PCV bypasses O2 sensor ?
Outstanding HDF Member
Joined: Jun 2008
Posts: 2,132
Likes: 25
From: NorCal
I was told that the stock ECM senses barometric pressure when you turn the bike on before you start and adjusts the map accordingly. I have no idea whether the PCV overrides this, but the bike seemed to run fine.
I would recommend getting a TTS for many reasons, but if you already have the PCV then don't worry about it.
Road Warrior
Joined: Jun 2008
Posts: 1,437
Likes: 80
From: currently an Okie
Wow
why not just buy it, and have Jamie create a map for sea level and a map for higher altitude and switch them.
The newer PC have a function which allows you to switch between two maps stored in memory with an external switch . .
Most people use it for "street" and "strip", but it could conceivably be used for any combination of maps.
BD
The newer PC have a function which allows you to switch between two maps stored in memory with an external switch . .
Most people use it for "street" and "strip", but it could conceivably be used for any combination of maps.
BD
A PC-V equipped bike will handle changes in altitude very well. The key component the system uses is the Map sensor which measures absolute pressure and allows the ECM to make the necessary adjustments based on pressure, which is constantly changing.
__________________
Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Jamie Long / Fuel Moto USA
The USA's Leader V-Twin EFI & Performance www.fuelmotousa.com
Contact 920-423-3309
Email jamie@fuelmotousa.com
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,182
Likes: 0
From: Phoenix
Have a PCV headed my way from Fuel Moto as part of their stage 1 power pack and have recently heard that the PCV does not use the O2 sensors. Is that correct?
Then my next question is, if it doesn't use the O2 sensors, how well do the bikes handle changes in altitude if the ECM isn't adjusting the air/fuel ratio for the different altitudes. The reason why I'm asking this is I often can go from sea level to 7000 foot in less than an hour. And one thing I like about the stock fuel injection is the bike runs flawlessly at any altitude. Am I going to lose this with the PCV?
Then my next question is, if it doesn't use the O2 sensors, how well do the bikes handle changes in altitude if the ECM isn't adjusting the air/fuel ratio for the different altitudes. The reason why I'm asking this is I often can go from sea level to 7000 foot in less than an hour. And one thing I like about the stock fuel injection is the bike runs flawlessly at any altitude. Am I going to lose this with the PCV?
Elite HDF Member
Joined: Nov 2007
Posts: 4,646
Likes: 40
From: Midtown Tulsa
Mine worked great from Tulsa to Tombstone; going through Alamogordo and Ruidoso (around 6000 ft). PCV, Ventilator air cleaner, and Fuel Moto Tuned slip ons.
Got 42 mpg approx the entire trip... '09 Ultra
Got 42 mpg approx the entire trip... '09 Ultra
Outstanding HDF Member
Joined: Jul 2010
Posts: 2,727
Likes: 6
It depends on the map you get. If you get a closed loop map then the sensors wont be needed. I believe PCV has an auto tune function in which case you will need the sensors. You need to call fuel moto and ask him these questions. Tell him your riding style and let him write a tune for you
What do you mean by "closed loop map"? How do you know which one you have? My bike has problems when it gets hot, could this be the reason?
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Ultimate HDF Member
Joined: Feb 2006
Posts: 5,190
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From: Eastern Washington
Actually rereading that post I realize I am wrong. You DO need sensors in a closed loop map. Depending on which tuner and software you have you can see what map you have. Unless you have a plugged 02 bungs and sensors removed, chances are you are running a closed loop system. Closed loop means the efi is adjustable depending on what the 02 sensors are reading. When a cold bike is started it is in open loop, then when it warms it switches to closed loop.
Last edited by PistonPuller; Nov 20, 2010 at 05:41 PM.
Seasoned HDF Member
Joined: Oct 2006
Posts: 5,977
Likes: 85
From: Nevada
Sensors should be eliminated with a PC111.