boxxout Posted August 3, 2010 Share Posted August 3, 2010 I have invidia catless UP and Cobb DP with SPT catback. Flashed Stg 2 like a month ago. Got my AP back from Cobb last week and wont boost past 11.6. Checked vacuum lines. What next? Link to comment Share on other sites More sharing options...
jmorris6689 Posted August 3, 2010 Share Posted August 3, 2010 it is a very common problem with these cars that the stock waste gate actuator will not allow you to run the full boost. you can always upgrade to a avo adjustable wastegate actuator or just do what i did and buy a bigger and better turbo. but try to unload the map and reload it and see what happens. Link to comment Share on other sites More sharing options...
amp0412 Posted August 3, 2010 Share Posted August 3, 2010 Get a manual boost controller. It makes everything 100 percent easier. I hit 20 psi consistently no matter how hot or cold it is outside. Makes tuning the car easier and allows you to make sure that you hit your target boost all of the time. Link to comment Share on other sites More sharing options...
whitetiger Posted August 3, 2010 Share Posted August 3, 2010 wow, 2 very horrible pieces of advice. the stock system is more than capable of getting stage 2 target bost levels without needing a MBC or a new WGA. The OP obviously has some sort of vacuum/boost leak. if the system is targeting 16-17 PSI which is standard for stage 2 it should reach it unless there is a leak somewhere. OP, make sure your IC to TB tube is secure and also, if you are running the stock TMIC, that all the tabs are still in good shape. Link to comment Share on other sites More sharing options...
clarkwgriswold Posted August 3, 2010 Share Posted August 3, 2010 Did you only look at the vaccuum lines? Put a zip tie on all boost lines and also tighten down turbo inlet and throttle body clamps. There is a "T" underneath the intercooler that is notorious for leaking. Link to comment Share on other sites More sharing options...
F-WDC Spec B Posted August 3, 2010 Share Posted August 3, 2010 Before you look for vacuum lines, something even more simple than that. IF you have th SI drive. Put it in S#. I mode tops out at 11. Link to comment Share on other sites More sharing options...
LosAngelesLGT Posted August 3, 2010 Share Posted August 3, 2010 wow, 2 very horrible pieces of advice. :wub::wub:WTig tellin' it like it is:wub::wub: Im running an Infamous tuned vf39 setup on OEM boost and hit 20 psi all the time. No need for a boost controller just a couple of pills or welding tips and a good tuner to get dialed in. OP: I am guessing its not a pill/controller/actuator issue as you (apparently observed?) made good boost before. Link to comment Share on other sites More sharing options...
boxxout Posted August 3, 2010 Author Share Posted August 3, 2010 Thanks for infor guys. Its 05 LGT. I will probably just take to IAG so they can check over it. So no WGA is needed? Should be hitting around 17 psi. Link to comment Share on other sites More sharing options...
amp0412 Posted August 3, 2010 Share Posted August 3, 2010 I have invidia catless UP and Cobb DP with SPT catback. Flashed Stg 2 like a month ago. Got my AP back from Cobb last week and wont boost past 11.6. Checked vacuum lines. What next? Sorry for my previous shortsighted response. Whitetiger is correct your stock boost control system should be fine for your car and there is more than likely a leak somewhere in the system. Good luck sorting out your issue as there is nothing that you should have to buy to fix the issue(i.e. manual boost controller and new wastegate actuator). Link to comment Share on other sites More sharing options...
peteyjr Posted August 4, 2010 Share Posted August 4, 2010 +2 on Whitetigers response. Check the hose for leaks/cracks going to the BOV. it happaned to me and was the culprit for low boost. Could'nt see the tear unless I took off the hose Link to comment Share on other sites More sharing options...
lordchilly Posted August 4, 2010 Share Posted August 4, 2010 Before you look for vacuum lines, something even more simple than that. IF you have th SI drive. Put it in S#. I mode tops out at 11. ^^^ I agree, thats what happened to me after my tune. I hit the I drive by mistake and wondering why Im not going. Link to comment Share on other sites More sharing options...
MDKSDMF Posted April 22, 2012 Share Posted April 22, 2012 same issue. no visible boost leaks on the turbo and vaccum lines near and around the turbo. thot i had a faulty solenoid so i put in a hallman mbc. i got some boost back but i stilll either have a leak or my ecu wont let me boost higher because the tune is for the solenoid and not the effects of an MBC? Link to comment Share on other sites More sharing options...
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