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Author Z20LET Tuning - Any tips?
stan_the_man
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Registered: 14th Feb 07
Location: Perth, Western Australia
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29th Oct 07 at 20:38   View User's Profile U2U Member Reply With Quote

My computer illiterate mate has bought an Astra GSi turbo (MK4 shape) and is looking to have a slight play with it.

It will be used for mainly road use and the odd day at Crail 1/4 mile.

He has talked about a VXR turbo upgrade but im slighty dubious.

Tanks
cunningham
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Registered: 25th May 05
Location: Lochore, Fife
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29th Oct 07 at 20:47   View User's Profile U2U Member Reply With Quote

courtenay or regal for ideas but would personally get or do most of the stuff yourself if you can

my mates got a vxr turbo fitted as his standard one was fucked was cheaper than buying that standard turbo
Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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29th Oct 07 at 21:05   View User's Profile U2U Member Reply With Quote

VXR turbo is only about 600 IIRC. That and a map (so im led to beleive) is aroun d 270 as long as your exhaust fuelling and injectors etc are up to the job. Oh and a larger SMIC or FMIC is needed.

If nobody has warned him yet, dont even bother with a dumpvalve.

As mentioned regal are good or get yourself onto www.astraownersclub.com



[Edited on 29-10-2007 by Jambo]
Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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29th Oct 07 at 21:08   View Garage View User's Profile U2U Member Reply With Quote

Regal have just released a tubular manifold which is flanged for Garret GT series turbos, but they say it's only for use with forged pistons and steel rods

VXR turbo and injectors is a good start, with a remap and some metal boost pipes.
Alex16v
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Registered: 30th Jun 06
Location: Chester Drives: Civic ep3 final edition
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29th Oct 07 at 21:09   View User's Profile U2U Member Reply With Quote

My mate has just bought an astra mk4 SRi turbo, Z20LET, same as the astra GSi and is about to buy a bailey dump valve, why does he need to be warned mate? Do they mess up the engines?
Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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29th Oct 07 at 21:14   View User's Profile U2U Member Reply With Quote

In a word YES.

[Edited on 29-10-2007 by Jambo]
Alex16v
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Registered: 30th Jun 06
Location: Chester Drives: Civic ep3 final edition
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29th Oct 07 at 21:15   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Jambo
YEs. He can have mine for free


lol really? why whats the bad thing about them ?
MACKA
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Registered: 21st Oct 05
Location: Swindon, Wilts. Drives: Astra GSi & Corsa Sport
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29th Oct 07 at 21:15   View User's Profile U2U Member Reply With Quote

Depends how much he wants to spend. It's easy to get alot of power out of them.

As Jambo said, dump valves are not reccomended.
Alex16v
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Registered: 30th Jun 06
Location: Chester Drives: Civic ep3 final edition
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29th Oct 07 at 21:16   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by MACKA
Depends how much he wants to spend. It's easy to get alot of power out of them.

As Jambo said, dump valves are not reccomended.


Yeah but why? i can say to him not to get one but i need a reason. sounding a bit chav won't do it
Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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29th Oct 07 at 21:16   View User's Profile U2U Member Reply With Quote

damn your quick quoting

And no not for free i edited that incase you thought i was serious.


It messes with the AFM, the ECU and fucking everything.

Makes it jerky, and some people say it looses you power.

Mines coming off sharpish.
stan_the_man
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Registered: 14th Feb 07
Location: Perth, Western Australia
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29th Oct 07 at 21:17   View User's Profile U2U Member Reply With Quote

It seems to be the case on most new turbo engines that dump valves are a no-go.

Seems that de-restricting the air box and the vectra c inlet pipe is a good start on th ZLET.

Then a VXR turbo, Injectors and a re-map would be good.

Think hes in the process of finding an exhaust for it too....
Alex16v
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Registered: 30th Jun 06
Location: Chester Drives: Civic ep3 final edition
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29th Oct 07 at 21:18   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Jambo
damn your quick quoting

And no not for free i edited that incase you thought i was serious.


It messes with the AFM, the ECU and fucking everything.

Makes it jerky, and some people say it looses you power.

Mines coming off sharpish.


hehe dont worry i knew you were joking

Cheers! ill let him know!
MACKA
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Registered: 21st Oct 05
Location: Swindon, Wilts. Drives: Astra GSi & Corsa Sport
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29th Oct 07 at 21:19   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Alex16v
quote:
Originally posted by MACKA
Depends how much he wants to spend. It's easy to get alot of power out of them.

