Bypass valves..

[5LVENOM]

My new motor should be here by the end of the week. I'm planning on putting on the 2.95 before getting it re-tuned (I'd like alittle more boost 12-14), but I'm concerned about the by-pass valve. I am still using the bosch style that came with the S-trim kit, I was making 9-10 psi with the old combo, the new combo is only different in the sense that its all forged, and its a 327 not a 302, so I don't know what if any affect this will have on boost #s, if its seeing 12-14psi, should I go with a bigger by-pass? Which one etc.? And is it a must? Thanks guys.

-Rob

[MeJay Racing]

Not sure if this matters but a buddy of mine was running a 2.75 blower pulley on his totally stock motor (read lots of back pressure) car with the stock Bosch bypass and never had any troubles. We do however live at a mile high so don't see as much boost as those who live closer to sea level. So I believe you will be fine.
Mike

[Starrman]

I ran the stock bypass for a while putting out 13-15psi of boost. It worked fine, but I heard it's really only good for 10-12psi. I bought a higher rated Bosch valve (looks exactly like the one that comes with the kit) but it's rated higher and has brass innards. It's a model 110 where as the stock one is like a 102. You can get them at Saab, Audi, Porsche dealers and I've also heard they can be gotten at Autozone. They'll run anywhere from $25-$40 roughly

[5150 LX]

Here's the cheapest source I have found yet for the Bosch 110 unit. I plugged in part# 0280142110.

http://www.drivewire.com/Result/KEY0280142110.html

[BlownWhite-SN95]

Rob-

I was told not to use it for anything more than 10PSI. You can either break it, or it won't let off enough (boost) stress for the supercharger on decelleration.

[5LVENOM]

Yeah Tarik I figured to do it right I would need a bigger by-pass, I just don't want to spend another 200 buck if I don't have to.
110 part # cool, 27 bucks...cooler, and I won't have to remake /cut and fab my powerpipe. Thanks guys.

[RdRunnr]

I was running up to 18 psi with my stock bypass...the only reason I switched was because my YS came with the nice one.