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Join Date: Dec 2006
Location: Germany
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boost sensor characteristic needed

Hello,
I am working on a project and need the characteristic
from our original 930 boost sensor.
I have a `87 930, I think there are only 2 sensor versions.

I tryed to map mine, but there is no resistance change
under pressure. Seems mine is broken.

Maybe one of you took the data already and can help.
I don`t want to buy a new sensor, I don`t need this part
on my car anymore.

Falk
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87 930 bblk/blk
88 3.6 white/blk
Old 02-19-2009, 07:23 AM
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Location: Central Washington State
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Just to clarify what you're looking for: The boost sensor (that inputs a signal to the dash mounted gauge?
Are you looking for a map of resistance changes as the sensor is exposed to variations in boost pressure (assuming that's how these things work)?
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 02-19-2009, 05:16 PM
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0.0 Bar 5 - 13 Ohms
0.9 Bar 117 - 129 Ohms

Measures on a original 1980 sensor. I belive the curve is linear but why I didn't record that I don't know.

Jim
Old 02-19-2009, 05:47 PM
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Quote:
Originally Posted by mark houghton View Post
Just to clarify what you're looking for: The boost sensor (that inputs a signal to the dash mounted gauge?
Are you looking for a map of resistance changes as the sensor is exposed to variations in boost pressure (assuming that's how these things work)?
exact that is what I am looking for.
I tryed to do this by myself, but as said above,
my boost sensor do not change resistance under boost.

Thank you Jim, I saw your nubers while I searched here.
I don`t think the sensor has a linear curve.

I am in contact with VDO for the curve, but they are slow.

Falk
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87 930 bblk/blk
88 3.6 white/blk
Old 02-19-2009, 10:23 PM
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Join Date: Jun 2005
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When you say you have no change under pressure is the measured resistance a value, zero or infinity? What are you using for a pressure source?

I measured mine to see if it was worth using as the source for a digital boost gauge and it is not as the sensor maxes out a .9 bar. I used a pressure regulator and a digital pressure instrument. I believe I didn't do a curve after discovering the sensor maed out at .9

Mine being old was very dirty (resistance wise) especially at the lower end. That's why the measurements are given as a range. I attributed that to age and wear.

If you get a curve from VDO please post it or send it to me in a PM. I'd like to have it on file.

Good luck.

Jim
Old 02-20-2009, 06:22 AM
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hello Jim,

the measured resistance was ~zero with a mechanical
multimeter.
I used a pressure regulator + mechanical pressure gauge.
Pressure source was the companys compressor.

I will get a second boost sensor next days to check what was wrong.

Even with my good contact to VDO, I am not sure if they have the
characteristics available.

When I have the data, either measured by myself or VDO data,
I will post them here.

Maybe someone here has time and equipment to measure
the boost sensor characteristic to compare later?

Falk
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87 930 bblk/blk
88 3.6 white/blk
Old 02-20-2009, 08:58 AM
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