Fuel cutoff w/ Stock ECU + MBC. Click through for a video example of the Volvo ECU cutting fuel after the parameters go off the map.
Now that ambient air temperatures are very low, 9°F (-12°C), the air-fuel mixture is so dense that it’s going off the ECU’s map, and my Volvo’s computer is shutting down the party.
It happens at low speeds also, any gear, typically when boost reaches 17-18psi.
Notice the cuts happen immediately and are terminated as soon as paramaters are normal, in these cases, milliseconds after each cut. In other words, there is no return-to-normal lag or penalty.
I’ll get an additional low-speed example up soon. It’ll be easier to see and hear.
I shot an email over to my favorite Volvo speed genius Lucky, of Active Research & Development, formerly of iPD, MVS sponsor. He was happy to give his thoughts on the question Chip or Manual Boost Controller? Now, I know what you’re thinking: he runs a chip tune company! Of course he’ll favor chips! Yes he runs a chip tune company, but he’s known throughout the Volvo world as a fair, honest tuner. I’m more than comfortable letting his words rest on his reputation. Disclosure: ARD is not a sponsor here, and I don’t own any ARD equipment. I do have a manual boost controller in my 850 T5. The following are Lucky’s words with my headers to break up the text, and give the context of my questions. Chip or MBC? MBC’s are great…