Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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My frickin dump valve!
No more turbo flutter slowly killing my turbo, no more dodgy on/off power delivery, no more motorway jerkiness
Z20 LETs DO NOT like dump valves
The end 
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BarnshaW
Member
Registered: 25th Oct 06
User status: Offline
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congratulations. A celebrationary drink are in order kind sir
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Ben G
Member
Registered: 12th Jan 07
Location: Essex
User status: Offline
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tttssssccccccchhhhhhhhhhhhhhh
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Toby
Premium Member
Registered: 29th Nov 05
User status: Offline
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how come it was on there?
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Whittie
Member
Registered: 11th Aug 06
Location: North Wales Drives: BMW, Corsa & Fiat
User status: Offline
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Because it makes cool sounds....
Brrrrrrrrrrrrummmmmmmmmmmm tischhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
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Wrighty
Member
Registered: 28th Feb 04
Location: Howden
User status: Offline
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poor little zLets 
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Marc
Member
Registered: 11th Aug 02
Location: York
User status: Offline
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Woo Hoo
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Robbo
Member
Registered: 6th Aug 02
Location: London
User status: Offline
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I think they sound fuckign great tbh 
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Rob B
Member
Registered: 8th Jan 04
Location: Area Motorsport Drives: Race EP3
User status: Offline
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Agreed, although mine is 60% recirc / 40% tshhh lol
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16V_1600
Member
Registered: 7th Oct 07
User status: Offline
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I used to love the Blitz I had on my MR2 
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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quote:
Originally posted by Robbo
I think they sound fuckign great tbh
So do i
But it was killing my turbo and making my car rubbish to drive!
SOunded ace on the calibra and the corsa, but astra sounded poop in comparison tbh
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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why are they so bad on z20let's and not c20let's?
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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to do with the AFM, position of the valve or something. To do with the ECU and unmetered air.
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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yeh that's why you need the twin piston type on the c20let but won't it be the same on a z20let as they both have afm's?
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c20let
Member
Registered: 25th Jun 05
Location: Aberdeenshire Drives: VXR Astravan,Evo 9GT,mr2 tbo
User status: Offline
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i HATE dump valves but for some reason quite like the one on my mr2.
the one on my corsa used to do my head in
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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quote:
Originally posted by sri power
yeh that's why you need the twin piston type on the c20let but won't it be the same on a z20let as they both have afm's?
totally different design, i dont know the technicalities im afraid, it just doesnt work. Mainly IMO the throttle responses are all to cock. Plus astra is electronic whereas c20lets etc are all cable driven.
twin piston is required on z20 as well, same valve as cally
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ScottBeck
Member
Registered: 7th Dec 06
Location: Hemel Hempstead, Hertfordshire
User status: Offline
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so what dump valves are twin piston? does it matter if there not ?
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JinThaMC
Member
Registered: 5th Aug 07
Location: P1 is 4db louder
User status: Offline
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all I know is you are a ugly cun1!
[Edited on 22-12-2007 by JinThaMC]
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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Mine was a DV26
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Rob B
Member
Registered: 8th Jan 04
Location: Area Motorsport Drives: Race EP3
User status: Offline
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I loved my dv26 on the punto
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Robbo
Member
Registered: 6th Aug 02
Location: London
User status: Offline
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quote:
Originally posted by Jambo
quote:
Originally posted by Robbo
I think they sound fuckign great tbh
So do i
But it was killing my turbo and making my car rubbish to drive!
SOunded ace on the calibra and the corsa, but astra sounded poop in comparison tbh
Yeah that fair enough
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craig_s
Member
Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
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mine is also a dv26
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RobHayes
Member
Registered: 6th Sep 03
Location: Lincolnshire
User status: Offline
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from what i've read, it depends on where you connect the vacuum line to open the valve. it needs to be a genuine vacuum source (suggested is fuel pressure regulator)
z20let and z16ler utilise a solenoid controlled vacuum box, which is controlled by the ecu. this allows the ecu to control the boost pressure more effectively, and at times bleed off the boost pressure if it isnt needed. the runiong problems are caused when the ecu decides the boost pressure isnt needed (tootling along or whatever) and opens the standard dump valve via this vacuum box. the problem being if another dump valve is also fed off this same box, it will release all the incoming air from the intake and so causethe jerkiness etc
or something like that
http://www.courtenaysport.co.uk/index.php?act=viewDoc&docId=95
[Edited on 23-12-2007 by RobHayes]
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
User status: Offline
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trust me mine was plummed in correctly, to the FPR also tried many different setups. Its just not meant to be!
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carribicbaby
Banned
Registered: 12th Jun 07
Location: scotland
User status: Offline
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sounds wicked but if it dosnt work why bother putting up with it jerking and killing your turbo!!!
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