gcfcos

Hi guys. Fitted stage 3 bits to my 4x4 saph and wound the boost up to required settings via actuator rod, once I got past 20 psi my turbo developed a screeching sound on full throttle/boost. It never did this before on stage one 16psi. There's no play in the shaft and no oil leaking out. Appreciate anyone's suggestions. My thoughts are the turbos poss shagged lol! Thanks, Gary.

ben_frst

i would say its boost leak or the waste gate pushing open

escortmk3rwd

boost leak

gcfcos

I thought boost leak myself but its hitting 26psi dropping and holding 24psi as its supposed too and it boosts hard and still gives its kick.

Cameron

I had this noise on my rst, the turbo was unbolting itself from the exhaust manifold

gcfcos

Cool ill have a look at that. Thanks very much for your reply

wedge07

Mine was doing it but turned out to be dump valve sticking open.

gcfcos

Yeah I had that problem with the dump valve years ago but the holes been blanked off for years now :-( gives a nice chatter though lol!

wedge07

I want to blank mine off but will it damage the turbo and also does it boost better or worse?

gcfcos

I was told by my mate who works at a turbo specialists that blanking off on a t series turbo won't do it any harm. Mines been blanked off for about 5 years now and the turbos still going strong that chatter is rather addictive and sounds 1000 times better than a Chav valve to be honest I didn't notice any difference between boost/power before and after blanking it off

wedge07

Ok brill I wanted to hear that I'm bored of the DV now and I like chatter my dv has started playing up again so ill be getting rid lol. Might solve the high pitch screech lol

gcfcos

As long as u have a cone air filter u should get the chatter with the dump valve blanked off