"was the unit mapped for the car? or just fitted without mapping?"

Just fitted .... it was a decent quality well renowned company.

"if so was the unit faulty?"

No, i stripped it to check and all was as it should be!

"and if the unit was not faulty surely mapping could have fixed the fuelling?"

Probably could have done, but why on earth would anyone spend out on a remap JUST to make more noise when a boggo standard oem recirc can be bought and fitted for less than £20 and instantly solve the running problems?

MattyB, sorry bud your on your own .... theres obviously a very popular different opinion to ours about trev valves ..... each to theyre own!

 

seeing as you would actually benefit from having any type of dump valve that's a bit rich don't you think? It's not as though your impreza is standard looks or performance wise and that straight away puts you in the so called "chav" category or did you get permission from the older folk first?

 

so in answer to your question you slapped on a VTA without any map check or tweak and expected it to all be ok?

 

what make was it?

 

I have made no comment with my opinion on wheather they can cause engine failure. I have no proof that they can and have not heard of an engine failure due to a VTA so I wouldn't make assumptions.
I have however seen first hand a car running like sh1te with a VTA and then once the VTA was removed it ran fine. Admittedly the car in question was not mapped for a VTA.

With regard to running without one and causing issues, yes completely agree. On tired old VF series turbos they were prone to damage by running DV'less but I am yet to see/hear of a car running a TD series turbo suffering the same issues.

 

It was a blitz.

 

Yes, I got permission

 

No, i bought a car with one fitted(more like inherited as i payed next to nowt). Was supposed to just be a donor for a project, but the wifes car broke down so she has been using it since .... VTA was fitted a week before selling and the problem just got worse and worse over time as the ecu adjusted fuelling to suit the random o2 readings it was getting from the lambda.

 

Similar principal though, the td series is stronger but not invincible so why would you question anyone on doing something very similar to what you have done yourself? You could prolong the life of your turbo by having something on it that was fitted from the factory could you not? just because you have not heard or have heard of something it doesn't make it fact, you have experience of one running rough and I have experience of one running spot on with a vta valve, I don't feel the need to try and belittle someone because I don't like something they have chosen to do or buy, the op didn't ask whether you or anybody else liked them!

 

Hold on young man, I have not belittled anybody or tried to belittle anybody. I have merely made comment on the FACT that VTA valves have no performance gain whatsoever.
If somebody wants one on their car then good luck to them, it's their car and I wish them well.

What gain could I see on my car by fitting a dump valve ?

 

Matty,

Youd maintain better spool between gearchanges and your turbo would last longer! im not saying it will pop tomorrow, but youve got to admit that if that turbo was run back to back with exactly the same turbo with a recirc, the recirc valve removing the back pressure would have to mean it would last longer!

But your right about the TD's .... they are a sheet load stronger than the vf's!

 

Going back over what you have said in this thread and others regarding dump valves then I think anyone would agree that some of your comments are belittling to some, chav, barryboy, trev lol, you must know what I mean? On a serious note, surely prolonging the life of your turbo by using any type of dump valve is a gain of some sort? As everyone say's, the standard recirc is fine etc so why change or remove it, surely as everyone says, if there was a gain to had by removing it then prodrive etc would remove it?

 

It's all Crap argument to be honest, there is some truth to it all whether anyone likes it or not and some just need to accept that, some like them and some don't, so what! If someone asks for your opinion then give it but why can't people be helpful and just let them know about vta valves that are known to cause problems instead of basically making it up and saying they will all cause problems for all Imprezas as that is simply not true, there is nothing wrong with warning people as long as it's truthful and not completely biased just because of your opinion.

 

To be honest chaps I don't usually comment on these threads but I was bored to **** at work and fancied a bit of banter...my bad, sorry fellas.
I really don't care if people wanna run loud dump valves, I've seen no proof of engine failure so good luck to ya. Just not my thing that's all.

I take into account the better spooling point though, I'll be sure to email the WRC teams around the world as they must also be oblivious to it also...lol.

 

You don't like what I post, put me on ignore. Or get over it.

Maybe it's you: you need to accept that other just might know more.............

 

this topic is going way off topic just because some idiots dont like the noise of a dv, and spending a few hundred quid on one, the guy only asked which one gave the better sound so why the hell your slating the guy,

if he asked for the pro's and con's of a dv then ok go for it, have a big girly argument. thats why i have forums like this. you ask for advice, and then c**ts and to join in

 

Back to topic loudest BOV

 

I was run before Forge VTA which has been fine,this time we are run VF34 and we are been advise to run DV or recirc,we are opted for VTA

Now we are running MD321T and Mark@Lateral performance said,he don't have problem if we are want run without the DV,turbo will be covered by warranty,but if we will use excessive/more than usual ALS our turbo will be not covered warranty.

