Testing AIS with SXE
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,348
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From: Lake Hartwell, GA
I forgot to add that all of the screenshots taken at any speed other than zero were on cruise control. The 55 MPH shots were in 4th gear and the 65 MPH shots were in 5th gear.
I use control almost all the time. I know some don't like it, but I enjoy it.
I have a 205 thermostat in the IH pump. These are common EOT readings that I have seen for the past 7 years in hot summer weather like we are having now.
No noticeable difference in EGT, boost or acceleration between 80HP and 65HP. Hydra is now set to 65HP and that is where it will stay.
I use control almost all the time. I know some don't like it, but I enjoy it.
I have a 205 thermostat in the IH pump. These are common EOT readings that I have seen for the past 7 years in hot summer weather like we are having now.
No noticeable difference in EGT, boost or acceleration between 80HP and 65HP. Hydra is now set to 65HP and that is where it will stay.
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Lead Driver
Joined: Jul 2017
Posts: 6,854
Likes: 2,331
From: WV
Interesting info Sous. I was surprised to see IAT around 130 while moving down the road. Normally it tends to balance out with ambient while at cruise speed even with the 6637.
Wish I could find the MAT on my CTS. Been wanting to get an eye on that reading for years just out of curiosity.
I used to just zip tie the IAT sensor to something behind the 6637 but I got fancy during the install the other day.
Since I’m using the old base I was able to drill a hole in the backside and add a couple notches. This allowed me to put the IAT sensor right into the plastic base very similar to the original setup. Probably not worth the trouble but I was feeling extra creative.
One “concern” over the placement could be a false lower reading since it will likely be seeing more of the cooler frontal air as opposed to the warmer air the filter will be sucking from up above.
Wish I could find the MAT on my CTS. Been wanting to get an eye on that reading for years just out of curiosity.
I used to just zip tie the IAT sensor to something behind the 6637 but I got fancy during the install the other day.
Since I’m using the old base I was able to drill a hole in the backside and add a couple notches. This allowed me to put the IAT sensor right into the plastic base very similar to the original setup. Probably not worth the trouble but I was feeling extra creative.
One “concern” over the placement could be a false lower reading since it will likely be seeing more of the cooler frontal air as opposed to the warmer air the filter will be sucking from up above.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
When I measured IAT with 6637, the sensor was zip tied directly to the filter.
I generally zip tie it to relay bases right behind filter. I suspect the sensor location makes a difference.
I generally zip tie it to relay bases right behind filter. I suspect the sensor location makes a difference.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,348
Likes: 5,941
From: Lake Hartwell, GA
I believe the sensor location makes a difference on the reading as well. I would say that my IAT sensor has very little to no air flow around it due to the plastic cylinder and the dead air space under the fuse panel.
The AC was blasting as well, so I am sure that contributed to the temperature reading.
As you can see, there was very little to no difference between IAT and MAT, which is what I expected to see.
WV Jason, I don't know anything about CTS, but I would think MAT was there somewhere...
The AC was blasting as well, so I am sure that contributed to the temperature reading.
As you can see, there was very little to no difference between IAT and MAT, which is what I expected to see.
WV Jason, I don't know anything about CTS, but I would think MAT was there somewhere...
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Lead Driver
Joined: Jul 2017
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From: WV
I believe the sensor location makes a difference on the reading as well. I would say that my IAT sensor has very little to no air flow around it due to the plastic cylinder and the dead air space under the fuse panel.
Yes it sounds like yours is not getting much flow at all. My new location may not be the greatest but I liked the “factory” style setup, or at least the concept of it. If we really wanted to get fancy we could plumb it into the intake tube....but then the wire wouldn’t reach. Never mind. I don’t think it’s a big deal anyhow. Does the PCM use the signal for much control or is it more of a gee whiz kind of signal? Same question with the MAT?
The AC was blasting as well, so I am sure that contributed to the temperature reading.
As you can see, there was very little to no difference between IAT and MAT, which is what I expected to see.
Yes very little difference. But you were also having falsely elevated IAT readings from sensor placement I believe. I feel like your actual IAT was more likely around 100*. So we are probably looking at a 30* increase even after intercooler. I have no idea what is normal here. I would expect the MST to have a higher increase in temp than the SXE.
WV Jason, I don't know anything about CTS, but I would think MAT was there somewhere...
One would think. I have the 1st version CTS so maybe it doesn’t have as many options. You would think it would have tha ability to display any PCM channel. It really doesn’t have that many to choose from. I would consider eventually updating to the CTS 2 or 3 if it has more channels.
Yes it sounds like yours is not getting much flow at all. My new location may not be the greatest but I liked the “factory” style setup, or at least the concept of it. If we really wanted to get fancy we could plumb it into the intake tube....but then the wire wouldn’t reach. Never mind. I don’t think it’s a big deal anyhow. Does the PCM use the signal for much control or is it more of a gee whiz kind of signal? Same question with the MAT?
The AC was blasting as well, so I am sure that contributed to the temperature reading.
As you can see, there was very little to no difference between IAT and MAT, which is what I expected to see.
Yes very little difference. But you were also having falsely elevated IAT readings from sensor placement I believe. I feel like your actual IAT was more likely around 100*. So we are probably looking at a 30* increase even after intercooler. I have no idea what is normal here. I would expect the MST to have a higher increase in temp than the SXE.
WV Jason, I don't know anything about CTS, but I would think MAT was there somewhere...
