jen98impreza

I am picking up a 2000 uk spec impreza,and was thinking about getting a dump valve. Basically,i would like to know the pro`s and cons of getting one,and will i need to mess about with anything else in the car in order to get one? Any opinions,idea`s or constructive critisism welcome. Thanking you in advance...

Brun

They do zero for an Impreza other than the noise.
If you want one - get one. I did
You will find that a shed load of people will be along in a min to explain how "chavvy" they are - **** em

corradoboy

The car has already got one and it is the best one for the job. Spend your money on chassis/suspension/brake mods if you want a proper fast car, leave the Chav $h!te to the Lax Power Nova/Saxo boys.

So **** me

EOEUMC

iTrader: (5)

I had one on mine and loved it I was smiling all the time, but then it wern't working properly and I had to get rid of it Got to get another one though

jen98impreza

Thank you all so far.... So basically,they do nowt for the car except make a nice noise?! Well,granted,thats why i wanted 1 but i thought maybe it did "something" with the power/performance? **** it,i`ll get 1!!!

corradoboy

Enjoy the overfueling, jerky response, bore wash, thin oil, cat damage, valve damage and backfiring

£200 to spoil the running, reduce reliability, cause damage and look/sound silly One born every minute

jen98impreza

nothin like tellin it how it is eh?!!!

jen98impreza

Jesus,were you molested by a dump valve when you were a kid or somethin? Really dislike em don`t ya

corradoboy

I don't care for dump valves, but I'm quite into being molested if you're offering

funkyspider

You may find this a source of good info, esp post #19 by Andy F - a well respected subrau builder and mapper.

https://www.scoobynet.com/drivetrain...l-pschhhh.html


Personally I think my MY01 runs much better with the standard dump valve on rather than the SSQV VTA I had fitted for a while - I did like the noise tho, but I'm a big kid

And keep an eye out for MAF related problems on a MY00 - The MAF is weaker on 99/00, not a particularly expensive part to replace if it does have a problem, but can upset the running in quite a major way if it fails. A VTA dump valve won't cause MAF issues but it may cause similar symptoms masking a MAF issue which may be there.


Don't read this as totally negative, you may fit a dump valve, run perfectly well and love it, and your MAF may be spot on for a long time - just pointing out some issues which 'may' occur.

EddScott

What he said.

Although I do like the noise and pops and bangs

Do a search, you'll find loads of info on here. IMO they sound cool but bugger it up. I also think the jerkyness can lead to gearbox damage once you start bumping up the BHP.

Multijfj

LOL


....

Iv got one, and its the loudest thing I have ever heard, I love it.

Not had any problems with idling misfire etc. backfire, its been fine.. so far

EOEUMC

iTrader: (5)

Different people have different effects (if any at all). You could say the same as an example. Buying an old Skoda and 1 in 10 bought will run like a dream while the other 9 should of been scraped years before.
I havn't actually looked myself, but is there any factual evidence that a vta dump valve can cause so many problems etc?

funkyspider

The idea behind them causing problems is down to the way the fuelling works. At any time the system contains a metered amount of air, the ecu will mix the correct amount of fuel for that amount of air. If you vent the air out through a VTA dump valve then apparently the same amount of fuel is still added as the air has passed through the MAF and has already been metered. This causes a very rich mixture until the dump valve closes and the mixture is correct again. Whether this causes any actual damage I don't know. Other problems are associated with dump valves where the spring is too soft causing dumping when you don't want it to happen.

Have a read through that post I mentioned

Elmer Fudpucker

Blow-off Valves

jen98impreza

LOL

jen98impreza

Oh god,now i`m torn,shall i,shan`t i ..............

dan83590

I agree with this, I fitted one and it was in the bin within 1 hour, no kidding either. I wished I had spent my money more wisely.

jen98impreza

On sex,drugs and rock n roll?

jen98impreza

Thanks for the feedback,much appreciated

dan83590

2 out of 3!

jen98impreza

Only 2??????

nice guy

So fit it so it gives the noise but is still metered by the maf.... it's not so hard really!

corradoboy

It's the fact that it's metered by the MAF that's the problem. The ECU fuels for the MAF metered air, and when that air is lost in a rousing ptsssssssh!!!!, the fuel is still injected as if it's all OK, resulting in borewash, oil thinning, backfiring, cat damage, interupted exhaust flow, valve disruption and potential damage. You can run a BOV if you run an ECU which doesn't use a MAF, no problem.