I've had an EGT gauge mounted about 2" from port 1 of the cylinder head for a week now. These actual readings compare pretty well to those calculated by the PCM. I have a 50 trim turbo which may or my not effect the PCM determined EGT temperature.
Autometer EGT reading Interceptor EGT reading from PCM
750 (idle) deg F 950 deg F
1050 1125
1200 1275
1300 1400
1400 1500
1550 1650 (WOT)
Once the actual got over 1000 deg F the difference between the two was a fairly constant 100 deg. I don't know exactly where the PCM is determining the temperature, perhaps at the cylinder exit of combustion chamber. I'll be interested to see if the stock turbo readings are closer.
Just wondering....but how does the PCM read EGT? What sensors does it use to calculate the EGT, since it doesn't actually have an onboard EGT sensor?
There's very limited information on this parameter. Best I can tell is that is a calculation the SRT engineers developed based on data they collected from the various sensors in the car. It seems pretty accurate, or at least very consistent.
For those of us who stick to mopar plug n play kits, it will be damn accurate.
If you're using some other whack kit, You'd better use a real EGT gauge..
Is it the job of SRTforums members to make crap up? Being 100º off IS NOT ACCURATE. 5º off would be accurate. At least it is wrong on the high side. Also if you are only using mopar plug n play kits you don't need to know your EGT's, you can't tune anything even if you find something.....
For those of us who stick to mopar plug n play kits, it will be damn accurate.
If you're using some other whack kit, You'd better use a real EGT gauge..
Is it the job of SRTforums members to make crap up? Being 100? off IS NOT ACCURATE. 5? off would be accurate. At least it is wrong on the high side. Also if you are only using mopar plug n play kits you don't need to know your EGT's, you can't tune anything even if you find something.....
So whats your point? You're obviously responding to me, since you quoted me. I said you're better off using a real gauge if you're using the whack kits...same thing you said right???
Did I every say its accurate? So why are YOU SCREAMING AT ME?
Keep in mind my testing was done with an Autometer analog EGT gauge. I have not seen an accuracy spec on this unit. I also have not seen any information on where this PCM determined EGT temp is supposed to be, at the exit of the head, 1, 2, 3" from the collector? The real temp may fall somewhere in the middle. My guess is that Dodge uses a look-up table to determine the EGT, and will be most accurate with the stock turbo. I tested with a 50 trim.
Bottom line, as with any EGT sensor, the user has to determine what's ideal for his car. With the variety of sensor placements I've seen (before and after turbo for example), and well as different gauge manufacturers and accuracies, there is no absolute answer for everybody's car. I do know that the PCM EGT value is at least very consistent, much faster reacting than the actual EGT, and reacts appropriately. As I lean out the fueling the EGT goes up. At lower boost, the EGT goes down if fueling stays the same.
I'm hoping others with EGT sensors will report findings here as well. With enough data we'll realize just how accurate/useful this parameter is.
Todd
Quote: Originally Posted by dodgez
Quote: Originally Posted by 19 psi
Personally i would'nt care if EGT's were not exact, i would still like to see um on the gauge...... I mean those numbers above are not that far off...
what? 1550 or 1650 that's a big difference and could mean the difference between a good run and new ash tray (if there is enough piston left)
so, now that we can get EGT's...what's considered "normal"? I am on stock turbo with 2 mods - 3" turbo back maxxfab STE with cat and muffler and an ED "wuss" intercooler.....I'll try and keep track of this as I drive, but wondering what I should expect - where is the "danger-zone"? Maybe have the shift light blink like crazy if EGT's are over a set-point?
Received my upgraded Aeroforce gauge back in 6 days and I'm impressed with the new features. I run a stage 3R turbo which has been modded with a 50 lb/min compressor wheel and my egt's appear to parallel your test results. I would venture to say we'll see the same results on a stock turbo car as we have seen about the same results on a stage 2 car.
2005 Import Wars Slick Class Champ New England Dragway 2006 SRT Nationals Champ Heartland Park Topeka Kansas 2006 Class Winner Englishtown New Jersery 2006 Top Eliminator Englishtown New Jersery
2003 Flame-Red SRT-4 BEST TIME:11.62 Best MPH: 122 Best 60': 1.673 MODS: Darrell Cox Racing Built.
BTW I did not invent this #. A birdie once told us that #
From what I rememmber of metallurgy.
color of steel;
Dull red only seen in the dark @950 degF
Deep red more visable 1110 degF
Deep bright red 1382 degF
Bright Red Glow 1560 degF
Light Red glow 1650 degF
Orange glow 1830 degF
Yellow glow 2000 degF
Yellow / White Glow 2300 degF
Melting point of steel is 2500 F.
So the question would be... Are those Bright Orange underglow lights or is that your down pipe?
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EGT testing
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