DIYEFI.org Forum

In the Bosch 4.9 datasheet section 4.3.1 Well, 4.3.1 in my Bosch Technical Customer Information sheet (Y 258 K01 036-000e 13.07.2007) refers to vibration testing of the 4.9 sensor, which I doubt is what you are referring to. 4.3.1 Sinusoidal vibration test acc to IEC 68-2-6 test Fc Test equipment: ...

I had a closer look at the picture of the your testing rig, initially I thought it was only a partial picture because a certain part which I always assume necessary was not there, however it is clear to me now that the picture you posted is the complete testing rig. You have an issue with your test...

The quote of 50-75ms is not particular to PID control topology. Basically you run your controller until you reach some kind of steady state where readings are stable, you scope the feedback line (black line) and you observe changes on that line in response to the a pulse of exhaust gas. Based on th...

From my own work testing the dynamic response times of the just the Bosch LSU 4.9 sensor 17025 model, it is in the order or 50-75ms. It takes approximately 50-75ms for the the feedback line on a 4.9, black wire, to show change when AFRs changes suddenly, the wideband controller tracks the feedback ...

where is the gas going after it hits the o2? Is it venting to atmo though the holes that the o2 sensor is connected to? Yes, there are 5 open holes around the peripheral of the sensor boss, the gas flows out those. The gas flow is low, only about 2L/min so there is almost zero pressure buildup/drop.

I'm interested in what your test rig looks like, care to share? The goal for this tester was to try to come up with some method of getting repeatable system response measurements. I had built a few before but they were overly complicated and really just a PITA to work with. My latest version is a d...

I notice lots of references to CO2 or test gas or lack of test gas used for O2 sensor testing. I always wanted a desktop test rig that I could access whenever I wanted while using my main computer, without going down to the shop to get to the huge custom-mix bottles we have down there. Turns out the...

Sorry to revive a thread from a couple months ago but this thread is actually pretty good so it wouldn't have stayed down for long anyway. A little more on the new AEM units. From poking around a bit... 4. It is EXTREMELY fast to respond. Especially given how clean the signal is. The instruction she...

Hello All, My name Is John and I am an engineer with the non-free AFR Gauge and ECU company AEM. (but don't hold that against me. :lol2:) I have been doing engine electronics seemingly forever and have been racing for the last 20+ years. Used to work for Honda doing IndyCar stuff back in the 90's wh...