Innovate still reading ~.5 low compared to HPT
01-17-2006, 09:52 AM
#1
Innovate still reading ~.5 low compared to HPT I am still getting a roughly .5 difference in HPT and Innovate LM1. Innovate will show 13.0 where the HPT shows 13.5. I've tried the LM1 pid and PLX pin. The EIO has the both ground and hot wires connected. Do I need to do a custom pid to make it spot on?
Phil
Phil
01-17-2006, 10:13 AM
#2
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Read back the LM-1's cal curve and make sure
it agrees with the LM-1 PID values in HPTuners.
I am suspicious of ground loop errors between
the EIO and the LM-1. The LM-1 throws a lot
of heater current, and the two depend from
different branches of the vehicle ground. You
might want to look at the EIO ground, LM-1
ground and OBDII connector grounds, each
to the other, on a low DMM voltage scale. It
doesn't take more than a few tens of mV to
introduce that kind of AFR error, with the
broad span that the PID uses. Personally I
prefer to narrow the range (like 10-16:1 AFR
is 0-4V) a bit to minimize the effect of noise
and offset voltages. But I find my LM-1 can
"forget" sometimes and I have to keep on
top of the settings at both ends, when I
stray from the defaults.
it agrees with the LM-1 PID values in HPTuners.
I am suspicious of ground loop errors between
the EIO and the LM-1. The LM-1 throws a lot
of heater current, and the two depend from
different branches of the vehicle ground. You
might want to look at the EIO ground, LM-1
ground and OBDII connector grounds, each
to the other, on a low DMM voltage scale. It
doesn't take more than a few tens of mV to
introduce that kind of AFR error, with the
broad span that the PID uses. Personally I
prefer to narrow the range (like 10-16:1 AFR
is 0-4V) a bit to minimize the effect of noise
and offset voltages. But I find my LM-1 can
"forget" sometimes and I have to keep on
top of the settings at both ends, when I
stray from the defaults.
01-17-2006, 10:41 AM
#3
Originally Posted by jimmyblue
Read back the LM-1's cal curve and make sure
it agrees with the LM-1 PID values in HPTuners.
I am suspicious of ground loop errors between
the EIO and the LM-1. The LM-1 throws a lot
of heater current, and the two depend from
different branches of the vehicle ground. You
might want to look at the EIO ground, LM-1
ground and OBDII connector grounds, each
to the other, on a low DMM voltage scale. It
doesn't take more than a few tens of mV to
introduce that kind of AFR error, with the
broad span that the PID uses. Personally I
prefer to narrow the range (like 10-16:1 AFR
is 0-4V) a bit to minimize the effect of noise
and offset voltages. But I find my LM-1 can
"forget" sometimes and I have to keep on
top of the settings at both ends, when I
stray from the defaults.
it agrees with the LM-1 PID values in HPTuners.
I am suspicious of ground loop errors between
the EIO and the LM-1. The LM-1 throws a lot
of heater current, and the two depend from
different branches of the vehicle ground. You
might want to look at the EIO ground, LM-1
ground and OBDII connector grounds, each
to the other, on a low DMM voltage scale. It
doesn't take more than a few tens of mV to
introduce that kind of AFR error, with the
broad span that the PID uses. Personally I
prefer to narrow the range (like 10-16:1 AFR
is 0-4V) a bit to minimize the effect of noise
and offset voltages. But I find my LM-1 can
"forget" sometimes and I have to keep on
top of the settings at both ends, when I
stray from the defaults.
Phil
01-17-2006, 02:55 PM
#4
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Your closer than I am Phil. I am still at that difference of 3. I tried doing different input lines, etc, no luck. Probably something simple, but too tired from messing with to even want it work anymore. GL
Charlie
Jimmy... How cna you go for higher resolution on it? If 0=10 5=20, and you go to 0-4 then it should go 10-18, 2 full increments for each 1v? Not sure, but was reading on ppl trying to get resolution but without having the exact xV = xxAFR then it seems like you could be off.
Charlie
Jimmy... How cna you go for higher resolution on it? If 0=10 5=20, and you go to 0-4 then it should go 10-18, 2 full increments for each 1v? Not sure, but was reading on ppl trying to get resolution but without having the exact xV = xxAFR then it seems like you could be off.
01-17-2006, 06:52 PM
#5
What jimmy is saying is to reprogram the output to be 0=0 4=16. I personally have mine setup so that .5=10 and 4.5=16 and have calculated a new formula. If you calibrate the wideband correctly and come up with a new formula you should be good to go. Mine is within .1 at every AFR.
01-17-2006, 07:13 PM
#6
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Our LM1 reads .3-.5 more rich across the A/F range that we test with then our Horiba Lamda checker with its costly $900 wide band O2 sensor. When a vehicle is in closed loop the LM1 reads 14.3-.5 and the Horiba reads 14.6-.8. We've tried several different sensors after recalibrations with the same results on the LM1. We're going back to the Horiba with its expensive sensors, they seem more accurate and last much longer so the total cost in the long run probably isn't that much for a busy dyno shop. We will use the LM1 for a backup.
EJ
EJ
