Alan MaC

After asking questions on SN about the above and, both points of view on this subject are miles apart, I decided to take the plunge.

Got an atmospheric Bailey Dump valve fitted today with 1 extra little mod>>>>>>>>>>>>

In the Tubing, there is a little valve fitted about about an inch inside the hose.( the thin hose)

This was taken out ( I noticed it had a large hole in the centre) and an STI one replaced it. ( The hole in the middle of the valve is very much smaller).

This forces through more pressure as the hole is smaller. The difference is very noticable. Much more responsive low down and much smoother and quicker!

I do agree about the whoosh and, it is a pain, and I have had a few looks from puzzled pedestrians but, the exhaust burble drowns it out a bit.

Very pleased and for me, it has made a difference.

Hope this helps in the great debate about Dump Valves. Everyone is entitled to their opinion which I respect.

Happy Motoring while we still can.

Alan MaC

v5 man

iTrader: (4)

Where was the pipe which had the small valve? Was it connected to the turbo?

Alan MaC

Yes, if you are looking at your Turbo, on the left hand side, it goes underneath.

The easy way is to feel the little hoses and the one with the lump is the one I'm on about.

Hope this helps.

Alan MaC

V5 Man,

Been told it's in the wastegate pipe to the booster port selonide and it's called a pill restrictor.

Defintintely goes better with the STI one fitted!


Alan MaC

Fuzz

If you have changed what I think you've changed then you should be careful.
The pill restrictor has ABSOLUTELY nothing to do with the dump valve.
It is there to control flow to the wastegate actuator.
Putting a smaller one in will restrict boost pressure from getting to the wastegate and opening it, therefore it will stay shut and your boost will be higher and less controlled.
Not really surprised it goes better.....


Andy

v5 man

iTrader: (4)

Exactly as Fuzz says and the reason I asked the question.

If you add a smaller restrictor you`ll boost higher. Without increasing the fueling to match the extra boost you`ll detonate till it goes bang. Very dangerous game IMO

Alan MaC

You think I should increase the fuelling?

How is that done?


Thanks.

Alan MaC

scooby_matt

Re-map.
Or, save yourself a few quid and put the original restictor back in.
I remember this being changed when my car was being remapped to get the desired boost, so you need to be careful

Alan MaC

Nice one.

RE map it is then.


Thanks

KInd regards

Alan

andythejock01wrx

If I changed back from the Baileys my car had when I bought it, would I need to remap (it was mapped by Andy F 4 months ago) ??

Alan MaC

Andy,

Why are you thinking of changing back?

andythejock01wrx

~ To get rid of the noise. Never driven a Scoob with the std recirc DV though

Alan MaC

I have had the SRCDV from new.

As I said apart from the whoosh, very pleased with the increase in responsivness etc.

The extra thing I had changed at the same time was, fitting the STI tablet valve.

IMHO better than the recirculating one. I know I've only had the job done 3 days, think it's better with the ADV.

Kind regards


Alan MaC

andythejock01wrx

Thanks for your thoughts Alan.

I can remember years ago hearing that Freddie Mercury would have liked to have had his protruding teeth fixed and asked the dentists whether it would effect his singing. They said they didn't know, so he didn't go ahead with it.

That's pretty much how I feel with regard to removing the dump valve !
Would consider going back to std but don't fancy a loss of responsiveness.

RB5_245

Will make no difference to feel, and you don't need a remap for the dump valve.

This thread has become confused by 2 very different things.

changing the restrictor (pill valve) affects your boost control, and requires it to be checked/sorted out.

Do whatever you like with your dump valves. Std will be fine, no loss of response.

Dave

Tripple'O G

as above......
2 completely dif issues....

the "valve" you're talking about does infact affect boost....I had my one replaced on the remap and smaller is better...wayhey

EddScott

I'm not convinced that a VTA increases responsiveness. I think the feeling you get between the two is down to power delivery.

I thought mine felt slower once I put the re-circ back on but I think its due to the fueling being correct again. As theres no initial thump (ala VTA) when you floor it it feels slower but after a week with a re-circ I'm starting to think its still as fast it just does it alot smoother.

Alan MaC

Thanks all for your advice.

Booking it in for a Remap next wek.

Thanks again all.

KInd regards

Alan MaC

Alan MaC

Had the remap today and it goes great.

You were all correct, thanks for the advice!!


Kind regards


Alan MaC

bob r

iTrader: (46)

Nice one. Who did the map?

Alan MaC

It was powerstation.

Top people!


Alan MaC