ok. so I finally got everything ironed out on my car and once I put my midpipe on I get overboost after about 5K on the 2nd turbo (obviously). my primary boost is rock solid...right to 11 psi and then the transition is excellent 11-9/10-11...but once I hit about 5 grand it starts to creep pretty bad...I havent seen it stop, but I have only let it creep to 14 psi in hopes that it would back off...nope. I am looking at porting the wastegate. And upon inspection of my spare set of twins (practice), I noticed that there is a plate on the back side of the secondary wastegate. I have an extra gasket on my spare set of twins that I can put on. I am thinking that the wastegate plunger might be restricted by the rear plate. of course this is fine on a stock/ slightly modded car where back pressure is present since the wastegate doesnt need to bypass as much axhaust. I would like to avoid porting the wastegate if I can. Is it a bad idea to try before porting the wastegate?



mods in sig. https://www.nopistons.com/forums/pub...#>/biggrin.png



Thanks for your help,

Sean

up, up, and away. I really need some advice. Thanks guys.

my only advice would be to get a boost controller

yeah, get a good boost controller that can control your boost better (dual solenoids instead of single)



you'll be set

i am interested in this as well. porting the wastegate isn't needed? a boost controller will be able to stop the creeping?

thats what Im thinking...I have two boost controllers. its in the sig. https://www.nopistons.com/forums/pub...DIR#>/wink.png but the extra gasket on the secondary wastegate backplate did not work as well as I had hoped. I am going to stick a restrictor gasket between my midpipe and downpipe until it warms up. I dont have the money or the steady hand(dont trust myself) to do it right now.