BarryAstra
Member
Registered: 12th Feb 01
Location: Glasgow, Scotland
User status: Offline
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A mate of mine has just bought a Mk4 GSi...doesnt know much about the tuning etc and neither do I
anyway he wants an induction kit and a dump valve
best options please... 
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big eck
Member
Registered: 20th Apr 03
Location: Tullibody. Drives - Audi B8 S4 & Fiesta Zetec-S
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Regal offer good tuning stuff for the mk4 gsi
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Teddy
Member
Registered: 19th Jul 04
Location: Northampton Drives: VW Bora 1.9TDi pd130
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Dont touch Regal in my experience - never get the goods you pay for.
Speak to Courtenay that will sort you out.
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Patrick
Member
Registered: 25th Apr 02
Location: SE London
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Hello mate, best option with the z20let is the standard dump valve mate. A lot of people with this engine have gone for an aftermarket version and have had nothing but problems, most common being a loss in power and occasionally AMM problems. Best Induction kit for the z20let is thought to be the CDA carbon induction system, heard nothing but praise about these. I'm getting one very soon. Keep clear from Pipercross especially the Viper, may look cool but again has been known to affect the AMM.
Tuning wise, Regal and Courtenay offer generic maps which they can download onto your ECU in 3 stages.
My advice would be to talk to AmD Technik. They really know there stuff and offer a custom map for the z20let. I have had this done and my car now runs 240bhp and 270lb/ft.
If you want more info, log onto www.astra-sport.co.uk as there are a lot of people clued up on there when it comes to Astra Turbo's. There is also a website www.zlet.co.uk which is specifically for Vauxhall cars with the z20let engine and you may find that very informative.
Hope I've helped. 
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Scrappy Doo
Banned
Registered: 18th Aug 04
User status: Offline
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As patrick says, the oe valve is more than upto the job. A VTA will only fool the ecu into throwing more fuel into the car which long term can cause problems.
Same again with the induction kit, ideally the standard airbox is best. Although if you can provide suffcient shielding for an induction kit it should be ok.
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StuartVRS
Member
Registered: 9th Feb 03
Location: Bromley Common, Greater London
User status: Offline
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quote:
Originally posted by Patrick
My advice would be to talk to AmD Technik.
My advice would be to check those figures you have and steer well clear of AmD
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BarryAstra
Member
Registered: 12th Feb 01
Location: Glasgow, Scotland
User status: Offline
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this is probably gonna kill this post but i think he's probably just looking for the noise that an aftermarket dump valve will give....or can this be achieved from the standard one?
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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Cone and the standard DV is louder.
There are a lot of people with bad experience of all the big names though, as you can possibly tell.
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Scrappy Doo
Banned
Registered: 18th Aug 04
User status: Offline
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If you fit an aftermarket air filter, weather it be panel or cone you will begin to hear the oe valve.
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vibrio
Banned
Registered: 28th Feb 01
Location: POAH
User status: Offline
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quote:
Originally posted by BarryAstra
this is probably gonna kill this post but i think he's probably just looking for the noise that an aftermarket dump valve will give....or can this be achieved from the standard one?
your friend is obviously barry 
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BarryAstra
Member
Registered: 12th Feb 01
Location: Glasgow, Scotland
User status: Offline
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quote:
Originally posted by vibrio
quote:
Originally posted by BarryAstra
this is probably gonna kill this post but i think he's probably just looking for the noise that an aftermarket dump valve will give....or can this be achieved from the standard one?
your friend is obviously barry
obviously its not because i dont have an mk4 Astra GSi 
fanny!
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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quote:
Originally posted by Patrick
[color=Navy]Hello mate, best option with the z20let is the standard dump valve mate. A lot of people with this engine have gone for an aftermarket version and have had nothing but problems, most common being a loss in power and occasionally AMM problems. Best Induction kit for the z20let is thought to be the CDA carbon induction system, heard nothing but praise about these. I'm getting one very soon. Keep clear from Pipercross especially the Viper, may look cool but again has been known to affect the AMM.
Has it affected the Z20LET in the Astra / Zafira? How is the BMC CDA ANY different in how it flows air? They're both foam, both sealed unit, both with a fixed cold air feed - the only Z20LET I know of that has a problem with ANY induction kit is the VX220T where the air mass meter simply burns itself out - which also happens with the STANDARD airbox in some circumstances (it's been known to get too wet).
Do BMC do a tailored fitment for the Z20LET or is it just another bodged "universal" fitment?
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bazgooch
Member
Registered: 25th Mar 01
Location: Bracknell
User status: Offline
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quote:
Originally posted by Joff
quote:
Originally posted by Patrick
[color=Navy]Hello mate, best option with the z20let is the standard dump valve mate. A lot of people with this engine have gone for an aftermarket version and have had nothing but problems, most common being a loss in power and occasionally AMM problems. Best Induction kit for the z20let is thought to be the CDA carbon induction system, heard nothing but praise about these. I'm getting one very soon. Keep clear from Pipercross especially the Viper, may look cool but again has been known to affect the AMM.
Has it affected the Z20LET in the Astra / Zafira? How is the BMC CDA ANY different in how it flows air? They're both foam, both sealed unit, both with a fixed cold air feed - the only Z20LET I know of that has a problem with ANY induction kit is the VX220T where the air mass meter simply burns itself out - which also happens with the STANDARD airbox in some circumstances (it's been known to get too wet).
Do BMC do a tailored fitment for the Z20LET or is it just another bodged "universal" fitment?
the length of the CDA makes it a pain in the arse to run a decent cold air feed as well
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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quote:
Originally posted by bazgooch
quote:
Originally posted by Joff
quote:
Originally posted by Patrick
[color=Navy]Hello mate, best option with the z20let is the standard dump valve mate. A lot of people with this engine have gone for an aftermarket version and have had nothing but problems, most common being a loss in power and occasionally AMM problems. Best Induction kit for the z20let is thought to be the CDA carbon induction system, heard nothing but praise about these. I'm getting one very soon. Keep clear from Pipercross especially the Viper, may look cool but again has been known to affect the AMM.
