How does the 787B get that epic sound?

[88deathguy]

I think it's the TURBO OVERLOAD

Post theories about said subject

 

[locoman88]

i personally dont really like the 787b sound.... sounds kinda funky to me... but its OK... i like the real sound better

 

[Cappachihngo]

@ 88death: It has the legendary R26B 4-rotor engine. Listen to this (turn volume down)
@ locoman: I use to hate that sound too but after listening to it it grew on me.

 

[Machate-man]

It's because it's a rotary motor; a 3rotor engine like that would make a high-pitched sound similar to that.

 

[fbccars924]

bc it runs on the pure essence of Chuck Norris.

 

[Turtle]

It's because it's a rotary motor; a 3rotor engine like that would make a high-pitched sound similar to that.

^ This.

bc it runs on the pure essence of Chuck Norris.

But this too.

 

[mikecustom]

its the rotors, you can hear each one of them in person as the car is flying by at max speed, you hear a constant growing sound and at the same time you can a hear decreasing scream, and one that increases and decreases the closer it gets to you, this mix of sounds make kind of like a mistical spectrum sound, its just not a high pitched scream, its like the car has multiple voices in it, its a mix of drama and agressiveness, beautiful.... see it in person, you'll cry, lol, it makes me feel as the v12 F1s did, is something so special its no longer a sound anymore, its an emotion,, its like the car is transmiting its feelings to you

 

[88deathguy]

For me, it's the souls that have been lost at Le Mans, from 1955 and all the other years. Their screams of agony radiate throughout the car, driving it with the grief and anguish powering the car to its maximum capabilities. The engine's shrieks of the lost souls and sheer power are what drove it to such an epic victory in 1991...

 

[Schwartz]

I'm going to bronze that post and frame it, okay?

 

[Vegard]

It's because it's a rotary motor; a 3rotor engine like that would make a high-pitched sound similar to that.

It's actually a 4 rotor.

 

[Pupik]

For me, it's the souls that have been lost at Le Mans, from 1955 and all the other years. Their screams of agony radiate throughout the car, driving it with the grief and anguish powering the car to its maximum capabilities. The engine's shrieks of the lost souls and sheer power are what drove it to such an epic victory in 1991...

I think this wins GTP's Bad Taste Award.

 

[Moontallico]

It's actually a 4 rotor.

He knows that. He's just stating that 3 rotors engines have a similar sound to those with 4.

 

[MOTORTRENDmitch]

For me, it's the souls that have been lost at Le Mans, from 1955 and all the other years. Their screams of agony radiate throughout the car, driving it with the grief and anguish powering the car to its maximum capabilities. The engine's shrieks of the lost souls and sheer power are what drove it to such an epic victory in 1991...

Beyond further review of your post..

 

[zedextreme8177]

I really think the 787B's sound is overrated in-game. It sounds like the real thing on idle, but above 4000rpm

For a comparison:


Oh how I wish it actually sounded like that in-game

To remain on topic, it sounds like that because it was built by aliens...

 

[locoman88]

I really think the 787B's sound is overrated in-game. It sounds like the real thing on idle, but above 4000rpm

For a comparison:
<a href="http://www.youtube.com/watch?v=81zhOQ5PvaE">YouTube Link</a>

Oh how I wish it actually sounded like that in-game

This

 

[Morgoth_666]

I really think the 787B's sound is overrated in-game. It sounds like the real thing on idle, but above 4000rpm :yuck

[vid removed]

Oh how I wish it actually sounded like that in-game

Yeah it is a bit off at high RPM. It would still at least sound cool if not for the looping.

I'd love to get the chance to hear what it really sounds like, as I'm not sure if you actually can properly record all that. I know I've never heard a recording or TV broadcast of the 3-rotor engines in Grand Am that sounds even remotely similar to the glorious sound they produce in person. I suppose the premium GT300 RX-7 sounds kind of sort of like the horrible aborted version of that sound you get on TV (not sure how similar the actual engines are).

When truly live it almost sounds like it must be from another planet. Boy am I going to miss those fake RX-8s, wish they'd been included in GT5. I can only imagine how much "more" there would be to the sound of the 787B or the other prototype who's name I always forget.

I must have quoted before the "aliens" bit was added.

 

[Slash]

Sounds almost like a pushrod stroker.

 

[georgetigra]

It's actually a 4 rotor.

and the engine is 2.4L!!!

 

[kennylmao]

because ROTARY.

 

[Left Turn]

I would post the aliens guy meme but i'm too lazy.

The engine in the 787B in GT5 is not as good as the real car, but that being said it's the one of the best in the game!

 

[Griffith500]

and the engine is 2.4L!!!

The specific geometry of the Wankel rotary means that its nominal displacement is misleading when compared with ordinary four-stroke piston engines. See here for an in-depth, illustrated description (e.g. start here, and go "back"); for reasons explained in that link, Wankels, like two-strokes, should be considered as having twice their nominal displacements (in 1986, the Mazda 757 was classed as having a displacement of 654x3 x 1.8, i.e. 3.5 litres instead of its nominal 2.0 litre capacity.)

So the effective displacement of the 787B should really be considered as 4.7 - 5.2 litres (the R26B in the 787B has a 2.6 litre nominal displacement, not 2.4), if you're trying to compare it to other engines. This also better explains the "high" fuel consumption of rotaries.
There are other complications, related to the way that torque is delivered (and "consumed") over a full cycle, which means that, technically, you shouldn't compare, say, a six-cylinder engine to a four-cylinder engine, but these are very minor differences by comparison.

Anyway, the sound is unique because there are twice as many pulses per revolution of the output shaft (like a 2-stroke, but without the zingy, resonant individual exhausts) and because of the way the ports are opened, allowing for rapid pressure equalisation of the working chambers through both the intake and exhaust (like a "piston-ported" two-stroke.)
The 787B revs to 9k, which is equivalent to an inline four revving to 18k (or a V8 to 9k, also), except it sounds much crisper because of the sharper / harsher pulse shape (taken from here). The older 13G and 13J engines show that there is in fact a distinct difference between 3-rotors and 4-rotors, in exactly the same way that there's a difference between conventional inline-3s and inline-4s.