Dump Valve - Adjustable ?

I have one simple question.
I saw many dump valves out there and I am looking to buy one. Many of them are adjustable.
What do you actually adjust on the adjustable ones ?

Spend your money on a good dump valve, adjustable ones aren't worth bothering with.

All your adjusting is the preload on the spring so once its set at the right preload you wont touch it again.
A Forge or Bailey valve will last for years and give good results straight from the box.

So you say I should go for a non adjustable one ?

Yes

You mentioned a forge or baileys earlier, is the forge not adjustable though as you can change the springs?

Ive got a forge DV004 on its way in the post, cant wait! Im sure the novelty will wear off after a week or two though.

Hmm , this guy here is selling a Forge Twin piston :
http://cgi.ebay.co.uk/Forge-Diaphragm-du...1QQcmdZViewItem

But he says is not working for cars with Air flow meter...
Will it fit to Coupe ?

Cars with MAF sensor should not use atmospheric valves IMO, as you are letting measured air out of the system. Perhaps not enough to do any major harm, but I'll stick with my recirc valve. If you want an atmospheric valve, atleast get a twin piston one.
On MAP equiped cars it doesn't really matter.

Coupe has MAP or MAF ?

Depends on the coupe, the 16v has MAP, the 20v have MAF (or AFM as we know it)

16v and 16vt = MAP

20vt = MAF

Unsure on 20v

I have a 20VT .. so I guess a DV26 will do just fine.

If you want a adjustable one then go for the HKS, I have one and my mate. Not intstalled yet but my mate has.
I can tell you there is no mutch difference when you adjust it.
It is not cheap this one.
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Silver