R56 Where is the IAT sensor located on MCS?
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Where is the IAT sensor located on MCS?
I instructed at a HPDE in the Mini this weekend.
Ambient temps were around 60*. ScanGuageII reported that the Intake Air Temps never got much above 80* on track during the 20 minute sessions. This is with the ALTA intercooler, CAI, and full turbo back exhaust.
The hottest I saw was 110* but that was sitting in the pits for like 10min just idling, as soon as I got up to speed on track the temps dropped.
Seems like only a 20* difference in intake temps vs ambient is too good to be true with a turboed car, even with an aftermarket intercooler. So that begs the question, where is the IAT sensor located that ScanGuageII reads (OBDII)?
Is it pre-turbo (near the air filter intake), or post intercooler (before the intake manifold)?
Seems to me that post intercooler temps would be the only relevent info needed, but what do I know. I'm not a German engineer.
Also noticed that the coolant would be around 220* while idling or driving around town, but would be just around 190* on track.
Speed range was probably 60-125mph on track.
-Scott
Ambient temps were around 60*. ScanGuageII reported that the Intake Air Temps never got much above 80* on track during the 20 minute sessions. This is with the ALTA intercooler, CAI, and full turbo back exhaust.
The hottest I saw was 110* but that was sitting in the pits for like 10min just idling, as soon as I got up to speed on track the temps dropped.
Seems like only a 20* difference in intake temps vs ambient is too good to be true with a turboed car, even with an aftermarket intercooler. So that begs the question, where is the IAT sensor located that ScanGuageII reads (OBDII)?
Is it pre-turbo (near the air filter intake), or post intercooler (before the intake manifold)?
Seems to me that post intercooler temps would be the only relevent info needed, but what do I know. I'm not a German engineer.
Also noticed that the coolant would be around 220* while idling or driving around town, but would be just around 190* on track.
Speed range was probably 60-125mph on track.
-Scott
Last edited by sbarton; Apr 20, 2010 at 12:24 PM.
I instructed at a HPDE in the Mini this weekend.
Ambient temps were around 60*. ScanGuageII reported that the Intake Air Temps never got much above 80* on track during the 20 minute sessions. This is with the ALTA intercooler, CAI, and full turbo back exhaust.
The hottest I saw was 110* but that was sitting in the pits for like 10min just idling, as soon as I got up to speed on track the temps dropped.
Seems like only a 20* difference in intake temps vs ambient is too good to be true with a turboed car, even with an aftermarket intercooler. So that begs the question, where is the IAT sensor located that ScanGuageII reads (OBDII)?
Is it pre-turbo (near the air filter intake), or post intercooler (before the intake manifold)?
Seems to me that post intercooler temps would be the only relevent info needed, but what do I know. I'm not a German engineer.
Ambient temps were around 60*. ScanGuageII reported that the Intake Air Temps never got much above 80* on track during the 20 minute sessions. This is with the ALTA intercooler, CAI, and full turbo back exhaust.
The hottest I saw was 110* but that was sitting in the pits for like 10min just idling, as soon as I got up to speed on track the temps dropped.
Seems like only a 20* difference in intake temps vs ambient is too good to be true with a turboed car, even with an aftermarket intercooler. So that begs the question, where is the IAT sensor located that ScanGuageII reads (OBDII)?
Is it pre-turbo (near the air filter intake), or post intercooler (before the intake manifold)?
Seems to me that post intercooler temps would be the only relevent info needed, but what do I know. I'm not a German engineer.
The IAT is measured after the IC. There is a straight hard pipe on the passenger side of the engine bay with the IAT sensor on top.
The coolant temp is also about right.
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OK, thanks. That makes sense.
So then by my calculations the intercooler effeciency is like 87% or higher?
http://sbmedia.info/TurboAirTemps.html
Using 60* for ambient temp
100* for Intake Temp (at air filter)
10psi for boost pressure
70% for compressor effeciency (this is a guesstimate)
and 80* for intercooler outlet temp
gives me around 87-88% effeciency. Is this realistic? If so that seems pretty impressive, or am I way off base?
-Scott
So then by my calculations the intercooler effeciency is like 87% or higher?
http://sbmedia.info/TurboAirTemps.html
Using 60* for ambient temp
100* for Intake Temp (at air filter)
10psi for boost pressure
70% for compressor effeciency (this is a guesstimate)
and 80* for intercooler outlet temp
gives me around 87-88% effeciency. Is this realistic? If so that seems pretty impressive, or am I way off base?
-Scott
Last edited by sbarton; Apr 20, 2010 at 12:27 PM.
Aftermarket IC's help a ton with this car...so what you saw is pretty normal.
And slinger is right about the location, you'll see it on the passenger side of your motor on the straight hard pipe. It is the MAP sensor...also reads boost at this location too.
And slinger is right about the location, you'll see it on the passenger side of your motor on the straight hard pipe. It is the MAP sensor...also reads boost at this location too.
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My only other turbo car was a highly modded MR2 Turbo. They had side mount intercoolers, which don't get direct airflow like FMIC's, so I'm kinda used to those numbers I guess.
-Scott
-Scott
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