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900 APC Pressure Sensor
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Posted by Calvin Morrison [Email] (more from Calvin Morrison) on Fri, 1 Jul 2022 14:59:05 Share Post by Email
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Hello,

As you know our APC systems have just a few components. A knock sensor, the solenoid, the ECU brain and the tranducer. Did I miss any? I don't think so. I searched pretty far and wide for a well priced transducer that didn't look totally beat up, for a sane price too...

Anyway, my transducer has failed, so my APC was not operating correctly. I have been doing some research into the transducers to find another one.

Essentially the pressure transducers are mechnical-pots that adjust resistance based on a wiper arm inside the transducer (took the old one apart, very cool).

This tranducer was manufactured by VDO under a bunch of names. I figured it out because it looks like an oil pressure sender. Because it is, basically, with a vacuum niple.

Unfortunately, VDO does not manufacture these anymore from what I can see - because they run from 0-1.5 Bar. They do manufacture 0-2 Bar sensors which you could use as a substitute but your resistance would be off. That actually might be OK if you were running super high boost. Remember, it's an resistor in series with one of the pots in the APC you know about already if you've tweaked your APC.

Now, this was sold under a few different names. Porsche sold an boost pressure gauge that fits the exact shape and description of the transducer itself (not the bracket), under a different part number. Masterati sells an identical one as well - incuding the bracket for their... ABC system, which we know is APC rebadged under Maserati. It also is a 0.1-5 bar oil pressure sender type (with a vacuum nipple) from VDO. I found these under "Maserati BiTurbo Pressure Transducer"

So... that's what I got, ordered a Maserati transducer off of ebay and it seems to be working fine.

In the future, if people care enough to replace their transducers and aren't able to source a replacement manufactured by VDO they could possibly use a 0-2 bar ( I did not test this), and adjust their pot, or use a 0-2 bar and use a meter match or other fuel-sender resistance adjuster. They manufacture MeterMatch specifically because old senders dont match the resistance of new senders, so if you want to tweak the level on your dash for your fuel level, you sort of create a map from high to low. This would probably work for this application as well, since its the same principle.

If anyone had a source on more 0-1.5 Bar VDO pressure senders under different names, I'd be interested!

if this information is totally incorrect, I'd be interested!

Cheerio,
Calvin

posted by 98.114.250...


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