Hi all,
I have 33 GTR.
It have the following performance modifications;
- HKS Pod filter.
- HKS front pipe (3" to cat).
- 3" Gutted cat.
- HKS 3.5" cat-back exhaust.
- Boost restrictor removed.
Last night, my friend and I noticed something strange. 4,000rpm, it make whistling sound and when it's warmed, it is struggling to build boost. I left it to cool down for couple of hours then drove home, I have no issues building boost to 14psi, after 20 minutes it was struggling to make 1-3psi.
Tried this morning, it did the same then turned the car off for 5-10 minutes, got boost but didn't drive further to really check it again.
No white/blue smoke coming out of exhaust.
I still have oil pressure, and it is behaving like it should.
Checked all the clamps, but after doing some researching it appears the vaccum hoses may be the culprit?
I think the rubber hoses (afm to turbo or FMIC piping) may shrink from the sucking air from the turbos - which may be the case seeing the GTR is 14 years old?
I'm not sure if the air is leaking - I'll need someone to try to hear it for me (I'm deaf so can't hear zip).
Haven't checked the exhaust yet, but someone mentioned exhaust manifold gasket so will check it out.
Any ideas or suggestions?
Godamn GTR!
Thanks in advance.
Grant