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Old 10-12-2002, 03:07 PM   #11
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[quote="willwren"]Leave it to Mr. Blowzilla to humble us! Scott, you need to spend more time around here

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It'* great to have people around who know *everything*!!!

I am glad I went out and tried it, though!

Dan
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Old 10-12-2002, 04:34 PM   #12
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If you hadn't got a burr under your saddle, Dan, we wouldn't have learned something today
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Old 07-02-2007, 10:11 AM   #13
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scotts right. I've toyed with all the BBV lines when I had my stock pulley and found nothing can be done but lowering boost. I also cut a little wooden block and used it to brace the valve closed so that it is never able to bypass boost. I was expecting to see a boost spike when letting off from WOT like a turbo but had forgotten that when the TB closes, more boost cannot be made anyway (which makes me wonder why it is necessary to have such an intricate 2-way boost control system.) the result was a boost pattern that was basically the same as normal. I did notice that I would see boost peak out at 9 or 10 psi at high (near 6k) rpm unlike the normal which showed 7psi every time. The only explanation i could conceive of is that the boost side of the diaphragm is normally cut by the solenoid if it hits a specified pressure (~7psi) but I can't back that up with anything. I now have a 3.4" pulley that will reach 11psi and I tried bracing the valve shut again and it didn't seem to really do anything at all.
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Old 07-02-2007, 11:43 AM   #14
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Wow..you dug up an old one.. it must have been quite a shovel full finding it.

It is dangerous to block the bypass for the boost as it won't dump boost for shifts and when fuel isn't present.
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Old 07-02-2007, 12:02 PM   #15
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Do NOT mess with the bypass valve'* ability to dump boost on a street driven car. Start a new topic if you'd like to know why. That would be best in the Forced Induction section of the Forum.

The BCA and BCS are not the limiting factors in your boost level. The pulley alone is. It'* an on-off switch assuming everything is working properly. You either get it all, or none, based on the position of the BCA. Modifying the BCA and BCS will not get you any more boost.

This topic is 5 years old. Please don't dig up the oldies. Start a NEW topic. In this particular case, we know alot more than we did 5 years ago.
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