I know there has been several threads on this, but the general consensus is that it could be a million different things, but my setup should (I would think) be working much better than it is.

im experiencing a heavy boost creep after vtec. 9psi spring, and it will see 9-10.2 on the low cams to near redline. With vtec set (5k RPMs) it’ climbs from 9.2 to 20 by 7800-8k RPMs.

my last setup, with a log manifold, I had this issue, the only difference is, with the log manifold, at 8k rpm it would spike to at least 21.5(boost cut). To resolve this, the redline was dropped to 7800 to avoid it.

since I have switched to a ramhorn. Same set up, and now nearing 8k, boost pressure will actually drop back down. So while I think I may have corrected the issue of a possible flow issue up top, I have created another one with uncontrollable boost levels. I wanted opinions/advice/experiences on my proposed solution.

but first, what I’m running
GSR
81.5 9.0:1
eagle rods
gsr cams
Ported cyl head from prior NA build, using sk2 springs, retainers, and flat faced valves.
garret ta3405 (t3/t4 “57” trim, JB turbo with stg3 wheel)
tial 38mm WG open dump tube
ram horn manifold
3” downpipe
WG signal is currently be directly referenced from the turbine housing.
I do have a manual boost controller, and there is a Mac solenoid installed as well, but are currently not in use as using either of those helped anything.

ignition up top is around 14, with AF staying 11.6 and dipping to around 11 when the boost level dips near 8k (I’ll grab a data log if it will help)

im assuming, as i have read several times, the 90* placement of the WG isn’t good, but i guess I don’t understand why thousands of folks run it, and it’s fine. What ls in my head is take the manifold, remove the 38mm flange and pipe section, and go in with a 2” piece of pipe at a slight angle and go to a 50mm wastegate to help expel them gasses from continuing to thrust into the housing. I’ve read some people even have an issue with 44mm WG as well, but I think it’s not quite as severe.

does my ported head have something to do with all of this? Some creeping I understand, but I can’t adjust the pressure because I’m always hitting the boost cut I set If I try to bring the boost levels up earlier, hoping that if I get to the 20psi I’m after that it would stop creeping. But when I do it goes into vtec and wants to go up very quickly to cut. The car isn’t experiencing a power loss, as it pulls pretty hard in vtec.

I’m just not sure if going through all this with the manifold will actually correct the issue. And am seeking some others advice on where to go with this. Any help is appreciated.