dump valve or no dump valve
11-04-2009, 12:01 AM
#42
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Recirc i would say simply because you aint wasting any air.
My tuppence is the OP wont need one on a cvh at 20psi after the setup and i reckon you'll find it i wee bit nicer without it.
Sooner or later it will do your nut in mate.
My tuppence is the OP wont need one on a cvh at 20psi after the setup and i reckon you'll find it i wee bit nicer without it.
Sooner or later it will do your nut in mate.
11-04-2009, 12:06 AM
#43
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Well I will vote chatter cos no one's voted it as being gay at the minute and if you have a dump valve your gay and if you don't have one your gay, so its all confusing here... middle of the road... I say..... middle of the road..... which could result in a bang....
11-04-2009, 12:06 AM
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11-04-2009, 12:29 AM
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they say it shortens the life of the turbo what it does is knackers the fins on the turbo over time, like they say depending on how much boost ur runnin. they sound good with them or without them.
11-04-2009, 12:55 AM
#46
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The way most rs turbo's get treated its usually fucked seals or oil starvation that does them in way before the blades get it from backed up charge air (which gives you the fluttering noise btw) .
11-04-2009, 09:00 AM
#47
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Last edited by Ad4m RST; 11-04-2009 at 09:19 AM.
11-04-2009, 10:01 AM
#50
My 2 pence worth.............
Bottom line is it prevents the turbo from stalling and so decreases spool up time (lag) when you next plant your foot, whether it's by a millisecond or 10 seconds... less lag is still less lag, IMO that is all that matters!
Bottom line is it prevents the turbo from stalling and so decreases spool up time (lag) when you next plant your foot, whether it's by a millisecond or 10 seconds... less lag is still less lag, IMO that is all that matters!
11-04-2009, 10:35 AM
#51
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i have a s2 mfi at 190bhp @15psi and o dump valve i only hear slight chatter! im getting the boost upped at totd soon to 20psi, will this have an effect on the noise?
11-04-2009, 02:05 PM
#52
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This is turning out to be a good debate is there any tuners out there willing to post comments
my dump valve is still on but i think i will try it without and see how it goes
keep the coments coming guys and galls
my dump valve is still on but i think i will try it without and see how it goes
keep the coments coming guys and galls
11-04-2009, 02:17 PM
#53
often i fine the car feels more laggy with the dump valve 
the idea of a dump valve is to protect the turbo, in some cases the force of the air going back through the turbo when the throttle is closed can cause damage to the comp wheel or stalling the turbo causing the nose nut to come off.
i don't normally run a dude valve, 34psi on my escort was no problems with out one, but some turbo's can take it, some can't.
the idea of a dump valve is to protect the turbo, in some cases the force of the air going back through the turbo when the throttle is closed can cause damage to the comp wheel or stalling the turbo causing the nose nut to come off.
i don't normally run a dude valve, 34psi on my escort was no problems with out one, but some turbo's can take it, some can't.
Last edited by GUZZLER; 11-04-2009 at 02:21 PM.
11-04-2009, 02:23 PM
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11-04-2009, 02:31 PM
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like my engine doesnt start boosting until 3800rpm so your relying on the na side of you engine to get the turbo up to speed
11-04-2009, 02:36 PM
#56
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Guzzler, i think the "lag" you feel has more to do with the dump valve relieving the pressure from the inlet to the plenum, so when you get back on the throttle the turbo has to repressurize the system again. so theoretically yes you just saved a nano second of spool up time but you just wasted an inlet full of charge.
One last thing, when a compressor wheel stalls by definition it is now at 0 RPM, no noise is made.
the compressor still has to rotate against the flow of the air coming back through it to make the chattering noise.
11-04-2009, 03:12 PM
#58
well you state that the turbo has stalled which means that it has come to a stop so why would that cause lag when every turbo has to reach certain rpm to start the point of boosting up!
like my engine doesnt start boosting until 3800rpm so your relying on the na side of you engine to get the turbo up to speed
like my engine doesnt start boosting until 3800rpm so your relying on the na side of you engine to get the turbo up to speed
So if you stall it then your adding to the spool up time (lag) as it wasnt stopped before!
