Do Dump valves give any .....
09-03-2007, 07:47 AM
#1
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Do Dump valves give any .....
performance gains or advantages when fitted to a turbo engine? or are they just annoying and not worth the bother?
Just interested.
Craig.
Just interested.
Craig.
and if you like pssssssssstch then why not
09-03-2007, 08:05 AM
#5
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Topbombingkid
Its al down to what turbo your runing aparently the gt seies garretts need them, so i'm ging to have to use 1 which i'm not overly chuffed about.
On a erst though there wank and not needed as they d more harm than good imo
Its al down to what turbo your runing aparently the gt seies garretts need them, so i'm ging to have to use 1 which i'm not overly chuffed about.
On a erst though there wank and not needed as they d more harm than good imo
09-03-2007, 08:12 AM
#7
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I believe there are issues with the atmospheric dump valves causing idle problems and such like due to the ECU getting duff readings of some description, this was certainly the case on both my Scooby Doo and my Evo.
Personally I quite like "noises" zaust, dumping, chatter, gearbox whining etc. but then I don't drive my car everyday
my escos currently has very little in the way of noise polution, it even has a standard airbox, time for some tweaks I think 
Personally I quite like "noises" zaust, dumping, chatter, gearbox whining etc. but then I don't drive my car everyday
my escos currently has very little in the way of noise polution, it even has a standard airbox, time for some tweaks I think
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09-03-2007, 08:24 AM
#8
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its better for your turbo if you use one though as iirc wastegate chatter is the air forcing back thru the turbo in the wrong direction..... sou nds good though
Sarah
Sarah
09-03-2007, 08:46 AM
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I find that the car is slightly (not much but enough to be noticeable!) more responsive with the chatter... but i like my dump valve noise! so i change it over every few months!
09-03-2007, 08:49 AM
#13
DEYTUKURJERBS
they on standard cars as a noise suppresion device and it will very very very slightly increase turbo life.
the "GT series needs one" thing is debatable, as i know of loads of people running GT series without them, maybe its just GT35+ that needs them as wheels are so big in comparison to the spindly lil centres.
the "GT series needs one" thing is debatable, as i know of loads of people running GT series without them, maybe its just GT35+ that needs them as wheels are so big in comparison to the spindly lil centres.
09-03-2007, 08:59 AM
#16
DEYTUKURJERBS
Ive seen road legal competition/track cars running GT30 sized turbos (well, pushing 450-500 horse and 1.5bar+, so about that) running with no water cooling and no DV and no ill effects, so its a strange thing really.
26-04-2007, 09:56 PM
#17
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I heard that they are only needed with big turbos and that they actually sap power and response on a small turbo car.
I also heard that when the dump valve breaks they will allow excess boost and can knacker the turbo.
I've still got mine connected though.
I also heard that when the dump valve breaks they will allow excess boost and can knacker the turbo.
I've still got mine connected though.
27-04-2007, 08:59 AM
#19
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The only way a dump valve of any sort can sap power is by being open in the dump position which you would hear.
The only way to lose power is by losing boost, a dump valve does not allow excess boost if it breaks and it is a diaphragm one it leaks and LOOSES boost, if it piston type it will cause or try to cause turbo stall, which of course is an extra strain on life of turbo.
I have all three, recirc, atmo and none(chatter)
tabetha
The only way to lose power is by losing boost, a dump valve does not allow excess boost if it breaks and it is a diaphragm one it leaks and LOOSES boost, if it piston type it will cause or try to cause turbo stall, which of course is an extra strain on life of turbo.
I have all three, recirc, atmo and none(chatter)
tabetha
27-04-2007, 11:44 AM
#21
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Chatter is bad for a turbo in the long run, largely influenced by the size of the turbo though and how much boost is being run.
theres a VERY interesting thread in the technical essay archive on the subject, written by the man himself, Stu
theres a VERY interesting thread in the technical essay archive on the subject, written by the man himself, Stu
27-04-2007, 11:49 AM
#22
DEYTUKURJERBS
On most cars/engines your turbo/engine will fail for other reasons WAY before chatter fucks it.
Hence why most fuck it off.
Can give it all the theory people like, but enough people have tried to give results.
And you damn well CANT hear em when driving when they leaking slightly, which is common enough, from them slightly lifting from their seat at full boost etc etc.
And overspeeding a turbo like that will do will fuck a turbo a whole lot sooner.
Hence why most fuck it off.
Can give it all the theory people like, but enough people have tried to give results.
And you damn well CANT hear em when driving when they leaking slightly, which is common enough, from them slightly lifting from their seat at full boost etc etc.
And overspeeding a turbo like that will do will fuck a turbo a whole lot sooner.
