Serial vs analog wideband input

I normally use the serial input on my Innovate wideband for my PE tuning, but since I also have the analog input option, I decided to compare them. On my channel list, Innovate sp is the serial input, and MPVI. 2 is the analog input. You will notice they do not exactly track each other, and the difference is not always in the same direction. I am curious if this is a difference in the actual wideband output or a difference in the polling intervals HPT uses for them. Ignore the slow narrowband switching and the transient issues I have not fully cleaned up yet.

You should video the gauge face and HPTuners scanner at the same time.

Go back and pause the video at different points and figure out who is off. I'd expect it to be the analog out side.

The only wideband analog out I've found to be as the manual says it is.. are the AEM's Some of them differ by so much. Some differ for the same exact wideband when you take it to another car.

Quote:

---

Originally Posted by Alvin

You should video the gauge face and HPTuners scanner at the same time.

Go back and pause the video at different points and figure out who is off. I'd expect it to be the analog out side.

The only wideband analog out I've found to be as the manual says it is.. are the AEM's Some of them differ by so much. Some differ for the same exact wideband when you take it to another car.

---

I am not running a gauge in this test. This is the HPT scanner with both the serial and analog wideband outputs going directly to the scanner from the same wideband at the same time.

to me it looks like serial updates faster (look at parts of the log where you go WOT/enter PE) and the analog signal is a little more noisey. also very likely the analog signal has a bit of a ground offset, making it less accurate. I'd use serial in this case.

Quote:

---

Originally Posted by aaronc7

to me it looks like serial updates faster (look at parts of the log where you go WOT/enter PE) and the analog signal is a little more noisey. also very likely the analog signal has a bit of a ground offset, making it less accurate. I'd use serial in this case.

---

I always use the serial. This was just a curiosity test to see how accurate the analog input could be. I expected to see some amount of offset in one direction or the other, but did not expect to see swings in both directions at the same AF ratios. Also, I never gave it much thought, but the polling speed option on the serial input and the analog inputs is greyed out. It is selectable on the parameters from the vehicle computer.