I have a turbo smart DV on my scooby and it has an adjustment on the nipple where the small hose from the inlet manifold goes. It says hard / soft. Now I assume that it controls how the DV opens and closes, but what does hard or soft actually mean? does hard mean it opens/closes quickly an soft is vice versa? Does it just change the sound or is it better to set to hard or soft - oooo errr missus

I have also noticed a distinct change in the sound of the DV since fitting a FMIC. The DV on the original setup was between the turbo and IC whereas it is now between the IC and inlet.

Please don't reply with a "fit the original" cos I haven't got the original and even if I did it wouldn't be going back on ever...

 

which valve is it? theres a few turbosmarts for the scoobys...

 

Hard tensions the spring more, so will be a more a definite, snappy on/off transition when shutting the throttle plate.

Soft does the opposite, so the valve won't give such an 'aggressive' feel. I think you normally adjust it by starting from max hardness... then make a small change and going for a drive... another small change and go for a drive... etc, etc. The perfect position is a setting as close to hard as possible, but which doesn't induce jerkiness to on/off throttle transitions, and general driving unpleasantries....... if you can!

 

It was on the car when I bought it but I believe it is a dual port DV - it has two trumpets on it. It has no mounting bracket and does not attach to anything, its only connecetd to the car by the main hose from the IC pipework and the small hose from the inlet. I have secured it with a couple of tie wraps so it cant move.

 

Yeah that's how all non-recirc BOVs fit - a connection before or after the IC to its big 'input' port, and the top nipple to the inlet manifold for its 'control'. Also, make sure your turbo intake hose's recirc port is suitably blanked off and airtight with a suitable dia. bung or bolt and some cable ties.

But if there's no bracketry to stop the DV from actually dangling or flopping about, then make sure it's affixed to something to stop it doing that - which it would seem you've addressed.

 

OK thanks, I'll have a little play with the settings and see what difference it makes.

 

When you say it has 2 trumpets on it sounds like the mega sonic which is the loudest dumpvalve turbosmart make.The other dv that has two ports is a recirc/bov,but this only has 1 trumpet & and a pipe for your inlet return. When you fit this you want to start off with the' softest 'setting and adjust it so that it opens when you lift off ,and idles perfectly when at a standstill. That way when the spring does start to weaken eventually or you up the boost you can move it gradually more to the harder setting.