ive got a t-jet 150 bravo. how do i get the wastegate chatter. also described as "pidgeon sound". i think it sounds so much better than a b.o.v. any ideas ?

The 150 Dynamic (or whatever it is) I test drove had the distinctive wastegate chatter, but my new 150 Sport doesn't. Two things spring to mind:

1) since the Dynamic had been standing on the fourecourt for a while, wondered if it became more pronounced as some natural corrosion of the valve set in (you know how brake discs corrode on standing cars).

2) my Sport 150 seems to have a bypass valve/pipe leading back from just upstream of the electronic throttle body back to the atmospheric side of the turbo inlet. Whilst I imagine that this can help prevent turbo stall (like a dump valve) it may mean that the wastegate doens't need to work so hard.

Anyhow you're not alone !

Any other thoughts....

Steve.

Steve5665 said:

The 150 Dynamic (or whatever it is) I test drove had the distinctive wastegate chatter, but my new 150 Sport doesn't. Two things spring to mind:

1) since the Dynamic had been standing on the fourecourt for a while, wondered if it became more pronounced as some natural corrosion of the valve set in (you know how brake discs corrode on standing cars).

2) my Sport 150 seems to have a bypass valve/pipe leading back from just upstream of the electronic throttle body back to the atmospheric side of the turbo inlet. Whilst I imagine that this can help prevent turbo stall (like a dump valve) it may mean that the wastegate doens't need to work so hard.

Anyhow you're not alone !

Any other thoughts....

Steve.

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What your describing is the standard dump valve.These are whats called closed loop or recirculating dump valve and NOT atmospheric like what most people want to fit.All modern turbo cars have these as standard so the unused compressed air goes back through and not wasted meaning less boost drop basically

Only way to get true wastegate chatter is fitting external wastegate meaning new manifold,new turbo probably meaning new intercooler,re-map,induction kit,full stainless list goes on really.Probably find fitting an induction kit will make the standard chatter noise louder,i certainly hear it in my sport and its all standard still

hi you should be able to get the chatter by fitting a induction kit :O)

cheers guys, great help. i shall treat myself to an induction kit.

Ok my 120HP doesn't make the charter sound unless of course i blank off the wastegate outlet but this is incredibly damaging to the turbo making it spin in the opposite direction immediately after spinning the right way just wondering what is the difference between the 120 engine and the 150 engine is it just a bigger turbo or are the internals of the engine slightly different? e.g slightly bigger bores, different cams? any info would help alot thanks!

its just a different turbo

Any tuner will tell you wastegate 'chatter' doesn't exist.

The noise generated is due to the 'boosted' air backing-up against the closed throttle butterfly. As it backs-up it the air gets 'chopped-up' by the still-spinning compressor wheel creating the 'chatter'. The turbo does not spin backwards.

It causes damage to the turbo due to the shock-loads and thrust changes as it rapidly stalls then spins-up again, and affects ball-bearing turbo's more (running without a dump-valve of somekind will usually invalidate the warranty on aftermarket ball-bearing turbo's- not that any turbo warranty is usually worth much anyway ).

Some MiTo customer's have reported a small amount of chatter occuring intermittantly and it's nothing to worry about unless it's happening constantly (valve stuck closed/blocked). In fact even with an atmospheric valve on my car (Ford) you could drive it in a way where you could get both 'chatter' AND a 'pssstt'.

Personally I found the atmos. valve a bit lame, so I removed it and now run without a dump valve. 3 Years-on the turbo's still going strong, peaking @ 20psi and 'chattering' like a good-un! :slayer:

ok you removed the dumpvalve is this on your ford or a bravo? plus does anybody know the part number for the 150 T-jet turbo?

craggit said:

ok you removed the dumpvalve is this on your ford or a bravo? plus does anybody know the part number for the 150 T-jet turbo?

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My Ford.

Removing the Bravo's electronically controlled valve would likely result in the EOBD lamp coming on and the ECU may even switch to limp-mode to protect the turbo. Blanking it off may also cause a fault to appear as (if I remember rightly) there is an air pressure sensor before and after the recirc-valve, probably to monitor it's operation and ensure it's working.

i unplugged the dump valves electronic control plug and it flagged the EML but has not put it into limp mode.

ok here we go 2 videos of my bravo 120 chattering one video on side of the car the other on the other side!



[nomedia]http://www.youtube.com/watch?v=TefKhVZgIm8[/nomedia]

Nice chatter m8 but it looks to me that you've just pulled the hose off that goes from intercooler charge pipe to re-circulating pipe that runs round engine cover and back to turbo inlet,is that correct? I unclipped the plug that the said pipe attatches to but no extra noise at all aswell as no lights showing up etc

Could be worse could have a Duck stuck in your turbo

Well what ive done i disconnected the pipe to make the normal dump louder but i actually unplugged the clip off the back of the dump valve which tells the wastegate to dump

craggit said:

Well what ive done i disconnected the pipe to make the normal dump louder but i actually unplugged the clip off the back of the dump valve which tells the wastegate to dump

Click to expand...

So basically you disconnected the recirc-valve solenoid (therefore making it stay closed). The wastegate is on the turbo, not up by the throttle-body.

You really need to blank-off what's left of the recirc-pipework as you're drawing-in dirty air into the turbo compressor vanes. You'd be surprised at the damage caused by a miniscule dirt particle hitting the vanes at 100,000rpm.

Yes ok mate fair point well made ive put another filter on the air induction pipe when that re-circ line joins it put a little piper X crankcase breather on it ... fits perfect

did this affect the performance or flash up any warning lights. i bloody hope it was safe to do.sounds pretty sweeet.

It has put up the engine management light, but that's just to say something is disconnected under the bonnet, it has not affected the performance what so ever.

Any chance of some pics of exactly what you have disconnected etc all wiring plugs,pipes etc as i love the sound yours has made but cant figure out exactly what needs done!

Cheers