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Join Date: Jun 2010
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Turbo Boost Gauge

Gauge not working.
Replaced the sending unit. It was open. The new one reads 9.4 ohms at no gauge pressure.
Dash gauge is zero when open and maxed when grounded.
Trouble is it goes right to max when I connect the gauge.
Any ideas?
Old 12-15-2011, 05:38 AM
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Ken911's Avatar
 
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Wiring is grounded probably
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Old 12-15-2011, 06:32 AM
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Here are the normal resistance values for the sender:

0.0 Bar: 5 - 13 Ohms
0.9 Bar: 117 - 129 Ohms (mine reads 112 at .8 bar)

The 9.4 ohms you're getting at zero boost falls right in the ballpark. Ken is probably right....a ground fault somewhere in the wire. Does your gauge max-out only when you plug the wire into the sender, or is it maxed even with that wire unplugged from the sender (thus taking the sender out of the equation and pointing to a possible short in the wire run up to the gauge).
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Old 12-15-2011, 07:45 AM
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It maxes out when I hook up the sender. Goes to zero when I unplug it.
Mc
Old 12-15-2011, 06:16 PM
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may be the meter in the dash then
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue
Old 12-16-2011, 04:16 AM
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I have a similar issue with my oil pressure. Reads zero, Sender over heated and is shot but when i turn on my rear window wiper it pegs high. So after i replace the sender i still have to find the bug in the wiring.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue
Old 12-16-2011, 04:18 AM
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I took the tach out and checked the wiring the ground wires are good and the wire from the sender reads the same resistance as the sender, so no ground or open there. The gauge goes from zero to max on command, but backwards.
Old 12-16-2011, 10:09 AM
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Is there more than one boost gauge? This is a grey market 1985 930.
Old 12-17-2011, 06:50 AM
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