hi people.
can u lot tell me why so many people on here say the standard re-circ valve is better than an after market damp valve i.e blitz. do they make things break or is it just because they are a bit chavy. although i do like the sound of a dump valve. i must be chavy lol

 

Think they can **** up the air flow readings to the ECU.

 

The ecu tells the engine how much air to take and then you are blowing it out , a dump valve can also create a vacuum on the turbo which does your turbo no favours.
I also like the sound but prefer to have standard to be safe (Had a lot of imprezas with dump valves and never had any problems though).

 

Much better put than mine

 

its the old timers that dont know what a chav is that call it a chav valve. chavs arnt even old enough to insure an impreza or similar powered car.
ive had a forge one on mine for over 7 years with no probs. ive put the standard recirc on twice and thought it was running better with the dumpvalve on. i prefer the noise of the i.kit and valve than of nothing at all.

 

ive got a hks ssqv on mine and no problems, although i adjusted a bolt on the bottom of it and it seems to of stopped working lol.

 

Yes they are, unfortunately, and have been able to for some time.

 

The Search button will answer this question for you very effectively, did you give it a try?

 

keep standard re circ and your car will run a lot better and smoother after gearchange and idle etc etc.

however ive got a blitz supersound on ebay just now should you feel the need to get one you might as well make it a descent one lol

 

splitpin, yes had a quick look but not had a proper strait forward answer ie good or not good. mixed reports. is it just personal preference.....

 

Well, from a certain point of view, everything you do to your car is personal preference isn't it? Ultimately you can do what you want with it.

However, from a technical point of view, no, it isn't preference at all. There are a number of good reasons why the standard fit recirculating dumpvalves (or bypass valves as Subaru calls them) enable the engine and engine management system to run more optimally than if you stick an aftermarket replacement on (especially if said replacement is externally venting).

There are two or three good threads discussing in detail the reasons why on that search link I gave you just now. Have a read - you'll learn a lot.

 

+1

 

If you are running with a MAF setup then you are taking away air that the ECU has calculated for. If on a MAP setup then it doesn't make a difference.

 

There is a load of twaddle spouted about them.

The fact that they often fail and leak whilst on the throttle causing in worst case borewash, and open on idle causing stalling and hunting.

Simom

 

is this refering to the bov or the recuirt cheers simon just that i run a forged recirut value woudl my car run better with a bov and yes i have a simtec so no maf

 

from my very limited knowlege i like them and the sound also but currently run recirc, but as above yes all the old timers on here i dont think know what a chav is so chav valve suits them lol, are they not numptys that wear burberry hats and glue sniff!! hardly impreza drivers as split pin says!! maybe one or two but thats it!!.
as simon above says as well they do dometimes fail as can everything else on your car!! i have yet to hear of one causing serious problems there are thousands out there been running them for years and years with no issue

 

I have a blitz one on mine, it's coming off purely because I drive the car hard and the constant wooshing noise is anoying now!!!

 

Not heard of borewash, then?

 

forge dv (atmospheric) running fine no issues what so ever,. only it blows grannies off the street, ah well,.,

 

so its the bov that can cause bore wash then

 

the atmospheric valve can cause bore wash,. ie the one where you use a blanking plug when installing

 

so what is best with a front mount, get an adaptor and fit the re-circ, is and aftermarket

re-circ different to the standard one?

 

yes i have heard of borewash alcazar but also know literally hundreds of people running them with no issue and have never had done!!!!!!!!

im not saying that you wont have a problem with one!! what im saying is the percentage of people running them compared to the percentage of people that have had problems with them is neither here or there.

do you have a percentage rate of how many owners have had bad problems with say mafs? to be one of a 100 things on your car??

i.e minimal or you should be telling everyone to run mafless cause they can go!

 

As I pointed out recently to another member on here, simply because your car SEEMS OK and you have done no checks to see if it IS OK, doesn't make it right to come on here and tell others that it categorically is fine, so go ahead.

Some years ago I got myself into a situation where I had no recourse but to put 95 octane fuel in the car. I had no octane booster. I got away with it.

Should I now post on here that it's fine and does no damage? I think not.

In the end, both the OP and yourself will do what you want, because it's your car, and in your case, because you know better than many experienced folk on here. Folk who HAVE done the research;(

OK, it IS your car. Do what you like. But don't whine on here when it goes pear shaped and PLEASE don't advise others just because it SEEMS OK on your car.

 

only if it is faulty and openning on cruise (which more owners don't notice).

 

thanks alot for all this feed back, i cant believe it, but from what ive read im not going to break my motor by getting one. ive done a faw mods ie fuel pump, boost controller, turbo back exhaust, pipa cross induction and front mount. next is a simtec. oh ye the car is off the road before any one says i need to get it mapped. its all being done before its back on the road/track.

 

If your fitting a front mount you will need a remap anyway so shouldnt have any problems.

 

so what would be the signs of this open at the wrong time then simon

 

i dont run an after market dump valve i run a standard recirc valve did you not pick that part up?
and also i stated IM NOT SAYING IT IS GOOD OR BAD it was merely an observation from other people i know.

look this debate has being going on for years nearly on page 1 evary other night, YOU CAN GIVE AN OPINION AND SO CAN OTHERS THATS IT.

what i take offence at and a huge amount of other people on here as well is the way in which yourself and a handful of other well known names talk to people

 

But if you have a fmic and a maf, won't the risk still be there?