Vehicle & Technical > Discovery
stupid question time
littlepow:
My Cupra had a re-circulating dump valve, removed all lag, as when you lifted off the throttle to change gear. The unwanted boost from the turbo was fed back in to the start of the turbo, keeping it spooled up nicely. So no whooshing noise just constant turbo boost during shifting.
Reaper:
--- Quote ---what difference does the fitting of the dump valve to a tdi make?
--- End quote ---
As the daughter of a friend of mine said "it makes it sounds like a bus" which about sums it up!! :lol:
Topple:
when I got the gauge out of the box it read 0
by the time I had finished plumping it in and taking it for a spin its reading .75bar even with the engine off.
On the run it fluctuated between .75 and 1 bar
how do I zeroise it ?
Porny:
Hrmm interesting....
Sounds bug***d to me :wink: :wink:
Although to be slightly more helpful...
Four choices:
One phone up the importers (can't remember their name off the top of my head)... ask for a new a one because yours is faulty. To which they will happily oblige (well they did in my case - mine was way out - and the bloke didn't have a leg to stand on when I told him how I tested it!!!)
Second choice... the place you bought it from (off Eblag) phone them and tell them it's faulty and you want a replacement!!!
Third choice...
Adjustment :twisted:
The needle, with the engine off should sit between the green and yellow lines (see pic)... if it doesn't you 'can' use a flat blade screw driver to 'adjust' the internal mechanism slightly... put the screw driver through the hole where the bulb goes, and move it fractionally until the needle is in the desired place.
Fourth option... send me a pm I may be able to get you and exchange boost gauge!!!
Other than that....
At the moment you're only getting 0.25bar of boost which seems pretty low!!!
Just check you haven't got any leaks anywhere. Esp. check the 'T' piece my original one cracked (can get you a better replacement for a few pence if needed)
Ian
Topple:
Took it out the dash yesterday and the needle went back to 0 (as your pic) . adjusted the turbo, didn't screw it in all the way, now on full power the gauge reads just under 1 bar.
I had a thought though and talking to others. If the engine is run with increased fuel flow and turbo boost what effect can that have on temperature and the effect of that.
I've adjusted the smoke screw by about 90 degrees, the diaphragm by about 90 degress and the star wheel by 90 degrees. and the turbo by approx .2 bar.
I don't want to cook the engine whilst towing a great big caravan.
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