Benjamin_John93 Posted May 28, 2017 Share Posted May 28, 2017 Finally got myself a 1996 R33 GTST after owning a few n/a's. Car is stock except for front mount intercooler and boost tee(currently wound all the way down).3" exhaust from turbo back, cat has been gutted. But im having issues with boost. I only want to run 7-10 psi max but for some reason the boost will just continue to climb untill over 15psi then starts to cut out. I have tried using the stock boost controller but makes no difference. Car had a boost leak which i thought was the problem but i did a boost leak test and fixed the leak, problem still exists. I decided to check out the wastegate actuator but seems to open perfectly fine(not hitting dump). On inspection of the turbo i noticed that there was no compressor outlet where a hose should run from it, to the boost controller, then into the wastegate actuator shouldnt it? Instead my car has a T piece from a hose that goes from the manifold to the charcoal canister? Dont know much about turbo cars as this is my first and really dont understand why its overboosting so much? Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/ Share on other sites More sharing options...
Benjamin_John93 Posted May 28, 2017 Author Share Posted May 28, 2017 Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831718 Share on other sites More sharing options...
Griffin Posted May 28, 2017 Share Posted May 28, 2017 Is the knob on the bleed valve wound in all the way? Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831719 Share on other sites More sharing options...
Benjamin_John93 Posted May 28, 2017 Author Share Posted May 28, 2017 The boost tee? Its wound all the way down but backed off a little Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831722 Share on other sites More sharing options...
Griffin Posted May 28, 2017 Share Posted May 28, 2017 Sorry didn't see that it was. Is there a check valve on charcoal cannister? Check the t piece to see if it's not restricted. Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831723 Share on other sites More sharing options...
admS15 Posted May 28, 2017 Share Posted May 28, 2017 All the way down is full boost. Turn it anti clockwise a couple of turns and check boost again. Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831724 Share on other sites More sharing options...
GTSBoy Posted May 28, 2017 Share Posted May 28, 2017 And failing that.....the boost signal must be from the compressor housing, or some point on the turbo-intercooler-plenum pipework. Anywhere else is stupidly wrong. 2 Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831726 Share on other sites More sharing options...
Benjamin_John93 Posted May 28, 2017 Author Share Posted May 28, 2017 All the way down is full boost. Turn it anti clockwise a couple of turns and check boost again. It is turned all the way anti clockwise and back off ever so sightly. But i have the same issue even if i connect it to the stock boost controller aswell. Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831729 Share on other sites More sharing options...
Benjamin_John93 Posted May 28, 2017 Author Share Posted May 28, 2017 And failing that.....the boost signal must be from the compressor housing, or some point on the turbo-intercooler-plenum pipework. Anywhere else is stupidly wrong.There is nowhere on my turbos compressor housing to connect the hose to like there should be, and nothing on the intercooler piping either. Could the issue be that the hose goes from manifold to boost tee then wastegate? Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831732 Share on other sites More sharing options...
admS15 Posted May 28, 2017 Share Posted May 28, 2017 There should be a nipple on the intercooler pipe that goes to the throttle body. That should be the boost source. Doesn't sound like yours is like this. Remove the boost controller and run the line direct from your boost source to wastegate actuator and see if you get low boost. Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831734 Share on other sites More sharing options...
admS15 Posted May 28, 2017 Share Posted May 28, 2017 Standard turbo does not have a boost source fitting on housing. Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831735 Share on other sites More sharing options...
Benjamin_John93 Posted May 28, 2017 Author Share Posted May 28, 2017 There should be a nipple on the intercooler pipe that goes to the throttle body. That should be the boost source. Doesn't sound like yours is like this. Remove the boost controller and run the line direct from your boost source to wastegate actuator and see if you get low boost.Cant find any hoses on the intercooler piping that run to throttle body, there is one hose that runs from throttle body to charcoal canister? Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831737 Share on other sites More sharing options...
Benjamin_John93 Posted May 28, 2017 Author Share Posted May 28, 2017 This is the wastegate on the car, after some googling looks to be an r34 one?This one is a spare i have in the garage which was ment to be off an r33. (has asn79 written on it ) Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831740 Share on other sites More sharing options...
