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hi, is it possible to fit a dump valve to a 1.9 jtd multijet engine? If so would it be mounted on the pipe from the intercooler to the engine and where would the vacuum be picked up from. many thanks A and V (new alfa owners!)
 

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Don't think it can be done, there is no throttle on the JTDm so no way for the pressure to build up in that pipe when you take your foot off the accelerator. In a petrol, the throttle closes but the turbo is still winding down, so the dump valves releases the pressure. This isn't an issue in the JTD as the air just carries on being sucked into the engine and back out through the exhaust.

You wouldn't get so much of a hiss, just a wheeze as the pressure quickly drops.
 
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