But.........
Guzzler, i think the "lag" you feel has more to do with the dump valve relieving the pressure from the inlet to the plenum, so when you get back on the throttle the turbo has to repressurize the system again. so theoretically yes you just saved a nano second of spool up time but you just wasted an inlet full of charge.
11-04-2009, 03:20 PM
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11-04-2009, 03:32 PM
#60
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Karlos i honestly don't know mate, it would be good if a tuner could give us a comment on it though
I wonder at what point as you increase boost pressure that this really comes into play too, i mean would you see any odds on a typical t3 @ say 14 - 20 psi type setup?
I wonder at what point as you increase boost pressure that this really comes into play too, i mean would you see any odds on a typical t3 @ say 14 - 20 psi type setup?
Last edited by PeterD; 11-04-2009 at 03:34 PM.
11-04-2009, 03:35 PM
#61
TBH I think it's probably nothing realistically noticable or meassurable for 99% of us, but an interesting thought none the less! 
I peek at 17psi and get chatter with a dump valve fitted so clearly inspite of the DV pressure is still backing up and hitting the compressor blades (might even be stalling who knows?), so am I benefitting from that DV? Is it protecting the turbo? Am I loosing charge pressure and getting more lag? Am i spoolig up faster than if it wasnt there? Am I somewhere in the middle?? lol
It's dumping some pressure but obviously not all!
What i'd need to do is a back to back RR test and look at what RPM i make peek boost with the DV, and then without the DV, to know 100% what benefits my setup!
I think the same will apply to everyone's individual setup too!
Which in reality means......... if you like the way your car drives with a DV, keep it! If you like the way your cars drives without a DV, lose it!
I peek at 17psi and get chatter with a dump valve fitted so clearly inspite of the DV pressure is still backing up and hitting the compressor blades (might even be stalling who knows?), so am I benefitting from that DV? Is it protecting the turbo? Am I loosing charge pressure and getting more lag? Am i spoolig up faster than if it wasnt there? Am I somewhere in the middle?? lol
It's dumping some pressure but obviously not all!
What i'd need to do is a back to back RR test and look at what RPM i make peek boost with the DV, and then without the DV, to know 100% what benefits my setup!
I think the same will apply to everyone's individual setup too!
Which in reality means......... if you like the way your car drives with a DV, keep it! If you like the way your cars drives without a DV, lose it!
Last edited by Karlos G; 11-04-2009 at 03:45 PM.
11-04-2009, 03:36 PM
#62
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when i took the d.v. off my 200sx it felt much much more smoother, inbetween gear changes no throwing heads forwards and backwards and was more responsive between gear changes when flat out? funny that as people always say d.v.s help for better response between changes!
also agree with the best noise a d.v. can make
11-04-2009, 04:01 PM
#63
where's that bloke frem redline ready and waiting to put a plug in for the mag this month WITH THE DV or NO DV FEATURE in it
the resluts are surprisingly surprising, although they do say that they may be different on another car from the one they tested
i ran with twin dv's on the tt due to it needing one per bank and found that with the dv in place it was much more responsive
although this is probably more in my mind that noticable by figures on a blast
the resluts are surprisingly surprising, although they do say that they may be different on another car from the one they tested
i ran with twin dv's on the tt due to it needing one per bank and found that with the dv in place it was much more responsive
although this is probably more in my mind that noticable by figures on a blast
12-04-2009, 09:59 PM
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12-04-2009, 11:14 PM
#67
I personally feel that my car feels sharper through the gears and is smoother with a dump valve fitted.
I also dont care what people think about whether they are 'gay or not', If it improves the way the car performs and drives then I'm all for it, my car is noisy as fuck anyway so another noise doesn't really bother me.
I also dont care what people think about whether they are 'gay or not', If it improves the way the car performs and drives then I'm all for it, my car is noisy as fuck anyway so another noise doesn't really bother me.
