09-10-2014, 03:32 PM | #1 |
Drives: 2011 Camaro SS2/LS3 Join Date: Feb 2011
Location: San Jose
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Oil temp gauge calculated?
I think I read on here somewhere (I can't find the thread now) that the stock oil temp gauge isn't actually reading oil temperature from a sending unit but rather is just a calculation based on RPMs, speed, etc. etc. that the computer does? Is this true?
If so, does this mean the transmission temp is also similarly calculated? Is it possible to rewire the stock gauge to attach to a real sending unit so it shows ACTUAL temperature instead of calculated?
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2011 Chevrolet Camaro SS2/LS3 - Pretty much bone stock (SLP SkipShift Eliminator, GTO clutch fluid reservoir mod) - 13.025 @ 110.492 MPH (12s?? )
1998 Pontiac Grand Prix GTP (retired) - Cam, exhaust, CAI, 12 PSI, tune - 13.465 @ 101.04 MPH |
09-10-2014, 03:39 PM | #2 |
ROAD COURSE JUNKIE
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From what I recall yes it's a pre calculated temp not an actual temp. The others are real temps.
Hopefully someone with more knowledge can chime in.
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09-11-2014, 02:59 AM | #3 | |
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Drives: 2011 2SS/RS Join Date: Jul 2011
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Quote:
Unless of course you see steam or flames rising from the engine, in which case, you should trust your instincts over the gauges. But more than likely if you do see flames, the gauges will confirm it, and you will shut down and exit the vehicle immediately.
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09-11-2014, 03:29 AM | #4 |
Drives: 2011 IOM 2SS/RS M6 Convertible Join Date: Feb 2014
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I'm curious to see where this thread goes.
I'll admit upfront that I don't really know, but I just can't imagine that the oil temp and tranny temp gauges would show anything but actual temperature read from a sending unit. Temp gauges purpose is to alert you to potential problems before they become catastrophic, I don't see how a "calculated" reading could do that. I'd like to see some confirmation one way or the other.
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09-11-2014, 11:08 AM | #5 | |
Drives: 2011 Camaro SS2/LS3 Join Date: Feb 2011
Location: San Jose
Posts: 329
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Quote:
No, I am thinking of the oil temp gauge, present in the SS2. Here is the post talking about how the oil temp is calculated rather than actually measured: http://www.camaro5.com/forums/showpo...8&postcount=12 (and specifically, here: http://forum.grrrr8.net/showthread.p...l=1#post508830) The reason I ask is that I went road racing a few weeks ago and pegged my oil temp gauge while doing so (or nearly did). I'd like to add an aftermarket oil cooler but if the oil temps coming from that gauge are estimated rather than read, I need a new gauge too. I'd rather use the stock gauge and just make it do what it SHOULD be doing.
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2011 Chevrolet Camaro SS2/LS3 - Pretty much bone stock (SLP SkipShift Eliminator, GTO clutch fluid reservoir mod) - 13.025 @ 110.492 MPH (12s?? )
1998 Pontiac Grand Prix GTP (retired) - Cam, exhaust, CAI, 12 PSI, tune - 13.465 @ 101.04 MPH |
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09-11-2014, 11:11 AM | #6 |
Drives: 2018 GT350 Join Date: Nov 2011
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Would make sense. If you pull from the sending unit, that is a localized temperature, not the bulk temperature. You'd want to use RPM, fluid flow, and temperature to allow for density corrections.
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09-11-2014, 11:33 AM | #7 | |
Drives: 2011 Camaro SS2/LS3 Join Date: Feb 2011
Location: San Jose
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Quote:
I'd rather be taking actual measurements than just letting the computer make assumptions. From the thread I linked, the computer's assumptions can be off by quite a bit in some cases.
