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This is how it sounds in the sim from trackside - flatulence and all

No edits or fudging, just a static camera view. The sound is not finished yet and the onboard is still receiving the final polish.
As you can hear there are a lot of sounds going on in this hybrid system - harvesting whines, rattles and turbo noises. The flatulent sound is the MGU-H keeping the turbo spun up as a form of anti turbo lag (my wife's turbo diesel needs this tech badly).
There are 3 complete sonic models for this engine for cockpit, onboard/chase and trackside/distance. This engine is made up of multiple layers but most notably onload, steadyload and offload layers across the RPM range. Plus all the other sounds that need to be hooked up.

Anyway....this is probably my first post in my new role at iRacing so here's some info. If you haven't heard I'm now focusing exclusively on iRacing. I'll be pushing for a better sonic experience as hard as I can and the whole team are eager to support that, hence the reason Steve Myers begged me like a little girl wanting a pony, oh and thanks for the case of Shiraz and a subscription to “The Modern Drunkard” magazine.

On a serious note though, the goal is to develop a more authentic sonic experience and to better communicate the physics and environment. Every aspect of the audio system (including the actual sounds) should serve as sonic clues to deliver useful information to the sim-racer for a greater sense of connection. For example the new particle system for debris and backfires events requires a range of sounds for every permutation the physics can produce. There are 100's of particle sounds for each surface (grass, dirt, marbles, gravel traps) and 1000+ backfires because most are unique to each car. This all makes the whole experience livelier.

We've made changes to tire skid thresholds so the progression to skidding is smoother and communicative about grip levels. The surface sounds have been totally remixed and there are some new engines on the way. I'm pretty excited by this next build and the sounds have really taken the next step. Steve didn't say in his blog but the Ford based stockcars will finally have their own voice and I have source for the Toyota engine sound sitting here ready to be built.

We are drafting an audio road-map and fleshing out ideas that will take the sound of iRacing to a whole new level - very exciting!

Hope you like the MP4-30 sound clip!