Being a bit of a HPT newbie, thanks in advance for the help.
Using V3.6.16 downloaded earlier this week. New Ballenger AFR 500V2 standard connected to a 2011 EIO. The tune is essentially a 1bar MAP, Lingenfelter MAF, LS6 supercharged. All is retrofitted into a 1968 Camaro. The ECM has worked flawlessly since 2008, retuned for TVS1900 in 2010.
The problem is what appears to be noise in in #4 I/O. See screenshot below, lavender line for MAP.
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The early time index with the smooth line is engine off. When the "noise" starts is engine start. However, the green I/O plug is disconnected at all times.
First thought, grounds. Commonizing the serial port, interface, etc. to a single battery negative yielded no change.
Oscilloscope readings on the IGN power to the OBDII connector also showed no significant differences than the battery.
A new cable from the interface to the laptop: no change.
When attaching a pressure sensor to #4, the "noise" gets worse (amplifies.) It will also occur at KOEO with no other inputs on I/O #1-3 but the ground still connected from #5 to OBDII to BAT-.
With the green connector disconnected, grounding I/O #4 just pulls down the noise, it does not cancel it.
I/O #2-3 are fuel pressure sensors. These too tend to be noisy when the car is running. Disconnecting them completely from the interface and grounds changed nothing on I/0 #4.
It does not appear that the polling rate for the I/O's can be changed, so possible smoothing by going to a lower frequency seems to be out. The "noise" should still not be occurring.
I'm open to trying anything.
Thanks for the help.
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Originally Posted by Keith@HPTuners
