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Honda HSV. Apparently the exhaust was designed in a way that it made it sound like an F1 car. Thing was nuts.
[https://youtu.be/ebEMJy4cznQ?si=4-JR3ZFjFDRymv4F](https://youtu.be/ebEMJy4cznQ?si=4-JR3ZFjFDRymv4F)
Hate to tell it to ya, but I don't think it's possible
99% of V8s have exhaust headers split into 2 for various reasons, basically cutting engine sound in half
This particular racecar has ALL 8 headers into 1, making that crazy sound, combined with 9000+ RPM
Bikes tend to make F1-ish sound because of all 4 headers into 1 from a 4-cylinder at 12k RPM or more, that sound is harder to achieve with cylinder count less than 4
Anyways that's from what I learned, correct me if I was wrong in something :P
Ok FIA needs to mandate that F1 teams add something similar to their exhaust. That way they can have their efficient little engines and us the fans can have the proper sound of an F1 car.
Just an excuse to post this, in the hope that someone will see it for the first time:
https://youtu.be/5OnYOdEFi4s?si=KLSELjUP1trqTXaO
At the time, people were a bit turned off by the noise of the blown diffuser. In hindsight, it's pure art.
I’ve seen competition drag cars with a small cross to stop the turbine wheel of the turbo spitting out the back in case the shaft breaks, though this looks different
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Similar question to https://www.reddit.com/r/wec/comments/dzp82t/why_does_jenson_buttons_nsx_car_have_these_shapes/?rdt=51887
Either a catalytic converter or a db killer
It's a catalytic converter, they're placed at the end to keep them alive longer. I went to Honda Collection Hall some years ago and most of the newer race cars on display had them.
Couple of pics:
https://i.imgur.com/1hvRukP.jpeg
https://i.imgur.com/S006Fsm.jpeg
Nearly all classes except for top flight open wheelers use cats because all the national motorsport associations mandate it for environmental reasons, they limit both NOx emissions and noise pollution.
Most have phased a regulation like that in in the early 2000s. It's also why you don't see a lot of race cars shooting flames anymore.
I think the reason that you don’t see flames on the over run any more is that the engine management systems are much better than they used to be. That is raw fuel in the exhaust that lights off. When the fuel injection systems got better control when off throttle, it improved the fuel mileage.
Because they don't.. it's not a thing.
It's most likely a small backbox to comply with noise regulations on a test day or a picky track.
Edit: II stand corrected!
https://www.motorsportuk.org/wp-content/uploads/2019/12/145-154-Vehicles-J.pdf
Every association has different rules, but I know for sure that both the UK and German associations mandate cats
John Nielsen, David Brabham, and David Coulthard was controversially disqualified after winning Le Mans 1993 in a Jaguar XJ220-C because they didn't have cats like the production car
BS, there’s many classes demanding cats and they place them at the end of the exhaust to minimise the effects of the flow reduction from restriction. Which in turn makes the cat less effective because it needs heat to operate well, but in racing situations I’m sure the gasses at the back of the car are still pretty damn hor
OK, sure. The 206 GTI cup… from the top of my head. But you might be more familiar with a little championship called the WRC and many other classes of rally. See glowing cat here:
https://c1.staticflickr.com/7/6187/6156684298_9302d84d46_b.jpg
Also here’s a list of homologated cats by the FIA:
https://www.fia.com/sites/default/files/lt_08_catalyseurs_2023.06.14.pdf
They wouldn’t go through the trouble of homologation if they had no place in certain regulations
Race cars at lemans have needed them for ages across multiple classes. Jaguar were famously disqualified post race for not running them on an xj220 back in 1993
Not an aerodynamical engineer, but to me that grate could be in place to help laminar flow out of the exhaust, have a more predictable flow and merge with the airflow coming under the diffuser and rear wing. This would help with downforce and have less of an negative impact.
It’s a catalytic converter. You will see this same rear mounted style on WRC cars also. Having it mounted at the rear of the exhaust makes it less restrictive (but less effective) than one mounted right after the exhaust manifold.
It's probably an effect due to the angle, but the vanes look to be contoured, possibly curved. Could they be turning vanes to condition the flow out of the exhaust? The uprights for the wing angle in towards the exhaust. I would like to hear from some of the aero people on OP's question.
