I was even going to measure boost out of each turbo as the new 15G comp housings have a nipple on them….
You can't do that because they're in parallel, as in same pressure.
As for the rest of it, I don't understand the 1 way valve. The rest won't make any difference.
The reason that the FPR line is suggested (for pressure sensing) is because there's no flow so no pressure loss along the length of it.
Likewise taking the WG opening pressure from pre throttle or straight off the turbo, you'll have a bit more pressure at the turbo than at the (pre) throttle......it will prevent boost creep which you don't have.
When you finally pull it down, check the rear exhaust manifold for warpage at the cylinder head flange, it's quite common on all engines and will cause the symptoms you've got. It's easy fixed with a linisher. Other things can cause it too of course but always worth checking.
quote from barryboys.
Yes, yes, yes, that might be so, but you're clearly missing the bigger picture.....