Another decat......
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Cruiser
Joined: Jul 2006
Posts: 237
Likes: 29
From: NorCal
Another decat......
I asked about power gains or loss in a different post and pretty much everyone said nothing to gain. Does anyone have proof from a wideband of back to back cat and decat on the air fuel ratio? I bought a take off head pipe and still want to get rid of the cat. I've seen other posts about it. Some said gets richer, some get leaner but no proof from a wideband or dyno. If the information is out there I haven't found it.
Road Warrior
Joined: Feb 2007
Posts: 1,730
Likes: 199
From: Vancouver BC
I asked about power gains or loss in a different post and pretty much everyone said nothing to gain. Does anyone have proof from a wideband of back to back cat and decat on the air fuel ratio? I bought a take off head pipe and still want to get rid of the cat. I've seen other posts about it. Some said gets richer, some get leaner but no proof from a wideband or dyno. If the information is out there I haven't found it.
Thread Starter
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Cruiser
Joined: Jul 2006
Posts: 237
Likes: 29
From: NorCal
I couldn't find one for just removing the cat. I'm not worried about a power gain. Just want to help it run cooler. I want to make sure the air fuel ratio doesn't go lean.
Road Warrior
Joined: Sep 2016
Posts: 1,395
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From: Okmulgee
There to lean from the factory.... stock.
Ultimate HDF Member
Joined: Oct 2016
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From: On my bike!
It definitely runs cooler and as far as the AFR going lean, that's where a good tuner comes in.
Road Warrior
Joined: Feb 2007
Posts: 1,730
Likes: 199
From: Vancouver BC
Catless headpipe on its own prol won't make much difference to the heat. You have to add a little fuel. HD tuner is still EPA compliant so go with an aftermarket tuner and risk your drivetrain warranty while running better and cooler or stick with EPA....
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Road Warrior
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Stellar HDF Member
Joined: Sep 2009
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A good tune will cool it down better than removing the cat and increasing airflow without appropriate recalibration of the fueling.
It should/would run fine (albeit lean as delivered) at cruise due to the O2 sensors. What the system can't do is compensate in the high load/rpm areas. Those areas do not use the O2 sensors to trim fuel so logically it must run leaner/hotter.
Bob
It should/would run fine (albeit lean as delivered) at cruise due to the O2 sensors. What the system can't do is compensate in the high load/rpm areas. Those areas do not use the O2 sensors to trim fuel so logically it must run leaner/hotter.
Bob
Road Master
Joined: Apr 2016
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From: Davenport, IA
^^^Yep!^^^