evo_lucian wrote: ↑
Thu Jul 02, 2020 5:52 pm
I had bad luck with the DSC VR conditioner not getting sync at start up on the last couple Toyota parallel installs I did. I switched to the max9926 VR conditioner and it worked brilliantly.
jonbill wrote: ↑
Tue Jul 07, 2020 5:41 pm
Good news, looks like I can rev out now, having switched to a max based VR conditioner. I can keep my sequential injector wiring and tune. credit to @evo_lucian
So you know what's going-on here and for future reference; this situation is specific to parallel, vampire, or piggyback installations with shared sensors. Much like shared CLT or IAT sensors, there is conflict in other circuits that add or subtract current or voltage to the signal. Oversimplified; some signal conditioners only "look" at the signal (high-impedance input), and others use or consume signal voltage and current (low-impedance input).
If sharing signals like this, a low-impedance input will alter the signal characteristics between itself and the other parallel circuit, so a high-impedance input circuit is recommended, e.g., NCV1124, MAX992x, LM3xx etc. Nothing wrong with low-impedance conditioners, and they have better attributes for other applications, but they may have impact on other shared circuits in this specific type of application.
Much like selecting injectors or coils for a specific application, conditioners are also not chosen randomly. This is some of the info I wish was included for those shopping for conditioners, but there is too much to consider for an ad space. My suggestion for piggybacks is the improved MiniMAX-A2, but that's mine of course, and others can do as well.