Recirculating DumpValve
Turbo Mini Forums

What would be the avantages of one of these?

Where would it recirulate to?

Cheers, Dan

you just dont get the ptish sound-isnt that a disadvantage?

im thinking of putting one on myself as i dont like the ptsssh noise....a standard cosworth recirculating dump valve is only about £14 from ford when i last bought one and could be made to fit very easily

mark

The turbos we use dont need a dump valve as they only help on cars that run BIG turbos/boost to relieve the stresses on the turbos internals.

-MINI CLUBMAN 1380 TURBO-

I thought it may be more efficent as it doesnt "Waste" the air as such, just sends it back round the turbo....

Or am i thinking rubbish...?

The recirculating part goes into the turbo air intake, which also connects to the air filter so any pressure on the intake side would exit through the air filter wouldn't it?

I sure that the advantage is that they are quiet.

Got mine off a old SAAB for a few quid down the scrappies!

What do you call big boost though? Im learning as i go!

Bear in mind a fair number of members are running circa 20psi

just a thought.

i would recomend one at all boost levels to reduce lag , as it helps to keep the turbo spinning ,its a necessity obove 14 psi because the turbo shaft can snap from pressure build up around this figure

A recirculating dump valve will put hot/warm air back into the turbo, (only a small amount though!) especially if you dont have an intercooler,

I would recomend some sort of dump valve, theyre fitted as standard to many production cars

Phil

Hi Stuart, I no that's the theory about dump valves but in my experience, dump valves, on Minis any way do nothing to reduce lag between the gears, they can in fact do the opposite and let all the boost out and make the lag worse. I know of one car that this was the case. and in my own car I've done tests with and with out one, I can't tell any difference between it.

I've only got mine to show off to people that i have a turbo car! LOL

Edited by Miniwilliams on 12th Sep, 2004.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

the old to dump or not to dump debate again

no longer a series, but still 1.3 turbo.

i have seen a turbo shaft break that wasn't using one at high boost (16), i think with lazier road use gearchanges benefits are better than the 1/4 mile quick change /wish i had a dog box type , i think the throttle has to almost close to make the dump valve work correctly
what type have you tried ?

I see what you mean about it might help if your changing gear slowly, but then whats the point?

I tried the bailey twin piston one, and the evo type single piston with that's adjustable, I've tried different adjustments.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

i reckon the re-circulating dump valve might be more efficient with it dumping air back into the system, or would it possible cause the turbo to surge??

good point about if your not running an intercooler though!

Dan it prob will make no difference as what little air comes out of the dump vlave is nothing like as much air that's being sucked into the blower.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

protection against backfires, or stalling is worth considering due to the damage it can cause.
theres always exceptions to the rules and if it dosen't work don't use it !
every one has different parts and different driving styles, as long as your confident its not working thats what counts !

that's true mate:)

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
First 5 port miniturbo to make over 200 bhp on Injection?

http://www.mattwoodsphotography.com

I know cossys on 25psi with no dumpers :p

To dump or not to dump, that is the question. wether you want to sound like a bus or not is up to you!

alex

AlexF

i do, fares please!

also worth noting that many dump valves allow unfiltered air into the system at tickover/ off boost , use a filtered one or recirculate!

I'm thinking of fitting such a device as I really detest the boy racer pssht sound. But.. If fitting a hose from the DV and to the filter pipe, will the length and diameter of this pipe be very important?

i use a bailey none recurc valve, i think at low speed driving and gear changes it actuall makes matters worse!

but on high boost quick gear changes my thoughts are the same as stuarts at vmaxscart

its a must! the only problem is like whats mentioned, theres no provision to filter the air when the valves open which isnt.... a good thing.

Fitting a resircualatitng one, and plumbing it after the airfilter sorts this :)