GTSBoy Posted May 28, 2017 Share Posted May 28, 2017 Look. The actuator doesn't matter a shit. They're both 5 psi items. What matters is that your boost source is coming from somewhere wrong. The fact that there is no nipple to connect the boost control to on the intercooler pipework IS THE PROBLEM. Trace the connection back to where it comes from. if you cannot see/prove that it is 100% from upstream the throttle, with no solenoid valves or check valves or anything else in the way, then fix it. This will mean PUTTING A NIPPLE ONTO THE PIPEWORK. Which would be 100% what the doofus who installed it all should have done, and apparently didn't. 1 Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831763 Share on other sites More sharing options...
Benjamin_John93 Posted May 29, 2017 Author Share Posted May 29, 2017 Look. The actuator doesn't matter a shit. They're both 5 psi items. What matters is that your boost source is coming from somewhere wrong. The fact that there is no nipple to connect the boost control to on the intercooler pipework IS THE PROBLEM. Trace the connection back to where it comes from. if you cannot see/prove that it is 100% from upstream the throttle, with no solenoid valves or check valves or anything else in the way, then fix it. This will mean PUTTING A NIPPLE ONTO THE PIPEWORK. Which would be 100% what the doofus who installed it all should have done, and apparently didn't. Okay thanks heaps mate I will tap a fitting into the pipework and run it straight to the actuator for now, ill be sure to let you know how it goes.Thanks again for the help, really appreciate it Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7831906 Share on other sites More sharing options...
Griffin Posted May 29, 2017 Share Posted May 29, 2017 See the shiny pipe your hand is on in first pic ? The pipe that replaced has the fitting on . Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7832015 Share on other sites More sharing options...
Benjamin_John93 Posted May 31, 2017 Author Share Posted May 31, 2017 Thanks for the help everyone, i tapped a new fitting into the intercooler piping as suggested and boost is holding perfectly, no more overboosting! [emoji4] 1 Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7832294 Share on other sites More sharing options...
Benjamin_John93 Posted June 4, 2017 Author Share Posted June 4, 2017 So turns out that not only was the boost signal coming from manifold the problem but also both my factory boost solenoid and boost tee are faulty. I ran the hose straight from the intercooler to wastegate and get 5psi with no issues, i then wanted more boost so i connected the hose from intercooler to stock boost solenoid(the top nipple) and a hose from wastegate to the solenoid(bottom nipple) and thr car ran like shit and then died on me about 200m down the road.(and yes the solenoid was plugged in)So now im running a 10psi wastegate from an r32 which seemed to be working perfectly the first time i drove it, went to drive it again later that night and as i was slowing down for lights it died on me and started running like shit (im assuming it R&R). So im wondering if i keep the 10psi actuator on is the car gonna keep going into r&r until i get an aftermarket ecu + tune?And is my boost solenoid had it or am i plumbing it up wrong? Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7832866 Share on other sites More sharing options...
GTSBoy Posted June 4, 2017 Share Posted June 4, 2017 R&R won't cause the car to stall off boost. You have left a big leak somewhere in your pipework, or some similar mistake. A 10 psi actuator will not cause you any trouble, it will just cause the full load mixtures to be very rich, and the car to be slower than it should at that boost (due to the other half of R&R). Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7832882 Share on other sites More sharing options...
KiwiRS4T Posted June 4, 2017 Share Posted June 4, 2017 2 hours ago, Benjamin_John93 said: And is my boost solenoid had it or am i plumbing it up wrong? You are plumbing it wrong. You need a plain T (or maybe your boost T is OK after all). Boost signal goes from intercooler pipe to T. Another line goes from T to actuator. Third line goes from T to solenoid. The other solenoid pipe goes to bov return pipe (or leave it open to atmosphere until you can sort out a nipple). From stock there is a restrictor somewhere (maybe on the boost signal pipe?) but even without that you should have better boost control. Link to comment https://www.sau.com.au/forums/topic/470626-help-cars-overboosting/#findComment-7832888 Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now