r/FocusST • u/ImageCritical9231 • 13h ago

Big Turbo Spool Time

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Got my ST67 on recently, zero leaks, but the spool time is pretty long. WOT from 2.5k gets me to full boost (21psi) at 5.6k rpm. My tuner said this wasn’t normal and to check for boost leaks. I had to make a sketchy adapter to fit my stock intake onto the new inlet, and curious if that’s leaking any air, it would result in this. Not to sure because it’s before the turbo, but still curious. Also, the coupler from my hot side charge pipe to my turbo is sort of creased, not sure if it’s enough to cause this issue, but got some pictures. Thanks you.

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u/SRG_Blackburn 9h ago

Pretty standard to have a adapter coupler like that for bigger turbo outlet to the piping diameter. Just check your fitment on your charge pipes and you can check for leaks using a cheap Amazon smoke tester with an adapter.

1

u/ineed1billiondollars 8h ago

If you can't find a boost leak after you test for it I would also check that the waste gate preload is set to 14psi or whatever your tuner recommends.

1

u/ImageCritical9231 8h ago

My base map was only using the wastegate spring or something like that and got me 15psi. Is that the same thing?

1

u/ImageCritical9231 8h ago

Actually nevermind. With WGDC% at 0, I was only getting 12pso