As Jambo said, dump valves are not reccomended.


Yeah but why? i can say to him not to get one but i need a reason. sounding a bit chav won't do it

If you really want to hear the turbo all you need is an induction kit/panel filter. It's quiet standard but a filter makes it louder. And you don't need a dump valve.
Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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29th Oct 07 at 21:20   View User's Profile U2U Member Reply With Quote

i have a sport cat, mongoose exhaust BMC air filter and a regal phase1 remap and im aprently making 238bhp and 270 l/b torque according to previous owner.

Alex16v
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Registered: 30th Jun 06
Location: Chester Drives: Civic ep3 final edition
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29th Oct 07 at 21:23   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by MACKA
quote:
Originally posted by Alex16v
quote:
Originally posted by MACKA
Depends how much he wants to spend. It's easy to get alot of power out of them.

As Jambo said, dump valves are not reccomended.


Yeah but why? i can say to him not to get one but i need a reason. sounding a bit chav won't do it

If you really want to hear the turbo all you need is an induction kit/panel filter. It's quiet standard but a filter makes it louder. And you don't need a dump valve.


Yeah i was just finding out why it is a bad idea for the sump valve really, seems it messes with the cars ecu and makes it run poorly.

Ill let him know about the filter and all of the upgrades in this thread!
MACKA
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Registered: 21st Oct 05
Location: Swindon, Wilts. Drives: Astra GSi & Corsa Sport
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29th Oct 07 at 21:23   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Jambo
i have a sport cat, mongoose exhaust BMC air filter and a regal phase1 remap and im aprently making 238bhp and 270 l/b torque according to previous owner.



But Jambo you have a bigger intercooler so I think you have Stage 2 tune don't you?
MACKA
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Registered: 21st Oct 05
Location: Swindon, Wilts. Drives: Astra GSi & Corsa Sport
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29th Oct 07 at 21:32   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by stan_the_man
It seems to be the case on most new turbo engines that dump valves are a no-go.

Seems that de-restricting the air box and the vectra c inlet pipe is a good start on th ZLET.

Then a VXR turbo, Injectors and a re-map would be good.

Think hes in the process of finding an exhaust for it too....


De-Restricting the airbox with a panel filter is a good start.

Pre-Cat is also very restrictive so replacing that releases power.

From what i've read Miltek are good exhausts for the GSi.
phil_sutton
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Registered: 8th Sep 07
Location: Nottingham
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29th Oct 07 at 22:01   View User's Profile U2U Member Reply With Quote

Nitrous?
Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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29th Oct 07 at 22:08   View User's Profile U2U Member Reply With Quote

oh yeah forgot ive got a big SMIC.

Its not phase 2, its a regal phase 1 remap.
Jambo
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Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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29th Oct 07 at 22:22   View User's Profile U2U Member Reply With Quote

my engine bay:

Fad
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Registered: 1st Feb 01
Location: Dartford Kent Drives: 330cd
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29th Oct 07 at 23:24   View User's Profile U2U Member Reply With Quote

For some reason z20LETS make insane torque with maps and clutches cannot cope and a consequence is poor standing quarters and traction particularly in the wet. My friends Phase 3.5 was insane in the wet to the point he had to get the switch to turn it off when ever it was damp.

If i was to go down the tuning the Z20let route i'd have:

2.2 airbox and pannel filter
Uprated FMIC
51mm silicone hoses
VXR turbo (although its not extemely different to stock just can be had cheaper for around 350-400 notes with all the fittings)
Precat pipe
sports cat
full stainless system
Prolly got for a generic map such as a CS2 as its the half way house to good power and manageable tractabilitly making it quicker than the big bhp cars.



[Edited on 29-10-2007 by Fad]
Rick Draper
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Registered: 10th Feb 01
Location: Cheshire
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29th Oct 07 at 23:30   View User's Profile U2U Member Reply With Quote

Speak to beardy about one of these, i know its on a corsa c but its bang on the money and it will i recon go straight on a astra:

7 omm
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Registered: 19th Nov 05
Location: Newcastle Upon Tyne
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30th Oct 07 at 11:08   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Jambo
damn your quick quoting

And no not for free i edited that incase you thought i was serious.


It messes with the AFM, the ECU and fucking everything.

Makes it jerky, and some people say it looses you power.

Mines coming off sharpish.


mine seems fine?...

is that where steven's manifold came from?...

 
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