AEM Ultimate Resource Thread>>>>

[ninjadoc]

Those will not work. Do a search in the electronics forum at www.aempower.com to read the discussion on this topic.

Originally Posted by slava

Ok people with EMS.....I have a questions for you which i can't not find the answers for.
Do you use AEM two extra 0-5V inputs?
I was thinking to build cheap K-type EGT sensor converter to 0-5V output and connect (cheap Ktype EGT sensors) to extra AEM input. So i am not sure if those inputs are commonly used for something..
And second question, can the AEM be configured to use those two inputs for EGT vs the build-in EGT(RTD) inputs?
Help would be greatly appreciated.

[slava]

Originally Posted by ninjadoc

Those will not work. Do a search in the electronics forum at www.aempower.com to read the discussion on this topic.

What , INPUTS won't work?? I know that RTD is resistance/temp and K-type is voltage/temp....

I will say it again, I will build ADAPTER for K-type EGT sensors to produce 0-5V output so they can be connected to the AEM extra two 0-5v inputs.

[mjannusch]

Originally Posted by slava

What , INPUTS won't work?? I know that RTD is resistance/temp and K-type is voltage/temp....

I will say it again, I will build ADAPTER for K-type EGT sensors to produce 0-5V output so they can be connected to the AEM extra two 0-5v inputs.

The problem is that the EGT inputs on the AEM are configured to SEND +5V to the sensor and measure the current flow to determine the resistance in the RTD probe to read the temp. (At least that's how I understand it to be - I looked at the problem a while back also).

Therefore you need a device which mimics a thermistor and varies the resistance and not the voltage.

[slava]

Originally Posted by mjannusch

The problem is that the EGT inputs on the AEM are configured to SEND +5V to the sensor and measure the current flow to determine the resistance in the RTD probe to read the temp. (At least that's how I understand it to be - I looked at the problem a while back also).

Therefore you need a device which mimics a thermistor and varies the resistance and not the voltage.

Understand.
but AEM manual said AEM has two spare 0-5V input...can I use them?

[mjannusch]

Originally Posted by slava

Understand.
but AEM manual said AEM has two spare 0-5V input...can I use them?

I believe they are all configured the same way as the EGT ones are set up, unless I missed something when I was trying to figure it out. There may also be limitations as to which inputs can be mapped as "EGT" signals - not sure on that.

[Bmill]

Has anyone tested this Map sensor?
Ebay Sensor

Looking to save some cash.

[FastOldGuy]

That looks exactly like my AEM 3.5 bar MAP sensor

[Renner]

Originally Posted by slava

Understand.
but AEM manual said AEM has two spare 0-5V input...can I use them?

Yes, I have done this just the way you are saying. I used a normal K-type thermocouple with a liner 0-5 output box that I purchased through Omega. I then used a spare 0-5 volt input channel on the AEM box. You can assign the EGT voltage input to look at a different input channel then the normal RTD channels, although off the top of my head I forget which one I used.

You then input the calibration curve for the thermocouple output box for the EGT channel, this is where having a linear output box makes things easy. These boxes can be purchased ready to go, but their cost makes it not really economical compared to just buying the regular AEM EGT sensor. I was using this in an application where I had to use a very small thermocouple since space was limited, so I had no choice since the AEM EGT was too large.

[Renner]

Originally Posted by Bmill

Has anyone tested this Map sensor?
Ebay Sensor

Looking to save some cash.

AEM used Kavlico pressure sensors.

http://www.kavlico.com/pages/product...sors/index.htm

Ask the seller to give you the part number off of the sensor, if it matches the correct Kavlico sensor then you are getting the same thing, assuming that it works of course. Paying for a bad sensor off of ebay, and then having to buy another one that is actually good from a vendor who will warrenty it, of course ends up costing you more...

[slava]

Excellent, I was questioning AEM egt probe size and longevity.
Actually Analod device making termocouple conditioner chip AD597 which directly connects to termocouple, will work with 13v directly for upto 1000C and will provide linear output and it is cheap too. EGT K type sensors are pretty cheap, you can probably buy lot of 4 on ebay for 60$.
My AEM is on its way and that would be a good time to experiment with EGT on stock engine setup.
I just wasnot sure if AEM allows to select other ports to use as EGT input.
thank you.

Originally Posted by Renner

Yes, I have done this just the way you are saying. I used a normal K-type thermocouple with a liner 0-5 output box that I purchased through Omega. I then used a spare 0-5 volt input channel on the AEM box. You can assign the EGT voltage input to look at a different input channel then the normal RTD channels, although off the top of my head I forget which one I used.

You then input the calibration curve for the thermocouple output box for the EGT channel, this is where having a linear output box makes things easy. These boxes can be purchased ready to go, but their cost makes it not really economical compared to just buying the regular AEM EGT sensor. I was using this in an application where I had to use a very small thermocouple since space was limited, so I had no choice since the AEM EGT was too large.