Collapsed Flex Section

[1ViciousGSX]

Well after working out of town for the past 20 months I'm back home. Before I left to go work out of state I was having a problem with my car not wanting to build high boost. This is the reason why I haven't been running it much since my 11.45@126mph pass on 93 pump. I've been scratching my head over why I was having this issue. My main issue was excessive high exhaust manifold pressure related to intake boost pressure.

At 20 psi of intake boost I was getting 35 psi of exhaust pressure in the manifold for a 1.5:1 pressure ratio. Not great, but could be better.

But I was hitting a boost wall of 25-27 psi. My car would not build anymore boost, period. I even mechanically jam closed my waste gate to make sure it wasn't opening under boost. When this happened I would get 25 psi of intake boost pressure and 50 psi of exhaust manifold pressure. At 2:1 pressure ratio there was a problem.

Well I'm back home now and thanks to a thread on another forum I have found my problem.

This is my 3 inch s/s flex section from my new exhaust system seen here....
http://www.mitsustyle.com/forums/showthread.php?t=16155&page=3

Anybody see a problem??? :angryfire:
We cut the internal webbing bands and pulled it out. Still has the external webbing for support.

[Halon]

Wow, well at least you found the problem.

[1ViciousGSX]

Now to hammer out that 10 sec pass.

[Halon]

Get on it! Racing this weekend?

[1ViciousGSX]

Get on it! Racing this weekend?
Not yet, still ridiculously hot here in Louisiana, but once it starts to cool off,.............. It's on.

[awd-drifter]

there are nails on the ground, thus, nails are in your tires?? hahaha jk. That is one heck of a nice white 2gb you got there! so clean...so clean...

[goodhart]

Crazy. Glad you found it, it's been forever since you've posted anything but politics haha

[asshanson]

Wow, didn't know that could happen. With the internals out, is it going to leak? Not a big deal I suppose, maybe just a bit louder?

[Goat Blower]

This is happening a lot lately.

[1ViciousGSX]

Wow, didn't know that could happen. With the internals out, is it going to leak? Not a big deal I suppose, maybe just a bit louder?
It won't leak, the webbing is only there to support the bellows section, but it's solid, no leaks.

Now the real question is,............... how much of a problem was this when I made the 11.45@126 / 22psi pass??? Immediately after making that pass I only did three things, installed the FP4R cams, poured in some C16 and cranked up the boost. And that is when I had the problem start showing itself, the engine choked off at 25 psi.