Vehicle & Technical > Discovery
stupid question time
Porny:
--- Quote ---what difference does the fitting of the dump valve to a tdi make?
--- End quote ---
It goes whoosh.... :wink: When you lift off the accelerator
So you have clatter, clatter, whoosh, clatter, clatter - not just clatter, clatter, clatter, clatter :wink: :wink:
Ian
davidlandy:
--- Quote from: "Porny" ---
--- Quote ---what difference does the fitting of the dump valve to a tdi make?
--- End quote ---
It goes whoosh.... :wink: When you lift off the accelerator
So you have clatter, clatter, whoosh, clatter, clatter - not just clatter, clatter, clatter, clatter :wink: :wink:
Ian
--- End quote ---
so nothing other than the whoooossshhh then?
Topple:
--- Quote from: "Porny" ---Ignore the instructions in the box....
The best place (as recommended by Land Rover) is here (see pic)
--- Quote ---...but you want to get it a close to the plenum as possible to get the most accurate reading
--- End quote ---
Do you have a plenum on a diesel??? Intake manifold is the usual term.
It's only worth taking it from the inlet manifold if the actuator control is also taken from there.... which it is not as standard.
Just T into the pipe from the turbo compressor housing to the actuator (which in turn has a T to the injector pump)...
A word of warning.... the T piece supplied with TIM gauges are very easy to break!!!!
Ian
--- End quote ---
Thanks Ian,
thats where I was going to put it but just wanted to make sure. It took the guy on ebaythe best part of a week to send it to me.
Do you think it's worth calibrating before I fit it, I know we discussed it earlier, if so I can get it over to you first.
P
Landy90IOM:
am I right in thinking that diesel dump valves are actually operated with a electronic solenoid? as they dont have the throttle plate that petrols have? So where as a petrol dump valve would decrease turbo lag, aswell as the whoosh, diesels just have the whoosh
TimM:
I used to have a Dump-valve on my Escort RS Turbo (sits back and awaits abuse!), the idea was that if the throttle was closed (during a gear change) the backpressure from the boost going nowhere would stall the turbo, and then it would have to startup again before it could give any boost.
The Dump valve allowed the excess pressure to vent off and allowed the Turbo to keep spinning during a gear change and so as soon as you put your foot down your would be on full boost straight away, this didn't increase the maximum power (so my insureres didn't load the policy) but allowed it to stay at it's upper limits more - the car became faster and much more drivable, and it also prolongs the life of your turbo.
BUT.
I've always heard that these don't work the same on Diesel's and so have not fitted one.
I'd love them to be wrong, if I could do do my 300TDi lump what I did so many years ago to my Escort I would be very happy.
:D
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