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 Post subject: Plenum MAP sensor
PostPosted: Mon Feb 03, 2014 12:53 am 
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Joined: Wed Jul 13, 2005 12:06 am
Posts: 4741
Location: Perth, Western Australia
Car Model: ST205
Does anyone know what the small black cylinder mounted on the plenum MAP sensor pressure line does? Is it some sort of one-way valve? Just wondering if I should use this on the GM Delco MAP sensor I'm using on the ST215 Caldina side feed I have on the track toy build.

ST205 GT-Four Plenum
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ST215 Caldina Plenum - a spare which I sold to Dave Prior for his ST205 JEMS built engine. This has a lot more vacuum ports than the new one I bought from Toyota GB.
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Track Toy 'Caldina' Plenum - note there are many fewer vacuum ports than the one above.
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Normally I wouldn't worry about the fewer number of vacuum ports but it looks like the black cylinder performs an important function? Current plan is to convert the central M16 temperature sensor port to a 1/8 NPT MAP sensor port

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1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
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 Post subject: Re: Plenum MAP sensor
PostPosted: Mon Feb 03, 2014 2:04 am 
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Group B
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Joined: Sat Sep 02, 2006 3:13 pm
Posts: 3587
Location: Bournemouth
Car Model: None
99% sure it's an orifice to damp down the pressure variations between intake strokes.

The feed to map sensor should ideally come from a point on the plenum where all cylinders have an equal effect so i would guess near the top at the throttle body end. Use the orifice fitting to feed the map sensor from the best point and then use T pieces to get enough exits for everything else.

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 Post subject: Re: Plenum MAP sensor
PostPosted: Wed Feb 12, 2014 8:20 pm 
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Group N

Joined: Wed Oct 20, 2010 8:37 pm
Posts: 285
Location: uk southampton
Car Model: ST205
As above im still using this in line with the ross mani luckily it has 5 outputs at oposite end to tb.


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 Post subject: Re: Plenum MAP sensor
PostPosted: Tue Mar 17, 2015 11:03 pm 
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Joined: Wed Mar 11, 2009 3:43 pm
Posts: 30
Car Model: None
So I should be using the small black cylinder for the map sensor line too then.


I've got the caldina manifold too had hardly any vacuum takeoffs

In need of the throttle cable bracket if anyone has one spare :?:


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Getting there ....

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