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Iron Butt
Posts: 691
Manchester, CT | Fellow Riders
Has anyone removed the CATS from their exhaust? How does it sound at idle, at speed and during acceleration? |
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Tourer
Posts: 366
Albuquerque, NM | chk this thread....not recommended!
http://www.vision-riders.com/bb/forums/thread-view.asp?tid=12995&po...
Edited by nailer 2013-07-29 11:52 AM
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Visionary
Posts: 2300
Georgia, west of Atlanta | I was advised by Lloyd "Do not remove".... It kills bottom end on lightly upgraded engines. My VV has 115.5 HP and 117.2 Tq with just VM-1 cam, PC-V, top filter and CFR slip ons.....I consider this a lightly modified engine. The VM-1 cam has .412 lift I'm told and the stock cams are .393 lift. I do not know the duration figures or opening-closing specs for the VM-1. But it is NOT a long duration bottom end killer. There are bigger/ longer duration cams for more "developed" engines. |
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Visionary
Posts: 1340
Gainesville Fl Home of the Gators | In the middle of some experimentation with lolipops in the cat location right now. Looks promising |
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Iron Butt
Posts: 1066
Peru, IN | Definitely want to hear the results of that, Kevin! I'd rip the cats out if there was something easy to put in their place to keep the backpressure. |
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Visionary
Posts: 2300
Georgia, west of Atlanta | Monkeyman - 2013-07-29 6:31 PM
Definitely want to hear the results of that, Kevin! I'd rip the cats out if there was something easy to put in their place to keep the backpressure.
Me too....... |
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Visionary
Posts: 1365
Central Maryland | Is it possible to "crush" the honeycombed catalytic inserts with the exhaust clamp? |
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Iron Butt
Posts: 691
Manchester, CT | Thanks for the great feedback!
Kevin, excuse my ignorance but can you please enlighten me on "lollipops" |
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Iron Butt
Posts: 1066
Peru, IN | I'm not Kevin but a lollipop is basically a washer welded to a bolt stuck in the middle of the exhaust. As you rotate the washer, you tune the exhaust. |
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Cruiser
Posts: 238
SF Bay Area | Like these... yes I am old enough to have had these on one of my bikes back in the 60's
(suff_or_nots.jpg)
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 suff_or_nots.jpg (60KB - 1 downloads)
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Visionary
Posts: 4278
| willtill - 2013-07-29 7:18 PM Is it possible to "crush" the honeycombed catalytic inserts with the exhaust clamp? NO NO NO |
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Visionary
Posts: 4278
| Bub exhaust had pipes where they had a 5/16" bolt screwed in the middle of the pipe. By changing how much was in the pipe it would change the sound.
Never went over but it did work for sound and some power |
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Visionary
Posts: 1340
Gainesville Fl Home of the Gators | Been away getting my head together for a few days. The lolipops are not as big as the tuner cut outs shown in that old add, but vaugley similar. Have not done any dyno testing on it as of yet, but oil temp is down some 20 degrees at extended south Florida highway cruise[above 80 MPH] lower heat build up of rear pipe around town. Will be coming up here in a week or so to put it back on the dyno, and we can see if his torque came back. According to him it is night and day
Edited by kevinx 2013-08-10 11:39 AM
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Iron Butt
Posts: 1066
Peru, IN | Keep us informed, Kevin! If a simple lollipop (and eliminating the cats) will decrease the heat and keep the torque/hp, I'm in. |
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Cruiser
Posts: 114
Southeast, AZ United States | Monkeyman - 2013-08-10 9:32 AM
Keep us informed, Kevin! If a simple lollipop (and eliminating the cats) will decrease the heat and keep the torque/hp, I'm in.
This!!! |
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Cruiser
Posts: 111
| Night and day - now that deserves a dyno run. When I did the Thrush mod, I took a long hard look at them, two inches of thin honeycomb can't produce much restriction. The additional heat is understandable as they burn the CO into CO2. Night and day, can't get that out of my head.
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Removing CATS from exhaust
