Bypass valve

Q&A regarding engines, turbos, and intercoolers and power upgrades

Bypass valve

Postby Killerguppy » Mon Aug 09, 2004 11:42 pm

I just installed a bypass valve (Bosch) into my 88' Alltrac (has a 93 Jap import). I am wondering if anyone has a decent photo of where to install the vacuum line from the bypass valve. Or can someone point me in the right direction.
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Postby RedCelicaTRD » Mon Aug 09, 2004 11:47 pm

Tap into any line AFTER the throttle body. The one going to the fuel pressure regulator is a good choice.
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Postby alltracman78 » Tue Aug 10, 2004 12:21 am

There's a cap on a v port on the back of the manifold, near the map sensor. It works nice.
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Postby Gary » Tue Aug 10, 2004 1:47 am

Here is the one alltracman78 is talking about.

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93 ST185
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Postby Killerguppy » Tue Aug 10, 2004 12:37 pm

These ports seem to be of larger diameter tubing than what my bypass valve uses, should I just use an adapter to couple them together?
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Postby Gary » Tue Aug 10, 2004 2:57 pm

Killerguppy wrote:These ports seem to be of larger diameter tubing than what my bypass valve uses, should I just use an adapter to couple them together?
Thanks


Sure you can. :wink:
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Postby RIalltrac » Tue Aug 10, 2004 10:33 pm

I'm bout to install my new topmount/bov & a boost gauge, can I use that one port for both? or is that overkill for that particular port?
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Postby mototebok » Tue Aug 10, 2004 10:58 pm

Yes you can, both are sealed air passages. Go for it.

Just get a reducing Y for it then ;)
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Postby ChrisD » Thu Aug 12, 2004 1:46 pm

edit
Last edited by ChrisD on Thu May 06, 2010 4:22 pm, edited 1 time in total.
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Postby zblu81 » Mon Aug 16, 2004 1:49 am

Is the bosch bpv any better than an MR2 bpv? How much does the bosch cost and where did you get it?
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Postby alltrac.net » Mon Aug 16, 2004 1:59 am

The bosch is not as good as the MR2 in design. However, it operates well and smoothly and installation is quite easier.
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Postby zblu81 » Tue Aug 17, 2004 1:25 am

what makes the bosch valve easier to install? Doesn't the MR2 bpv require VTV as well?
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Postby toayoztan » Tue Aug 17, 2004 2:23 am

zblu81 wrote:what makes the bosch valve easier to install? Doesn't the MR2 bpv require VTV as well?


I know the mr2 bpv HAS the VTV, b/c that's what i'm missing. However, i was told that it wasn't needed...I'm wondering if this is true? because otherwise, that part is 49.xx bucks from Toyota.

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Postby zblu81 » Tue Aug 17, 2004 3:33 am

if an MR2 owner switches to an aftermarket bov wouldn't that eliminate their need for the vtv?
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Postby alltrac.net » Tue Aug 17, 2004 5:08 pm

Another engine that uses the same valve like MR2, does not have a VTV. Just T the line going to the top to the bottom. Should work fine.

The bosch valve is small, fits right into a SAMCO T hose, and points towards the intake.

The MR2 valve is a large beast and takes lots of work to install into a T hose. The pressure side of the MR2 valve is a FLANGE, which looks strange but still installs to the tube.
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