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Old 05-18-2010, 07:19 PM   #1
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Default car is at dyno shop. Please help with a quick response!

The shop is having an issue saying that the wideband seems to be showing the correct afr on the wideband lc1 guage but adaptronic is not reading the same numbers as the guage is.. Is there some way to calibrate adaptronic? They can do a manual tune to it. But they said they would prefer the self tuning features.
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Old 05-18-2010, 07:49 PM   #2
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In the Megasquirt, there's actually a software box to tell the unit exactly what Wideband you're using. Check through the Adaptronic... perhaps there's the same thing.

FROM THE ADAPTRONIC MANUAL:

2.1.3. Oxygen sensor input and Air-Fuel Ratio
2.1.3.0. Introduction
There are two basic sources of air-fuel ratio measurement. One is an analogue input
on the EGO input while the other is via serial communications from the auxiliary
ECU serial port.
The analogue input looks like a 10 M
resistor in parallel with a 100nF capacitor to
0V. It can accept an input in the 0V - 3V range.
The following sections show the calculations performed to obtain the AFR from the
oxygen sensor voltage, depending on the mode selected.
Note that if a serial-connected wideband oxygen sensor is selected and connected, the
AFR from it overrides the AFR calculated from the analogue input. This allows the
installer to configure the ECU with a standard oxygen sensor, tune it using his/her
wideband probe of choice and then disconnect the wideband probe without changing
any wiring.

2.1.3.1. Oxygen sensor input: None
The AFR is set to "invalid".
2.1.3.2. Oxygen sensor input: OEM, Narrow Band
The AFR is set to "invalid" by default. When the sensor consistently provides a
voltage greater than 0.22V, the ECU considers that the sensor has warmed up
sufficiently and is producing valid output voltages. From then on, the input is
interpolated according to the following table:
Adaptronic Installer's Guide 20 of 67 http://www.adaptronic.com.au
Voltage AFR Reading
Lower value
0.0 15.5

Upper value
1.0 14.0

Table 4: Calibration table used by the ECU in OEM Narrow Band mode
In practice, the actual AFR will vary by a much narrower range than this over this
voltage range, however for operating an engine at stoichiometry, the control algorithm
works effectively.
2.1.3.3. Oxygen sensor input: UEGO 0-3V
This mode assumes that following calibration:
Voltage AFR Reading
Lower value
0.0 10.0

Upper value
3.0 20.0

Table 5: Calibration table used by the ECU in UEGO 0-3V mode
This mode can be used in conjunction with an M&W UEGO, provided a separate
voltage divider is wired in (see the section on wiring the oxygen sensor). Many
aftermarket wideband sensors have a programmable output which can be set up in this
way. However with this mode there is no detection of a sensor not being up to
operating temperature.
2.1.3.4. Oxygen sensor input: Bosch Wideband 0-1V
This mode was intended for the 0258 104 002 Bosch sensor. The following
calibration table is used:
Voltage AFR Reading
Lower value
0.36 17.0
0.84 13.0

Upper value
0.88 11.0

Table 6: Calibration table used by the ECU in Bosch 0-1V mode
This mode also has no detection of the state of the sensor, so may read lean for the
first minute or so as it heats up. Care should be taken when installing this sensor;
there have been reports that if it is mounted directly in the gas stream, the voltage
output will reduce as the exhaust velocity increases, leading to a leaner reading/
2.1.3.5. Oxygen sensor input: Zeitronix (0.4 - 3V)
This mode was intended for the Zeitronix wideband lambda sensor. The following
calibration table is used:
Adaptronic Installer's Guide 21 of 67 http://www.adaptronic.com.au
Voltage AFR Reading
Lower value
0.4 10.0
1.1 11.0
2.5 14.7

Upper value
3.0 19.0

Table 7: Calibration table used by the ECU in Zeitronix mode
Below 0.4V, it is assumed that the sensor is disconnected or an invalid value, and so
the AFR reading is invalid
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Old 05-18-2010, 08:04 PM   #3
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Is the lc-1 hooked up via the second serial connection or analog? Which LC-1 output did you connect to the gauge and how is it calibrated? Did you calibrate the LC-1 when you put it in?

The info Sam posted is good for analog.

If you're using the serial connection then make sure that on the 'Special Functions' tab that the LC-1 is selected for the 'Second Serial Port'. If that is correct then I would trust the value that the Adaptronic is seeing over the gauge value, unless it is really strange.
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Old 05-18-2010, 08:10 PM   #4
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Quote:
Originally Posted by ls1motorsports View Post
The shop is having an issue saying that the wideband seems to be showing the correct afr on the wideband lc1 guage but adaptronic is not reading the same numbers as the guage is.. Is there some way to calibrate adaptronic? They can do a manual tune to it. But they said they would prefer the self tuning features.
Autotunes are ok and all, but hearing something like that might make me think about taking my car elsewhere...

Good luck sorting your problem.
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Old 05-18-2010, 09:59 PM   #5
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great thank you guys!...should my oxygen sensor type in the analogue type be bosch or uego?... would this make a diffference in the range difference
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Old 05-18-2010, 10:12 PM   #6
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Quote:
Originally Posted by TurboRoach View Post
Is the lc-1 hooked up via the second serial connection or analog? Which LC-1 output did you connect to the gauge and how is it calibrated? Did you calibrate the LC-1 when you put it in?

The info Sam posted is good for analog.

If you're using the serial connection then make sure that on the 'Special Functions' tab that the LC-1 is selected for the 'Second Serial Port'. If that is correct then I would trust the value that the Adaptronic is seeing over the gauge value, unless it is really strange.


I did a free air calibration with the o2 sensor before i put it in the exhaust which was recommended. And also i just followed the instructions on how to put the lc1 in with the guage... i am using a serial cable to read the afr with the ecu... Should i use an analog? if so do i just tap into one of the wires of the adaptronic ecu?
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Old 05-19-2010, 12:36 AM   #7
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No. Set the spare serial port to LC-1. I had the same issue. Doing this will correct it.
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