M0NEY

Looking at dump valves and some people say go for HKS and others say that the HKS looks like a kids toy and to go for the Blitz as this is much better!!! So confused! Hks or Blitz???

Views on which one please.

Cheers guys

ustolemyname??stevieturbo

iTrader: (1)

just depends on what noise you want. No performance gain with any type of dump valve. Just noise

M0NEY

so it doesnt matter which one then! I thought the noise was the same.

Anyone know the difference in the noise between the Blitz and HKs then? (ie which one is louder, sounds better?)

Someone said the HKS works better as well as its sequential. Is this true?

Mistacain

Check out this link:
http://socalsupras.com/tuning/blowoffvalve.html
it'll give you an idea what they both sound like...
If its just loud noise your after, check out the TurboXS dump valves (i've got one fitted on my MY98 )

teknopete

The blitz looks the danglies (like a small carb) and IMHO sounds eaqually good. If plumbed in properly when it dumps u`ll see peebs dive for cover It`s like a tyre bursting.

Pete

M0NEY

cheers guys!

I spent my night listening to dump valves! lol. Quality though

==WRX==

sorry to point it out, but a Blowoff valve will give you a performance increase due to the fact that it release back pressure that would normally cause the turbo to slow or even stall, hence, quicker spool-up time, and in turn, quicker boost responce, which in the long run will help your 0-60 and your mid range pick-up. ( not much but it does )
please feel free to correct any mistakes, but i think im 95% correct on this

theres my 10 peneth.......

lol


I run a HKS SSQV.....and it sounds nothing like a jumped up Punto turbo....bonus

[Edited by ==WRX== - 11/25/2002 8:50:43 PM]

dhorwich

Had both the above dump valves..!!! also had a Greddy, and a bailey DV26 which where pants..

At the moment i have a HKS SSQV but if i where to buy again i would go for the blitz.... the HKS one is a lot higher pitched...

Here are some pics of my HKS fitted to my MY95 WRX..!










Oh, and its one expensive kids toy.. looks good to me better than your usual crappy bailey DV...

Dan

M0NEY

cheers wrx.

And you to dhorwich. Why would you go back to the Blitz one then?

dhorwich

I prefered the sound of the blitz, however ive been told the newer ones sound different.... It was a more deeper (volume) of dump..

Dan

teknopete

WRX,

Had a real lengthy discussion in the past about turbo backspin, rogue pressure bla bla bla and sorry 2 say m8 it`s not even worth mentioning. I`ve run my wrx with 3 different dump valves in the past and found the best solution to be "no dump valve" If u r
off the throttle long enough to slow the turbo any noticeable amount from 100,000 + RPM then u need 2 sharpen up u r gear changes In the event u have a FMIC think how long it will take to repressurise the pipes if u dump all the pressure The end result is it takes time b4 usable boost is generated, now thats worth thinkin about.

Pete

Jonto

Muppet question i know, but are there any d/v's that sound like the waste gate chatter of the WRC's ?

Forge dump valve maybe ?

which sprig though ? RED ? BLUE ? GREEN ?

Cheers

M0NEY

No dumpvalve???? You gotta have a dump valve! lol

==WRX==

the HKS SSQV does just that matey Chatters away nicely
( silver insert )

nom

Time to fill the tubes in a FMIC? Ohh, say 50 litres, so that'll be... around 10ms. Not a lot

==WRX==

nom, what the hell does that mean....lol
please translate....lol
If its important, i need to know, and if its not im just nosey


cheers

jay

teknopete

Nom,

Hmmm 50L in 10ms, now are u basing that on the 1mile columb pressure or what ? Even taking 10ms as correct bud, it can make the difference between fast & last at the strip Just speaking from experience m8.

Pete

M0NEY

looks like blitz then

nom

That would be at 1 bar absolute at 'typical' gear change.
More than halve it (so around 4ms, I'd say) running at 1 bar positive. If the tubes were filled with a vaccum. Which they're not.
All in all, anyone who thinks that an FMIC has 'extra lag' because of the tube has a good imagination

nom

Oops, Mr Brain has been having time off recently
I've talking hot air (should have been cold!).
Anyway, there's still poo-all lag

teknopete

And less than poo-all without a DV
Remind me Nom which FMIC & DV combo are u running ?

nom

APS both.

For another opinion, Theo (EvilBevil) has a Pace & was expecting/tried to imagine lag on changing to a FMIC. He couldn't find anyway.

How fast does a pressure wave move? Hmm. Speed of sound. How fast is that? Oh, quiet speedy...

teknopete

And you`ve tried it w/o a dump valve?
If so then you may or may not agree with the original point made many posts ago and the whole point of posting a reply to this topic in the first place.
To save u looking back, the whole point was that a dump valve actually slows you down and turbo backspin & stalling etc is not an issue. If you don`t agree with that then we`ll just have to agree 2 differ

Have a nice 1

Pete

nom

Yep - I don't like dumpvalves. They slow everything down. Much better without. I find the engine responds wayyyyy better.
Unfortunately, my turbo does like them, so I have to put up with the thing

Turbo_Steve

OK.....What does a SEQUENTIAL blow-off valve do then?
Recirculate until high boost?
Make more noise?
Feed the cat when you are on holiday?

M0NEY

thats what i wanted to know! What does the sequential bit mean on the HKS one then??

Turbo_Steve

=nudge= psst...money....I think that shut them up, huh?

M0NEY

lol

I even did a search on this and found nothing (or was that about the HKS downpipe - cant remember! doh)!

POC was telling me HKS was much better for him as the Blitz didnt work as well. But 2 mates have a Blitz on their skylines and that sounds very nice indeed

Idea, go for the Blitz, get bored in a month and swap for the HKS

MorayMackenzie

IIRC, the HKS SQV has a two stage valve system that includes a small, fast responding first stage valve (allows fast response for small "dumps") and a larger, slower acting valve that has a much higher flow capacity , for larger charge "dumps".

As with any dump valve, the SQV functions by dumping charge pressure, thus increasing lag whilst reducing stress on the turbo. There is a definite improvement in response when running without a dump valve.

Turbo_Steve

So, at a modified boost level, keeping the existing dump valve will (as long as it doesn't 'leak' charge) mean that you dump a small amount of charge, REDUCING the stall on the turbo, but perhaps retaining throttle response?