wanna buy a wrc sticker kit and some lexarse lights too

 

no but I want some flames to go down my fire engine!

 

The Chav police has we have just been called have an inportant job to
Do
Educating the newby and low posters
What damage dump valves do
How sad it really is to go pssssttt
Rather then repeat ourselves
( although tubby is now covering our shift and has the ability to creat ten pagers )
It's best you the
Search facility
We tend to find dump valve fanboys
Are low posters
Get turned on by fake roof vents
Worship lexarse lights
Have some dodgy stickers on their cars
Have Argos gold plated products
Have ill fitting track suit bottoms
Wear oversized trainers and white socks
To their mating routines in Mc Donald's car park
Get agressive when the old hands try to save them

 

Ok, nozzzzaaaaaaa, seriously reply.

It is a track car, yes? How many track cars....from amateur set-up to pro jobs have you ever seen with a dump valve? The answer should speak for itself.

 

If you bothered to read my post you would see that there is a fair amount wrong with VTA dump valves! However, just to make it easy for you, I'll list the issues again:

Due to how the MAF sensor works, VTA dump valves cause your car to run rich between gear shifts (normally a recirc valve pushes the metered air back through the manifold in to the engine, letting it run optimally). This running rich causes your engine to bog down between gear shifts when accelerating hard, which in turn will slow the car down (not ideal for track cars, I hope you'll agree)

Another issue is the excess fuel in the cylinders has a high chance of damaging any cats in the exhaust system (if any are present of course).

Another issue is this running rich can cause glazing of your engines cylinders, and under consistent hard acceleration could cause unburnt fuel to mix with the oil in your engine.

Nozzzaa, I hope you found this informative and while I appreciate that everyone's tastes are different, there is no need to put parts on to your car that can be detrimental to its health. With regards to your loud exhausts comment, removing cats in the exhaust system when combined with a remap is a tried and tested method for gaining power, it works.

 

Sorry to hijack this thread somewhat but dump valves do confuse me slightly.
Above you've listed the disadvantages of a VTA dv, are these "risks" the same for an aftermarket recirc dv or are they safer?

I've also read a lot of advice about remaps required if fitting a DV. is this recommended for fitting both recirc and VTA?
Does the remap dial out all the "risks" listed above?

And finally, I take it the VTA dv's are the loudest?! lol

 

A decent aftermarket recirculating valve, such as one from forge, will work fine. It's not that all aftermarket valves are bad, it's just to do with how the ECU meters air going in to the engine and adjusts the fuelling for it accordingly.

As the name suggests, a recirculating valve pushes the pressurised air in to the engine through the intake in between gear shifts. The ECU is ready for this and injects a set amount of fuel to achieve what it thinks is the ideal air fuel ratio.

Now the problem comes in with vent to atmosphere (VTA) valves as this metered air is not put in to the engine, but dumped in to the engine bay. The ECU doesn't know this is happening until it's too late though, and so it injects too much fuel in to the engine under the false assumption that pressurised air will still be flowing in to the engine. The end result is you run the engine rich on gear changes, and any engine that runs rich will not run as well as it should.

As far as I know the only way to fix the issue with VTA dump valves is to have a MAFless remap, that is to say, remove the MAF sensor from the cars intake and have a mapper reprogram it to run without one, though I have heard mixed reviews about how well this works (no concrete evidence mind you, so I won't comment further).

Also yeah VTA dump valves are much louder than recirculating ones.

 

Cheers matey

 

That isn't Tubby's car by the way, he's being ironic by using it as his avatar.

From experience I fitted a Bailey VTA on my Hawkeye and it made the car run like an absolute pig, it soon came off and was replaced by a Forge recirculating valve.

At the moment I have neither a VTA or a recirculating valve fitted to my car, if you want a sound similar to a Grp B rally car then run DV'less and the noise is far nicer.

The only thing is that the car will need to be mapped for it and you would need to make sure that your turbocharger is 'man' enough to cope with the increased strain placed upon it.

At the end of the day it's your car, do with it what you please but don't pose a question on a public forum and then get upset by the replies.

 

fire fire..............