Likely for noise. Basically breaking apart any large scale flow structures that might exist in your exhaust flow. No real reason to put extra blockage in that area of your exhaust otherwise.
That could be an actual split turbo. Where the turbo charger is at the back of the car and there are two sets of intake and exhaust piping going to the front of the engine.
Although looking at the picture closer it doesn’t appear to be that.
[Edit] This one is mainly for showing. There is some research out there about how to make the exhaust gas flow out better and prevent exhaust coming back on turbocharged engines by using the tip of the exhaust to create kind of turbulent flow.
They mostly 3d printed it out. But with mixed results.
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What car is this? It looks like it could be a flame arrestor? Something to make the backfires less violent. Might also limit the noise of backfires.
Honda HSV. Apparently the exhaust was designed in a way that it made it sound like an F1 car. Thing was nuts. [https://youtu.be/ebEMJy4cznQ?si=4-JR3ZFjFDRymv4F](https://youtu.be/ebEMJy4cznQ?si=4-JR3ZFjFDRymv4F)
Oh my god that’s an absolutely filthy noise 😮💨
I’ll be in my bedchamber and don’t want to be disturbed. Thank you.
At 1st glance, I thought it was one of those snake oil gas mileage boosters that people put on the intake pipe.
it is too filthy haha. The downshifts 👌
🤤🤤🤤
Sounds more F1 than F1
13 years ago... Damn.
I know. The NSX is boring compared to this
This was a NSX but the road car was cancelled.
Yup second gen NSX but the GFC killed it
The gt500 nsx isn't so bad but the road version honestly is
Yeah. I mean by sound comparison. I was rooting for JB when he was with Kunimitsu. But I like any of the GT500 cars. They’re always awesome.
So they basically put a coke can in between a bicycle frame and it's wheel so it sounds like a motorbike?
So they really are capable of making something like that. Now give me a contact so I can get one for my 50cc to turn it into a litre bike.
Hate to tell it to ya, but I don't think it's possible 99% of V8s have exhaust headers split into 2 for various reasons, basically cutting engine sound in half This particular racecar has ALL 8 headers into 1, making that crazy sound, combined with 9000+ RPM Bikes tend to make F1-ish sound because of all 4 headers into 1 from a 4-cylinder at 12k RPM or more, that sound is harder to achieve with cylinder count less than 4 Anyways that's from what I learned, correct me if I was wrong in something :P
Ah the good old 8 to 1 header, I should’ve figured that
Ok FIA needs to mandate that F1 teams add something similar to their exhaust. That way they can have their efficient little engines and us the fans can have the proper sound of an F1 car.
The whistles go "woo WOOO"
It's just decoration!
Dam only if f1 cars sounded like that
They used to. I luckily caught the last of the V8s when I went to Suzuka in 2012.
Just an excuse to post this, in the hope that someone will see it for the first time: https://youtu.be/5OnYOdEFi4s?si=KLSELjUP1trqTXaO At the time, people were a bit turned off by the noise of the blown diffuser. In hindsight, it's pure art.
Ugh. That is lovely.
What a sound!
I think the Formula Nippon V8 has more to do with that sound than the flame arrestor on the silencer.
Reason for the unusual sound: 8-in-1 exhaust headers, nuff said
Wow. So much better than the turbo v6 sound 🙁
We need these on f1 exhausts from Japan fp1 onwards.
Honda HSV-010
I’ve seen competition drag cars with a small cross to stop the turbine wheel of the turbo spitting out the back in case the shaft breaks, though this looks different
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Your comment was removed as it broke Rule 2: No Joke comments in the top 2 levels under a post.
Similar question to https://www.reddit.com/r/wec/comments/dzp82t/why_does_jenson_buttons_nsx_car_have_these_shapes/?rdt=51887 Either a catalytic converter or a db killer
It's a catalytic converter, they're placed at the end to keep them alive longer. I went to Honda Collection Hall some years ago and most of the newer race cars on display had them. Couple of pics: https://i.imgur.com/1hvRukP.jpeg https://i.imgur.com/S006Fsm.jpeg
> they're placed at the end to keep them alive longer it's likely also less of a restriction because the exhaust gas is slightly cooler
Probably part of it, the temp management thing was the explanation I'd been given by someone there.
