Joined: 09 Dec 2009 Posts: 60 Location: Syd Australia
Posted: Sun Apr 15, 2012 3:29 pm Post subject: seeing 5psi on second turbo.
Hi guys, don't post too often but i'm in need of some help.
I've spent the day trying each and every way to boost the second turbo, every time i take the car for a spin i've been seeing 5psi on the second turbo. MBC open, MBC closed, disconnected ETC.
I feel as though there's something else limiting the boost here, because I've just put everything back together as if it were stock and I am having the same issue. 5psi as she opens the second turbo.
What should I be looking for?
I was hoping to break 1:10 at wakefield by boosting the car before the trackday next week, but now i'm only seeing 5psi @ ~>4000rpm. this is much more of a problem than I thought!
The idea now is to go back to stock.
If it helps, I was using a TurboTech MBC from ebay.
Thanks
boost leak or vss things are playing up..........hit the search buttom champ thewes heaps of threads on this issuse _________________
a real car has 3 pedals
aristo's,rx3 fj20t,urvan z18t,v6 sigma,starion's,la lancer 2.6t aka 4u2no,gc galants
vn/lexcen turbo ,202 six 1200 ute,gh sigma turbo's
escorts,et turbo's,rx7 s3 13b jay port,ta22 celica
Joined: 09 Dec 2009 Posts: 60 Location: Syd Australia
Posted: Sun Apr 15, 2012 5:26 pm Post subject:
Ok, thanks for the tip although i have done a pressure test, checked all vac lines and silicone joiners. All good. Same issue. Seems to be a faulty vsv? I'm done with this for the day. Got 1 more weekend to fix this issue. Is it as easy as bypassing a vsv to resolve the pro lem or.something more? I will electrically check them next weekend. any other tips greatly appreciated.. Even a helping hand next weekend, I'll buy a case of beer
pm bmwturbo or chappo these guys are the tech heads for the factory twin set up im not so good with the electrical side of things...you could run it in ture twin turbo mode in instead ofthe seq mode that may net you more boost ..............i replacing my twins soon with a/m turbos
i have so much hate for the stock set up ........but anything mechcanical i can help you with if i got a baby sitter dude.......where in sydney are you _________________
a real car has 3 pedals
aristo's,rx3 fj20t,urvan z18t,v6 sigma,starion's,la lancer 2.6t aka 4u2no,gc galants
vn/lexcen turbo ,202 six 1200 ute,gh sigma turbo's
escorts,et turbo's,rx7 s3 13b jay port,ta22 celica
kool as..........im at harris park champ right next door havent seen your car floating around _________________
a real car has 3 pedals
aristo's,rx3 fj20t,urvan z18t,v6 sigma,starion's,la lancer 2.6t aka 4u2no,gc galants
vn/lexcen turbo ,202 six 1200 ute,gh sigma turbo's
escorts,et turbo's,rx7 s3 13b jay port,ta22 celica
I had a similar problem, only 5 psi on the second turbo. The hose for the EGCV was disconnected. Maybe your VSV for the EGCV is faulty, if your hoses are all plugged in correctly. _________________
ALSO FELLA......check the 2 little "bastards" at the firewall....
mate...i have been though this shit..!! found both had blown off UNDER the AICV "black" PIPE...
that runs from said valve to left of the engine.!
THIS..will need to be removed to see ANYTHING...
exactly the same symptoms as you describe bloke..... good luck mate
Joined: 09 Dec 2009 Posts: 60 Location: Syd Australia
Posted: Mon Apr 16, 2012 10:32 pm Post subject:
Thanks for the help guys.
I've just had another once over with the torch to see if any pipes are blown off.. it all seemed good [I will have a much better look on saturday]
I have an awful feeling like I might have just put a hose on the wrong way :s
trying to chase up some photos of the stock vac lines for reference.
Nick05 - I had a quick check of those 2 short vac lines running up behind against the firewall.. they also seem ok.. starting to scratch my head!
we had a mini meet at his place woggin i fitted the mbc for him. you should of came.................next you should come along too got do his intercooler,tranny cooler to do.........kane needs a motor ripped out _________________
a real car has 3 pedals
aristo's,rx3 fj20t,urvan z18t,v6 sigma,starion's,la lancer 2.6t aka 4u2no,gc galants
vn/lexcen turbo ,202 six 1200 ute,gh sigma turbo's
escorts,et turbo's,rx7 s3 13b jay port,ta22 celica
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im not so good with the electrical side of things...you could run it in ture twin turbo mode in instead ofthe seq mode that may net you more boost ..............i replacing my twins soon with a/m turbos
........but anything mechcanical i can help you with if i got a baby sitter dude.......where in sydney are you
Had the same problem too,hose was off,but could be the VSV for sure if the hose is on,hope you sort it out mate 
found both had blown off UNDER the AICV "black" PIPE...
good luck mate 
