View Full Version : Astra mk4 gsi turbo
Hi all just wondering what's my best moves and looking for other opinions I've had me gsi turbo a few months now love the car turbo is getting a little smokey so a vxr unit will be on the cards soon so really just wondering what's the first and best moves to make for some more horses dont want to go mad just free it up a little have an Evo 5 and a bike for real hooliganism also its my every day car and it's totally standard
Ask Santa for some punctuation before worrying about the car.
Typing one long paragraph like that is stupid.
this is one of the best moves imo
http://itsrockingwrestling.files.wordpress.com/2011/04/stonecoldstunner2528332529.jpg
staggy_gsi
09-12-12, 09:09 PM
Ask Santa for some punctuation before worrying about the car.
Typing one long paragraph like that is stupid.
We can't all be ace at English....
Get rid of the crossover pipe and fit a 1.9cdti airbox, depends how far you wanna go but the XEV inlet cam with a vernier pulley is a decent mod for not a lot of cash. Also ditch the pre-cat completely, and fit either a sports cat or ditch the main cat too. A session on the rollers with these mods and a vxr turbo should see 250-270ish....
When you get the new turbo, its worth fitting an oil restrictor bolt too as this is the main cause of turbo failure
Ask Santa for some punctuation before worrying about the car.
Typing one long paragraph like that is stupid.
Sorry my passion is cars and making them move a little quicker not where I should or shouldn't put a full stop so please keep your smart **** comments to your self thanks .
We can't all be ace at English....
Get rid of the crossover pipe and fit a 1.9cdti airbox, depends how far you wanna go but the XEV inlet cam with a vernier pulley is a decent mod for not a lot of cash. Also ditch the pre-cat completely, and fit either a sports cat or ditch the main cat too. A session on the rollers with these mods and a vxr turbo should see 250-270ish....
When you get the new turbo, its worth fitting an oil restrictor bolt too as this is the main cause of turbo failure
Thanks for your useful input that's all I wanted to no some simple mods that will work and not cost the earth. Ill start with the sir box local breakers have a few Vectras. Will I need a modified intake pipe or will the Vectra one work
FMIC kit
Remove precat and cat
fit vxr turbo
Maybe phase 1 or 2 remap
staggy_gsi
09-12-12, 09:59 PM
You will need a different pipe yeah. Not sure whether the vectra one will fit, i think the one on mine is from a corsa 1.8 sri but mines got a cone filter on so i dont know whether it would meet up with the cdti airbox...
paul080803
09-12-12, 10:14 PM
Tbh cdti box on its own is not gonna get you anything.
You can run xev inlet can on standard pulley one tooth back but that is not optimum, half tooth is best so vernier is ideal.
Vxr turbo, fmic, decat will see 270-280.
All depends on budget and how reliable/drivable you want it.
My mk4 gsi turbo was 327bhp on standard box/diff and a mates at 280 was a better drive and as quick in normal conditions.
I would be checking that the smoke ain't the stem seals as well
I've been told the cat really frees up some power when removed only I'm the only person around where I live with one of these so any info is much apreciated as I don't have any others to copy or work off
And don't want to waste money on pointless mods I'll go with the tried and tested
I would be checking that the smoke ain't the stem seals as well
Id recon the stem seals are ok it only smokes a little if left ticking over for a few minutes then a puff of blue smoke but never and while driving accelerating or decelerating it's fine only on tick over which I believe is common on these when they hit about 90k
Seen quite a few that are the stem seals on the z20lets, easy as piss to do though.
Stem seals and standard turbos are really the only two 'common' problems with these cars aren't they?
Think they're really well styled and nice interior.
Nope lol
Afm
Boost solenoids
Alarm unit
Moist getting into ecu that's in the bay
To name a few
paul080803
10-12-12, 12:10 AM
Id recon the stem seals are ok it only smokes a little if left ticking over for a few minutes then a puff of blue smoke but never and while driving accelerating or decelerating it's fine only on tick over which I believe is common on these when they hit about 90k
That is most likely stem seals on a zlet
Is it ill get a look in To that first then no point putting on a new turbo if not needed but am a little doubtful as theres no smoke while driving at all smoke after decelerating is usually stem seals but there isn't any
paul080803
10-12-12, 11:42 AM
How much oil, if any, do you have in the intercooler/pipework?
I would say its the turbo not seals
Haven't pulled any pipes off yet but throw 1 ltr in every month or so I'll pull off some this evening and take a look
I've been told the cat really frees up some power when removed only I'm the only person around where I live with one of these so any info is much apreciated as I don't have any others to copy or work off
And don't want to waste money on pointless mods I'll go with the tried and tested
I had an SRI Turbo not that long ago that i replaced both Cats with Miltek items, the difference it made on mine was quite considerable and the noise it made was even better. Thats where i would start along with a Front Mount.
That's where I was thinking of starting it's not really a problem around here running no cat only when it comes to test time can just refit but maybe an xev cam if that helps thought that only worked on the c20let but if not it's worth a try front mount next then better start looking
staggy_gsi
10-12-12, 11:12 PM
If its smoking on idle its deffo the stem seals mate. If the turbo was knackered it would smoke like hell on boost, mine did hence why mine now has a vxr turbo.
But mine needs stem seals now too, so im doing that next week, after its been back on the rollers on saturday
I'll check it out it'll more than likely need a new turbo but if it needs stem seals I'll throw in a set maybe stick a cam in to while in there
If its smoking on idle its deffo the stem seals mate. If the turbo was knackered it would smoke like hell on boost, mine did hence why mine now has a vxr turbo.
But mine needs stem seals now too, so im doing that next week, after its been back on the rollers on saturday
Not necessary true, on my last zlet if you let it idle long enough you couldn't see any houses in the street it was that bad but no smoke whatsoever when its moving or boosting, and was boosting fine too!
Same thing happened on 2 of my turbos
Not necessary true, on my last zlet if you let it idle long enough you couldn't see any houses in the street it was that bad but no smoke whatsoever when its moving or boosting, and was boosting fine too!
Same thing happened on 2 of my turbos
Yeh mines was the same, just a turbo swap solved it!
staggy_gsi
11-12-12, 11:51 PM
I stand corrected, i was just going from personal experience. Mine was smoking like mad on boost so chucked a new turbo on, still smoked a little on hot idle but 2 months down the line its really quite bad now. For example when stood at the lights for 3 mins if the engine is hot, when i pull away i cant see the car behind.
Oil in the boost pipes tends to be turbo seals, smokey but no oil in the pipes i'd go for stem seals. Also if its stem seals in these you would get a puff off smoke on start up. Plenty things to look out for though!
Seems a good bit of oil in the turbo pipes but never any smoke on start up it's only after it's been idling for a couple of minutes never a puff otherwise but either way a new turbo is on the cards mainly the bolt on easy mods and if any body has any bits give me a shout on it maybe a front mount kit decat
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