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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 09-02-2008, 07:26 PM   #1
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ebay bypass valve

ordered this earlier tonight.



looks identical to the stock bosch one, just made of aluminum. not sure what i will get as far as a spring, but i just wanted something that would hold up better than the stock plastic one... this should do it. good price too.

couple others available for those who want them

http://cgi.ebay.com/ebaymotors/ws/eB...m=230287258085

i'll let you know when it arrives and whether its a quality product or not.
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Old 09-02-2008, 11:15 PM   #2
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It looks like a knock-off of the Forge valve. You'll have to let us know how the quality seems to be. The price is definitely good, about half of what Forge wants.
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Old 09-03-2008, 10:42 AM   #3
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Mike D has one just like this - I tried it out for a week when his car was out of comission and it worked wonderfully - much better than the stock unit and much cheaper than a BOV with very similar benefits.
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Old 09-03-2008, 10:46 AM   #4
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x2, awsome valve, never brakes, very very well made holds more than 30psi without any spring replacement, and still opens at less than 1 inch of vac. . Saabeh and therealET also run similer valves. really a great investment
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Old 09-03-2008, 10:50 AM   #5
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excellent news... thanks a bunch guys!
i was initially skeptical, but now i can't wait

do you know who manufactures it?
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Old 09-03-2008, 10:53 AM   #6
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please report back when installed, i hope you have as good of luck as i have
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Old 09-03-2008, 10:59 AM   #7
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Neat!

The sigle piston forge design is good and simple. I can see a knockoff working anywhere from great to OK with a similar deisgn. I'd assume its servicable? If so then it should be pretty decent for $50.

I personally like trolling boards to find people selling real forge units in the $70-100 range...but if I don't have time for that, this might be a good alternative!
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Old 09-03-2008, 11:09 AM   #8
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Quote:
Originally Posted by mike d View Post
please report back when installed
will do

Quote:
Originally Posted by JK View Post
The sigle piston forge design is good and simple. I can see a knockoff working anywhere from great to OK with a similar deisgn. I'd assume its servicable? If so then it should be pretty decent for $50.
my thought's exactly... bypass valves aren't the most complex of parts and i think it would be sorta hard to screw one up. then again, it is ebay
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Old 09-03-2008, 11:14 AM   #9
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Hope it works well for you
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Old 09-03-2008, 11:47 AM   #10
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Quote:
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Neat!

The sigle piston forge design is good and simple. I can see a knockoff working anywhere from great to OK with a similar deisgn. I'd assume its servicable? If so then it should be pretty decent for $50.
!
it is very serviceable, and simple,, Simple things are always the best.....
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Old 09-03-2008, 02:17 PM   #11
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That valve works amazing as I used to have one. It came with 3 springs and 2 washers. I never had any problems and it held boost and was very responsive. The fact that its not a legit forge valve didn't seem to affect it at all.
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Old 09-03-2008, 02:25 PM   #12
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ogh man, i took a chance in twice on ebay with bov's figuring i could make them work... they didnt. I got a forge atmos knock-off. Barely ever opened. I put in forge's lightest spring and it opens *better*. It is still not constant.

The other one is a hks ssqv knock-off. I know that it doesnt seal on the vacuum hose side. As in it doenst hold vacuum and therefore will not open. I've already cracked it open twice and i cant get it to seal any better.

It sounds like you found one of the few that will function, congrats, but do be careful.
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Old 09-09-2008, 07:32 PM   #13
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hey guys,
got the valve installed tonight and did a few runs. sounds awesome, but don't think i have the right spring in. i'm running about 2-3 psi lower than i was before. it might just need to be worn in a bit, but i'll play around with the different springs tomorrow and let you know.

question...
[my gauge tells me] i was running about 17 psi on my viggen with 3" DP and ETS intercooler (no tune). out of the three springs; soft, medium, hard (all relative of course) what would be my best bet? i know the only way to know for sure is to try them all, but i'm worried its just a crap valve.

thanks
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Old 09-09-2008, 08:57 PM   #14
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I use the lightest spring at 25+ psi and so does miked.
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Old 09-10-2008, 05:04 AM   #15
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thought so, thanks!
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Old 09-11-2008, 07:17 PM   #16
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got it all sorted out. the lightest spring works the best, got it to run 17 psi like before. decided to run it in "reverse" out of preference... i love how aggressive it sounds that way

you all know what a bpv looks/sounds like, but ill post pics and video tomorrow sometime
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Old 09-15-2008, 02:10 PM   #17
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well now i think i might have some boost leak. i noticed boost was down about 5 psi at peak. idle is still the same, but it just doesn't have as much umpf as before. i put the stock bosch valve back in, and its not as bad, but i'm still not back to where i was. i'm going to zip tie all the fittings and barbs this weekend and see if i slow it down.

if you are considering buying one of these i wouldn't recommend it until i figure out where my issues are coming from.
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Old 09-15-2008, 02:52 PM   #18
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3 people have great success, and 1 person doesn't. I think it was your installation, or maybe try a few other things.
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