switchable dump valve
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switchable dump valve
hi there, ive heard people mentioning having a dump valve that can be turned on and off but ive never been able to find, in detail, how to do this and its something i really really want to do on my erst s2. ive heard someone mention using an amal valve but then ive read elsewhere else that an amal valve isnt any good................someone out there must have managed to make there dump valve turn on and off as ive heard it can be done so i was wondering if someone can give me step by step instructions and a list of whats needed please. thanks in advance everyone
dave
dave
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It can be done
Basically using an amal valve to give you a switchable bypass of the vacume hose connecting to the dump valve.
However it gives you the same effect of having a dump valve plumbed into your system but without the vacume hose attached. I guess this means you dont get the positive pressure closing the valve when the car is on boost. When we did it we didnt notice any problems but its something to be aware of - you might have to get clever with some kind of boost switch that turns the amal valve on when the car is on boost to keep the pressure in dump valve while on boost. Then turning it off before the car comes off boost so that there is no vacume to open the dump valve.
Basically using an amal valve to give you a switchable bypass of the vacume hose connecting to the dump valve.
However it gives you the same effect of having a dump valve plumbed into your system but without the vacume hose attached. I guess this means you dont get the positive pressure closing the valve when the car is on boost. When we did it we didnt notice any problems but its something to be aware of - you might have to get clever with some kind of boost switch that turns the amal valve on when the car is on boost to keep the pressure in dump valve while on boost. Then turning it off before the car comes off boost so that there is no vacume to open the dump valve.
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Originally Posted by EssexBoyRacer
It can be done
Basically using an amal valve to give you a switchable bypass of the vacume hose connecting to the dump valve.
However it gives you the same effect of having a dump valve plumbed into your system but without the vacume hose attached. I guess this means you dont get the positive pressure closing the valve when the car is on boost. When we did it we didnt notice any problems but its something to be aware of - you might have to get clever with some kind of boost switch that turns the amal valve on when the car is on boost to keep the pressure in dump valve while on boost. Then turning it off before the car comes off boost so that there is no vacume to open the dump valve.
Basically using an amal valve to give you a switchable bypass of the vacume hose connecting to the dump valve.
However it gives you the same effect of having a dump valve plumbed into your system but without the vacume hose attached. I guess this means you dont get the positive pressure closing the valve when the car is on boost. When we did it we didnt notice any problems but its something to be aware of - you might have to get clever with some kind of boost switch that turns the amal valve on when the car is on boost to keep the pressure in dump valve while on boost. Then turning it off before the car comes off boost so that there is no vacume to open the dump valve.
The other way I suppose is to plumb a valve between the inlet hose and the DV itself, rather than off the plenum feed. Closed would stop any air dumping, open, it would dump through the DV as per normal
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hey, good feedback so far, any chance of actually having a guide of some sort on how to actually to do it though...................essexboyracer, so youve actually done this before ????. if so did it work perfectly ????.
cheeRS guys
dave
cheeRS guys
dave
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We tested the theory and yes it works, but never had a perminant installation.
although I did even have a switch all ready! (4th switch from the left was for the dumpvalve)
although I did even have a switch all ready! (4th switch from the left was for the dumpvalve)
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mate thats a nice tidy installation by the looks of things ....................one step closer to a guide lol.............what reason wasnt the installation perminant mate ?????. do you think you could maybe go more indepth with regards how its done because as i said its something im really serious about having on my rs but something i havent got a clue about . great progress though, atleast i know it CAN be done.
cheers
dave
cheers
dave
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It's easy peasy to do, i'm guna do mine when the car is back on the road, then i might make a quick how to....
EssexBoyRacer: Where are those switches from??? I want....
EssexBoyRacer: Where are those switches from??? I want....
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well the reason i worded it like that is cos u know how simple things aren't so simple to describe without pretty pictures
The idea i have is very simple and in theory should work......this is why i was going to try it also before i tell u how to do it just incase it doesnt go to plan
The idea i have is very simple and in theory should work......this is why i was going to try it also before i tell u how to do it just incase it doesnt go to plan
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back to the old how long is a piece of string question lol
hopefully fairly soon....i'm not sure if the amal valve will be suitable for the job either.....
hopefully fairly soon....i'm not sure if the amal valve will be suitable for the job either.....
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lol yeah i know what ya mean mate, thought id ask though, always good to hear of different ways of doing summin though, then hearing the results and then choosing the best way. fair play though mate.
whats with the wank force uk anyway lmao !!!!!
dave.
whats with the wank force uk anyway lmao !!!!!
dave.
