Engine Responsiveness

So in the latest patch it was stated that there is a line of code added to control engine responsiveness. Has anyone figured it out?

I've been tinkering with it. Lower the engine response value for a faster revving engine and increase the clutch value for a slower clutch engagement. I found a fun combo of engine at 0.1 and clutch at 3.5. This way there's a lot of engine spool up before the clutch engages. You can either slip it that way or rev it up and "pop" the clutch.