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      06-17-2015, 09:58 AM   #1
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Charge Air Temp vs Ambient

Have ER FMIC and wondering what delta others are seeing. After handful of highway pulls per the AP the Charge Air Temp is 50 degrees F higher than ambient. Then after cool down no boost the Charge Air Temp settles back at about 30 degrees higher than ambient.

Sensor reading is same as ambient initially. And car runs fine with no codes and few timing corrections.

Looking for some feedback from others who have logged or observed this delta in the past.

Thank you.
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      06-17-2015, 12:00 PM   #2
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Quote:
Originally Posted by Fun w/N54 View Post
Have ER FMIC and wondering what delta others are seeing. After handful of highway pulls per the AP the Charge Air Temp is 50 degrees F higher than ambient. Then after cool down no boost the Charge Air Temp settles back at about 30 degrees higher than ambient.

Sensor reading is same as ambient initially. And car runs fine with no codes and few timing corrections.

Looking for some feedback from others who have logged or observed this delta in the past.

Thank you.
That seems pretty high. About 20-25F is my differential even on hot days. 7" vrsf.
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      06-17-2015, 12:02 PM   #3
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Quote:
Originally Posted by Fun w/N54 View Post
Have ER FMIC and wondering what delta others are seeing. After handful of highway pulls per the AP the Charge Air Temp is 50 degrees F higher than ambient. Then after cool down no boost the Charge Air Temp settles back at about 30 degrees higher than ambient.

Sensor reading is same as ambient initially. And car runs fine with no codes and few timing corrections.

Looking for some feedback from others who have logged or observed this delta in the past.

Thank you.
Back to back pulls or was there some time to let it cool down in between? Seems fairly high, but would also depend on the what the ambient was and what type of driving you were doing.
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      06-17-2015, 12:16 PM   #4
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Doesn't seem all that odd to me. Here's a log from last night after switching to MHD. Granted the ambient was an extremely humid 80ish degrees, so it was fairly hot out.

http://www.datazap.me/u/3586n54/mhd-...g=0&data=1-4-6

Delta of 50 or so degrees in a multi-gear pull.
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      06-17-2015, 12:51 PM   #5
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It depends on the when you are doing the pulls, how long was the car idle before a pull.

Some of my IAT reading ambient was ~77

2nd to 3rd gear pull


40 mph to 120 mph
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      06-17-2015, 12:53 PM   #6
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Guess I'm more concerned why the temp doesn't return closer to ambient after the pulls and 15+ min relaxed boostless drive back home. It sheds about 20 degress fairly quickly after the pulls then appears to rebaseline 25 to 30 degrees above ambient.

Appreciate the feedback.
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      06-17-2015, 01:00 PM   #7
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Pre-FMIC I would hit 150+F, post FMIC I would hit 120F, post Meth my car never exceeds 90F (usually between 70-80).
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      06-17-2015, 07:46 PM   #8
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Pre-FMIC i would hit 150*+ with just normal driving in the harsh 90*+ and 90% humidity summers of South Florida and post FMIC i would have to try really hard to get Inlet temps to 150* and once it did it would drop fast after some calm driving. The Inlet temps are typically within 20-30* of ambient unless i do multiple pulls.
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      06-17-2015, 08:23 PM   #9
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I got the 5in non core vrsf. My ambient temps are 20-50 degrees when cruising depending on how hot it is.

On a 3rd gear pull it goes up to about 10 degrees.

When it gets heat soaked it takes forever to cool down.

Not bad
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      06-17-2015, 08:28 PM   #10
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It won't really ever be ambient. Between engine temp, oil/coolant temp, turbo temperatures and the radiating heat it's hard to get near ambient. It all comes down to heat soak plus the air has to run through the turbo's which can be really hot.
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      06-17-2015, 09:11 PM   #11
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
It won't really ever be ambient. Between engine temp, oil/coolant temp, turbo temperatures and the radiating heat it's hard to get near ambient. It all comes down to heat soak plus the air has to run through the turbo's which can be really hot.
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      06-18-2015, 09:01 AM   #12
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Quote:
Originally Posted by Sgop335
Quote:
Originally Posted by Fun w/N54 View Post
Have ER FMIC and wondering what delta others are seeing. After handful of highway pulls per the AP the Charge Air Temp is 50 degrees F higher than ambient. Then after cool down no boost the Charge Air Temp settles back at about 30 degrees higher than ambient.

Sensor reading is same as ambient initially. And car runs fine with no codes and few timing corrections.

Looking for some feedback from others who have logged or observed this delta in the past.

Thank you.
That seems pretty high. About 20-25F is my differential even on hot days. 7" vrsf.
What sensors and instruments are you using for you measurments?

How close to ambient do your temps return after pulls and a 10-20 min boostless cruise.
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      06-18-2015, 09:26 AM   #13
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Quote:
Originally Posted by Jeff@TopGearSolutions
It won't really ever be ambient. Between engine temp, oil/coolant temp, turbo temperatures and the radiating heat it's hard to get near ambient. It all comes down to heat soak plus the air has to run through the turbo's which can be really hot.
Thanks Jeff and everyone else. Dummy me I didnt log pre FMIC so dont have anything to compare directly.

I would expect some elevated temps but just wanted to sanity check. If you look at the chart on the ER site they barely show any increase over the pull and then pre pull temp is very close to ambient.

Weather here hasn't been above 80 yet so will grab some addition logs as summer progresses and see how it goes. Cheers.
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      06-18-2015, 10:36 AM   #14
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Quote:
Originally Posted by Fun w/N54 View Post
Thanks Jeff and everyone else. Dummy me I didnt log pre FMIC so dont have anything to compare directly.

I would expect some elevated temps but just wanted to sanity check. If you look at the chart on the ER site they barely show any increase over the pull and then pre pull temp is very close to ambient.

Weather here hasn't been above 80 yet so will grab some addition logs as summer progresses and see how it goes. Cheers.
The ER graph seems realistic but the point of this next post by me is to illustrate that these graphs don't tell the whole story.



First question being, how cold was it outside?

Were the runs on the same day?

Were the runs having the same heat soak before the pulls? Meaning were they done on a cold car or later in the afternoon after the car has been driven?
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      06-18-2015, 10:45 AM   #15
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Here is an example of ETS Intercooler

First data shows stock intercooler runs:



You were curious what those pre inlet temps looked like.

According to the stock intercooler they can be potentially high and up to 200F+ after a hard pull.

Second data shows their ETS intercooler runs with Pre and Post temps with a 2-3-4 pull on the dyno:


*Note you need to zoom in

Inlet Start ~120 inlet End ~210

Outlet start ~80F outlet End ~161

This is on a very heat soaked car going through 2nd 3rd and 4th gear pulls.

It's also important to know we don't know the ambient air temp and the car is not on the road with real wind.

However, we can deduce on the runs with the ETS intercooler, considering the inlet temps are higher, there must have been either higher ambient temps and or more existing heat soak compared to their stock intercooler runs which started at 111 inlet temp and 59 outlet temps.

They actually did themselves a partial disservice by not potentially doing the data on same day, same ambient, same heat soak.

However, you can still deduce on the delta that the ETS intercooler does work based on the delta alone.

Again, whole point being all these details of the runs:

Were they on a dyno or with real world wind?

Ambient air temps

Heat Soak

Single Gear pull or multi gear pull

Same day runs or different

ETC
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Last edited by Jeff@TopGearSolutions; 06-18-2015 at 10:50 AM.
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      06-18-2015, 10:48 AM   #16
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Only time ive ever been able to keep IATs level like that was with a huge FMIC and no front bumper. And even then, only for a couple pulls.

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