Jamesmulhearn

Hi there on my escort rs s2 when cruising in high gears say 4 or 5 at low revs when I go to accelerate a strange scratching hissing noise starts but if I accelerate harder ans spool the turbo up it stops.it sounds like the turbo fins are touching the casing but I know that's very unlikely...any ideas?? It has a bailey dv26 dump valve but doesn't sound like its coming from that...thanks

RSmark84

strange scratching......?

Anyway the 'hissing' would be the vacuum. That's perfectly fine, the noise will stop as you are putting positive vacuum as the turbo is boosting, negative vacuum (ie) normal driving before building up boost.

Jamesmulhearn

Its an on and off hiss in quick succession almost like a scratching :s i hope its juste being paranoid! Thanks anyway

Red_bull

Turbo is easy to check mate, just get your boost pipe off and have a look.

mgtkr1

boost leak?

AstoN_B

iTrader: (1)

Could be surge too, what kind of revs and boost/vacuum are we seeing?

escortmk3rwd

need to hear it to be honest

mentalasanything

Do you have an in-car bleed valve? Mine used to hiss as it bled off to atmosphere behind the dash.

Lee

escortmk3rwd

if it was turbo bearings it would throw smoke out and feel no boost

NIMRODS_RST

iTrader: (6)

i had this on my old RS, it turned out to be the turbo elbow bolts came loose check them ;0)