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Boost, noise, & tests
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Posted by Eiron (more from Eiron) on Thu, 7 Aug 2003 10:01:03 Share Post by Email
In Reply to: Re: Valve orientation misconception?, Dean, Wed, 6 Aug 2003 07:16:31
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Hey Dean,

Have you added the MBC to the Aero yet? If your SET was boosting 16-17 psi max, any idea what your Aero is currently hitting max? Any idea about differences in turbo sizes between the two cars? (sort-of-related-question: is this the asymmetrically-boosted 6 cyl?) Is the Aero auto or stick? If stick, do you hear the noise at the front of the shift (off throttle, valve opens) or at the end of the shift (accelerate, valve closes)? When you pulled the shims out of the valve, did you take apart the valve & examine it for abnormal wear patterns which might give a clue about the noise?

The reason I'm asking is 'cuz I'm not yet 100% convinced that the noise is coming from the BPV.

As for testing the opening of the valves, I applied vacuum to the actuator ports in stepped increments, applying very low pressure to one port at a time. I recorded the vacuum level that each port would allow pressure to pass thru. (I repeated this test a minimum of three times with each port of each valve.) I have no means of determining valve speed, so the only things I tested for (in this instance) were holding force & "boost leak" resistance. In each valve, holding forces were greater at the bottom (piston/diaphragm face) port.

Of course, the unknown variable in your case is the design of the T-XS valve. I have no idea how similar it is to the Forge/Hyper piston designs. Can you provide (email me?) any descriptions or pics?

posted by 216.160.177...

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