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post #1 of 32 (permalink) Old 05-23-2012, 07:39 AM Thread Starter
irv
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Default o2 sensor ?'s

read a post lately about your engine running cooler by
unhooking the O2 sensors. does this just throw the ecm
in closed loop all the time.i assume your fuel air ratio is
now constant. at what ratio? 14.7? does this motor stay
around 13.2 or is it more? im looking for info as for what you would it do to the motor running around all the time with them unhooked
other than be rich and get less mileage. is there any real good
reason to do it to begin with on a completely stock '11 CR?
sounds like a stupid ? but thought i would ask. was 95 degrees
last sat and a lot of engine heat coming up at me. of course
im coming off of a liquid cooled vtx.--irv

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post #2 of 32 (permalink) Old 05-23-2012, 09:29 AM
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If I'm not mistaken disconnecting them throws it into open loop and it runs at a predetermined AFR which is lower than the O2 sensors are set at, therefore making it run a bit cooler. But at 95 degrees any air-cooled engine is gonna throw off a lot of heat - regardless of the AFR.

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post #3 of 32 (permalink) Old 05-23-2012, 09:41 AM
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Quote:
Originally Posted by irv View Post
read a post lately about your engine running cooler by
unhooking the O2 sensors. does this just throw the ecm
in closed loop all the time.i assume your fuel air ratio is
now constant. at what ratio? 14.7? does this motor stay
around 13.2 or is it more? im looking for info as for what you would it do to the motor running around all the time with them unhooked
other than be rich and get less mileage. is there any real good
reason to do it to begin with on a completely stock '11 CR?
sounds like a stupid ? but thought i would ask. was 95 degrees
last sat and a lot of engine heat coming up at me. of course
im coming off of a liquid cooled vtx.--irv
I'm not sure about the numbers and I have no experience with that. What I can tell you is my experience. I've been running no sensors for over a week now and have gone through about 3 tanks of fuel. At the time I unhooked mine, we had already reached 100 deg and my motor was getting quite warm. Within a mile, my butt was hot and legs could definitely feel the heat. Without the sensors, my butt doesn't get hot at all and the heat on my legs is greatly reduced and not felt for at least 5 miles.

Mileage...here's the really strange thing: it went up. Doesn't make sense I know, but the numbers don't lie. I went from going 140-145 on 3.5 gallons to over 150 on the same amount. NOT what I was expecting. I'm still trying to figure that one out.

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post #4 of 32 (permalink) Old 05-23-2012, 11:08 AM
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Leave your 02's hooked up.
You un hook them to create a richer running motor. So guys with up grade exhaust try to eliminate exhaust popping.
Yes your motor will run a tiny bit cooler in high elevation.
Motorcycle create heat and we sit on top of the oven so you should expect heat.

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post #5 of 32 (permalink) Old 05-23-2012, 01:17 PM
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Quote:
Originally Posted by visionjohnny View Post
Leave your 02's hooked up.
You un hook them to create a richer running motor. So guys with up grade exhaust try to eliminate exhaust popping.
Yes your motor will run a tiny bit cooler in high elevation.
Motorcycle create heat and we sit on top of the oven so you should expect heat.
Engine runs measurably cooler, makes better power, has improved drivability, and smoother throttle response. With o2 sensors unplugged. With the bike forced into open loop; average mixture is in the 13.7-14.0 range. Instead of the air cooled unfriendly 14.7-15.2 it runs in closed loop. Whats not to love

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post #6 of 32 (permalink) Old 05-23-2012, 01:32 PM
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Engine runs measurably cooler, makes better power, has improved drivability, and smoother throttle response. With o2 sensors unplugged. With the bike forced into open loop; average mixture is in the 13.7-14.0 range.
Just to clarify Kevin, the above is with sensors disco'd right?

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Originally Posted by kevinx View Post
Instead of the air cooled unfriendly 14.7-15.2 it runs in closed loop. Whats not to love
This is with sensors connected?

Just want to make sure.

Thank you for the info!

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post #7 of 32 (permalink) Old 05-23-2012, 02:04 PM
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I assume we will have to take out the CATS eventually as someone said it would clog them up?

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post #8 of 32 (permalink) Old 05-23-2012, 04:19 PM
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Quote:
Originally Posted by kingslyzissou View Post
Just to clarify Kevin, the above is with sensors disco'd right?



This is with sensors connected?

Just want to make sure.

Thank you for the info!
You are correct.

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post #9 of 32 (permalink) Old 05-23-2012, 04:23 PM
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I assume we will have to take out the CATS eventually as someone said it would clog them up?

Bikes still have the lean cut programing, and use the IAC as a air pump. So odds are good that you will never have to worry about cats being plugged. I have at least 2 customers with well over 100K; cats in o2's out. Leave em in it Visions, and X bikes. They actually MAKE power

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post #10 of 32 (permalink) Old 05-23-2012, 04:39 PM
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Quote:
Originally Posted by kevinx View Post
Leave em in it Visions, and X bikes. They actually MAKE power
Wow, now that's weird.

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