DIYEFI.org Forum

You also have the calibration resistor in parallel with the 62 ohm resistor.

But you are right, 4.16v is more than enough. I still have the conviction inside of me that 5v operation is more desirable, though I can not think of why.

All good stuff. So, you don't use a PID pump current. And you don't use a constant current PWM ( like Innovate and AEM ) ? Something in between ? Spartan 2 used PID pump control. Spartan 2 should be a bit faster than the average wideband that uses PID pump control. My prior post, I gave the impress...

If you could transport exhaust gas instantaneously into the sample chamber, the nernst response to it is almost instanteous, I have measured it to be less than 25us. My gut tells me that it is about 5us. The issue to me is the transportation of the exhaust gas into the measurement/sample chamber. I ...

I contend the test rig they use is very flawed, with that said. Based on the results of the chart http://aemelectronics.com/files/info/AEM_X-Series_Wideband_Response_Time_Comparison_Chart.jpg , I would estimate that my Spartan 2 unit is between zeitronix and daytona sensor unit, so maybe 50ms if Spa...

For for the bung if the exhaust hole is to the outside (atmosphere) rather than back into the exhaust stream, then it would be equivalent to your test rig, well more equivalent than not.

I can not speak with confidence about the bung as I have never studied it or used it. The exhaust clamp depends on a venturi effect to move exhaust gases to the sensor, it is barely a venturi WRT textbook examples of a venturi or venturi based vacuum systems for CNC machining which I do alot of. The...

Ok, that clarifies things.

In the end you do not use a measurement resistor, and if you did; you know that the pump current across the measurement resistor is not the total pump current. In either case, I have no issue.

You are saying that you can fully oxidize or reduce the gas in the sample chamber in a shorter time, much much shorter than anyone else claims about their own wideband controllers, while telling me that you are not violating the current limit? This is a good question and one that cuts right to the ...

Yes could be the FET driver issue, but that is such a simple issue to solve for pennies worth of parts, I give them the benefit of the doubt that it was not that. A normal switching power supply is maybe 85% efficient using value oriented parts, the sensor heater needs roughly 12 watts on average, s...

My impression of the PLX thermal problem was the switching frequency, the frequency was just too high, each time the power supply switched you momentarily run a FET in ohmic region and you generate a lot of heat.