How does the DIC determine oil % ?
Le Mans Master
Joined: Oct 2001
Posts: 6,710
Likes: 2
From: Southern California
Re: How does the DIC determine oil % ? (ZAP)
My guess: revolution count. The harder you drive, the more RPM's, the faster oil life diminishes. There's gotta be some kinda fudge factors for temperature and time, too, but the basic metric is revolutions, i.e. at high temperatures, each rev is multiplied by some greater than one scaling number, after so many number of hours of operation, some calculated number of revs is added to the revolution count.
Just a guess...
Just a guess...
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Re: How does the DIC determine oil % ? (ZAP)
I remember reading some of the parameters in the shop manual but it's been awhile. Some are, temp.,time,mileage,etc. My DIC (er, Johnson Readout) was averaging 3000 mi. to 50% reading. Since that's when I changed oil, I chose to use 50% as my personal "0%". :)
Drifting
Joined: May 2001
Posts: 1,499
Likes: 0
From: Cincinnati OH
Re: How does the DIC determine oil % ? (Tx99FRC)
I remember reading some of the parameters in the shop manual but it's been awhile. Some are, temp.,time,mileage,etc. My DIC (er, Johnson Readout) was averaging 3000 mi. to 50% reading. Since that's when I changed oil, I chose to use 50% as my personal "0%". :)
I had heard that the computer takes into account engine temp, length of trips, average speeds (city vs hwy), and mileage to determine the distance between oil changes.
-Jim
Race Director
Joined: Aug 2000
Posts: 17,992
Likes: 280
Re: How does the DIC determine oil % ? (ZAP)
My average is about 3700 miles when it sets the indicator light @ 10%
I have tested the oil 3 times at that point and its still good :cheers:
GM knows a thing or two about a thing or two! The only thing it doesn't take in account is dust. Its always raining here so that is a non-issue in the winter!
Joel
I have tested the oil 3 times at that point and its still good :cheers:
GM knows a thing or two about a thing or two! The only thing it doesn't take in account is dust. Its always raining here so that is a non-issue in the winter!
Joel
Safety Car
Joined: Sep 2001
Posts: 4,411
Likes: 1
From: Wilmington NC
Re: How does the DIC determine oil % ? (ZAP)
Anybody know? What's the average miles between 100% and 0% ? :cheers:
Le Mans Master
Joined: Oct 2001
Posts: 6,710
Likes: 2
From: Southern California
Re: How does the DIC determine oil % ? (ZAP)
I knew those years of engi-nerd-ing school weren't totally useless...
from http://www.grandprix.net/cgi-bin/97.cgi?file=123.txt :
...the '98 shop manual (page 6-1560) says the PCM calculates
remaining oil life based on total engine revolutions AND calculated engine
oil temperature for each startup since the oil life monitor was reset...
Actually, I make my living writing software, nowadays mostly real-time embedded software. Usually, you want this stuff to be simple, so just counting revolutions has to be the main metric. If I were writing the software, I would assume mileage would figure very little or nothing in calculating engine oil life. You can sit in traffic for hours at a crawl and record small amounts of mileage. Mileage is not an accurate profile of engine oil use. Or at least not as accurate as keeping track of engine revolutions and temperature, which to me, portray a much more accurate picture of engine use. But don't take my word for it. I know nothing about GM software, so I am pretty much talking out of my somewhat educated butt. :lol:
from http://www.grandprix.net/cgi-bin/97.cgi?file=123.txt :
...the '98 shop manual (page 6-1560) says the PCM calculates
remaining oil life based on total engine revolutions AND calculated engine
oil temperature for each startup since the oil life monitor was reset...
Actually, I make my living writing software, nowadays mostly real-time embedded software. Usually, you want this stuff to be simple, so just counting revolutions has to be the main metric. If I were writing the software, I would assume mileage would figure very little or nothing in calculating engine oil life. You can sit in traffic for hours at a crawl and record small amounts of mileage. Mileage is not an accurate profile of engine oil use. Or at least not as accurate as keeping track of engine revolutions and temperature, which to me, portray a much more accurate picture of engine use. But don't take my word for it. I know nothing about GM software, so I am pretty much talking out of my somewhat educated butt. :lol:
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Team Owner
Joined: Sep 2000
Posts: 25,015
Likes: 2,709
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Re: How does the DIC determine oil % ? (Dave68)
Mine took about 3,000 miles to get down to 50% life remaining when I was driving a mix of local and highway; but a long road trip, even with lots of floor-it passing, cruising at 110, etc took 8,000 to get down to 50%.
