Scoobyten

iTrader: (1)

Hi, just a quick one. I need to replace my dumpvalve as it's knackered. Any recommendations on a new one at a fair price? Nothing too special. Thanks.

Myles

iTrader: (40)

The OE recirculating one does the job, if you really want a dumper, the Forge.

Scoobyten

iTrader: (1)

I know recirculating ones are probably best but I would like blow off type. What price range are the Forge? And are there different models? Thanks.

djandyg

iTrader: (2)

check out scoobyworld.co.uk

theres a few forge options, theyre fairly cheap - HKS SSQV's are pretty good as well and give an awesome sounding 'chirp' instead of a whoosh.

Caged "R"

iTrader: (4)

I've got one of these done 200 miles from my car

https://www.evo-parts.co.uk/eshop/in...oducts_id=7787

blackcountryboy

iTrader: (3)

i have a hks ssq version 3 in black limited edition i put it on my car its only been on 2 weeks awesome sound (chirp) still mint condition all in the box with T pieces etc and clips with flange. going back to re circ as i wanted to try dump valve but not for me. prob best sounding dump valve if your interested pm me
http://www.templetuning.co.uk/hks-ss...ion-5602-p.asp

Scoobyten

iTrader: (1)

Can't really afford any of these at the moment..... Any cheaper alternatives? Or I may jus consider a recirculating one if any cheaper.

alcazar

iTrader: (2)

Recirculating one: cheaper, readily available, doesn't upset engine, uses less fuel, doesn't cause borewash, or damage the cats.

Scoobyten

iTrader: (1)

Seems like good enough reasons to get a recirculating one. What's borewash? Something to do with oil?

And thanks for the offers on HKS but still deciding. ;-)

djandyg

iTrader: (2)

dumpvalve may cause very slight overfueling on gearchanges....borewash being the cylider bores 'washed' with fuel from overfueling....

...in reality the overfueling from a dv here is not worth worrying about tho imo

A standard recirc can be picked up here fairly often for next to nothing but obviously wont make a noise.
Turbosmart are also good brand. HKS SSQV gives the best sound though imo.

wr pete

iTrader: (1)

Borewash is over fueling washing the oil away from the cylinders which causes bore wear. oops as said above, maybe I should read more before posting.

Scoobyten

iTrader: (1)

Right so i'm guessing piston rings too? I hear the recirculating ones keep the turbo spinning? Any difference in performance at all?

djandyg

iTrader: (2)

The piston oil scraper ring is designed 'scrape' the oil away from the bores as the piston moves down on intake/power stroke anyway....
As i said, in my opinion its causes a minute amount of overfueling anyway so dont worry too much about it.
The recirculating valve simply dumps the excess air back into the intake system to be used up whereas the VTA dumpvalve will simply vent it to the atmo.

firebug

iTrader: (3)

i had a forge on mine for nearly 8years. had to change the spring after 5 years. cost £7 or so. no noticeable difference to power at all really. and no damage to the engine either. car had 145k on it when i sold it. and having a full decat and induction kit without a remap didnt blow the engine up either.
i have a standard recirc for sale if u want it tho.

wr pete

iTrader: (1)

It will run a lot smoother with the oe valve and idle better and be better on fuel, the thing with vent to atmosphere valves on a maf based intake system is the air thats being dumped, the maf has already calculated fueling for, so it will cause the car to run a little bit rich when you come off the throttle. some people dont mind this but over a long period its not good news, the oil ring is supposed to hold oil to keep the bore oiled as the piston travels up and down the bore, the scraper ring removes excess oil from the bore. over fueling washes this oil away therefore causing undue wear.

alcazar

iTrader: (2)

Not wishing to cast aspersions, but please beware of people telling you that in their opinion you shouldn't worry about this, or that.

THEY won't be paying for any repairs. Better safe than sorry.

Mine runs a Forge recirculating d/v, it is plenty loud enough through the huge cone filter, (running MAF-less).

Scoobyten

iTrader: (1)

I'm probably going for the recirculating valve but 1st i'm going to try and service mine with some new castril LM grease. Might save me alot of money. I have some purple coloured dv, don't know the make it doesn't look like it cost an arm... Hopefully it does the trick.

Scoobyten

iTrader: (1)

Does anyone know what a MAF tune-up involves?

alcazar

iTrader: (2)

Sounds like b/s to me...........

Scoobyten

iTrader: (1)

Sorry, B/S?

wr pete

iTrader: (1)

Heard of this in the vw audi world but not on a scooby.

The Maf is a mas airflow sensor it reads the amount of air coming into the engine it is possible to adjust the readings from the sensor inside the ecu, its called re scaling but as far as tuning the maf on its own its not possible unless they mean moving the position of the maf in the intake duct to alter the base readings not sure tbh i think you would need to ask a mapper about this 1

alcazar

iTrader: (2)

It's brown and smelly and it comes out of a bull.