 

And you can put it out with your inbuilt fire hose.

 

last time I got my hose out in public I got arrested

 

No one on Type RA told you to pee off. You were given the best advice we could and it's up to you if you take it or ignore it.

I advised you to ask the question on this forum as I know some users here have them.

When I had my V3 STi it had a Baileys dump valve fitted and it seemed to run ok but the noise was really annoying so I fitted the oe recirc valve and it did run better.

As I said it's up to you whether you listen to the advice given.

 

gotta love newbs.

ask advice about something you want, get told not to fit one as they aren't good for your car.


throw your toys out the pram as its not what you wanted to hear.


why not just fit one as you want one and obviously don't want advice?

 

Not all noobs are the same though..... However the above is very true

 

This ^^^^^

100% on the nail Tubbs!

 

I wouldn't be putting drilled discs anywhere near it either - given that you use the word budget.

 

budget brakes, that will only end well

 

Indeed - wonder what it feels like when a budget drilled disc gives up as you're trying to slow down from 100+

 

exciting id say.


like wrestling a crocodile, could be ok but likely to end in pain and death

 

Loving the idea that we are the chav police.

And as for people who don't want people with alternate thoughts to post any more.......aye, right.....

If the posters on here who try and STOP people ruining their cars all stopped posting at once, a) the forum would be done for, and b) loads more cars would end up scrapped.

As I've said endlessly, it's YOUR c do as you please But don't come on here looking for advice about rebuilds or running problems when you ignored intelligent advice....not opinions, advice.

 

Perhaps evacuating your bowel in the process.
Best tuck the trousers into the socks, be easier to clean-up afterwards.

 

Got a blitz bov loud as ****

 

And that pretty much sums it up.

 

my last car had a forge BOV fitted when i got it, it sounded ok, but i noticed a slight hesitation after gear change when giving it some, was the same even after remapping it.

on new car it has the std recirc valve fitted, car now has same vf35, pinks and exhaust as last car and has been mapped by the same person (racedynamix) and acceleration is much smoother and no hesitation on gear change

i've tried both and i would recommend leaving the std recirc

 

Looks like I'm the only person to run one with any success. Mine was supplied & fitted by Harvey who told me there was no power advantage or disadvantage with my set up which was RCM400 Simtec Mafless etc & mapped by Bob. I don't mind the noise when giving it some, but have to say it's annoying when you want to potter about town, the psssst is a bit much constantly, & is part of my decision to go without any dump valve.

 

just for reference im not advising he dose fit a BOV. i know they play havoc with some MAF based cars. just felt like being the moral abitor for a couple posts
also might be a noob to this car forum but im not a noob to cars or forums

personally when im playing need for speed or something (which hasent been for a few years now lol) i always fit dump valves
but in real life not so much
i like a bit off turbo noise similar to the stock recerc valve and im sure most off you lot do on here to be fair. its part off the scooby noise. big blow off valves that sound like no2 venting every time you change gear sound silly and i cant imagine how annoying it must be on a daily driver

for experience on other forums and some admin work i think you lot could be a little (just slightly, no sarcasm implied) less harsh on some off the more common types on here lol

after all some off you may have forgotten. a large portion of people think scoobys are very chavy cars and big spoilers, bonnet vents ect are to a chav what shiny things are to a magpie

 

The answer to your success is in the ecu map, you're running a MAFless setup, therefore the air in the intake isn't metered.

 

dude I've just spent £400 on pads and discs is that not enough for a crappy track day

what is up with everyone taking the **** jeez

have you gotta prove yourself here before your allowed to say anything ! how the hell am I to know they are useless , they just sound good , or Paul walker makes them sound good when he's changing up through his 26 gears on fast and furious

yes I'm a frickin noob to imprezas get over it!
just so you know
I'm not on a budget, but the car is ! you guys are taking this way more serious than I am, if I blow the engine tommorow I would prob leave it in the hedge , I couldn't care less for what I paid for it , on to the next !

but I do appreciate the sound advice from few, I think ima get some induction a straight through pipe and then get it mapped see what happens, then ima bin it into a wall at 100 probably