Turbo

Honest John Back Room » Technical matters
View Threaded
Mon 29 Jul 2002 09:16
Turbo - CM
I know that this should be in the technical section but as the car is in for a service tomorrow I thought I would get mor replies here!

I am not sure if I have a problem or not and any views would be gratefully received.

My turbo (diesel) seems to sometimes loose bost pressure. It whistles away quite happily and then at about 2500rpm you feel a flat spot and the whistling stops and sounds like there is a release of gases. Sometimes this escape is preceeded by the turbo "whistle" being a bit stuttery. Conversely there sometimes seems to be a power surge at 3500 rpm.

I am just wondering whether it is my non-mechanical mind playing tricks or does someone out there know better
Reply | Report as offensive | Link
Mon 29 Jul 2002 14:52
Turbo - dan
Hi CM,
Does your car have an ECU controlled bleed valve? These can play silly b*****s sometimes. (Avoided with a bypass and manual bleed)
If you're overboosting from a sticky wastegate or other regulating component your ECU may be hitting safety shut-off (stutter) or this flat spot/stutter is comng from the turbo rubbing on the housing from an eccentric spool up and causing friction at certain spin's (Friction equals powerloss)
dan
Reply | Report as offensive | Link
Mon 29 Jul 2002 15:07
Turbo - CM
far too technical for me! although it does have an ECU controlled bleed valve.

thanks anyway
Reply | Report as offensive | Link
Wed 31 Jul 2002 09:55
Turbo - CM
Dan,

Problem sorted. There was a split pipe which I believe was the vacuum one.

Thanks for your advice.

Charlie
Reply | Report as offensive | Link