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EGT Gauge Questions

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Dean

Senior Member
Joined
Jul 26, 2002
Messages
564
I am starting to look at EGT gauges and was wondering what others have chosen and why. Analog or digital? Peak hold? Welded bung or strap on? (Not THAT kind of strap on!!;))What else is there to consider??

Something I have wondered about - All of the EGT installations I have seen have seen have been with one probe in the #2 exhaust tube. Other than convenience, why #2? Is it reasonable to expect #2, or any # for that matter, to be representative of all six cylinders? Or is it that you just pick one and keep track of that one?

It seems the logical thing to do would be to check all 6, but perhaps that is too much, unless you have six gauges. Optionally, after looking at a few on the web, one that has caught my eye is the Electronics International Digital Six Probe, accurate to 1%. The problem is the price...$556! Yikes!! A bloody fortune compared to the Westach, but man, it looks sweet, and having one gauge cover all six pipes (selectable) is nice. I wonder if it has a peak hold feature for each probe so you can flip through the six and review?
http://www.aircraftspruce.com/catalog/inpages/ei_egt.php
 
Good questions, I just bought one from ARC (archeat.com) dual probes. Part# AR12KC. I haven't installed yet but my plan is to put one probe in the driverside header, to monitor exhaust close to the cylinder head, the other I'll put in the DP, to check all six cyl. Cost a little 213.84$ to my door 2nd day air. The K thermocouples are ss compression fittings, no clamps. Now if I can get off my a$$ and install it I'm all set.
 
Dean I used a auto meter in my car and ran it two in off the #5 port. I used the number 5 because I think 5 and 6 are the lean cylinders. Just wondering what egts the rest of you see at the port.
 
EGTZZZZ!!!:D



I bought a digital Extech single input digital from Grainger's and the SMC probe for my car. The Extech is back-lit with min/max recall and the SMC is a clamp with probe bung welded to it. In the instructions with the probe it said to drill and mount the hole as far up on the passenger header near the turbo as you can go (basically mine ended up on a 90 from the O2 sensor) on the front side of the header. Is doing singles better than a collective whole? I don't know but I follow the MFG's directions where possible:)
 
it makes no difference where you put the probe as long as you learn how your car operates.....sorta like tuning with 02's, but a bit more precise

when you get "familiar" with what the egt is telling you, you'll know what to do

I think most put the probe opposite the 02 in the header up pipe

reading individual cylinders would be nice, but what will you do with that data??? (absent the ability to set fuel by cylinder...you are still tuning to the leanest cylinder....)
 
Thanks folks. Keep 'em coming.


malibuick231, sounds reasonable. At least you are on the safe side.


Intercooler, several people have reported having their TC in the same location, opposite the O2 location.


Woody, wouldn't it be useful to know which is the leanest cylinder(s) so you can take action before a disaster? I see folks mentioning ranges of ~1600. What if one was 1200, three were at 1500, and two at 2000? I'd sure like to know if I had a couple at 2000... and what's up with that one at 1200??

I was thinking it would be good to know if you have a severely lean cylinder, indicating a problem with a bad injector, or ???. It would also be handy to know if you have a severely rich cylinder, indication a malfunctioning ignition component, or ???. Or, if there is a significant imbalance between the cylinders, indicating an air distibution problem (guess this would put a AD Power Plate to a test). I'm kinda of the mindset that once I start down a path on something, I'll take all the data I can get. Besides, who knows... my future may hold a MOTEC in it.


:-Dean
 
I agree with Jesse, I have the same guage, it works great, and is very cheap, along with the SMC probe. Nice setup for under 105 bucks :D
 
Guys, as with so many other things....it depends.
  1. Data Junkies will want Data Logging capabilities (Internal vs. External). Is software included?
  2. Backlighting is needed for reading at night.
  3. Dual input gives you more options.
  4. Max/Min/Recall/Hold
  5. Time stamping
  6. With Dual Input - Single, Dual or Triple (A-B) display.
  7. Measurement Range and Resolution.
    [/list=1]
    I am going Nerd-out and go with the new EA-15 from Extech. Just as many bells and whistles as the Fluke 54 but $70 cheaper and the software is included.:cool:
 
Thanks again, folks.

Scott, you hit on a major point that I have been looking for information on, data logging. I have seen some noting logging capabilities, but in increments of minutes.


:-Dean
 
Yup. The big hog Omega (HH2002AL-$249) will only record once per minute. Realistically, the best I have found is 1 sample per second on a handheld temperature meter (Extech, Fluke, and Omega all have these).

Considering the dual input meters with backlit screens I looked at...
If you are willing to run a laptop devoted to the temp meter (most laptops only have one RS232 port), then you can choose between:
  1. Omega HH506R - a best buy at $145+ship, or the
  2. Extech 421508 $159
    [/list=1]
    If you want Internal datalogging (meter has its own memory) that can be downloaded to a PC later, then you can choose between:
    1. Omega HH306 @ $185 - BUT does not have backlit screen,
    2. Extech EA-15 @ $229, or the
    3. Fluke 54 @ $300
      [/list=1]
 
of course it would be interesting to know the temps on all cylinders, I just wonder what one could do with the info? (absent some way to compensate.....if it is not something obtuse like a malfunctioning injector)

once you get your car base lined as to egt, you will notice if anything gets out of line right away....as you suggested, a single probe egt is reading something like an average temp out of the exhaust......which will be good enough

you could always put bung on every cylinder and move it around if you sense problems

good luck...btw, I use SMC's digital gauge w/recall
 
Now that we know what gauge everyones using what kind of egts do you see. What do you guys think is to high?
 
Originally posted by Dean
Downloadable internal is the direction I'm leaning.

BTW, I also saw an Extech #422130 J/K Thermometer Datalogger for $229 as well. I need to decipher some of the lingo, though, to figure out which I would prefer, if this is what I go with.:-Dean
Click to expand...
The 422130 is being replaced by the new model EA15. Same price but the EA 15 now offers backlighting, easier to read display, and more memory.

If you click on the CATALOG link, the 422130 isn't on any of the pages of the new catalog.
 
Originally posted by azgn
of course it would be interesting to know the temps on all cylinders, I just wonder what one could do with the info? (absent some way to compensate.....if it is not something obtuse like a malfunctioning injector)
Click to expand...
Just talked with Steve Chlupsa from SMC this week. Seems he has a 8-probe EGT setup working. Prolly closer to a grand$ but should be a trick setup when available!:cool:
 
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