ClassicWR1

iTrader: (3)

Just wondering - at the moment i get a really cool sound from my engine as i take my foot off the accelerator, which im led to believe is wastegate chatter??....

now if i were to change my dump valve or perhaps renew my induction kit - would i risk losing said noise???? Or will it stay there whatever???


any help or knowledge v much appreciated...


thanks guys!

tathan

it's not wastegate chatter

it's probably compressor stall (the throttle closes and there's nowhere for the air to go and it stalls over the turbine making that noise, and probably knocking **** out of your turbo), or maybe you can just hear the recirculator.

Saint AAI

As stated, there is no such thing as wastegate chatter. If it sounds like a VTA dump valve, but kind of chopped up, then it is compressor surge. What dump valve do you have?

ClassicWR1

iTrader: (3)

oh i see!!!... i saw a thread a while back saying thats what it was, kinda like the rally cars that have em sometimes??

The sound is like.... LoL. can you remember the bionic man when they do something bionic ha ha - kinda like that!!

the dumpvalve on there atm is just the baileys 1 i believe... thats why i wanted to upgrade to something louder (HKS, blitz, etc etc?).

So am i right in thinking this is not good???....

burbling1

iTrader: (1)

If you were to remove the dumpvalve it would increase the sound fitting a induction kit would do the same. Removing the dumpvalve is likely to decrease your turbos lifespan.

RomfordWRX

iTrader: (1)

i had a sound similar to that on an old Forge dump valve, turns out the diaphram inside and a tear, hence the repeated hiss/fart sound. I changed to a HKS and solved the issue

Scooby_CL

iTrader: (2)

Personally never had issues with comp stall ran one of my turbo cars with no dump valve for over a year with absolutely no sign of excess bearing wear or shaft play. think its all a bit of a myth personally, i know what happens and how the air is effected but just dont think its all 'that' bad.

didn't do it on my last car as that had ceramic comp blades and that would have killed the turbo lol

will probably run a closed bov or no bov on my Subaru as well as it just sounds the ****! or at least a super hard spring so it chatters on soft throttle and dumps on WOT

RA Dunk

Some turbos can handle it ok, others not so...

Scooby_CL

iTrader: (2)

Most turbo's now a days are pretty dam strong, compressor and exhaust blades are allot more durable then they used to be... but yep totally agree, all depends on the turbo hence staying as far away from comp stall as possible on my mr2 with the crappy ceramic blades.

ClassicWR1

iTrader: (3)

Right so are you saying i need to be doing something to stop this noise guys???
i think it sounds kinda cool is all.... ha

Scooby_CL

iTrader: (2)

Personally i don't think its a biggy, some might disagree though.

what turbo are you running? Td05? there fairly tuff beasts so a bit of comp stall wont do it no harm.

ClassicWR1

iTrader: (3)

yes mate, new td05 put in alongside the new engine 2years ago now i believe??

good good, thanks for everyones posts guys!! Theres just so much im interested to learn and know about when it comes to the second wife (hehe)


Thank you






Andy

Terminator X

iTrader: (7)

Mine also "chatters" MD321t ...

TX.

B0DSKI

iTrader: (17)

Just what i'm hoping for when mine gets fitted. Getting rid of the dumpvalve, Mark @ Lateral say's a 321T will have no problems at all

picky77

I want mine to chatter

phil739

iTrader: (30)

my vf35 does it to , with a kn induction and turbosmart dv

ClassicWR1

iTrader: (3)

LoL, yeh it does sound cool i gotta admit!!!

just to clarify tho - so is it the actual turbo that causes it??? So that means i could change my dumpvalve or buy a new induction kit and i wouldnt risk losing the "chatter" right???...

mirrorman

iTrader: (2)

ive got a TD05, Front mount with no dump valve, the chatter is off the chain!!

I have run my last four turbo cars this way and have never had any problems. fiesta turbo with a little Garret T2,(also a side note, came out of the factory with no d/v) uk impreza TD04, R34 Skyline and now my WRX, as mentioned above, I believe it all to be all a bit of a myth about damaging your turbo.

New_scooby_04

iTrader: (4)

As above it's air stalling over the compressor baldes, not wastegate chatter. Easiest route to getting the sound is blanking off the DV. Some older VF turbos (think pre VF30) are a bit too fragile to be used sans DV. TD series are as tough as old boots and will be fine with it.

Running without a DV can generate issues with MAF reversion on MAF equipped cars which does affect drivability (you can get a judder/jerk comming off the throttle when the car is on boost) I did on my MY99 when I had an Ecute'd Std ECU. No such issues when I went Mafless with simtek though.

Ns04

ClassicWR1

iTrader: (3)

Forgive me for sounding dumb here but i have a dump valve though????...

both mirrorman and new-scooby-04 are talking about running without one are you not???

and just out of curiosity - what are the benefits of running mafless may i ask???


andy

Scooby_CL

iTrader: (2)

just to clear things up a bit for you buddy, it will be your dump valve which induces the 'chatter' from the turbo... this is only because for some reason the bov isnt releasing all the pressure from the turbo when you come off the throttle.

if you replace the dump valve you need to either get an adjustable one which you can turn to a harder setting, this means it takes a greater built up pressure to force open the bov and 'dump' the air out. or just find a way to block the hole from your tmic/fmic... so you run with no bov.

ClassicWR1

iTrader: (3)

Nice1 scooby_cl, that makes abit more sense now i think. Was wanting to change to a louder dumpvalve too (HKS, BLITZ etc) but think i will just keep the 1 i got along with my bionic man sounding car!!!haha

thanks