83Starion-11 Posted May 18, 2012 Report Share Posted May 18, 2012 As the title says, I have a 12a turbo from an 89' on my 83', and it boost to 8-9 lbs without any poblems, but then stays there....the kicker is there is no wastegate connected lol or air leaks. I have had a different 12a from an 89' on here before, and it boosed till 10 but was controlled with a wastegate, and would hit my fuel cut if i unplugged the wastegate so im at an awe here...any input would be great -Andrew Link to comment Share on other sites More sharing options...
MikeMeyerhoff Posted May 18, 2012 Report Share Posted May 18, 2012 are you saying there is no wastegate actuator on the car at all? Or is the the wastegate actuator present but the vaccum lines disconnected? Link to comment Share on other sites More sharing options...
wrngwae Posted May 18, 2012 Report Share Posted May 18, 2012 i had an issue where i blew out the intake manifold gasket,,,,,,,,did the same thing. Link to comment Share on other sites More sharing options...
83Starion-11 Posted May 18, 2012 Author Report Share Posted May 18, 2012 (edited) wastegate is not hooked up at all and there is a plug on the center ovcp nipple where it would go...there is a wastegate, it is just all plugged up...idk why I just noticed it today when I thought something seemed off... Edited May 18, 2012 by 83Starion-11 Link to comment Share on other sites More sharing options...
83Starion-11 Posted May 18, 2012 Author Report Share Posted May 18, 2012 I am wondering if it is because that ovcp is closed off? idk i don't want to hurt something by running it like it is, it doesn't seem right haha or normal Link to comment Share on other sites More sharing options...
tux Posted May 18, 2012 Report Share Posted May 18, 2012 spring in the wastegate should hold 8-10psi itself Link to comment Share on other sites More sharing options...
83Starion-11 Posted May 18, 2012 Author Report Share Posted May 18, 2012 ya, idk what is going on, im just going to run a line back to the wastegate like there should be haha, i was just wondering if anyone had any idea why or how a turbo can control its own boost at 8lbs haha. And ther are no intake manifold leaks or any other leaks going on. Link to comment Share on other sites More sharing options...
89BananaQuest Posted May 18, 2012 Report Share Posted May 18, 2012 If im not mistaken it should hold 8-10 psi or what ever the spring pressure is. If u have no boost source hooked to it Link to comment Share on other sites More sharing options...
Metric-man Posted May 18, 2012 Report Share Posted May 18, 2012 Do you have your secondary air pipe connected to the stock downpipe,or is your pre cat partially clogged? Link to comment Share on other sites More sharing options...
83Starion-11 Posted May 18, 2012 Author Report Share Posted May 18, 2012 I do have the secondary air pipe connected, and maybe, but I doubt it lol my cats are probably fried out lol, but that wont matter since i am putting on my exhaust today, so ill let you know if i find anything and i had no idea, i guess the last time i had the turbo hooked up it was connected to a 12psi wastegate. That could expalin it Link to comment Share on other sites More sharing options...
MikeMeyerhoff Posted May 18, 2012 Report Share Posted May 18, 2012 What people are trying to tell you is that the actuator has a preload (basically a spring). That spring in the actuator will hold the wastegate shut under normal conditions until it is overwhelmed by exhuast backpressure acting on the wastegate. The point where the spring becomes overwhelmed is not related to boost pressure at all... it could be 5psi, it could be 10psi... it just depends on the spring, the exhuast backpressure, and the preload adjustment in the arm. The job of the vacuum lines comming to the actuator is to force the actuator sping to follow boost pressure. Disconnect it and it won't. Link to comment Share on other sites More sharing options...
conquestTSIguy Posted May 19, 2012 Report Share Posted May 19, 2012 The end of the wastegate arm is also a way to "adjust" your boost if I'm not mistaken. Your screw might be turned out too far and that's all you'll get. But I could be wrong, it has been known to happen. Link to comment Share on other sites More sharing options...
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