voltage offset question
voltage offset question I figured out my offset of .2 v.....
My equation reads : volts/.6266 + 10.32 (.6266 because lc-1 will only let me set a max afr of 17.98?)
I realize you have to create a custom pid, I just don't know exactly how/where to place this equation to get the desired results.
Can someone show me the way??
My equation reads : volts/.6266 + 10.32 (.6266 because lc-1 will only let me set a max afr of 17.98?)
I realize you have to create a custom pid, I just don't know exactly how/where to place this equation to get the desired results.
Can someone show me the way??
0-5 volts will give you more resolution why not program it for that
0V=10
5V=20
AFR=v*2+10 is the formula and should allready be predefined in the software for one if the other Widebands
or do 1V=10AFR
and 2V=20AFR
this is what i use for my lm-1 settings and they should work the same for the lc-1
0V=10
5V=20
AFR=v*2+10 is the formula and should allready be predefined in the software for one if the other Widebands
or do 1V=10AFR
and 2V=20AFR
this is what i use for my lm-1 settings and they should work the same for the lc-1
it is programmed for 0-5v....
When I go to programthe AFR range of 10-18 when I return to the programming screen it read 10-17.98.I don't know why.
I doesn't really matter why....as long as I use the correct #'s in my equation it shouldn't matter.
I need to know how to set up a custom pid using my offset equation so that HPT reads the same AFR as logworks.
I have been ideling in the driveway for quite some time and I think my nieghbours are getting pissed..
When I go to programthe AFR range of 10-18 when I return to the programming screen it read 10-17.98.I don't know why.
I doesn't really matter why....as long as I use the correct #'s in my equation it shouldn't matter.
I need to know how to set up a custom pid using my offset equation so that HPT reads the same AFR as logworks.
I have been ideling in the driveway for quite some time and I think my nieghbours are getting pissed..
Actually, it's not limited to 17.98. It just doesn't keep some whole numbers for some reason. From the factory, the LC1 is set for 0v=7.35 and 5v=22.35. That's why the formula for the LC1 is (Volts*3)+7.35. But if you try to program that in, the 22.35 becomes slightly different (off by sever hundreths) like you seen earlier. If your voltage is offset by .2 (meaning you log .2v more than commanded), then your LC1 formula should be ((Volts-.2)*3)+7.35. Simple enough, eh?
From what I've seen the offset is not necessarily
consistent and the gain error can be nonlinear as
well. I don't think correcting it this way is reliable.
Try acquiring a series of straight voltage measurements
with the LC-1 set to output flat (10:1 = 1.000, 18:1 =
1.000; 0.0, 2.0, 3.0, 4.0, 5.0 in turn). Get the true
voltage output measured without the scanner hooked
to the LC-1, get the true voltage with them hooked up
(talking DMM here, an tie-breaker). And get the scanner
logged value. Also handy would be a reading of ground-
ground voltage (DMM) with the two not connected.
Now do it again a few days later in different weather
(changing the heater power profile).
One guy did this (one session only), I saw the data
and it was just plain bent. Not a straight line to be
found. So making a straight line fit for it, is not going
to make it correct. If your situation is anything like.
The gain error is really perplexing and I would like to
know which end it's on, the output of the LC-1 or the
input of the logger pod. Guess if I weren't so lazy I'd
try that out myself. But I have a different wideband.
consistent and the gain error can be nonlinear as
well. I don't think correcting it this way is reliable.
Try acquiring a series of straight voltage measurements
with the LC-1 set to output flat (10:1 = 1.000, 18:1 =
1.000; 0.0, 2.0, 3.0, 4.0, 5.0 in turn). Get the true
voltage output measured without the scanner hooked
to the LC-1, get the true voltage with them hooked up
(talking DMM here, an tie-breaker). And get the scanner
logged value. Also handy would be a reading of ground-
ground voltage (DMM) with the two not connected.
Now do it again a few days later in different weather
(changing the heater power profile).
One guy did this (one session only), I saw the data
and it was just plain bent. Not a straight line to be
found. So making a straight line fit for it, is not going
to make it correct. If your situation is anything like.
