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Old 12-09-2009, 10:31 PM   #1
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Question Per cylinder EGT monitoring

On the track beastie I want to monitor EGT's on all 4 cylinders.

Has ANYone done this before?

If so, how did you monitor them?

AEM has the 4 channel amp that can drive 4 simultaneous 0-5 volt outputs, but I would also like to have them output to a gauge. The AEM serial gauge is nice, but it requires their EMS and I am using a Hydra.

Ultimately I would like a bright-**** red LED to flash or light up when I exceed say 1700*f. I suck @ electronics, but I am assuming I could find out from the sensor manufacturer the temp --> volt calculations and then take it to someone to rig up some sort of electronics board that would fire a signal to an LED, but that is all voodoo and I would rather find some sort of gauge that can monitor all 4 signals simultaneously. Aside from that AEM serial gauge, are there any other options?

Thanks,
Mike
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Old 12-09-2009, 10:53 PM   #2
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Innovative has a 4 channel data logger that I believe can take the inputs you want at the very least. i know it can display any one of them, but not sure it can do all 4 at once, or an alarm for high temp on any one of them. Might be worth a call to ask.
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Old 12-09-2009, 10:57 PM   #3
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You mean a gauge like this?



This one is a CHT/EGT gauge but Westach makes a 2 1/4" quad EGT gauge.

Here's their website: Westach
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Old 12-10-2009, 03:45 AM   #4
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OMG that is awesome Bill.

Mike, might you consider getting a buzzer wired into that fancy do-dad circuit as well. I know i am not always looking at my cluster (or gauges for that matter) when i drive. My next plan is wireing an "oh **** your oil pressure is too low" buzzer/light into my 90.
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Old 12-10-2009, 04:03 AM   #5
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Quote:
Originally Posted by thesnowboarder View Post
OMG that is awesome Bill.

Mike, might you consider getting a buzzer wired into that fancy do-dad circuit as well. I know i am not always looking at my cluster (or gauges for that matter) when i drive. My next plan is wireing an "oh **** your oil pressure is too low" buzzer/light into my 90.
you know what would be even cooler! is if it wasnt a buzzer and it was actually "OH **** YOUR OIL PRESSURE IS TOO LOW" being screamed at you!!!......
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Old 12-10-2009, 05:10 AM   #6
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Reverant has 4 widebands and 4 pyrometers. One at each cylinder.
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Old 12-10-2009, 06:19 AM   #7
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The audible and visual alarm is exactly what I am looking for, the only problem is it requires their WB meter and it only supports a single EGT input, although possibly 2 additional analog inputs. 3 out of 4 aint bad, but...

Zeitronix Audio-Visual Warning and Trigger Box ZAVT-1
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Old 12-10-2009, 08:18 AM   #8
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You can also get a digital gauge that will just show the highest of the 4, rotate through them, or let you just select one. Screw around in ebay's aviation section. Bunch of egt stuff in there.

http://cgi.ebay.com/ebaymotors/Aircr...item4cec753b96
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Old 12-10-2009, 10:36 AM   #9
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I just bought a multi gauge with alert capability from forum member dustinb.

These here:

PLX Devices Inc. - Multi Gauges, Single Gauges, Sensor Modules, Wideband Air Fuel Ratio, Data Logging, Fuel Saving / Scan Tools

You can have 4 egt sensors and have them displayed simultaneously. You can set overtemperature or undertemperature alerts that will flash "warning" on the screen. You can also get 0-5v output from the gauges.

I bought them because of the alerting capability. I'm going to be using one gauge for oil temp, oil pressure, and water temp. If any sensor value exceeds the threshold I'll get alerts.

I also have a dual EGT guage-- a somewhat mediocre analog gauge from FM manufactured by Westach. See my build thread for pics. The thermocouples and wires from Westach were very expensive. It should be well worth it though for when I tune my WI.

One last note: I have a log manifold and have never seen more than 100 degrees difference in EGTs between cylinder 1 and 4. When under boost, the differences are slight. If you have a tubular manifold you might see a larger delta between the runners due to complete gas separation. If accurate EGT data is important to you, it might be worth upgrading to a tubular (if you don't have one already).
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Old 12-10-2009, 11:52 AM   #10
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Its a pretty common thing on aircraft, Im sure you could pick up used systems for pretty decent prices. Although the new ones arnt really that bad either
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Old 12-10-2009, 12:09 PM   #11
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You will need a thermocouple amp circuit to amplify the thermocouple output.
I built such a circuit, single channel.