13-04-2009, 06:53 AM
#68
Because when changing gear the turbo does not come to a full stop (unless your granny shifting! lol), TBH I think it is very rarely at full stop as there is always exhaust gasses passing through unless the waste gate is completely shut!
So if you stall it then your adding to the spool up time (lag) as it wasnt stopped before!
But.........
....... that is a really interesting point! I wonder what is favourable, retained inlet pressure vs reduced spool up time?
So if you stall it then your adding to the spool up time (lag) as it wasnt stopped before!
But.........
....... that is a really interesting point! I wonder what is favourable, retained inlet pressure vs reduced spool up time?
when the term 'stalling' is used it refers to the turbo not spinning for a split second, in effect the compressor wheel is a fan blowing air into the engine, when the throttle is shut on boost the air has no where to go so is forced back into the turbo, this back pressure on the fan can cause it to stop dead, ie; stall. With a dude valve the backpressure is released through the valve giving you the 'whoosh' noise rather than the sonic noise of the air goung back through the turbo!
as for wether its better to run a dump valve is car dependent
13-04-2009, 07:12 AM
#69
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im runnning a gt35 turbo at 32psi without a dump valve i will fook the turbo up in no time. i hate the sound of dump valve so im going recirculating type as its the only option i have.
13-04-2009, 08:00 AM
#70
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No Dv on an RST no questions. I've not run one since mine was built about 5 years ago and despite 25psi of boost it's not even shown a smidge of wear or damage.
Do miss the chatter on my old FRST though
http://www.youtube.com/watch?v=baUEB...e=channel_page
http://www.youtube.com/watch?v=ts6_Z...e=channel_page
Do miss the chatter on my old FRST though
http://www.youtube.com/watch?v=baUEB...e=channel_page
http://www.youtube.com/watch?v=ts6_Z...e=channel_page
13-04-2009, 08:05 AM
#71
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Heh interesting how this forum is so hard rice-against but at the same time you are having an argument if dump valves sound gay or not.
It still has it's purpose. Chatter sounds very good but I think that a "simple" dump valve can sound nice too, as long as it's a simple woosh instead of those with the friggin whistle on it making it all scweaky or similar.
Neither of them is gay.
It still has it's purpose. Chatter sounds very good but I think that a "simple" dump valve can sound nice too, as long as it's a simple woosh instead of those with the friggin whistle on it making it all scweaky or similar.
Neither of them is gay.
13-04-2009, 10:42 AM
#72
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still no tuners comments come on guys what are your views on the big debate
no one will be on your case saying you owe them a turbo because you said it was ok in this thread lol
lee
no one will be on your case saying you owe them a turbo because you said it was ok in this thread lol
lee
13-04-2009, 12:56 PM
#73
vvvvvvvvvvvvvvvvvvvvvvvvvvvvv
where's that bloke frem redline ready and waiting to put a plug in for the mag this month WITH THE DV or NO DV FEATURE in it
the resluts are surprisingly surprising, although they do say that they may be different on another car from the one they tested
i ran with twin dv's on the tt due to it needing one per bank and found that with the dv in place it was much more responsive
although this is probably more in my mind that noticable by figures on a blast
the resluts are surprisingly surprising, although they do say that they may be different on another car from the one they tested
i ran with twin dv's on the tt due to it needing one per bank and found that with the dv in place it was much more responsive
although this is probably more in my mind that noticable by figures on a blast
13-04-2009, 01:05 PM
#74
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13-04-2009, 03:20 PM
#75
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No Dv on an RST no questions. I've not run one since mine was built about 5 years ago and despite 25psi of boost it's not even shown a smidge of wear or damage.
Do miss the chatter on my old FRST though
http://www.youtube.com/watch?v=baUEB...e=channel_page
http://www.youtube.com/watch?v=ts6_Z...e=channel_page
Do miss the chatter on my old FRST though
http://www.youtube.com/watch?v=baUEB...e=channel_page
http://www.youtube.com/watch?v=ts6_Z...e=channel_page
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