Difference in wideband and HPtuners...
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From: Port Tobacco, MD
Difference in wideband and HPtuners... I started logging the wideband for VE tuning and noticed that the HPtuners is showing A/F .2 more than actual. If innovate says 13.0 HPT says 12.8. What causes this?
Phil
Phil
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From: Port Tobacco, MD
Originally Posted by HumpinSS
Are you using the ground wire on the pigtail
You have to specify the LM1 output transfer curve
and the HPTuners input transfer curve. Are they
identical? Do they agree at (say) 15.0:1 any
better, or are they offset by the same amount
across the band (that would indicate a ground
offset)?
To maximize the accuracy you might want to set
the LM1 output / HPTuners input to "throw away"
range you're not using - for example, why make
0-5V represent 10.0-20.0:1 AFR if you are well
enough tuned and don't care about anything
outside 11:1 - 16:1? Then the same voltage
range represents with 2X greater accuracy the
AFR.
But do check the LM1 and HPTuners cal curves,
I know the LM1 likes to round down my endpoint
AFR represented and maybe there's a bit slipped
here & there.
and the HPTuners input transfer curve. Are they
identical? Do they agree at (say) 15.0:1 any
better, or are they offset by the same amount
across the band (that would indicate a ground
offset)?
To maximize the accuracy you might want to set
the LM1 output / HPTuners input to "throw away"
range you're not using - for example, why make
0-5V represent 10.0-20.0:1 AFR if you are well
enough tuned and don't care about anything
outside 11:1 - 16:1? Then the same voltage
range represents with 2X greater accuracy the
AFR.
But do check the LM1 and HPTuners cal curves,
I know the LM1 likes to round down my endpoint
AFR represented and maybe there's a bit slipped
here & there.
Thread Starter
7 Second Club
iTrader: (11)
Joined: Jul 2002
Posts: 8,758
Likes: 9
From: Port Tobacco, MD
Originally Posted by jimmyblue
You have to specify the LM1 output transfer curve
and the HPTuners input transfer curve. Are they
identical? Do they agree at (say) 15.0:1 any
better, or are they offset by the same amount
across the band (that would indicate a ground
offset)?
To maximize the accuracy you might want to set
the LM1 output / HPTuners input to "throw away"
range you're not using - for example, why make
0-5V represent 10.0-20.0:1 AFR if you are well
enough tuned and don't care about anything
outside 11:1 - 16:1? Then the same voltage
range represents with 2X greater accuracy the
AFR.
But do check the LM1 and HPTuners cal curves,
I know the LM1 likes to round down my endpoint
AFR represented and maybe there's a bit slipped
here & there.
and the HPTuners input transfer curve. Are they
identical? Do they agree at (say) 15.0:1 any
better, or are they offset by the same amount
across the band (that would indicate a ground
offset)?
To maximize the accuracy you might want to set
the LM1 output / HPTuners input to "throw away"
range you're not using - for example, why make
0-5V represent 10.0-20.0:1 AFR if you are well
enough tuned and don't care about anything
outside 11:1 - 16:1? Then the same voltage
range represents with 2X greater accuracy the
AFR.
But do check the LM1 and HPTuners cal curves,
I know the LM1 likes to round down my endpoint
AFR represented and maybe there's a bit slipped
here & there.
How fast should the numbers change for the wideband in the HPtuners table display? My numbers cycle soo fast you can't accurately read them.
Phil
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