This is my first post so sorry if anything is incorrect or it is in the wrong category. I have a rebuilt C39 turbo with a tial 38mm external waste gate on my car. It uses stock exhaust manifold with a flange welded to it in order for the wastegate to connect with a v band clamp. We have not been able to hit peak boost, and are very slightly off by maybe 2lbs or so and my tuner has had me go over the entire car checking for leaks, turbo damage and such. While doing this, I found no leaks and no turbo damage, except there is a slight exhaust smell near the wastegate. If I’m not mistaken they leak slightly, but the v band clamp on the inlet side of the wastegate (where it connects to the manifold) was misshapen due to us having to manipulate it to come off with a flathead and rubber mallet because it was previously already misshapen. We straightened it out, and beat it on, and got it relatively tight, but it would not go any tighter than we got it. It’s tight, but not tight tight if you know what I mean. I’m out of options at this point as I’ve gone over the entire car, retorqued everything, and even gone as far as lubing my gfb Dv+ to make sure it’s not sticking as I read they can overtime if not lubed. Everything is set up correctly as confirmed by Adam at tune+ as well. Springs in the wastegate are correct. Everything is correct and that’s why I’m stumped, that’s why my only answer could be that the messed up v-band could be the source of a small leak and therefore causing me not to hit peak boost. Any help or two cents is appreciated, thanks.
