Hi
Can anyone give me a clue as to why the sierra sapphire cosworth 4x4 that i recently bought does not have a dump valve!!!!

 

Someones taken it off, as std it should have one, a recirc one going back to the airbox.
tabetha

 

I thought as much.
If i fit a dump valve on the cold side of the engine, in the intercooler pipe, which vacumn pipe should i tap into out of the intake manifold.
Any input would be appreciated.

 

dumpvales are for gays

 

If you do put one on DONT T into fuel reg or the map as they are very inportent

 

Agreed, i was gutted when i had to fit one

 

why did you have to chris?

And no dump valves are for the cool.. people who cal them gay are gay

 

If a DV really needed?

 

some say yes some say no, depending on boost according to most, my own view is yes they are beneficial after much nagging by my lad to get some chatter I disconnected mine and the difference was horrendous, laggy as shit, I stopped after going through town with a "wounded" sounding car and reconnected the DV, ah joy nice and crisp again.
Just try it is the best advice decide for yourself.
tabetha

 

..........from what i remember (havn't used one in years) it was the other way round,car felt better without

 

its not what it sounds like you>>>>>>>>>>>>>>>>>>>>>>>> muppets!!!
its what it can do for your engine!!
same goes for exhausts!!! theres a dick near me has a gt4 toyo with a big can on but connected to a small tail pipe- why?? cos it sounds good/-ff sake!!
get real-----if you cannot do it right DONT DO IT AT ALL YOU JUST LOOK F----G STUPID

 

.....who the fuck are u...

 

A man with 89 posts.

 

I must admit the chatter sounds mint but i will keep my dv on.

 

Just a question if they are not required why did ford fit them. Im sure they did their homework before going down that route.

 

and here we go again. another 500 page thread

Had one on my ERST, the car runs sooo much better without it!

 

a failsafe against nutters modding there cars

 

same here mate.

 

might take mine off and see,also gonna take off the cone and fit an airbox and see if it really is better

 

https://passionford.com/forum/genera...ve-or-bov.html

scroll about half way down past all the none usefull posts and its explained what dumpvalves do and why u should have one.
a dump valve will reduce lag by function. i cant understand why you would have less lag without one.

 

not one bit of "proof" has ever been shown that u should/need to use a dump valve......and i've had turbo cars for YEARS and always removed the DV.....i've been running my t38 @ 2bar for 4 year now...........

 

The purpose of a blow-off valve is to release built up pressure in the compressor housing into the atmosphere, significantly reducing the likelihood of backspin.
The turbo stays spooled up, there is no compressor slow down due to stacking.
and the turbo lives longer due to boost not stacking up on the compressor blade.
Stacking is when the pressure in the intercooler hose's is greater than the turbo output, that's the noise you hear when you change gear with an element air filter (flutter or chatter) and it's very bad for the turbocharger.
With a high boost engine stacking is even worse!
Its not magical or make believe, it scientifically and mechanically serves a purpose.

 

+1

We had one on our ERST , Took it off and it run loads better


Brian

 

+1 but there again you do get people who think they know better than the experts, and some do it because they don't understand it's function and prefer turbo chatter but if you can understand what the chatter noise is you can understand why it's not good.

To the ERST people were you using the correct twin piston type?

The main factor being the amount of boost produced the higher the boost the more damage will be done to the turbo.

As to your question as said do not T into the Fuel reg or MAP feeds they should be connected directly to the plenum, there should be a spare nipple you can connect to, I to found car run better WITH it.

Martin

 

well if the ERST owners didnt use a twin pistons the car wouldnt run at all

with a twin piston the car runs asif it has small air leak. Letting off the throttle causes the car to lung forward, the throttle is less responsive as it waits for the valve to close, also it actually takes longer to spool the turbo with DV as all air is removed from the cross over and it takes longer to fill again with a freewheeling turbo with no air in there.

 

I just heard of stories of people using single before sure you have to, so a "retorical question" so to speak, can not say for ERST but as I say on my Cos it runs better with one.

Martin