#13
hello mate there is a electronic valve that sits on the bulk head with two vacume hoses that goes to it on a mk3 and mk4 xr3i this is what i used b4 i fitted a twin piston dump valve to my rs turbo the valve has two black wires that comes out of it.
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Originally Posted by davecosworth
hello mate there is a electronic valve that sits on the bulk head with two vacume hoses that goes to it on a mk3 and mk4 xr3i this is what i used b4 i fitted a twin piston dump valve to my rs turbo the valve has two black wires that comes out of it.
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Originally Posted by safechav
I'm not sure if that will do the job though because as mentioned its still a wise move to keep the boost pressure going to the dump valve
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Originally Posted by SWITCHBLADE
mate thats a nice tidy installation by the looks of things ....................one step closer to a guide lol.............what reason wasnt the installation perminant mate ?????. do you think you could maybe go more indepth with regards how its done because as i said its something im really serious about having on my rs but something i havent got a clue about . great progress though, atleast i know it CAN be done.
cheers
dave
cheers
dave
I'll have to do you a diagram of how to connect it up but its fairly straight forward
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Originally Posted by safechav
EssexBoyRacer: Where are those switches from??? I want....
I then got a m8 who works in a sign shop to make me up the symbols
The way I had them wired was so that when I turned on the lights, the bottom row of lighs on the switch (where the symbols are) would light up as part of hte dash lights. Then if I turned a switch to the ON position the top light would come on to indicate it was on (the boot release didnt have one because these are momentary switches - it doesn lock in the on position)
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Originally Posted by frog
Originally Posted by safechav
I'm not sure if that will do the job though because as mentioned its still a wise move to keep the boost pressure going to the dump valve
EssexBoyRacer I had every belief you were going to say they look expensive, to be honest i would love to use original switches which i can doctor, but its the symbols that prove a problem, but you may have just given me an answer to the problem (hint hint nudge nudge )
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Originally Posted by safechav
Originally Posted by frog
Originally Posted by safechav
I'm not sure if that will do the job though because as mentioned its still a wise move to keep the boost pressure going to the dump valve
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essexboyracer thatll be great if you could draw out a diagram for it including whats needed ie parts etc. all ideas and comments welcome by the way everyone, keep em coming !!!!
cheers
dave
cheers
dave
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ok sorry for the real crapness of the diagram but its late and Im tired!
Im not 100% sure that the markings are correct on the Amal valve. You might have to experiment! or someone else can confirm? But I think with the switch on the dump valve works. When u switch it off the dump valve will stop working.
If you swap pipes R and W around it will work the other way. I.e. with the switch off the dump valve works, with the switch on the dump valve doesnt work.
Im not 100% sure that the markings are correct on the Amal valve. You might have to experiment! or someone else can confirm? But I think with the switch on the dump valve works. When u switch it off the dump valve will stop working.
If you swap pipes R and W around it will work the other way. I.e. with the switch off the dump valve works, with the switch on the dump valve doesnt work.
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EssexBoyRacer: That diagrams ok, im glad you put that up before i ended up having a go and making myself look like a spaz
2 things though:aren't the amal valves jetted (so won't it increase the pressure needed to open the dumpvalve), and that won't allow the boost pressure to still go to the dump valve will it?
2 things though:aren't the amal valves jetted (so won't it increase the pressure needed to open the dumpvalve), and that won't allow the boost pressure to still go to the dump valve will it?
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Originally Posted by EssexBoyRacer
I had no jets in mine. Just remove them
One question ive always had over my head, the amal valve does a straight switch between the W and R connections yeah? So when one is open the other is closed and vice versa?
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Originally Posted by safechav
Originally Posted by EssexBoyRacer
I had no jets in mine. Just remove them
One question ive always had over my head, the amal valve does a straight switch between the W and R connections yeah? So when one is open the other is closed and vice versa?
yeah your right it switches between one or the other. The way the ECU varies this is by pulsing the supply to the amal valve so that it is constantly switching between the two ports.
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Originally Posted by EssexBoyRacer
Originally Posted by safechav
Originally Posted by EssexBoyRacer
I had no jets in mine. Just remove them
One question ive always had over my head, the amal valve does a straight switch between the W and R connections yeah? So when one is open the other is closed and vice versa?
yeah your right it switches between one or the other. The way the ECU varies this is by pulsing the supply to the amal valve so that it is constantly switching between the two ports.
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