I just watched this video on youtube and this trucks sounds awesome. It says it has a boost stick and a egr blocker, but i dont know wat either of them are supposed to do. And it has a 4inch straight pipe. Is it turbo bark? I have heard a cummins turbo bark but not a dmax and that sounds nothing like a cummins bark. Also what is some mods you can do to make it whistle louder and sound sort of like that truck ,but not ruin the turbo? Thanks guys.
http://www.youtube.com/watch?v=Nt-6uPdd0F4

Straight pipe exhaust is what's making it sound like that. The sound on let off is compressor surge. It is not good for the turbo. It happens more frequently and intense when the motor is cold. Notice how he started up and took off without warming it up.

Remind me to never buy that truck.....

no kiddin.Alii not even warm yet and he's jumpin on it

What a moron, snow on ground, cold motor and romping on it... Keep in mind that if you make your truck sound like that, someone may mistake you for this guy!

What a moron, snow on ground, cold motor and romping on it... Keep in mind that if you make your truck sound like that, someone may mistake you for this guy!


LOL!

He's got a relief or "blow off" valve installed to relieve the back pressure, that's the sound you hear.


Sounds like compressor surge to me, but maybe.

I thought Blow Off Valves didnt work, arent needed on diesels. No butterfly valve or something. Cant recall what I read.....

I thought Blow Off Valves didnt work, arent needed on diesels. No butterfly valve or something. Cant recall what I read.....


Variable Vane Turbos do not use Blow off valves. LLYs and newer are VVTs.

That sound is not turbo bark. I have the same set up and it is in the exhaust. it just the turbo slowing down. turbo bark is when you are really in it and you let out of the throttle fast which takes the exhaust drive pressure away from the turbo while its building boost still and the boost pressure is actually surging back out of the turbo rapidly. you can also see this with your boost gauge. when mine does it it jumps up and down 3 or 4 times and you will hear a woof woof woof woof from under the hood. the sound this video has is from when the trans make a shift it defuels the engine causing the turbo to not have exhaust drive pressure momentarily or when he is letting off the throttle fast and taking the drive pressure away as well.

My truck sounds just like that i love it. And the few very rare times i did half to drive my truck cold i never took it above 1500 rpm for the first few blocks. Rompin on it cold like that sure isent good for the eingine.

haha

So is it ok, or not? I assume it isnt b/c i have never heard oen like that before.

Its not good.

That video reminded me of the intro to "Police Squad". Remember, with the bubblegum light flashing. I was hoping he'd hit those pedestrians.

That sound is not turbo bark. I have the same set up and it is in the exhaust. it just the turbo slowing down. turbo bark is when you are really in it and you let out of the throttle fast which takes the exhaust drive pressure away from the turbo while its building boost still and the boost pressure is actually surging back out of the turbo rapidly. you can also see this with your boost gauge. when mine does it it jumps up and down 3 or 4 times and you will hear a woof woof woof woof from under the hood. the sound this video has is from when the trans make a shift it defuels the engine causing the turbo to not have exhaust drive pressure momentarily or when he is letting off the throttle fast and taking the drive pressure away as well.

Same here. Turbo bark is not good but that sound in the vid I do not think is turbo bark either. I hear mine bark sometime while up on the dunes...usually when I hit the brakes quickly once I get to the top of a hill.

This is what turbo bark sounds like- http://www.youtube.com/watch?v=z3bQRs9W4V4


The sound in the other video is not bad. The way he's driving it cold however is. How would straight exhaust making that noise be bad for it? The stock system just muffles it. Mufflers and cats are actually not that good for diesels from what I've heard.

Well i know what turbo bark sounds like on a cummins, but wasnt to forsure what the sound on a dmax is. I plan on cutting off the exhaust and cat anyways, so we will see if it makes that noise or not.

Well i know what turbo bark sounds like on a cummins, but wasnt to forsure what the sound on a dmax is. I plan on cutting off the exhaust and cat anyways, so we will see if it makes that noise or not.

Yeah, pretty much sounds the same.

Cool. Thanks for the help.

it is definatly not good for the turbo to make that sound. from what im told the turbo tryn to spin the other way and thats y they make that noise.

Turbo "bark" is a worse condition than "compressor surge." In a compressor surge situation the air from the turbo charger has no where to go (no BOV) so it recycles back through the turbo. The video of the dodge demonstrates that pretty clearly. At least with the surge the turbo is intermittantly forced to change speed.

