Heya When I went out for a drive today something odd happened...with a warm engine (80 degrees) and WOT, my boost gauge shows 0.9 bar (13 psi), and the boost holds at that level (i let go after a second or so because car is getting a little fast)...which is odd, since even last week my boost was at about 0.5bar (7psi) As far as I know my car has no boost controller or boost jets (since it has always been low boost) Could this be: a) faulty boost gauge b) wastegate stuck closed I'm really hoping not b...since that's prolly bad...real bad, but wouldn't that cause the boost to climb to a ridiculous level rather than stop at 13psi? Or could that be because I have a massive leak somewhere that's letting the air out? The car doesn't feel any faster than before with this "increased boost"
you'd DEFINANTLY know the difference between 7 and 13 psi so i'm going to go with faulty boost guage... allthough 7psi is also a worry for you as that is safety boost
Yeah the 7psi is odd too, because the car has no error codes, 55's all the way. When it was checked out at AMEC I remember Pete saying something about the stock solenoids are unplugged or removed... The boost gauge is pretty much brand new from PZP...hmm..
I'm fairly sure it's staying at 0.9 bar, didn't want to push any further as I don't want to drive too fast. But going up a decent incline with WOT the boost seems to stay at that level. I have absolutely no idea how fast a car running at 7, 9 or 13 psi "feels"... the most so far is that I know it's faster than my old NA Could it be some sort of loose hose somewhere that's doing something?
Like Pex said reasons for overboosting is to do with your wastegates. If they are stuck open, you'll overboost. Also if your actuators have leaking diaphrams, it will overboost, if your hoses coming from your actuators to your boost solenoid or wherever have a crack or leak, this will also overboost. I would firstly find your actuator hose, disconnect anywhere in the line and try blowing into it with your mouth hard, it should hold pressure and not leak at all. If it leaks with you blowing into it - you have an actuator leak somewhere and this causes overboosting. Track down leak from there....
yep, i had battery acid spill on one of my acutator vacum hoses at a track day once. It ate through the hose and i think thats why i'm now having to do an engine rebuild
was wondering.....would a boost leak tester help in finding the leak if it was the actuator line? also...would caz's hose pack be suitable to replace that and also revamp all the vacuum hoses in the car? http://www.cazracing.com.au/catalog/product_info.php?cPath=27&products_id=99 thanks for the help
No and yes... No, a boost leak test will not show up a leaky actuator line. you have to do that one by itself - try the method i mentioned in an earlier post, it works. And Yes, Caz1 vaccum line kit is a good idea if you want to replace possibly worn stock vaccum lines.
hmm...disconnected what I think is the actuator line and did the blowing test and it held pressure pretty well. The car ran without overboosting for a day then the just tonight it's back to doing 0.9bar again, but the boost built up slower than last time. How do I gain access to the hose connection at the actuator? both sides it seems pretty tucked in, especially the drivers side...can these be accessed from under the car?
Benny, if your waste gates are stuck open then you wont get boost at all. I'm sure it was mis-worded though But the rest of it is correct and not a bad way to find the problem
Shit, good pickup Thanks Cam, good pickup! - yeah I 'meant' if the gates are stuck closed. it'll overboost. Yeah, if they're stuck open you won't be boosting any time soon. haha. :bash::bash:
should I reach the actuators from below the car or from the engine bay? Trying to figure out the problem now