One would think. I have the 1st version CTS so maybe it doesn’t have as many options. You would think it would have tha ability to display any PCM channel. It really doesn’t have that many to choose from. I would consider eventually updating to the CTS 2 or 3 if it has more channels.
Cargo Master
Joined: May 2018
Posts: 2,442
Likes: 993
*Stands up from sitting in a circle*
Noob: Hello everyone. My name is Noob and my addiction is PMS.
Everyone: Hi Noob. *golf clap*
https://youtu.be/N1EhXF1lskA
Awesome. Thank you sir. You have obviously done a deep dive on this. How has the 11+0 been performing for you?
Noob: Hello everyone. My name is Noob and my addiction is PMS.
Everyone: Hi Noob. *golf clap*
https://youtu.be/N1EhXF1lskA
Awesome. Thank you sir. You have obviously done a deep dive on this. How has the 11+0 been performing for you?
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Lead Driver
Joined: Jul 2017
Posts: 6,854
Likes: 2,331
From: WV
So I’m not sure what the PCM does with the IAT and MAT readings. Started wondering how much they would impact things.
For example I know our trucks like OEM sensors, but for the MAT replacement I went with the parts store version. At the time I didn’t think the PCM really used it to make many decisions so figured it didn’t matter.
Can someone point me to a thread on the subject or give me the quick explanation please?
For example I know our trucks like OEM sensors, but for the MAT replacement I went with the parts store version. At the time I didn’t think the PCM really used it to make many decisions so figured it didn’t matter.
Can someone point me to a thread on the subject or give me the quick explanation please?
Got Data?
Joined: Dec 2012
Posts: 4,245
Likes: 1,374
From: Lake Stevens, WA
From the MAT pdf attached: A MAT sensor is used to measure intake air temperature after being cooled through the intercooler, used to determine injection timing.
Some info on both IAT and MAT from @cookie88 in the thread below:
https://www.ford-trucks.com/forums/6...t-fueling.html
Some info on both IAT and MAT from @cookie88 in the thread below:
https://www.ford-trucks.com/forums/6...t-fueling.html
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Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Its Comin Right for us!
Joined: Feb 2005
Posts: 12,144
Likes: 2,631
From: GA
So I’m not sure what the PCM does with the IAT and MAT readings. Started wondering how much they would impact things.
For example I know our trucks like OEM sensors, but for the MAT replacement I went with the parts store version. At the time I didn’t think the PCM really used it to make many decisions so figured it didn’t matter.
Can someone point me to a thread on the subject or give me the quick explanation please?
For example I know our trucks like OEM sensors, but for the MAT replacement I went with the parts store version. At the time I didn’t think the PCM really used it to make many decisions so figured it didn’t matter.
Can someone point me to a thread on the subject or give me the quick explanation please?
More Turbo
Joined: Oct 2009
Posts: 655
Likes: 18
From: Randolph County NC
Several years ago at what I think was one of Bean's first blackout in the country events, a 7.3 with AIS was doing a dyno run. It was a tuned truck with 38r turbo big exhaust but stock injectors. Someone filmed the stock hose going from AIS to turbo collapsing on acceleration. It collapsed and then regained its form very quickly. Could that be an explanation for black smoke and then clearing? It was also talked about as a oil consumption issue and the rash of blown off boots on the I.C. piping. It was posted on D.S. but I can't find it anymore.
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Lead Driver
Joined: Jul 2017
Posts: 6,854
Likes: 2,331
From: WV
From the MAT pdf attached: A MAT sensor is used to measure intake air temperature after being cooled through the intercooler, used to determine injection timing.
Some info on both IAT and MAT from @cookie88 in the thread below:
https://www.ford-trucks.com/forums/6...t-fueling.html
Some info on both IAT and MAT from @cookie88 in the thread below:
https://www.ford-trucks.com/forums/6...t-fueling.html
Several years ago at what I think was one of Bean's first blackout in the country events, a 7.3 with AIS was doing a dyno run. It was a tuned truck with 38r turbo big exhaust but stock injectors. Someone filmed the stock hose going from AIS to turbo collapsing on acceleration. It collapsed and then regained its form very quickly. Could that be an explanation for black smoke and then clearing? It was also talked about as a oil consumption issue and the rash of blown off boots on the I.C. piping. It was posted on D.S. but I can't find it anymore.
However what I’m seeing is the AIS has LESS smoke than the 6637. This I cannot explain. 
Granted it is not at wide open throttle. We’re talking 50mph cruise to a half throttle acceleration. Basically the smoke and then clearing is because at that particular rpm it is slightly under the turbo but the auto doesn’t kick down when accelerating. So it smokes a little, spools up, and clears up. But what you’re taking about could explain the pulled in FM with the AIS under hard acceleration runs.
I’m really tempted to open the AIS box to the fender and test some more. But at this point I’m hoping to wait until some real towing with the current 6637 setup. My battery terminals have been getting a workout with all these changes.
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Lead Driver
Joined: Jul 2017
Posts: 6,854
Likes: 2,331
From: WV
I know there’s been tons of people do the fender mod but I’ve never seen where it definitively flowed more with the mod.
If I could get the AIS to work for 95% of my driving conditions then I think it’s worth it. Honestly I don’t give a hoot about how it flows with the 140hp tune or on a drag race run. But if it will keep up with a 65 tow tune even when pulling hard then I’m sold. I’d settle for no more than 50% on the FM under the hard tow. Shoot my MST would do that.
Anyone else have an AIS laying around and want to play too? Throw it on with the SXE and tell us what you think.