On Garrett BB(Ball bearing) or TD range i would run DVless,these turbos will be OK,but on VF range i wouldn't run DVless or Recircless

Some people say,you will loose spool up if you will run without the DV,this i was think too,but after running DVless i think is just myth

To OP Forge VTA are good made and they're causing less problems like Bailey DV,plus nicer sound if you are running DVless with big one and noise of wastegate chatter is much nicer and louder than any DV

Jura

 

It's a public forum sunny, so you are going to get pubic opinion. You are only calling posters ***** because you don't like what they are saying...if the forum is that objectionable jog on

 

No no no Jura, have you not read what the others have said. Running DV'less will destroy your turbo and make it soooo laggy.
And from a man of your experience, I expected better

In all seriousness, the VF28 I removed from my car last year had been run DV'less for circa 5 years. When I inspected it for damage the only issue was a slight crack in the exhaust housing which wouldn't of been caused by running without a dump valve. The fins were perfect and had no play etc etc which 'supposedly' what gets damaged.
Also, I've tried a VTA dump valve on my car to see if it made any difference, guess what chaps, **** all. I didn't notice any difference whatsoever in spool between gears. If it had improved, the difference was so tiny it was not noticeable.

 

I just love it whern folk come on and call people who disagree with them *****

THEN I know who not to bother with when they come on later asking for help

 

If I asked a question and there were issues involved in what I was doing I would most certainly like guys to highlight the problems to me! That is what forums like these are about- it is to gather as much collective knowledge as possible in order to make your own decisions.

Moreover I would THANK guys who bring up any potential issues to my attention- but I would still do the research to allow myself to make my own decision. I most certainly would not continue on the path of arguing a point....lol.

You want to prove that your car can run fine with VTA- the best way to do it??

Fit the damn thing and let us know where you are at this time next year, I for one hope you get the noise you want and the car still runs a treat, but that's neither here nor there.
Use forums the way they are intended, don't get dragging into "point proving" - THAT is a very good way to waste hours of your life you could otherwise be enjoying!

 

Good post. I agree with you.

 

You clearly do not know more or is that an admission of the fact you already know not all vta valves cause problems? I think you need to accept the fact that people can do what they want, It seems from yours and others posts that what I have been saying has either not been read, misunderstood or you have your heads so far up on your own backsides that you think everything you say is gospel, your not 100% correct and you just can't accept that fact. I have said this and will say it again, it is good that people have the information to make up their own minds but yours is not completely accurate and biased based on your own personal opinion, if you
know so much then let people know which vta valves do and don't cause problems.

 

First off, if you've read my posts, you will see that I ALWAYS say to the OP that it's his car so in the end it's his decision. I give him info to work with.

Secondly, you repeatedly waffle on about your mate's car which is spot on. How do you KNOW? It's been on a rolling road? Sorry, but it could easily still be rich on gearchange.

Lastly, you seem to be unable to understand how the basic Impreza dumpvalve is set up and what will CERTAINLY happen if you dump pre-metered air, so at this point, I will withdraw.

Best of luck to you and your mate. Hope you don't need it.

 

LOL,,, I love these threads..

Come on pikeyboy, your turn.

 

Alcazar, I have read all your comments and most you posted in other threads relating to dump valves also, I suggest you do the same and you might, just might understand what I am saying, over 10 years my friend has been running your nemesis on his Impreza, NO problems at all! There are lots of others doing the same with NO problems at all, I do understand how it all works if you read my replies, even if I didn't its still not fact that all vta valves cause problems, say what you want, I'm right in that respect and your wrong and I will stick to that until you can PROVE me wrong instead of throwing theories at me.

 

Just to add, Alcazar you do tell the op its his or her decision, that's true but you give biased information which is not entirely true, as I said, if you know so much then let people know which vta valves are known to cause problems and which work, surely that is the right thing to do if your just trying to be helpful, your info is always one sided. As for needing luck, I'm just wondering as I have made it quite clear that my map has been tweaked to suit, are you now saying that it makes no difference and you know better than my mapper? If so how much do you charge?

 

I can't understand why we talking bout this, question was whats loudest, if were going to go on bout damaging your car, leave it standard, anything you add your in risk of damaging the engine, i don't like decals but thats got nothing do with topic.

 

would a 50/50 split be a worthy comprimise? 50% recirc and 50% vta?