The gain error is really perplexing and I would like to
know which end it's on, the output of the LC-1 or the
input of the logger pod. Guess if I weren't so lazy I'd
try that out myself. But I have a different wideband.
Originally Posted by SSpdDmon
Actually, it's not limited to 17.98. It just doesn't keep some whole numbers for some reason. From the factory, the LC1 is set for 0v=7.35 and 5v=22.35. That's why the formula for the LC1 is (Volts*3)+7.35. But if you try to program that in, the 22.35 becomes slightly different (off by sever hundreths) like you seen earlier. If your voltage is offset by .2 (meaning you log .2v more than commanded), then your LC1 formula should be ((Volts-.2)*3)+7.35. Simple enough, eh?
I was reading about the offsets over on HP's forum and the formula used there was :Wideband reports 3.0v
EIO reports 2.7v
so you have an offset of .3 volts (WB-EIO)(3.0-2.7)
You will need to make a Custom PID for the EIO to be accurate
volts / (voltage range/Device range) + (Minimum value of device range)
Volts/ (5/8) + 10
5/8= .625
Volts/ .625 + 10+offset in value of device\
Edit: fixed this part of the equation below
.3/.625 =0.48
so in our example
Volts / .625 + 10.48
Thats what I am trying to do however I don't know where to use this formula.
Do I still log raw voltage ( sens .50) and use this formula to spit out an AFR reading??
My car will be off the road in a couple of weeks and I have yet to do any tuning.
jimmyblue...I understand what you are saying as my offset isn't totally linear either.
Should I move the grounds around to try and get rid of the offset?
Should I ditch the LC-1 and get another WB that doesn't have this problem??
Should I get a yugo???
Should I move the grounds around to try and get rid of the offset?
Should I ditch the LC-1 and get another WB that doesn't have this problem??
Should I get a yugo???
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Originally Posted by molson
Thanks for the explanation.....I actually command 5 v and read 4.8 in HPT The formula for the LC-1 that you listed where do you find it to modify it? I remember selecting it but can't find where.
I was reading about the offsets over on HP's forum and the formula used there was :Wideband reports 3.0v
EIO reports 2.7v
so you have an offset of .3 volts (WB-EIO)(3.0-2.7)
You will need to make a Custom PID for the EIO to be accurate
volts / (voltage range/Device range) + (Minimum value of device range)
Volts/ (5/8) + 10
5/8= .625
Volts/ .625 + 10+offset in value of device\
Edit: fixed this part of the equation below
.3/.625 =0.48
so in our example
Volts / .625 + 10.48
Thats what I am trying to do however I don't know where to use this formula.
Do I still log raw voltage ( sens .50) and use this formula to spit out an AFR reading??
My car will be off the road in a couple of weeks and I have yet to do any tuning.
I was reading about the offsets over on HP's forum and the formula used there was :Wideband reports 3.0v
EIO reports 2.7v
so you have an offset of .3 volts (WB-EIO)(3.0-2.7)
You will need to make a Custom PID for the EIO to be accurate
volts / (voltage range/Device range) + (Minimum value of device range)
Volts/ (5/8) + 10
5/8= .625
Volts/ .625 + 10+offset in value of device\
Edit: fixed this part of the equation below
.3/.625 =0.48
so in our example
Volts / .625 + 10.48
Thats what I am trying to do however I don't know where to use this formula.
Do I still log raw voltage ( sens .50) and use this formula to spit out an AFR reading??
My car will be off the road in a couple of weeks and I have yet to do any tuning.
To answer your question using the .3V offset you noticed...
You said you saw 2.7 on the EIO and 3.0 was commanded on the LC1. Assuming this was true for the range you'll be recording in, then your new equation would be ((Volts+.3)*3)+7.35. This will correct the .3V offset and keep the stock LC1 range of 0V=7.35AFR and 5V=22.35AFR.
Once you figure out the right equation, you need to create a custom PID. Try searching here or over at the HPT forums on how to create custom PIDs. I use EFI Live, so my process is different.
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