27-04-2007, 11:51 AM
#23
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Originally Posted by tabetha
The only way a dump valve of any sort can sap power is by being open in the dump position which you would hear.
When you backed off for a second it dumped all the air btween the turbo and throttle body, if you came back on throttle quickly after that you had to wait for it to build up that boost again, was a pain in the arse.
Also found it jerky on the motorway, as I use throttle control to regulate my speed rather than braking all the time, and it was dumping just at the point of backing off so it was like being on a cake walk
27-04-2007, 12:26 PM
#25
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Originally Posted by Stavros
Ive seen road legal competition/track cars running GT30 sized turbos (well, pushing 450-500 horse and 1.5bar+, so about that) running with no water cooling and no DV and no ill effects, so its a strange thing really.
27-04-2007, 12:27 PM
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Originally Posted by RichardPON
Would ALWAYS have some sort of valve, re-circ or otherwise on something like my MR2.
Shonky Jap ceramic turbos...
Shonky Jap ceramic turbos...
and there was no loss in performance either
27-04-2007, 12:44 PM
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Originally Posted by Matt J
Can you adjust Re-circ valves so that it only does it at a preset boost level?
I know you can adjust dump valve springs to do the above, are re-circ's the same?
I know you can adjust dump valve springs to do the above, are re-circ's the same?
27-04-2007, 12:47 PM
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Originally Posted by S2martin
Originally Posted by RichardPON
Would ALWAYS have some sort of valve, re-circ or otherwise on something like my MR2.
Shonky Jap ceramic turbos...
Shonky Jap ceramic turbos...
However, those turbos aren't known for their strength, but they never run huge boost either.
MR2 lot tend to think that 1.2 bar is massive boost!
27-04-2007, 12:58 PM
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Originally Posted by RichardPON
Originally Posted by S2martin
Originally Posted by RichardPON
Would ALWAYS have some sort of valve, re-circ or otherwise on something like my MR2.
Shonky Jap ceramic turbos...
Shonky Jap ceramic turbos...
However, those turbos aren't known for their strength, but they never run huge boost either.
MR2 lot tend to think that 1.2 bar is massive boost!
Is the MR2 not used for modding as much as the other Jap stuff?
(sorry have no idea always had Ford blinkers
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27-04-2007, 01:28 PM
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Turbo is only really any good on mine for 1.1 bar tops, but it has an AFM setup, similar to a small turbo Esc Cos.
Later cars have more scope for tuning, and there are a couple of high 10 second cars in the UK.
Later cars have more scope for tuning, and there are a couple of high 10 second cars in the UK.
27-04-2007, 01:44 PM
#34
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Originally Posted by Stavros
the "GT series needs one" thing is debatable, as i know of loads of people running GT series without them, maybe its just GT35+ that needs them as wheels are so big in comparison to the spindly lil centres.
27-04-2007, 01:52 PM
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Originally Posted by Lou Lou.
Originally Posted by Stavros
the "GT series needs one" thing is debatable, as i know of loads of people running GT series without them, maybe its just GT35+ that needs them as wheels are so big in comparison to the spindly lil centres.
All the 200SX boys take the re-circs off and they seem to run forever and day chattering, they run a GT28 i believe
27-04-2007, 02:33 PM
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Originally Posted by SafeChav
Originally Posted by Lou Lou.
Originally Posted by Stavros
the "GT series needs one" thing is debatable, as i know of loads of people running GT series without them, maybe its just GT35+ that needs them as wheels are so big in comparison to the spindly lil centres.
Do you think this is ok without a dump valve??
27-04-2007, 02:49 PM
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Originally Posted by SafeChav
Originally Posted by Lou Lou.
Originally Posted by Stavros
the "GT series needs one" thing is debatable, as i know of loads of people running GT series without them, maybe its just GT35+ that needs them as wheels are so big in comparison to the spindly lil centres.
All the 200SX boys take the re-circs off and they seem to run forever and day chattering, they run a GT28 i believe
S14 are a T28 as standard.
I blocked off my re-circ last night on my S14, Happy times!!
27-04-2007, 02:52 PM
#39
DEYTUKURJERBS
Originally Posted by lead_foot
Originally Posted by SafeChav
Originally Posted by Lou Lou.
Originally Posted by Stavros
the "GT series needs one" thing is debatable, as i know of loads of people running GT series without them, maybe its just GT35+ that needs them as wheels are so big in comparison to the spindly lil centres.
All the 200SX boys take the re-circs off and they seem to run forever and day chattering, they run a GT28 i believe
S14 are a T28 as standard.
I blocked off my re-circ last night on my S14, Happy times!!