Has it affected the Z20LET in the Astra / Zafira? How is the BMC CDA ANY different in how it flows air? They're both foam, both sealed unit, both with a fixed cold air feed - the only Z20LET I know of that has a problem with ANY induction kit is the VX220T where the air mass meter simply burns itself out - which also happens with the STANDARD airbox in some circumstances (it's been known to get too wet).
Do BMC do a tailored fitment for the Z20LET or is it just another bodged "universal" fitment?
the length of the CDA makes it a pain in the arse to run a decent cold air feed as well
Gawd I love you bazwell MWAH x
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MatG
Member
Registered: 26th Apr 02
Location: Birmingham UK
User status: Offline
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The BMC CDA has shown better performance over any other filters in the past on our RR days. That is the only reason it is used more often than not.
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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What size inlet does the CDA have? We could always increase the size on the Viper from 75mm to 100mm
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vibrio
Banned
Registered: 28th Feb 01
Location: POAH
User status: Offline
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quote:
Originally posted by Joff
quote:
Originally posted by Patrick
[color=Navy]Hello mate, best option with the z20let is the standard dump valve mate. A lot of people with this engine have gone for an aftermarket version and have had nothing but problems, most common being a loss in power and occasionally AMM problems. Best Induction kit for the z20let is thought to be the CDA carbon induction system, heard nothing but praise about these. I'm getting one very soon. Keep clear from Pipercross especially the Viper, may look cool but again has been known to affect the AMM.
Has it affected the Z20LET in the Astra / Zafira? How is the BMC CDA ANY different in how it flows air? They're both foam, both sealed unit, both with a fixed cold air feed - the only Z20LET I know of that has a problem with ANY induction kit is the VX220T where the air mass meter simply burns itself out - which also happens with the STANDARD airbox in some circumstances (it's been known to get too wet).
Do BMC do a tailored fitment for the Z20LET or is it just another bodged "universal" fitment?
the BMC is cotton gauze Mr Joff
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vibrio
Banned
Registered: 28th Feb 01
Location: POAH
User status: Offline
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quote:
Originally posted by MatG
The BMC CDA has shown better performance over any other filters in the past on our RR days. That is the only reason it is used more often than not.
enclosed filtes on turbo cars are a silly thing
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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quote:
Originally posted by corsaCsxi
quote:
Originally posted by Patrick
My advice would be to talk to AmD Technik.
My advice would be to check those figures you have and steer well clear of AmD
pat still likes to talk the shite
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Patrick
Member
Registered: 25th Apr 02
Location: SE London
User status: Offline
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Okay, whatever.
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Ditch
Member
Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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AND I WAS LIKE....... WHATEVER!!!!!
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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quote:
Originally posted by vibrio
quote:
Originally posted by Joff
quote:
Originally posted by Patrick
[color=Navy]Hello mate, best option with the z20let is the standard dump valve mate. A lot of people with this engine have gone for an aftermarket version and have had nothing but problems, most common being a loss in power and occasionally AMM problems. Best Induction kit for the z20let is thought to be the CDA carbon induction system, heard nothing but praise about these. I'm getting one very soon. Keep clear from Pipercross especially the Viper, may look cool but again has been known to affect the AMM.
Has it affected the Z20LET in the Astra / Zafira? How is the BMC CDA ANY different in how it flows air? They're both foam, both sealed unit, both with a fixed cold air feed - the only Z20LET I know of that has a problem with ANY induction kit is the VX220T where the air mass meter simply burns itself out - which also happens with the STANDARD airbox in some circumstances (it's been known to get too wet).
Do BMC do a tailored fitment for the Z20LET or is it just another bodged "universal" fitment?
the BMC is cotton gauze Mr Joff
I have never seen inside - I assumed the gains reported were good because it was a foam filter - my bad 
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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quote:
Originally posted by Patrick
...Keep clear from Pipercross especially the Viper, may look cool but again has been known to affect the AMM.
...
My advice would be to talk to AmD Technik. They really know there stuff...
Taken from AmD website
"Stage 2 - Full Rolling Road Remap, Milltek Full Stainless Steel Exhaust, PiperX induction kit. Includes fitting. 240bhp. Higher bhp is available as engine aiflow is maximised via the exhaust and intake. Remap is designed to optimise fuelling and boost to the increased airflow now available but still kept low due to the need of a chargecooler for reliability at higher levels."
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MatG
Member
Registered: 26th Apr 02
Location: Birmingham UK
User status: Offline
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Joff the Viper faired quite badly on some of the standard cars let alone the uprated spec cars. The BMC's are actually quite liked by the AmD boys and they have been impressed with the figures with cars runing them. I also have a Spanish car mag feature testing a lot of well known brands and the Viper was beaten (only just though!) by the BMC. At the end of the day its down to the car tested though.
I think Pipercross are a little behind though, I am certainly going to try and fit a BMC on my car but space could mean it impossible to do.
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Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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Agreed Matt - I'm tempted to see how the BMC flows air as they do seem to be doing something right, if I can get a unit we can run some tests off the car 
It might be a case that the neck size is too small on some applications which is a problem when you're making a "tailored" kit - if you sell it as universal, it's down to the customer to make it fit. If it's tailored then the onus is on the manufacturer to make a product that fits and fits well.
Nice to hear no-one likes K&N tho
The Viper Evo has always worked extremely well and it's biggest market is in Asia - just a shame it's physically too big to fit most cars over here
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