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Viewing Topic: Dumpvalve noise?

#90463
PostSat Sep 27, 2008 7:04 pm
RedRummy
Location:Hove
Drives: 1994 Mazda RX-7
Joined:13 Mar 2007
Posts:1149

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it all depends on what boost you're running too... you do get the chatter sometimes, and its not harmful - most noticeable on high boost single turbo cars... (speaking from the RX7 world anyway)
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#90466
PostSat Sep 27, 2008 7:20 pm
andybob
Location:Lymington
Drives:r33 gtst
Joined:05 Aug 2008
Posts:47

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ben_harmer32 wrote:
It chattered all the time. and the bolt on the back is done up as far as it goes


then the springs too weak you can buy hks springs which fit the fakes too tho hks has stopped making service kits because of people like me which bought a fake and the service pack which has all the internal bits (seals springs washers etc) from the real thing basically making them no different just a 1/4 of the price
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#90467
PostSat Sep 27, 2008 7:40 pm
ben_harmer32
SJC Member
Location:Horsham, West Sussex
Drives: 1995 Toyota Celica GT4
Joined:21 Sep 2006
Posts:523

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Which vacuum line should i have used? Would that make a difference? I used the one that the standard bov uses (two pipes that come out the top lead to)


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#90468
PostSat Sep 27, 2008 7:45 pm
Andy_Boy
SJC Member
Location:Worthing
Drives: 1996 Nissan Skyline R33 GTS25t
Joined:25 Jan 2007
Posts:453

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if its dun up all the way the spring is at its tightest which would take alot of pressure for it to open and the pipe that runs to it should go between the turbo and throttle
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#90469
PostSat Sep 27, 2008 9:03 pm
SCOOBYDOO
SJC Member
Location:Somewhere
Drives: 2002 Honda Civic
Joined:28 Oct 2006
Posts:751

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just buy a proper one = no hassle then and you wont be driving around with fake parts Smile
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#90470
PostSat Sep 27, 2008 10:08 pm
Administrator AdamR
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Location:Brighton
Drives: 1993 Subaru Impreza WRX
Joined:25 Jul 2006
Posts:5890

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buy once, buy right Thumbs Up!


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#90480
PostSun Sep 28, 2008 2:37 pm
Camera Bob
Location:Brighton
Drives: 1988 Toyota Celica GT4
Joined:24 Sep 2006
Posts:1139

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na Ben don't listen to them..... have you fitted a fmic yet?
Ive had 8,ooo miles out of mine with no dump-valve at all running 1.1 bar... sounds the nuts as it stall and a compressor surge rushes out of the inlet side,.. then the waste gate chatters like buggery... I've recently removed the turbo (ct20b) and there is no visible ware on waste gate, inducer and exducer blades or thrust bearing's...

I think its personnel choice... If you fiddle with the dump valve I'm sure you can get it to work. take it off and see if you can make the piston move easily,... fiddle with the spring settings till it feels moderately difficult to move... then re fit it and go for a blatt... see what happens....

At the end of the day its just a toy innit Twisted Evil

a turbos 300 ish and new big ends 150 ish including bits ... have fun and keep an eye on turbo ware....


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#90493
PostSun Sep 28, 2008 5:34 pm
ben_harmer32
SJC Member
Location:Horsham, West Sussex
Drives: 1995 Toyota Celica GT4
Joined:21 Sep 2006
Posts:523

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I've given up for the moment. Only fitted it as it was free! Think i'll get a proper one. There's a forge Motorsport one for £30 on GT4oc might go for that. Cheers for the help guy's Thumbs Up!


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#90495
PostSun Sep 28, 2008 6:13 pm
Stu C
Location:West Sussex
Drives: 1994 Nissan Skyline R33 GTS25t
Joined:06 Sep 2006
Posts:1963

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The bolt at the back should be wound out not in? It controls the amount of vacuum you let in to open the valve when the throttle is closed...


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#90497
PostSun Sep 28, 2008 9:42 pm
speedmachine
Location:West Sussex
Drives:MR2 turbo
Joined:20 Mar 2007
Posts:262

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A lot of people with 200sx run the car without the dump valve to ge the pigeon noise. Apparently is doesnt cause the turbo problems unless you are running increased boost. Personally I'd still rather have the vta bov. Keep an eye out for a used SARD R2D2. I had one on my old car and preffered the sound to the KS one
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#90499
PostSun Sep 28, 2008 10:12 pm
Anger
Location:Surrey
Drives: 1999 Subaru Impreza
Joined:30 Jul 2006
Posts:1048

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Mine chatters all the time and i love it Mr. Green


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#90548
PostTue Sep 30, 2008 9:04 pm
richgt4
Location:Balcombe, West Sussex
Drives:Used to drive a ST205GT4. Now a N/A MR2, CBR600 & TZRR Belgrada
Joined:15 Sep 2006
Posts:281

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I had a genuine HKSSQ D/V on my GT4 & it chirped rather than made a pssssstttt sound. I had the car for 3 years, running standard boost & the D/V was on it when it was in Japan & I never had any problems at all.

I think the HKSSQ D/V are meant to sound like that. Sounds more like a WRC rally car IMHO Thumbs Up! Twisted Evil

Rich


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#90569
PostWed Oct 01, 2008 8:41 pm
R11CH
SJC Member
Location:Here & There !
Drives:JDM Magic Carpet
Joined:16 Dec 2007
Posts:201

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As Stu C said wind the bolt out and it should work Thumbs Up!


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#90579
PostThu Oct 02, 2008 3:20 pm
ben_harmer32
SJC Member
Location:Horsham, West Sussex
Drives: 1995 Toyota Celica GT4
Joined:21 Sep 2006
Posts:523

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re-fitted it wound the bolt almost right out and still chatters lol I give up Rolling Eyes


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#90621
PostSat Oct 04, 2008 3:32 pm
ben_harmer32
SJC Member
Location:Horsham, West Sussex
Drives: 1995 Toyota Celica GT4
Joined:21 Sep 2006
Posts:523

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did some reading on GT4OC and found out how to turn the standard recric valve into a vent to atmosphere (really easy) and sounds good! Job done for now Very Happy


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