$10 in parts per channel
Digi-Key - LTK001CN8#PBF-ND (Manufacturer - LTK001CN8#PBF)
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Old 12-10-2009, 12:14 PM   #12
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Why limit yourself to just an alert? My oil pressure plan was going to be to feed the input into the ecu and STOP the engine on a low oil pressure condition. For EGT's couldn't you adjust timing or boost?

Just sayin' saving the motor > flashing a light.
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Old 12-10-2009, 12:37 PM   #13
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Quote:
Originally Posted by Chris Swearingen View Post
Why limit yourself to just an alert? My oil pressure plan was going to be to feed the input into the ecu and STOP the engine on a low oil pressure condition. For EGT's couldn't you adjust timing or boost?

Just sayin' saving the motor > flashing a light.
What happens when the engine shuts off mid-corner for a little oil slosh...

flashing light > off track backwards
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Old 12-10-2009, 01:23 PM   #14
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Quote:
Originally Posted by faeflora View Post
One last note: I have a log manifold and have never seen more than 100 degrees difference in EGTs between cylinder 1 and 4. When under boost, the differences are slight. If you have a tubular manifold you might see a larger delta between the runners due to complete gas separation. If accurate EGT data is important to you, it might be worth upgrading to a tubular (if you don't have one already).
Thanks for the info - yes I am going with Tim's Absurdflow V-band madness turbo system
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Old 12-10-2009, 01:31 PM   #15
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Semi related...why did you switch from the AEM EMS to a Hydra? Especially now that you could use the 4 EGT's to trim fuel as well as do what you want it to, in terms of buzzers or displays.
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Old 12-10-2009, 01:32 PM   #16
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Quote:
Originally Posted by Rennkafer View Post
What happens when the engine shuts off mid-corner for a little oil slosh...

flashing light > off track backwards
Yeah, that would NOT be good. I am adding an accusump so finger-crossed, this won't happen to me. I'm also installing the Boundary high flow oil pump... every little bit helps.

Quote:
Originally Posted by TurboTim View Post
Semi related...why did you switch from the AEM EMS to a Hydra? Especially now that you could use the 4 EGT's to trim fuel as well as do what you want it to, in terms of buzzers or displays.
I actually still have the AEM and am planning to put it back on Minime for street and perhaps backup track use. When I bought the BRG it had a link, which I sold with the old turbo system. I contemplated using the AEM on the BRG, but I didn't like the intermittent ignition miss event(that freaks me out) and I really suck at tuning and there is nobody locally that can help me tune the AEM. I like the integrated WI control of the Hydra(I have an Aquamist HFS5, same as the hydramist kit), but I want good vendor support(FM) and the Hydra is also supported by the RT DL-1 datalogger, which I plan to integrate eventually. At the time, the AEM was not supported, but I think they just added support for it.

Last edited by minime; 12-10-2009 at 01:56 PM.
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Old 12-10-2009, 01:39 PM   #17
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Quote:
Originally Posted by minime View Post
Yeah, that would NOT be good. I am adding an accusump so finger-crossed, this won't happen to me. I'm also installing the Boundary high flow oil pump... every little bit helps.
Which accusump are you using and what accessories are you setting it up with? Where are you going to mount it? I thought about the accusump for pre-oiling but it will add a lot of complexity (and cost) to my setup.
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Old 12-10-2009, 02:00 PM   #18
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Quote:
Originally Posted by faeflora View Post
Which accusump are you using and what accessories are you setting it up with? Where are you going to mount it? I thought about the accusump for pre-oiling but it will add a lot of complexity (and cost) to my setup.
I am going with the 3 quart sytem, mounting it on the pax floorpan(I won't have a pax seat) w/manual ball valve. I have an external oil cooler and Canton oil filter, but I will be upgrading to a much larger oil cooler over the winter.
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Old 12-10-2009, 02:22 PM   #19
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What is the point of an Accusump if it's not set up to autofire (or am I missing something)?
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Old 12-10-2009, 02:28 PM   #20
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Oil is added when the pressure in the accusump chamber is > than the engine oil pressure. The ball valve is just used for priming the engine on startup and of course needs to be closed before the engine is stopped so it doesn't dump the oil back into the engine, which I guess is good for doing oil changes as it would automatically dump it out of the chamber.
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