2003 Hellion Cobra overboost issue

[uae_lightning]

Were facing an issue on my friends Hellion twin turbo Cobra with compound boost,

Car has nothing but a complete Hellion twin turbo kit and a smaller upper pulley.

Issue is that it goes all the way up to 25 psi which is very risky on these engines, I tried almost all vacuum diagrams I could find but no use. I even disconnected the Boost controller and had the vacuum ling running from compressor to lower port of WG but still ran 25 psi.

Currently using the 5 psi spring on the wastegates.

However while trying different ways of vacuum lining we managed to pull 14~15 psi on the cobra and I wanted to know if 15 psi is safe to run on these engines or not.


any help is appreciated.

Thanks.

 

[Nightmare302]

Ditch the blower, go twin turbo only - profit.

 

[MTBSully]

Check vac lines for rips. I had the same problem on the dyno last spring and it turns out one of my vac lines had a massive rip in it

 

[uae_lightning]

Ditch the blower, go twin turbo only - profit.

Told the owner like 1000 times to do that but he wouldn't listen.