I spent hours tuning and building exotic engines. 6 liter turbo inline 3? 1 liter NA V12? Only your imagination is the limit.

[1] https://www.youtube.com/watch?v=xQpfvliszx4

Bonus: You can export your vehicles directly in BeamNG.drive and test them on the track.

I hope you step on a Lego.

you'll also figure out why things like a v12 Honda civic don't pan out ;) (looking at you dodge hellcat.)

For the gotchas - I'd guess that the exhaust manifolds would make a huge difference in terms of sound, and they seem hard to simulate. For example, engineers tune the individual per-cylinder exhaust distance - this way, the exhaust fumes from each individual cylinder align nicely once the exhaust from each cylinder merge into the final exhaust pipe. Otherwise, if, for example, the firing pattern is 1-5-..., then the air from cylinder 1 might arrive to the exhaust pipe at the same time as air from cylinder 5, given high RPMs and limited speed of sound.

And the fluid dynamics of the cylinders are something that is extremely critical to modern cars, too. And I'd guess that this is where things like misfires can be simulated.

Disclaimer - this is all based on my highly unsophisticated mental model,

"Why are the 2023 Acura Integra's Exhausts Are Shaped Like Curly Fries?"

https://www.integratalk.com/threads/why-are-the-2023-acura-i...

Excerpt:

By snaking the exhaust piping into that circular route, Honda is lengthening the exhaust pathway, lowering the resonance frequency without using a traditional muffler . Honda engineers tell us that the design as first installed in the Si also emphasizes the 300Hz to 600Hz frequencies "to deliver a more aggressive sound." Skipping the muffler, Honda also was able to achieve that sound with a 27-percent increase in exhaust flow.

I bet this saves the money, too; a muffler is an extra component you need to source and/or build. Bending some extra pipe seems a lot cheaper.

Now hold on, extra length on the exhaust manifold / headers are not going to reduce sound so much you don’t need a muffler. And the muffler is far from the most expensive part in the exhaust system, which would be the catalytic converter.

And if that was the Lv 1, this is the Lv 99.

https://news.ycombinator.com/item?id=26991300

This has nothing to do with tolerance, but yeah I’m not talking about rattling either, just vibrations.

Unless you have a V8, where all this unbalance is cancelled out by opposing movement on the other side of the engine.

Description:

> Engine Simulator Codebase [Temporarily Private]

My most generous guess is that he got hit by a patent claim. I can’t think of any other reasonable reason for him to take back the code but keep the video up.

> UPDATE: I've received way more interest in this project and the codebase than I anticipated and I've made it temporarily closed-source. I may release it publicly again but I really want to make sure that my work isn't used without crediting me. Thanks for understanding bros!

If he wants to exercise maximum caution, he should put AGPLv3 on it. He can always change it at any time later, since he’s the sole copyright holder.

https://motorandwheels.com/cars-with-active-sound-design/

What is this nonsense, who wants to live in the matrix?

I chose the red pill. I jubilantly drive a stick shift car with a radio that has a cd player and buttons. Not a single touchscreen in the car. It has an engine, I hear it the organic way, through the transmission of vibrations from its operation straight to my ear holes. Not through a computer that plays a sound sample based on the position of a sensor on the throttle.

Oooh, look at you with your fancy radio! My car doesn't even have a synchro on first gear, and you've got a cd player. I bet you've got luxury roll up windows instead of side curtains, and signal lights instead of trafficators, huh? ;)

Needless to say I disabled it.

> UPDATE: I've received way more interest in this project and the codebase than I anticipated and I've made it temporarily closed-source. I may release it publicly again but I really want to make sure that my work isn't used without crediting me. Thanks for understanding bros!

Maybe it's too soon to start distributing copies.

Thanks.

credit to /u/isaacimagine

https://news.ycombinator.com/item?id=32370989