Hooking wideband up to HPT Pro
05-14-2009, 05:52 PM
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Hooking wideband up to HPT Pro I have HPT Pro and a AEM UEGO wideband. While i am scanning everything my gauge reads about .3 afr lower than the scanner shows(12.6 compared to 12.9). I am not sure what the problem is. The white wire comming from the gauge is like 20-22 gauge wire. I extended this with some 16 gauge wire. I am not sure that will cause a problem? What will cause the scanner and gauge to read different? Thanks
Last edited by highflyin; 05-14-2009 at 06:25 PM.
05-17-2009, 11:25 AM
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Ground offsets in the wideband-OBDII connector ground
points are a prime candidate. Try taking a voltmeter and
put it between EIO ground and WB ground, with no other
connection between the two but everything lit up and
hooked up normally, otherwise.
Half a volt is probably 1 AFR point. How many mV do you
read?
I posted the other day about one way to fix this issue,
"Instrumentation Amplifiers". Though there are some other
ways to corrupt the data; be sure you verify that the WB
output transfer characteristic is the same as what the HP
Tuners PID expects it to be.
points are a prime candidate. Try taking a voltmeter and
put it between EIO ground and WB ground, with no other
connection between the two but everything lit up and
hooked up normally, otherwise.
Half a volt is probably 1 AFR point. How many mV do you
read?
I posted the other day about one way to fix this issue,
"Instrumentation Amplifiers". Though there are some other
ways to corrupt the data; be sure you verify that the WB
output transfer characteristic is the same as what the HP
Tuners PID expects it to be.
05-17-2009, 07:38 PM
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I like a "star" ground scheme, but for example my LM-1 has
about 6' of power lead, through 2 connectors, from wherever
that common point might be. The key is for the logger "front
end electronics" ground and the wideband output reference
ground to be electrically the same. But in my case the LM-1
throws heater return current down the same wire & conns
as signal ground uses.
So while it's better than what you'd be dealing with as-stock,
you can only eliminate some fraction of the offsets by "ground
hygeine". How much, I guess depends on your wideband model
and how many short-cuts were taken in its design.
about 6' of power lead, through 2 connectors, from wherever
that common point might be. The key is for the logger "front
end electronics" ground and the wideband output reference
ground to be electrically the same. But in my case the LM-1
throws heater return current down the same wire & conns
as signal ground uses.
So while it's better than what you'd be dealing with as-stock,
you can only eliminate some fraction of the offsets by "ground
hygeine". How much, I guess depends on your wideband model
and how many short-cuts were taken in its design.
