AMPEFI Undercover: A Look Inside MS3Pro Ultimate’s Programmable Peak & Hold Injector Driver

[@aaroncake]

That was cool. I haven't looked at injector PWs with a scope before. Now I'm going to go scope my RX-7 (running an ancient Microtech LT8s...but soon to be MS3-Pro) and see what it looks like.

[@bernhardlist9359]

I have to agree with the previous post. The pintle closes at the pintle hump after the voltage spike. You must subtract that „overspray“ time from the dead time since the ECU thinks the injector is closed while it still keeps spraying fuel. So initial „dead time“ minus the overspray time is the correct dead time that you have to enter in tuner studio. Greetings from Germany

[@jamesgeorge6551]

Very good explanation of what is happening during the injection event, with regards to current and voltage, also, at the 5:12 when you show the current change ,where the pintle lifts off its seat, you can also see when/where the pintle comes to rest in the voltage (pink) trace as it comes down from spike you see a little hill, before settling at 14 V, thats called "pintle bump".

[@slopoke22]

Good video

[@leisryan]

Does MS3-PRO ultimate have active flyback on all 8 peak and hold injectors..?

[@GlennHolden]

Nice explanation! A question: What's the primary reason for peak/hold? I assume to get the injector fully opened as quickly as possible?

[@TheChrisey]

Yes, Get the needle moving as fast as possible, and then limit current so it doesn't burn out the coil and mosfet.

[@taberl]

Do you have any ocilliscope examples for an ms3x using pwm for comparison?

[@In3xorable]

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