No Device: HD/Delphi EFI Tuning Basics
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HD EFI Guru
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Yes most cars that use them are using the 4.9's. The 4.9 are the latest version of the LSU series sensor from Bosch. All the output specifications are unchanged from the LSU 4.2 but the durability is supposed to be better.
Road Warrior
Joined: Jun 2010
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From: Australia
your first post you state doesn't matter what product/tuner people are using
Now TTS data would be no good because it records faster than others, haha this a classic Andy taken over your account?
Now TTS data would be no good because it records faster than others, haha this a classic Andy taken over your account?
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HD EFI Guru
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So trying to compare what a TTS data set is going to look like to a PV data set is a complete waste of time, due to how much data the PV is missing!
Road Warrior
Joined: Jun 2015
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From: Edinburgh UK
Faster and more accurate (but still not in the realm of NB's) due to the cell being half the thickness of the 4.2
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HD EFI Guru
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The specifications for response time is slightly improved (~20 -25mS quicker) over the 4.2 but still slow next to a NB sensor. The accuracy specifications are the exact same from the 4.2 to the 4.9 Bosch specifications.
Seasoned HDF Member
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From: poway
Ok here is a question about the specs.. It seems to me that most of the response of a broadband sensor is determined by the time it takes the sampled gas to reach the location where it is sampled.. Narrow band sensors are faster because the transducer that provides the voltage out is right under the protective cover. Ok so.. Does the response of the Broadband sensor increase when the gasses are flowing 400 FPS? Does Bosch spec this in thier testing?
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Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
Ok here is a question about the specs.. It seems to me that most of the response of a broadband sensor is determined by the time it takes the sampled gas to reach the location where it is sampled.. Narrow band sensors are faster because the transducer that provides the voltage out is right under the protective cover. Ok so.. Does the response of the Broadband sensor increase when the gasses are flowing 400 FPS? Does Bosch spec this in thier testing?
The sampling delay - combustion gasses reaching the sensor (about 2.5ms at 400fps and sensor about 1ft from the head)
The sensor response - if the amount of O2 in the pipe changes, how quickly does the O2 sensor notice
Blip the throttle, the broadband might harley notice because the change in O2 has shot past the sensor before it responded to any change ...kind of thing
The Bosch specs I found for the sensors don't even mention response time or pressure??
Last edited by Gordon61; Jul 25, 2016 at 06:18 AM.
Seasoned HDF Member
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From: poway
Not quite sure that is how it would work, there are two things there
The sampling delay - combustion gasses reaching the sensor (about 2.5ms at 400fps and sensor about 1ft from the head)
The sensor response - if the amount of O2 in the pipe changes, how quickly does the O2 sensor notice
Blip the throttle, the broadband might harley notice because the change in O2 has shot past the sensor before it responded to any change ...kind of thing
The Bosch specs I found for the sensors don't even mention response time or pressure??
The sampling delay - combustion gasses reaching the sensor (about 2.5ms at 400fps and sensor about 1ft from the head)
The sensor response - if the amount of O2 in the pipe changes, how quickly does the O2 sensor notice
Blip the throttle, the broadband might harley notice because the change in O2 has shot past the sensor before it responded to any change ...kind of thing
The Bosch specs I found for the sensors don't even mention response time or pressure??
So your first statement does not apply but the second is the question I'm asking. Does exhaust gas velocity effect 02 sensor response?
Don't understand the "Blip the throttle" statement..
Bosch specs suck but IIRC broadband so have a change on V out based on pressure in the exhaust system.