Turbo "bark" is an exaggerated version of the compressor surge where the turbine stops spinning from so much backpressure or can often spin the opposite direction. Racing Tuner cars often end up with compressor surge even when equipped with a BOV (which is why apexi invented the dual stage BOV and HKS invented the SSQV pull type BOV to allow air to escape in multiple levels of boosting situations). So you don't really ever want your truck to sound like the video posted.

It's all fun and games until turbo blades end up in the intake manifold.

in the duramax video... all VVT duramaxes do it. its just muffled from the factory by the cat, muffler and turbo resentator (black plastic on top of engine says 6.6 turbo diesel) sometimes i heard it in the mountians with my 05 lly when it was stock
-and then when i put a 4 inch turbo back no cat just a muffler now i can hear it almost everytime i drive. it happens when the turbo is spooling up and then you let off the throttle all it is, is the air escaping, it will happen at high elevation a lot more. it happens to your stock truck too, its just muffled. it usually happens when your merging on the freeway and the idiot in front of you slams the brakes and you do to or chop the throttle like the video.

ive done the same thing as the video of the dodge and it is NOT the same sound it makes that sound about twice as loud and thumps too.

by the way it will do it when it gets hot too if you are in a higher evevation than normal

mine does it also and i know its not turbo bark and whos to say his truck wasnt warm in the video he could of been driving it before he made video. if you listen when he starts it it does not sound cold to me. way more clatter when its cold maybe not all the way warm but not enough to wreck it.

So i see theres alot of mixed opinions in regards to this noise. To my under standing that barking type sound is normal or the wastegate opening ?? theres a guy with a psd who lives one my street with exhaust and a programer and when he romps on it is dose the same thing. On that cummings ram that sure sounds like compressor surge which is a no no . But how dose compressor surge happen when there is no butter fly to sunddenly snap closed ? no matter what a diesel still eats the air no ??

Well bark is trying to backspin the turbo, so in that case it wouldnt be eating air. I emailed the guy. He said it will do it with or without the chip. He removed the pipe,muffler,cat,resonator, and got that sound. He said only certain models are that loud and from what i have been seeing it happens alo ton 05's. So apparently it is ok.

Wow! There are a lot of guys on here that THINK they know a lot. Let me shine some light on this, I have some first hand experience.

That is MY video of ME driving MY truck about two years ago. Someone on this board asked to hear what my truck sounded like so I made this video.

The truck WAS WARMED UP, I'm not that dumb. I had just gotten back from 30 mile drive from Cedar Rapids, IA to Iowa City, IA. The truck was shut down for maybe 10 minutes while I got my camera ready.

The sound you hear is the turbo whistling and then spooling down when I let off the gas, it is NOT the woot, woot sound that is hard on the turbo. The other video posted demonstrates that bad woot woot sound you don't want very well. All I'm doing in that video is getting on it and letting off, sometimes with 5 lbs of boost, sometimes with 15-20.

My truck has 159k miles on it with no problems, so I must be treating it just fine :rolleyes:

To the OP, the mods on my truck are in my signature. I don't think I had the boost stick at that time. The main things that cause the sound are the 4" straight pipe, blocking the resonator, and the CAI, in that order.

BTW, when I made the video I used a lavalier mic and mounted it outside my truck just behind where the exhaust exits. The truck is actually very quiet with the windows up.

The boost stick was is in your description i think. But thanks for clarifying everything again.

He's MADD I say MADD!:frankenst

Moved to Fuel System, Air, Exhaust, & Emissions Upgrades...

premis the truck sounds sweet cause mine sounds the same way keep on rippen.

So is there any way to get rid of the turbo bark on a VGT like by a BOV? My buddies 6.4 powerstroke does that almost every time he lets off the gas.:eek:

My truck does the same thing and I did the same mods as the truck in the video. When I blocked the resonator is when it got louder but it is not that loud. I just hope it doesnt hurt the turbo in anyway if Anyone else knows please let me know.

Well I see one thing nobody noticed about the first video. If you notice when the truck is started and you hear the vanes reset that is a sure sign that the truck is atleast warm if not at optimum temp. The only time you hear the vanes reset is during a warm start up which is usually at 180 deg or higher engine coolant temp.