Exhaust Sound

[TheTom]

I think right now the exhaust diameter doesn't change the sound of the engine. Also, there's no difference in how i set the engine up, cause i made 2 1.5L I4s, one tuned to be used everyday and one to be fast, then just to try out i revved them both to 7500RPM and they sounded exactly the same, even though they have completely different set-ups.

[Daffyflyer]

I think right now the exhaust diameter doesn't change the sound of the engine. Also, there's no difference in how i set the engine up, cause i made 2 1.5L I4s, one tuned to be used everyday and one to be fast, then just to try out i revved them both to 7500RPM and they sounded exactly the same, even though they have completely different set-ups.

Ahh, ok, yes that makes more sense, there are some issues with how the exhaust diameter effects the sound I'll check but I think its only the number and type of mufflers that change it currently, but they do change it a LOT. That should also be tied into exhaust diameter too, but I don't think it currently is.

At the moment will be differences in engine sound with how cammy it is, if it has VVT or not, what mufflers is has and how open the intake is.

[09webbad]

I notice a difference in the intake, exhaust mufflers and engine configuration. However can hear no difference with a different exhaust manifold, cam profile or fuel mixture. Also, the bypass valves doesn't affect the sound through the rev range, mufflers or not. Still very accurate sounds though, but just needs a few tweaks.

[Daffyflyer]

Exhaust manifold doesn't have any effect currently. Cam profile has a huge effect on idle sound and a mild effect on sounds at higher revs. Bypass valves should make it suddenly get louder and angrier as at passes 4000rpm.

Fuel mixture makes it pop and bang if you run it way to rich, but besides that I've never heard a real engine sound any different at different fuel mixtures in real life, even when tuning an ecu.

[xABSOLUTIONx]

have to agree with Daffy on fuel mixture, popping depends more on cam profile, valve lift duration and the exhaust manifold

speaking of sound itself, under-square, square and over-square engines make different sounds

for a good compramision BMW's S50B30, S50B32 (BMW E36 M3) and S52B32 (BMW E46 M3)

and listen to Mercedes Benz M104 (300E-24) and Toyota 2JZ (most notable use - Supra)

[Daffyflyer]

speaking of sound itself, under-square, square and over-square engines make different sounds

for a good compramision BMW's S50B30, S50B32 (BMW E36 M3) and S52B32 (BMW E46 M3)

and listen to Mercedes Benz M104 (300E-24) and Toyota 2JZ (most notable use - Supra)

Hmm... ok, what is the difference in sound you propose between oversquare, square and over-square, as in HOW should the sound be different?

I had a listen to a series of BMW S series 6s, some M104 Mercs, some naturally aspirated 2JZs (as the turbo ones of course sound very different) and could find no aspect of the sound that seemed to consistently vary with bore and stroke. The M104 is the most oversquare, and it sounds pretty similar to the square 2JZ, the longer stroke S52B32 sounds slightly more high pitched and chainsaw like, but that seems to mostly be down to exhaust design, as the wildly undersquare Falcon 4.0L Inline 6 sounds just like the 2JZ, but then again other Falcon I6s with more open exhausts sound like the M3 motor again.


It's quite possible to change the sound on the basis of bore and stroke relationship, as that's just a simple parameter for the game to drive, but I can't find any consistent differences in sound that I can attribute to it!

[09webbad]

yeah... maybe I can't hear the cam profile take effect on my computer, but you can hear the engine roar after about 4000 RPM regardless if the bypass valves are on or off. They are the only issues with sound really... I think that vipervader wants to kind of adjust the tone, because the difference between a Ferrari Italia and a Lamborghini Aventador is minimal (despite the Ferrari being a bit revvier) yet they sound competently the same. If you could somehow change the way the car sounds that way then it would benefit the game

[xABSOLUTIONx]

sounds slightly more high pitched and chainsaw like, but that seems to mostly be down to exhaust design

ok, maybe you're right about the exhaust design, but AFAIK, all of them use split manifolds and have 2 pipes going to the back and join only in the back muffler, although not sure about 2JZ, never worked on it

and imho all of them have distinct sounds, like i know when there is a BMW going by or a Merc or some Toyota

[pyrlix]

Some weeks ago I've been reading about Igniton timings and how they can affect the sound of the car. Where as more "advanced" timings would create a "harder" not so smooth sound, while a retart timing would make a very smooth sound.
And yeah... exhaust sound is crazy, you can do so much by manipulating the piping and the system internals etc. etc.

[Daffyflyer]

Some weeks ago I've been reading about Igniton timings and how they can affect the sound of the car. Where as more "advanced" timings would create a "harder" not so smooth sound, while a retart timing would make a very smooth sound.
And yeah... exhaust sound is crazy, you can do so much by manipulating the piping and the system internals etc. etc.

Can't say I've noticed any change in sound when changing the timing on my MX5, except that the idle gets smoother and faster or rougher and slower. I'm willing to believe you're right though

[xABSOLUTIONx]

can the idle on the test bench be tied to the ignition timing btw? just asking

[Manatore]

Will there be any possibility to start and engine incomplete? Like without any manifold? It would be an awesome feature to the game Just listen to it http://youtu.be/OpXwzbZ95hY?t=36s

[Juno8]

Will there be any possibility to start and engine incomplete? Like without any manifold? It would be an awesome feature to the game Just listen to it http://youtu.be/OpXwzbZ95hY?t=36s

... I cant say anything but that did some AWESOME!

but seriously that thing sounds better than the Audi R18 TDI E-Trons from Le Mans which were Silent!

[Daffyflyer]

Will there be any possibility to start and engine incomplete? Like without any manifold? It would be an awesome feature to the game Just listen to it http://youtu.be/OpXwzbZ95hY?t=36s

Jesus, sounds like a WWII Aero engine (not surprising considering they typically just have little exhaust stubs)

[Killrob]

Also, it would be a completely useless feature in the game because no sane person would buy a car with open exhaust... you wouldn't even be allowed to drive them on public roads, let alone be able to start them up without having the police appear within a few minutes. Awesome? Yes... but not in Automation.