mk4 rs turbo cab
1.8 zetec bottom end
standard 8v head +piper cam
technics stage 3 t3
chip
intercooler
scorpion ex
filter
mfi

240bhp@16psi@fly

iya peeps, took my dumpvalve off an have little chatter on boost,how can i get it to chatter off boost?or chatter louder on boost? im guessin i need a management conversion,what would be my best option? iv read alot of topics but 2 much to take in lol, possible 2 grand budget cheeRs!

 

Chatter on boost? Isn't that surge?!

If you are willing to spend 2 grand for the sake of a noise then EFI conversion would achieve just that.

Honestly I think that efi chatter sounds pathetic as its to high pitched.
http://www.youtube.com/watch?v=Rhyfv...eature=related
http://www.youtube.com/watch?v=baUEBAKw5vQ

Videos examples are fiesta's, dont know if the turbo size would make much difference or not? hopefully someone will shed some light.

Much better sound
http://www.youtube.com/watch?v=cPZZvd55hxg
more breathy and forcefull.

 

i took the dump valve off my cossie,although i love the sound i got very annoyed with it very quickly.
i think maybe more boost causes more chatter,or surge,or turbo stall or .....!

 

Turbo size depicts the chatter noise as well as boost level and engine size, usually small turbo equals high pitch (t25, t28 etc) and bigh turbo equals a more slower low pitch chatter, t34, t4 etc. the more boost you run the higher the pitch as a rule also.

 

Chatter is Turbo stall and is bad for turbos, it puts strain on the turbo and will shorten the life of it, why would you want that??
You close the butterfly and excess boost back up and pushes its way back through the turbo THE WRONG WAY and the noise is the blades chopping the air up. Now your turbo is stalled you have lost boost?? You dont want turbo stall

 

you wont get chatter really from mfi mate

 

Here goes another debate. Surely to actually "stall" a spinning turbo you would need more pressure returning than the actually boost itself? You think how fast those blades are spinning, and the shape they are to force airflow effectivly one way. Rushing air the other way would need a hell of alot to actually stop them.
Also, Between gears, a d/v realeases all boost pressure so the turbo needs to charge the cross over again before power returns. I found My erst running 15psi has less "lag" between gears without a d/v.

The other thing, My Turbo is nearly 3 years old now, every day car, running 17psi, not even a hint of shaft play. So it cant be that bad surely?

 

You can get a nice bit of chatter on MFI. Just not really loud like EFI. Anything over 14psi iirc on mfi you can get audible chatter.

Will have to try and get some footage of my car another day. I actually prefer it to the sound of efi chatter.

 

You do realise the mk6 Fiesta is EFI too?

 

That's my old FRST

 

My cvh turbo escort on t3 sounds smart IMO

http://www.youtube.com/watch?v=T0T09...e_gdata_player

Skip a minute

 

http://www.youtube.com/watch?v=ts6_Z...eature=related

 

Yeah but, clearly not a std frst is it? sounds completely different.

I'd be hacked off if I EFI'd my erst and it sounded like them.. or this

http://www.youtube.com/watch?v=6J-mS...eature=related

Sounds fake.

 

That does sound good. What boost is that running?

 

holding around 21/22 there, spike of 24

 

Aye it's a 2.0 Duratec in the mk6 Fiesta, but all those clips you posted being efi cars shows that it's not the efi that controls the way the chatter sounds, as they all sound different.

Yeah that does sound shit, lol.

 

Probably using "EFI" as the defining feature was a mistake on my part.
Its the difference between MFI and EFI that gives you the louder chatter. However I'm not sure what makes them sound so awful lol.

 

im running efi with plenty of chatter couldn't be with out it now

 

Metal boost pipes.

 

The classic Cosworth Chatter is the king, but T3 EFi chatter sounds pretty cool 2!

MFi's dont chatter much as the airbox/associated pipework deadens the noise slightly, although that said its still audible esp when running some decent boost!

Obviously an EFi if fitted with a cone filter has no box/not much pipework to deaden the sound that comes from the turbo!

 

so how can i achieve a slightly louder chatter from my mfi rst?, obviously remove dump valve,how about removed air filter and fit something mesh over where the cone would sit on the metering unit?

fit metal boost pipes????

 

obviously i mean a sort of mesh that would stop crap gettin sucked in.
as i no the filter must dull the noise slightly aswell.
i would have thought with something like that on the metering unit and at least a bar of boost it should make it sound a bit louder????