theturboeffect
Novice Class
Posts: 56
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posted June 25, 2004 06:31 PM
exhaust mod dyno?
Has anybody dynoed their bike stock and then with the catalytic converter removed and holes poked through the center. Just curious before i do it to mine. don't want to do it if it hurt the powerband.
  
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bovinespongiformencephalo
Pro
variant Kreutzfeldt-Jakob
Posts: 1060
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posted June 25, 2004 07:47 PM
Just do it. You won't regret it. The best way to get the cat out is to find some steel tubing with about a 2" OD to just fit inside the inlet. Then pound it through the cat. Turns a seriously onerous chore into a 10 min. thing.
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TAFB
Expert Class
Posts: 138
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posted June 25, 2004 08:21 PM
do a search...i posted a dyno of mine stock v. with the cat removed...i did not poke the holes through the center.
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TAFB
Expert Class
Posts: 138
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posted June 25, 2004 08:23 PM
doh...the results were 1hp gain on top and a 3hp gain in the 7-8,000 rpm range.
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theturboeffect
Novice Class
Posts: 56
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posted June 26, 2004 12:09 PM
thanks for the info TAFB
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theturboeffect
Novice Class
Posts: 56
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posted June 26, 2004 02:37 PM
well just got done doing the exhaust mod. Used a drill router to get the converter out then I used a 14 in drill bit to drill out the plate. I ran it and it sounds a little different but have not had a chance to ride it yet. Let you guys know how it feels when I get back.
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theturboeffect
Novice Class
Posts: 56
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posted June 26, 2004 03:48 PM
Just got back from riding it and I have to say I am not that happy with the sound. I made two, one inch holes in the plate and I am thinking about drilling more holes to let more air get through. Anyone else had this problem?
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bovinespongiformencephalo
Pro
variant Kreutzfeldt-Jakob
Posts: 1060
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posted June 26, 2004 06:56 PM
I started with two holes and went to three because it didn't drone and I was feeling lucky. Now I like it more.
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