deedubbs

can any 1 help me just fitted an ajustable dump valve and my car runs fine wen moving put as soon as i take foot off pedal on tick ova it almost cuts out?????whats it sposed 2 be on on tickover 10000 revs ..cheers

Curtis450

Yes tick over is between 750-1100 matey. You must have a leak somewhere because if you've wired it all up, on tick over, it shouldn't leak. But it has to do with the MAF sensor near the air filter, d.vs upset them, your best off getting a remap after fitting one ideally.

But as I say, I think you have a leak, where have you placed it? and where have you connect the other end [smaller end] to?

deedubbs

ive bunged the air filter side up pal is there any danger 4 my engine till i get a map ?

Curtis450

Erm, what do you mean mate??

Curtis450

Are you telling me you have covered up the maf?

deedubbs

yeah mate shoudnt i have??ive connected the dumpvalve 2 the right hand side and bunged up the left side..with the air filter on it..

alcazar

iTrader: (2)

I think you need to post pics of what you have done, sooner, rather than later

Curtis450

NO you shouldn't have. This sensor tells your engine how much air is going into it, and tells it how much fuel to add. Covering it up will cause all sorts of problems. Uncover it mate, it will be ok, the only issue it will cause is after letting off throttle your engine will run rich because the MAF will be telling the ECU x amount of air mass is present when in fact the dump valve has let it go. But thats nothing to 'damage' your engine, this is why a remap is the way forward...

However covering the MAF up is not good. Un cover it and I'm sure you'll find your idle back to normal.

Curtis450

The dumpvalve has to go AFTER the turbo outlet mate, putting it between the air filter and turbo will do nothing whatsoever. It is there to dump excess boost from the turbo. The other end of the dump valve is connected to the inlet manifold, witch is after the throttle.

deedubbs

un covered maf it was still same pal..ive capped it bk on and ive put a harder spring in dump valve and tightend the ajuster it aint as swooshy but the idle bk 2 normal..thanks for the info

Rob Day

iTrader: (78)

Bin the 'Adjustable Dump Valve' and revert back to a standard recir!!

Job fixed......

Proby521

iTrader: (1)

+1

f1_fan

iTrader: (9)

+2 although the last time I told someone that on here I got told I had no idea what I was talking about

Rob Day

iTrader: (78)

You don't

Adjustable **** valves are the future if you wear a Shell suit & burberry cap ....

lordharding

iTrader: (1)

advertise. The dump valve on Ebay suitable for a Scooby for a McDonalds car park cruise ;D

More problems then they are worth dump valves

deedubbs

my bros had 2 classic scoobys 1 was a 94 wrx other was a 2000 sti they both ran ok with dump valves also he had 2 evo 4s and an evo 5 all ran with dvs no problem...is it becouse u need a twin piston instead of a single one?..each to there own tho i like the sound of dvs

alcazar

iTrader: (2)

Three points need making:

1. Your car ALREADY HAS a dumpvalve, the one Subaru fitted when it was built. It's a recirculating type and does the job it was designed to do, perfectly well unless you upgrade the power output of the egine by a large margin. Not only does it do it's job perfectly, but it allows the engine to run as it was designed to do, with no danger to it.

2. What Evos do or don't do, has no bearing on Subarus. They are entirely different. Just as people shouldn't rely on what was right for an RST being right for a Scoob, as I've seen on here too.

3. Stick with the OE dumpvalve, or an aftermarket recirc type.

If you want to hear it, run with an induction kit, but get the car mapped for that before doing many miles and beware of induction kits on later cars, their MAFs don't like 'em

53

iTrader: (41)

Looking forward to your rebuild thread

Why cover up the maf when you can unplug it completely

midnight

iTrader: (10)

why have you put a harder spring in as all this does is make it harder for the car to dump the excess air and is almost the same as running a car without a dumpvalve - meaning the excess air is forced back through the turbo ,which unless your sponsored by the subaru wrc team might cost you a few quid in the very near future imho.

f1_fan

iTrader: (9)

I would just take the MAF out and throw it away as you don;t need it in this set up.

deedubbs

ok thanks for the help lads

sonic93

iTrader: (16)

had this prob mate i bet u got a single piston dv need twin piston for a scoob

awdx4

I thought I'd toss a spanner into this thread, being a newbie and all that ;-)

My car is a later model with the original DV bolted on the inter-cooler, I'm assuming the one in question on this thread works on the same general idea. I get the general idea from replies already here that an element of risk is present in what's being done by deedubs, whilst trying to get the dump valve a-whooshing. So at the risk of making an ar$e of myself, here goes.

Maybe it's possible to fit a bung in the recirculation pipe as with after market DV's and just let the original valve dump to atmosphere and save the hundred quid or so for something else? I may be being too simplistic here or just plain simple? :-)

dan83590

+3



How many more times are we going to read about this. I've said before and I will say again. What you need to do to fix it is wind down the window and shout 'I'm a ****' out every time you change gear.

OE Recirc works so why change it for one that does not......!

lordharding

iTrader: (1)

Throw the dump valve away or sell it on eBay to a McDonalds car park subaru owner
Too many problems with them in general
Money can be saved for better things brakes , handleing etc