2gbaroinputworkaround
Differences
This shows you the differences between two versions of the page.
|
2gbaroinputworkaround [2008/01/23 07:47] 76.100.119.159 created |
2gbaroinputworkaround [2024/03/15 11:16] |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ====== Overview ====== | ||
| - | |||
| - | When using something like a MAF translator that allow using DSMLink's Ignore IAT/Baro feature, the ECU's baro sensor input can be used for some aftermarket sensor such as a MAP sensor or a wideband O2 sensor. However, the baro input of the 2G ECU may not be compatible with the aftermarket sensor. The 2G ECU has a 3.3K ohm pull-down resistor (R39). This may put more load on the sensor than it can tolerate and still put out a proper signal. For example, a GM 3-bar sensor can only drive this input to 1.76 volts at maximum pressure. The new Delphi sensor seems to have a bit lower output impedance and will drive the 2G baro input to a little higher voltage at maximum sensor pressure, but it's still unsuitable. | ||
| - | |||
| - | Short of removing R39 from the ECU (described below), the 2G baro input is suitable for use only with very low impedance sensors (even a 50-ohm output impedance will produce a little over 1% of voltage offset). Since most sensor designs have a resistor in series with its output for protection, the 2G ECU's baro sensor input is probably not suitable for use with most sensors. | ||
| - | |||
| - | The 1G baro input doesn't seem to be subject to this problem. It has an input impedance similar to the 2G MDP sensor input's 100K ohms). | ||
| - | |||
| - | **12/19/2007:** Instead of this process, you can also consider using the [[ECUInputData|buffer circuit]]. | ||
| - | |||
| - | ====== Process ====== | ||
| - | |||
| - | If you're really looking to maximize inputs, you can consider removing R39 from the underside of the ECU board. Best to use a couple small-tip soldering irons for this. Heat 'em up, apply one to each side of the resistor and slide it right off. I'm including a picture of the location of the resistor of interest below. I have verified that this does allow a GM 3bar to drive the baro input just fine. Once you have done that, you can use either the baro or the intake air temp inputs for whatever you want. | ||
| - | |||
| - | {{http://www.dsmlink.com/images/forums/2gbaro.jpg}} | ||
2gbaroinputworkaround.txt ยท Last modified: 2024/03/15 11:16 (external edit)
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
