Australia Bi-Modal Exhaust Updates

[smillie]

But what would you expect from a twin turbo car.

Had mine on a bit of a run on the motorway, comfort mode and cruise control just to see what I could get if I behaved.
7.8l/100km for a 200km jaunt now that's not bad.

 

[Terra]

I've heard some that drone and some that don't. If and when I decide to do anything with my car, I will be doing the work myself, including fabricating the exhaust, I can make good power without droning, it a bit of an art to tuning exhaust but understand after market performance parts makers are selling performance so the trade off is exhaust drone.

What brand have you heard that doesn't drone?

If you can make this non droning exhaust, you will be world famous in the Stinger community.....

 

[PxbVic]

What brand have you heard that doesn't drone?

If you can make this non droning exhaust, you will be world famous in the Stinger community.....

Hey Terra,

KIA make a non droning exhaust, so are they world famous?
You seem to be blaming drone on the aftermarket exhausts and yes to a certain degree this is the case, because the aftermarket parts makers are making exhausts the meet the demand of what I like to term, Vanity Drivers, those who love to hear their car, so this is the compromise and the cost of performance, but only to a degree. I liken this to a local kid, with a early 2000s Honda something, and he has a 4 inch rear resonator on it, and that's about all, it sounds weird and probably fantastic to him, but the reality is he's probably taxed the car 3% to 5% in power by lowering the back pressure of the exhaust system which assists in the evacuation of exhaust gasses from the engine, but I'm sure he thinks it sounds good.

The non droning exhaust was in fact a 2.5 inch custom made stainless exhaust, a hand fabricated prototype. And it droned. Drone is low frequency sound and their resonant waves bouncing off the underside of the car and through the body of the vehicle often reflected through exhaust mounts and so on. On that particular car the drone was all but eliminated with better under car sound deadening, and fibreglass exhaust tape wrapping the entire exhaust from front to back, this was a cost of 30KG extra weight on the car.

There are many ways to eliminate drone, and bear in mind I don't know if these can or cannot apply to the KIA yet, I got my car a day ago and now it's a journey of discovery.

Resonator placement and size (and pipe size) all affect exhaust gas harmonic frequencies, Note: the factory KIA exhaust doesn't have any, well not at least that I have perceived in my first day of 350Km driving.

Block the sound tube if it has one, these are common on aftermarket performance exhausts because people who want to mod cars want to hear them, again vanity drivers, the first conundrum of the compromise, most people want a mean sounding (noisy) car, most performance exhaust makers, make mean sounding (noisy) exhausts because the owner demands a good sound, hence drone.

Good quality under-body sound deadening, low frequency sound deadening would help as most cars today lack a good layer of under-body sound deadening. There are many good aftermarket methods to deaden sound.

That nice shinny polished stainless exhaust that the vanity driver want everyone to see, if the exhaust is well designed, then simply wrapping it with fibreglass exhaust tape,will improve the drone as this tape dissipates and absorbs low frequency noise.

Understand how the exhaust is hung from the car, are there opportunities to mitigate sound reflection through these mounts by replacing them with something better? Again the mechanical methods and composition of the exhaust mounts can affect the sound within the car.

I'm always amused about peoples behavior for a couple of reasons.
1: If the car was not perfect out of the box, then why buy it? Why not buy a car that is perfect?
2: While it's OK to modify cars, god knows I love to, I'm always curious of those who so modify cars and are ultimately unhappy with the end result. Was the cars performance not adequate when you bough the car?

Ask yourself why do you modify a car? is it for the sound or for the performance?

Again any change to a standard car, is about compromise, You want it quiet but you want more performance? Sure it can be done, but in the most simple of terms, to quiet a droning exhaust you will need to address the source of the drone and that can be exhaust design or low frequency sound and resonance or a combination of both.

A badly designed exhaust will always sound terrible, that is not to say that any aftermarket exhaust has been badly designed, that is to say to hit the performance point the exhaust maker want to sell their product at, their fans/consumers generally accept they have to have more noise.

Very few actually consider why the noise exists in the first place and what can be done to address it.

 

[Terra]

Sorry my question remains ... What brand have you heard that doesn't drone? (with NO bi modal)

Every one in the forum has been looking for it.

What's the name of your exhaust shop? You sound very qualified to make a great sounding non droning exhaust. (with NO bi modal )

 

[PxbVic]

Sorry my question remains ... What brand have you heard that doesn't drone? (with NO bi modal)

Every one in the forum has been looking for it.

What's the name of your exhaust shop? You sound very qualified to make a great sounding non droning exhaust. (with NO bi modal )

I don't have an exhaust shop, and I don't have a single "go here and buy this answer for you" but at 53 I've known a lot of people in cars, fabrication and machining amongst other technical skills.

As I stated it was a fabricated prototype of a 2.5" stainless cat back system, who built it, a friend who works in a Performance Exhaust shop in Greater Melbourne, who now sell the Australian Xforce Varex system (Google it you will find many shops across AU that sell it and maybe 20 in Victoria that either stock it or can get it in). But I must stress the prototype cannot be purchased. I'm not going to name the person or shop because they are friends and don't want or need publicity. My friends like me are old school (in our 50s) we don't even do ANY Social Networks, but I like one or two forums to pass the time, when those forums are focused on something I have an interest in, hence why I arrived here. Also this is not an endorsement for the Xforce Varex system it's just what the company where my friend works sell today.