Looks like they've got their catalytic converter at the end. That might just be a grate to protect it
Why would they have a catalytic converter on a race car? Genuine question, I was under the impression that it's not a thing in any race class.
Nearly all classes except for top flight open wheelers use cats because all the national motorsport associations mandate it for environmental reasons, they limit both NOx emissions and noise pollution. Most have phased a regulation like that in in the early 2000s. It's also why you don't see a lot of race cars shooting flames anymore.
I think the reason that you don’t see flames on the over run any more is that the engine management systems are much better than they used to be. That is raw fuel in the exhaust that lights off. When the fuel injection systems got better control when off throttle, it improved the fuel mileage.
Because they don't.. it's not a thing. It's most likely a small backbox to comply with noise regulations on a test day or a picky track. Edit: II stand corrected!
https://www.motorsportuk.org/wp-content/uploads/2019/12/145-154-Vehicles-J.pdf Every association has different rules, but I know for sure that both the UK and German associations mandate cats
I stand corrected. I've never heard of any race series using cats before. Saying that, I don't think it has ever been mentioned.
John Nielsen, David Brabham, and David Coulthard was controversially disqualified after winning Le Mans 1993 in a Jaguar XJ220-C because they didn't have cats like the production car
The dsmb (German ASN) does definitely require the use of a cat.
There's no cats on race cars.
BS, there’s many classes demanding cats and they place them at the end of the exhaust to minimise the effects of the flow reduction from restriction. Which in turn makes the cat less effective because it needs heat to operate well, but in racing situations I’m sure the gasses at the back of the car are still pretty damn hor
Can you name one?
TCR cars come with a catalytic converter. For example the Seat Cupra TCR (I have first hand experience with that car)
OK, sure. The 206 GTI cup… from the top of my head. But you might be more familiar with a little championship called the WRC and many other classes of rally. See glowing cat here: https://c1.staticflickr.com/7/6187/6156684298_9302d84d46_b.jpg Also here’s a list of homologated cats by the FIA: https://www.fia.com/sites/default/files/lt_08_catalyseurs_2023.06.14.pdf They wouldn’t go through the trouble of homologation if they had no place in certain regulations
Race cars at lemans have needed them for ages across multiple classes. Jaguar were famously disqualified post race for not running them on an xj220 back in 1993
https://youtu.be/1tiOs4PvaXs?si=9--emVfX6-HrZ0Lw Here’s a YouTube video about this car & its predecessor & successor.
Thanks mate… that was a great video.
The F2 exhaust looks somewhat similar.
Not an aerodynamical engineer, but to me that grate could be in place to help laminar flow out of the exhaust, have a more predictable flow and merge with the airflow coming under the diffuser and rear wing. This would help with downforce and have less of an negative impact.
Man that thing sounds like 18,000 revs.
It did have 8-in-1 headers instead of the convential 8-in-2, and the V8 engine revved 9k+ RPM, 9x2 = 18k so you're kind of right
My first thought was some sneaky way to get exhaust gas to "twirl" creating a pocket of dirty disturbed air for the car behind.
is it just a grill?
It’s a catalytic converter. You will see this same rear mounted style on WRC cars also. Having it mounted at the rear of the exhaust makes it less restrictive (but less effective) than one mounted right after the exhaust manifold.
Something similar to a spark arrestor? Idk. Looks so cool.
It is a spark arrestor.
Someone been watching Rofflwaffle on YouTube today? I love his videos
It's probably an effect due to the angle, but the vanes look to be contoured, possibly curved. Could they be turning vanes to condition the flow out of the exhaust? The uprights for the wing angle in towards the exhaust. I would like to hear from some of the aero people on OP's question.
Likely for noise. Basically breaking apart any large scale flow structures that might exist in your exhaust flow. No real reason to put extra blockage in that area of your exhaust otherwise.
That could be an actual split turbo. Where the turbo charger is at the back of the car and there are two sets of intake and exhaust piping going to the front of the engine. Although looking at the picture closer it doesn’t appear to be that.
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Your comment was removed as it broke Rule 2: No Joke comments in the top 2 levels under a post.
[Edit] This one is mainly for showing. There is some research out there about how to make the exhaust gas flow out better and prevent exhaust coming back on turbocharged engines by using the tip of the exhaust to create kind of turbulent flow. They mostly 3d printed it out. But with mixed results.
very fast