BOOST problems

[fd3s_rx7]

I\'ve notice that my first boost is up till 12 lbs to 13 then when it hit 4 to 5 thousand RPM it drops a significantly to 5lbs or 4 lbs. then it\'ll fluctuate around there untill redline... Happens on all gears.. What could cause my car to run like this??

Because sometimes time after time, boost will come regular just like normal, pattern 13, 10, 12.....(NORMAL))

But now, when boost pass 4k to 5k RPM it\'ll drop to 5lbs and fluctuate around there till redline....

 I\'m thinking it\'s the top end secondary turbo.. or just a hose..  Hoping just a hose!!
Thinking about doing a vacuum hose, seloinoid hose job.

Have any of you guys bought anything from //www.hosetechniques.com..????

Are there hose any better??

Thanks

[Shaq]

I had EXACTLY the same problem last night, pulled over and found one of the vacuum line s had come off the (I believe) vacuum chamber box, the pipe must have got brittle and slipped off so I replaced quite a few vacuum lines while I was there with some high temp silicon samco stuff. The vacuum chamber is a small box under the strut brace in the middle. The strut brace will have to come off to gain access, anyway check this and all other vacuum lines. its prob one of those vacuum lines.


Shaq

[Fishy]

Might be worth having a look here!

Dan