Drivetrain Aftermarket bypass valve

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Jul 13, 2005 | 08:08 AM

#26

DarkMiniCooperS

6th Gear

Joined: Dec 2003

Posts: 1,805

Likes: 30

From: Quebec City, Qc

Yes, the upload website is a bit weird... Just let it wait for 45 seconds and the dowload link will apprear on the upper left corner...

It's a Word document, from Chad (Detroit Tuned). Very well done and simple!

Jul 13, 2005 | 08:09 AM

#27

xsmini

6th Gear

Joined: Jul 2002

Posts: 2,228

Likes: 28

From: Bishop, Ca

Thanks, looks fairly simple. New weekend project

Nik

Quote:

Originally Posted by DarkMiniCooperS

I've found a free one, probably not the best, but it works!

http://www.megaupload.com/?d=25QZIPDU

Jul 13, 2005 | 08:50 AM

#28

bomboasy

4th Gear

iTrader: (5)

Joined: Jan 2004

Posts: 304

Likes: 1

From: Austin-Texas-US-Earth

Matt, your "ps" is why I think that Ryphix#2 and VGS combined get the best of each other. The BP does not open all the way due to the spring in Ryphix#2, but better than Ryphix#1, and VGS helps to keep it shut under high boost (if the spring is not enough). If you have open up your exhaust with a header and a cat-back, try them together.

This is the best way I have been able to make my case for the combination mod. reading your PS was like a light came on as to how to simplify the reason why to do it. If people do not try this after this explanation, I give up trying. I guess I can enjoy the combo mod of Ryphix#2 plus VGS all to myself.

Bomboasy

PS. Below are some links to help you install the BV and warnings to keep you from getting into trouble.

https://www.northamericanmotoring.com/forums/showthread.php?p=423903#post423903

https://www.northamericanmotoring.com/forums/showthread.php?p=527458#post527458

Quote:

Originally Posted by Dr Obnxs

Really, find out what the system is for before thinking about bolting it onto the car. If you want improved throttle response with our cars, in order of impact.
1) VGS - uses posative feedback to prevent oscillations (get vacuum from high pressure side of SC).
2) Ryphix II. This is the stronger spring. BP doesn't open all the way, and opens at higher vacuum level. Means it closes earlier in the RPM range, and it closes HARD (very abrupt transitions).
3) Ryphix I. (Wire tie valve closed). PRetty much like removing it.

I too ajusted my bypass. Not to hard at all if you do one trick... Take two of the studs of the Intake so you can put that Al IC-Intake runner in without goiing trough every swear word you know. Cut or trash the BMW hose clamps, and use two new screw type ones. It's less than a hours work, including the 15 min to get the nerve to take it all apart!
Some have reported about a pound of boost increase with the fix. I didn't log any data, but mine was pretty bad. There are photos in the Yo-Yo chronicals.

Matt

ps, some want an aftermarket BP valve (there's one available in Japan) because as normally connected, very, very high boost can push it open. So the aftermarket unit with ajustable spring... Allows you to set max boost as well. I think the VGS system isn't as prone to this. Under boost, the valve is pushed more closed......