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2011 Chevrolet Camaro SS2/LS3 - Pretty much bone stock (SLP SkipShift Eliminator, GTO clutch fluid reservoir mod) - 13.025 @ 110.492 MPH (12s?? )
1998 Pontiac Grand Prix GTP (retired) - Cam, exhaust, CAI, 12 PSI, tune - 13.465 @ 101.04 MPH |
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09-11-2014, 11:50 AM | #8 | |
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Quote:
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09-11-2014, 12:45 PM | #9 | |
Drives: 2010 RJT 2SS M6 Camaro Join Date: Feb 2011
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Quote:
And I'm sure that the answer to the second part of your question would be a big NO. Both instrument clusters in these cars are just computer modules on a serial data bus. They interpret data commands sent to them by the PCM and display them as readings on your gauges. In order to change any of this the whole hardware and software systems would have to be re-engineered.
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2010 RJT 2SS M6, Kooks Long Tubes, NPP Exhaust, CAI Cold Air w/Jannetty Scoop, RotoFab Washer Bottle, Elite Engineering Catch Can, MGW Shifter w/ZL1 Shaft and Knob, 2015 SS Sedan Steering Wheel and Air Bag, 2012 Heater Hose Conversion, 2012 Power Seat Conversion, RS Head Lights,Gen5DIY RS Conversion Harness, LED Fog Lamp Bulbs, Backup Camera Kit, NLP Spoiler, SLP Splitter, ZL1 Rockers and Diffuser, Color Matched Shark Fin, RS Roof Mouldings, Painted White Stripes, WCC LS3 Emblems, Heritage Grille and Blacked Out Tail Light Panel w/Retro SS Emblems, 416 RWHP, 411 RWT, Tuned by BlueCat.
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09-11-2014, 02:19 PM | #10 | |
Drives: 2011 Camaro SS2/LS3 Join Date: Feb 2011
Location: San Jose
Posts: 329
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Quote:
http://forum.grrrr8.net/showthread.p...l=1#post508830
__________________
2011 Chevrolet Camaro SS2/LS3 - Pretty much bone stock (SLP SkipShift Eliminator, GTO clutch fluid reservoir mod) - 13.025 @ 110.492 MPH (12s?? )
1998 Pontiac Grand Prix GTP (retired) - Cam, exhaust, CAI, 12 PSI, tune - 13.465 @ 101.04 MPH |
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09-11-2014, 02:22 PM | #11 | |
Drives: 2011 Camaro SS2/LS3 Join Date: Feb 2011
Location: San Jose
Posts: 329
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Quote:
Yes, I know it's outside of OEM functionality. I'm not quite sure what value your comment adds. If I add an oil cooler, I'd like to see ACTUAL oil temps rather than calculated ones that don't take into account that a real oil cooler has been added. The fact that GM didn't plan for it is already known to me and I'm trying to figure out a way around it.
__________________
2011 Chevrolet Camaro SS2/LS3 - Pretty much bone stock (SLP SkipShift Eliminator, GTO clutch fluid reservoir mod) - 13.025 @ 110.492 MPH (12s?? )
1998 Pontiac Grand Prix GTP (retired) - Cam, exhaust, CAI, 12 PSI, tune - 13.465 @ 101.04 MPH |
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09-13-2014, 11:37 AM | #12 | |
Drives: 2010 RJT 2SS M6 Camaro Join Date: Feb 2011
Location: Garrison,KY
Posts: 1,548
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Quote:
If all this is true and there really is an oil temp sensor with wires already ran to inputs on the PCM, perhaps the PCM could be reprogrammed to provide measured temps to the oil temp gauge rather than calculated temps. But again, if this is all true, why GM would not have programmed it that way to start with is beyond me.
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2010 RJT 2SS M6, Kooks Long Tubes, NPP Exhaust, CAI Cold Air w/Jannetty Scoop, RotoFab Washer Bottle, Elite Engineering Catch Can, MGW Shifter w/ZL1 Shaft and Knob, 2015 SS Sedan Steering Wheel and Air Bag, 2012 Heater Hose Conversion, 2012 Power Seat Conversion, RS Head Lights,Gen5DIY RS Conversion Harness, LED Fog Lamp Bulbs, Backup Camera Kit, NLP Spoiler, SLP Splitter, ZL1 Rockers and Diffuser, Color Matched Shark Fin, RS Roof Mouldings, Painted White Stripes, WCC LS3 Emblems, Heritage Grille and Blacked Out Tail Light Panel w/Retro SS Emblems, 416 RWHP, 411 RWT, Tuned by BlueCat.
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