Dump Valve Delete sound clip?
19 August 2011, 07:49 AM
#61
Well, gave it a try last night.
Pulled the small vacuum hose off the dump valve, plugged the rubber hose with a bolt and took the car for a careful drive. Car felt no different to drive, ho hesitation or problems. However, could not hear anything like a wastegate or dump valve noise from the turbo. Sounded quiet like I had refitted the recirculating standard dump valve again.
Basically I think if you are running the standard intake system with a panel filter upgrade it is too well sound insulated and a pointless mod! Haha.
Back to the HKS for me then!
Pulled the small vacuum hose off the dump valve, plugged the rubber hose with a bolt and took the car for a careful drive. Car felt no different to drive, ho hesitation or problems. However, could not hear anything like a wastegate or dump valve noise from the turbo. Sounded quiet like I had refitted the recirculating standard dump valve again.
Basically I think if you are running the standard intake system with a panel filter upgrade it is too well sound insulated and a pointless mod! Haha.
Back to the HKS for me then!
19 August 2011, 08:33 AM
#62
I can see your point with this and agree. Most dump valves may leek boost if done like this.
I am running a HKS SSQV and thought that it was the only dump valve designed to hold itself shut under boost if you know what I mean? But still down to the spring when it comes to negative pressure I guess so could still be a problem.
Guess i'll have to make a proper blanking plate and plumb things in properly for a test.
p.s. Thanks everyone for the sound clips. Some lovely sounding cars out there!
I am running a HKS SSQV and thought that it was the only dump valve designed to hold itself shut under boost if you know what I mean? But still down to the spring when it comes to negative pressure I guess so could still be a problem.
Guess i'll have to make a proper blanking plate and plumb things in properly for a test.
p.s. Thanks everyone for the sound clips. Some lovely sounding cars out there!
19 August 2011, 06:22 PM
#65
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Nice result! Great car to drive at that level arn't they? Brilliant fun!
You can buy a snorkus delete pipe. Or modify your own to remove the large bit at the bottom. Don’t want to remove it completely as car will then not use the front air duct and take air from inner wheel arch.
There are threads on how to mod them if you want to do it. No power gain, only bit more noise. Rather pointless. Google it, plenty of how too’s!
Would say though that they do catch a lot of flies & crap. So I wouldn’t want to run without one really.
Andy
You can buy a snorkus delete pipe. Or modify your own to remove the large bit at the bottom. Don’t want to remove it completely as car will then not use the front air duct and take air from inner wheel arch.
There are threads on how to mod them if you want to do it. No power gain, only bit more noise. Rather pointless. Google it, plenty of how too’s!
Would say though that they do catch a lot of flies & crap. So I wouldn’t want to run without one really.
Andy
Think i'll leave the snorkus and just play with the chatter when I go front mount and Cai mwahaha
Thanks Andy
Mike
19 August 2011, 10:28 PM
#66
A little clip of mine...A can finally put my foot down after Duncan mapped it on Thursday...
http://www.youtube.com/watch?v=l2QlOZhwd6M
http://www.youtube.com/watch?v=l2QlOZhwd6M
Last edited by jayallen; 19 August 2011 at 10:32 PM.
19 August 2011, 10:51 PM
#67
Im not being a w@nker here, but I did say
and that is all it should be 
test
you cannot do that it will leak on boost.
You need to run a pipe from d/v to a boost only side of the butterfly throttle so that the piston or diaphram in the d/v sees possetive boost when accelerating. And will not see vacuum when decelerating, this will ensure the d/v remains closed AT ALL TIMES, failure to do it in this fashion will result in boost leak and your car will run rich/retarded on boost.
The point at which it leaks will depend on the strength of your d/v spring and the volume of atmospheric pressure air you have trapped in the piston/diaphram side of the valve by "plugging it".
I hope this helps with the chatter
You need to run a pipe from d/v to a boost only side of the butterfly throttle so that the piston or diaphram in the d/v sees possetive boost when accelerating. And will not see vacuum when decelerating, this will ensure the d/v remains closed AT ALL TIMES, failure to do it in this fashion will result in boost leak and your car will run rich/retarded on boost.
The point at which it leaks will depend on the strength of your d/v spring and the volume of atmospheric pressure air you have trapped in the piston/diaphram side of the valve by "plugging it".
I hope this helps with the chatter
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