Quick DV question
Turbo Mini Forums

Am I right in saying that if you sit there revving the car not moving, that the dump valve does not operate? Does the engine need to be under load for the DV to work or have I just got a duffer. What sort of pressure is required to move the diaphragm in the DV?

Car is not roadworthy at the moment so can't blatt it up the road to check.

Cheers
Rich

if you give it a hellishly good boot it may go if if your running enough boost

but it sounds fine, havea feel to see if its sucking in any air on idle, as hey do that

It's does take a lot of welly to get it to dump without load.

In the 13's at last!.. Just

Ok cheers, i'll try the lead foot option then!

Just a thought then, if the turbo is still spinning up as normal but car is not moving how/where does the boost escape to if the DV is not operating?

The turbo will not be spinning up 'as normal' without load.

In the 13's at last!.. Just

As above ^^, but why not prove it to yourself. Take a pipe of between the compressor and the plenum. The give the engine a hand full of revs and while doing this put you hand over the pipe from the compressor. You will (should) feel air pumping out, but not much.

Then think about that small amount of pressure coming out of the dump valve, it just won't make much noise.

Ben

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Handbrake on assuming it works properly, select 1st, plenty of revs, slip clutch to load engine up, you will see boost then without moving. Won't do your clutch much good though so don't make a habit of it.

^^^ as tom says....

Moz

where have you plumbed the vac in to? If you've done it before the butterfly you won't see vac and it won't open. Hope that makes sense, i'm tired.