"Better than 9C1" oil pressure sender mod... - Chevy Impala SS Forum
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post #1 of 19 (permalink) Old 05-23-2001, 10:18 PM
HuSSker
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I originally posted this in the engine section, but since no one replied there, I figured the Caprice folks might be interested, since this applies to all 3 years, maybe more, I'm not sure....

I was going over the schematics in the back of my Haynes manual for '88-'94 Chevy pickups, I have an '88, and I noticed that the connector for the oil pressure sender was the same as the B-body. I then remembered that Chevy pickups for those years had a 60PSI guage in them. All of the LT1 Corvettes I have seen have an 80PSI guage in them, and the last one I rode in, the pressure sat at about 40PSI all of the time while driving. Based on the assumptions that GM guages are 12 volt guages, and that 40 PSI on a 80PSI guage would be around 6 volts, I figured 40PSI on a 60PSI sender would be at about 8 volts. I had installed the low reading 9C1 one in mine a while back, so I took the plunge, bought the pickup one for MadMav's car, which still had the oil pressure switch, and let fate take it's course. I took out the 68 ohm resistor, per instructions from the Impala home page, and went to put the sender in. Unfortunately, in order for it to fit, I had to get a 1/4" female to 1/8" male pipe thread adapter to put it in place of the stock switch. Anyhow, winding up this long post, his car with 166K miles, Idled cold at 3/4, and driving it as it warmed up it slowly dropped to the low side of the "normal" "U" shaped area on the guage. When idling warm, and in drive, it would drop to about 1/3 on the guage.(about 20 PSI) Better yet, it showed with far more detail, pressure changes with engine speed, than my 9C1 sender! If anyone is interested in this mod, I can round up the part # for the sender. MadMav is really happy with the mod, and we thought maybe some of you out there would be too!


Lance
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post #2 of 19 (permalink) Old 05-24-2001, 03:42 AM
lambdapro
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I'm interested in the part number.
post #3 of 19 (permalink) Old 05-24-2001, 12:56 PM
HuSSker
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The sender part # is 12553175, and I got it for $25.73 at my dealer. I picked up the adapter at Advance auto for $1.49, or something like that. I also forgot to mention to put some type of sealing compound on the male end of the adapter before putting it in. After installing the sender, and removing the resistor in the dash, it's plug&play. Try not to get too annoyed by the tape that is used to wrap the wire harness in the dash...It's sticky as hell! All in all, the job shouldn't take more than an hour if it's your first time getting into the dash. Oh, and one more thing--They make a socket that fits the sender, I have one, but I think I read somewhere that an 1 ?/? deep well socket could get you by.


Lance
 
post #4 of 19 (permalink) Old 05-25-2001, 12:49 PM
AutocroSSer
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Socket is either 1 1/16" or 1 1/8" (forget which), deep well, 6 point.

Used it on my car to remove (and replace) the stock sender when I "T-ed" in my Autometer aftermarket sender, worked fine.

Ed
post #5 of 19 (permalink) Old 05-25-2001, 09:23 PM
Mike454SS
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What about us 9C1 guys, do I just need to replace the sender and not worry about any resistors or anything, I'd like a more accurate gauge, and I'd like it to respond to RPM changes better than the 9C1 sender which is sometimes sluggish and/or jumpy.
post #6 of 19 (permalink) Old 05-25-2001, 10:28 PM
HuSSker
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Yep, that's it... I forgot to mention 9C1's are exempt from having to pull their dash apart. Just take out the old sender, and replace w/one listed in my 1st post+adapter, and guage will then read from 0-60 psi, instead of 0-80. To give you an idea of how much better indications it gives of pressure, if you change pressure from 20 psi at idle to 45 psi while driving, the 9C1 sender pushes the guage from 1/4, up to just barely past 1/2 way up the guage. with this sender, it pushes the guage from 1/3, up to 3/4. If you're used to the 9C1 sender, like I am, this should be a very refreshing change.


Lance
post #7 of 19 (permalink) Old 05-25-2001, 10:54 PM
MadMav
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I love this mod! I constantly want/need to know what the engine is doing at all times. In idle, or at high speeds. The deflection with the 60PSI sender is so much more accurate, you have to get it. You can even compare oil viscosity after driving for extended periods of time, or the difference in oil pressure between say 55 MPH or 130 MPH. Found that out today, (My pressure drops down about 4PSI at high speeds). I'll just say that it is well worth the time and money.
post #8 of 19 (permalink) Old 05-27-2001, 02:19 PM
Steve D
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Besides the obvious "need a pressure guage" what would I need to do to install this on my 96 Imp?
post #9 of 19 (permalink) Old 05-27-2001, 07:05 PM
HuSSker
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Hmmm..... Good question, Steve. I have spent very little time around '96's, so the only way I could tell you if it would work, or not, would to look at the oil pressure sender connector. If it has 3 wires, it should, you'd just have to track down the wiring in the dash. If not, then I would assume that some fabbing would have to be done. I will research this tonight, and see if I can get an answer for you by tomorrow, if not sooner. [img]smile.gif[/img]

Lance
post #10 of 19 (permalink) Old 05-27-2001, 07:07 PM
HuSSker
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By the way MadMav, slow that damn thing down before it loses more than just 4 psi!

Lance
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