Hello everybody.

I have the bravo t-jet 120 and i want to get the "chuuff" turbo sound while changing gear without any further troubles.

Anybody tried this? Did anybody installed external wastegate or tried anything else? Where is located factory's wastegate?

Think what you mean is a dump valve.
It releases manifold pressure to reduce turbo stall.

Yes exactly!

But if i install one i think there will be problem with maf calculation and ecu will give wrong amounts of gasoline to the engine.

I am not sure,that's why i ask if anybody tried this.

Forge make a dumpvalve for the Tjet 150 with the needed sensors.

However you could also do a Cone Filter mod for a similar sound. Many people have come up to me saying my dumpvalve sounds cool, when it's just my Cone Filter that makes the sound when I come off throttle

Do you mean cone filter for the air intake?
Could you post me some photos?

There is a stock dump valve on the T-jet. you normally do not hear it because it recirculates the released air to just before the turbo. With a sport filter you might get the slightest ideea it's there.

T-jet does not use a MAF, so that air is not being measured. No problem doing the mod below:
You can get the blow off sound without any problems just by unplugging the hose from the stock dump valve.
You should plug that hose with something (a water/soda bottle cap like this works great; try a black one for more stealth)

Some people put a filter on the valve.. it's not needed and also muffles the sound. The air is only coming out and it has been already filtered by the air filter.

I've got the dump valve like that for a few years now. no codes.. nothing.

Thank you aurick. I was thinking exactly the same, but i was little bit afraid of trying.

We do not have maf but i was afraid of map sensor.

So if it works ok yours i will try that too.

Do i unplug the hose between the dump valve and air intake?


You mean that i suppose

Thank you

Yes, there's a 90dregree hose from the dump valve to the engine cover, just where that filter is in the video.
What the guy in the video did is a bit stupid the filters the air coming out of the intake... but the turbo can still pull dirty, hot air through the pipe integrated in the engine cover. Make sure you block that off.

Take one end of the hose off the dump valve and stick a bottle cap in the hose, zip-tie it.
You might have to rotate the hose a bit, from where it's on the engine cover just so it goes right next to the dump valve.

It's a 2 minute job.

Must try this

Aurick86, have you done this? Would you happen to have some closer up images of it by any chance? They'd be real handy. In my case the turbo sits in front of the engine (2.0 multijet on a Sedici) and just wanted to make sure I'm working with the right lines

This is what it looks like for me:



Is it the thicker black line going to the intake side of the Turbo?

That line seems to have a permanent flow of exhaust gas. Is that the one? I was expecting flow only when the valve would open...

diesels do not use blow off valves...as far as i know.

I think you can install one... but not sure how.. any way it's more complicated.

aurick86 said:

diesels do not use blow off valves...as far as i know.

I think you can install one... but not sure how.. any way it's more complicated.

Click to expand...

Correct, It is way more complicated, and not worth bothering on a diesel. And it'll sound like a bus.

As far as I know all modern turbo's (dont know of any exception but am open to your comments) need to release pressure and have some device to do it. A dump valve or waste gate is normally built into the turbo itself (in most cases this is true to save costs but there are exceptions) which is activated by that round thing you see there on top of the turbo. That's the actuator.

As with a blow off valve the released air gets recirculated.

With the window down its currently audible (and no it doesn't sound like a bus - although there are some pretty cool sounding buses around here ehehehe) but I was just wondering about making it a bit louder by venting it to atmosphere.

My question was:

1) is it the thicker tube with the 90 degree elbow joint, connected to the front of the turbo in my photo that was mentioned here before?

2) if so, is it normal that there is a flow through that tube even with the waste gate supposedly closed?

By the way, not sure of theres any real backing for this (maybe cooler air?) but when unplugged (and the intake hole sealed) the car actually felt more responsive during that brief run where I tried it out. Any ideas?

Normal turbos, do have a waste gate... that is different from a blow off (this is the thing that makes the turbo noise) Variable geometry turbos do not require a waste gate.

OEM turbos use internal waste gate... that does not release turbo pressure, but exhaust gases, redirecting the gasses and preventing them to turn the turbo to make boost.
I am also pretty sure that if you have the 2.0 diesel or the 1.9 150 hp the turbo on those is a variable geometry.. that turbo does not need to use a waste gate at all.

Diesels do not have a throttle valve, RPM's are regulated only through fuel timing.
That means there is no pressure increase between the turbo and the engine when releasing the throttle, as the engine is constantly consuming air.

External waste gates can be installed in 2 ways:
1. venting exhaust gases to atmosphere directly these make cool flames..smoke..sound
2. redirecting to the exhaust system somewhere downstream of the turbo.

What you show us in the picture is the oil carter vapours duct.
Nothing to do with wastegate or blow valve.

Makes sense so what should I be looking for? I just read something about a 90 degree elbow joint and that's the only one I could find