same as a AP underdrive pulley but with alittle more deeper sound(I like!) I 'm not going to dyno it but I would guess its about the same or on par as a A/M supercat.If anyone is going to do this mod buy a 4ft section of springsteel rod(I used my expensive nylon coated dewey rifle cleanning rod
) After stroking the rod back & fourth(Having sex with my cat with no climax ) for awhile I came up with an idea. I bent the front 1.5in section to about 75-80 degrees, pushed the rod into the back of the cat, hooked the other end to my drill and "Roto-Rotered it. Made quicker work.
09-03-2007, 03:38 AM
#85
Silver_Surfer, See thats why I was all questions on picking this apart for the ones like you and me that dont have 3-4, or more days time to complete this mod.
I was going to do it but after going over what has to be done; Time vs money, well money wins. I'll just buy a full exhaust system.
I was going to do it but after going over what has to be done; Time vs money, well money wins. I'll just buy a full exhaust system.
I striped one of the front exhaust studs taking the cat off. Was a bitch to change. I did save a bunch(Geico) of cash but would I do it again? I just dont know.
09-03-2007, 01:14 PM
#86
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Well considering a supercat is about $400 new, it may be worth the trouble for someone who cannot devote unlimited funds to their car. For me it comes down to the fact that I have about $500 to spend on my next mod, and this way I can have a high-flow cat AND a nice cat-back.
PS- didn't get to it this weekend. Silver- did you take any pics?
PS- didn't get to it this weekend. Silver- did you take any pics?
09-03-2007, 03:01 PM
#87
Well considering a supercat is about $400 new, it may be worth the trouble for someone who cannot devote unlimited funds to their car. For me it comes down to the fact that I have about $500 to spend on my next mod, and this way I can have a high-flow cat AND a nice cat-back.
PS- didn't get to it this weekend. Silver- did you take any pics?
PS- didn't get to it this weekend. Silver- did you take any pics?
09-24-2007, 01:07 AM
#89
[QUOTE=Silver_Surfer;2038810]Results: No cell Revs alittle faster, butt dyno feels alittle better. I would say from the way people describe the gains are about the same as a AP underdrive pulley but with alittle more deeper sound(I like!) I 'm not going to dyno it but I would guess its about the same or on par as a A/M supercat.
***Update*** I just got finished installing my AP underdrive pulley. I had more gains with the cat mod than the AP underdrive pulley. Heck, felt little to no gains on the butt dyno. Wish someone could do a dyno test on both cats.
Revs alittle faster, butt dyno feels alittle better. I would say from the way people describe the gains are about the same as a AP underdrive pulley but with alittle more deeper sound(I like!) I 'm not going to dyno it but I would guess its about the same or on par as a A/M supercat.***Update*** I just got finished installing my AP underdrive pulley. I had more gains with the cat mod than the AP underdrive pulley. Heck, felt little to no gains on the butt dyno. Wish someone could do a dyno test on both cats.
10-01-2007, 11:44 AM
#90
alright to be honest i have no idea what you guys are talking about????first of all can someone tell me where i can get info on how an exhaust works....and how it differs from a straight pipe, and how it differs from a hi-flow,and what exactly a midpipe does and what exactly is a muffler then???im still in the process of understanding fast cars, i wasnt really interested in how a car goes fast untill my friend got an evo8, then i startd to ask myself how does this work, so i have very little knowledge on how the exhaust systems work....can some fellow 8 drivers give me some helpful info, hints, and advice....
Last edited by dozer; 10-01-2007 at 12:12 PM.
10-01-2007, 12:01 PM
#91
alright to be honest i have no idea what you guys are talking about????first of all can someone tell me where i can get info on how an exhaust works....and how it differs from a straight pipe, and how it differs from a hi-flow,and what exactly a midpipe does and what exactly is a muffler then???im still in the process of understanding fast cars, i was really interested in how a car goes fast untill my friend got an evo8, then i startd to ask myself how does this work, so i have very little knowledge on how the exhaust systems work....can some fellow 8 drivers give me some helpful info, hints, and advice....
And DONT DO THIS MOD!!!!!!!!!!!!!
10-02-2007, 01:59 PM
#93
10-08-2007, 01:44 AM
#95
No means yes
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If you do alot of tracking, a midpipe would be a good investment also, even if you only put it on for track days.
Not saying don't do it, just think of the options
10-10-2007, 12:12 AM
#97
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Mines goin bye-bye this weekend, hope I don't catch any flak at the shop here on post...
I kinda miss the muscle car...it was so much more straight-forward
Thanks for all the info guys
I kinda miss the muscle car...it was so much more straight-forward
Thanks for all the info guys
Last edited by needmorespeed; 10-10-2007 at 12:13 AM. Reason: I spell like a weeettarrrrd
11-01-2007, 02:21 PM
#98
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i plan on doin this tonight when i get off of work ... i hope to do it about four or five hours with the cut in two and weld back together method... any suggestions before i dive in ?
11-01-2007, 02:31 PM
#99
Metatron
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Using the chop-n-gouge method loses one of the advantages of this method - undetectability. The weld will be fairly obvious, unless you can get the heat shield off/replaced in good shape.