Remember the vast majority of consumers want fat sounding exhaust with a performance boost so that comes at a cost, that often manifests itself as drone at constant speed particularly on freeways, and at specific revs where resonance is at it's highest, hence the sound management approach to fixing drone I outlined above.

Also companies who sell high performance exhausts don't really focus on noise mitigation, again the customers usually accept the compromise, so much so it generally will not come up in discussion between the shop and the customer. I'm pretty sure if you walk into any performance parts maker/supplier and say I want more performance but I don't want more noise will pretty much show you the door.

Again the KIA exhaust does not drone. And on a side note, I'm not going to alter that for a while because it may not be required, there seems to be a few tuners who are getting good results with the stock exhaust, but it's too quiet for the fanboys. I actually like the fact it's quiet, I like a car that is a sleeper. I said it in another post a GT car is a refined, comfortable, and a good performance car, The stinger is all this on it's own. So any deviation from this will reduce comfort and generally increase NVH (Noise Vibration and Harshness) none of this is in my opinion befitting a GT car.

I originally said I could achieve the same sound as the bimodal exhaust without drone, and with a bit of fabrication and trial and error I'm confident I could because this would be achieved with only the last pipe and muffler combination. just as the bi-modal sound is achieved with just a set of rear pipes, a resonator, a muffler, a valve and valve actuator.

 

[Stumpeter]

Sorry if this post is in the wrong area, still trying to work it out! I have a query on the GPS Aussie maps, probably been asked before but I can't find it. My MY19 Stinger maps were useless yesterday in a newish suburb , had to use Google maps, I contacted the dealer to get it updated when it goes in for its 3000km checkup, he tells me it's already got the latest update 2017??? . According to Kia map I was in the middle of a paddock hundreds of metres from civilization, but I was actually amongst hundreds of houses in Wyndham Vale Victoria . Does anyone know if its possible to get updates on the SD card from elsewhere?

 

[Ozstung]

Sorry if this post is in the wrong area, still trying to work it out! I have a query on the GPS Aussie maps, probably been asked before but I can't find it. My MY19 Stinger maps were useless yesterday in a newish suburb , had to use Google maps, I contacted the dealer to get it updated when it goes in for its 3000km checkup, he tells me it's already got the latest update 2017??? . According to Kia map I was in the middle of a paddock hundreds of metres from civilization, but I was actually amongst hundreds of houses in Wyndham Vale Victoria . Does anyone know if its possible to get updates on the SD card from elsewhere?

Even with the update mine is close to useless. Unless you get the address spot on it will say it can't find it. There is no pre-emptive feature. This navigation unit sxits me. Give me my garmin any day!

 

[Stumpeter]

Update!! I had a whinge to Kia Australia, they got back to me very quickly and said I can register to get my own updates without using the dealer, I'll be interested to see if they are more up to date than 2017. I'll keep you posted. Cheers.
Yeah, my 10 year old Garmin is much easier to use for sure, !

 

[ShannonC]

Sorry if this post is in the wrong area, still trying to work it out! I have a query on the GPS Aussie maps, probably been asked before but I can't find it. My MY19 Stinger maps were useless yesterday in a newish suburb , had to use Google maps, I contacted the dealer to get it updated when it goes in for its 3000km checkup, he tells me it's already got the latest update 2017??? . According to Kia map I was in the middle of a paddock hundreds of metres from civilization, but I was actually amongst hundreds of houses in Wyndham Vale Victoria . Does anyone know if its possible to get updates on the SD card from elsewhere?

There's a thread on map updates here Navigation Maps and Map version numbers
@AV8R can kindly move these posts to the correct area.

 

[smillie]

Is anyone able to post a photo looking at the rear of a stinger fitted with Kia's bi-modal exhaust at the exhaust pipe level?
Think I read that when the dealer fits the new exhaust the diffuser at the back doesn't go back on, just wondering if someone can verify?

 

[eflyguy]

Is anyone able to post a photo looking at the rear of a stinger fitted with Kia's bi-modal exhaust at the exhaust pipe level?
Think I read that when the dealer fits the new exhaust the diffuser at the back doesn't go back on, just wondering if someone can verify?

There are at least two videos showing it, on multiple vehicles, on the first page of this thread - it does not change the rear of the vehicle in any way.

The visible outlets on the stinger are decorative only. the exhausts - stock or aftermarket - simply feed into those.

 

[ShannonC]

Here

 

[smillie]

Thanks for the feedback guys, much appreciated

 

[Hectic_AUS]

I have bimodal. Is there a way to disable it in the menu or other?
Just curious ...

 

[ShannonC]

I have bimodal. Is there a way to disable it in the menu or other?
Just curious ...

Not that I am aware of.

 

[basysmith]

I have bimodal. Is there a way to disable it in the menu or other?
Just curious ...

Simply pull the fuse tap from the driver's side fuse panel to disable the bimodal function.

 

[Stumpeter]

Unplugged mine from the actuators, default mode is apparently "quiet ". I was hoping it would be the opposite.

 

[basysmith]

You disconnected the plugs at the exhaust end where the valves are?

 

[Coast GT]

Might be a stupid question but can any of you explain why you would fork out $2600 on the bi-modal and then want to disconnect it? I don’t have it, I’ve thought about it, but I’m curious why you’d want to disconnect it.

 

[AV8R]

Might be a stupid question but can any of you explain why you would fork out $2600 on the bi-modal and then want to disconnect it? I don’t have it, I’ve thought about it, but I’m curious why you’d want to disconnect it.

Cause its there and they like modding?