IAT sensor location
#1
Supporting Vendor
Thread Starter
iTrader: (3)
Join Date: Jul 2006
Location: San Diego
Posts: 3,303
Total Cats: 1,216
IAT sensor location
Just curious about where you guys are putting the IAT sensor. I'm going to remove the AFM soon and the MSPNP instructions say to plumb it right before the throttle body but I got confused when I read some posts on here of guys talking about putting it elsewhere..
Thanks
-Ryan
Thanks
-Ryan
#2
Mine (and I think the general location) is about 1/2way betweeen the TB & IC, a little closer to the IC. I know some have put it just outside the IC, and I think the consenus may be leaning towards this being the new desired spot due to heatsoak and whatnot.
Fwiw, I'll be relocating mine to right outside the IC for this reason..
Fwiw, I'll be relocating mine to right outside the IC for this reason..
#4
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,499
Total Cats: 4,080
if you're n/a then anywhere on the intake path.
if our boosted then after any cooling device.
in both cases each should be installed in a location where heat-soak will be less of an issue.
example, outside of the engine bay, just after the IC:
if our boosted then after any cooling device.
in both cases each should be installed in a location where heat-soak will be less of an issue.
example, outside of the engine bay, just after the IC:
#7
Have you guys actually had problems due to IAT sensor heatsoak? My non-Miata turbo has the IAT sensor in its factory location right behind the throttle plate, and while the IAT readings do go way up at idle on a hot engine, it cools right down once there is some air moving through the engine.
#8
I think maybe people are using a different reference to heatsoak than I understand. I have an open and a closed GM IAT/CLT sensor in front of me, and it looks like the closed loop sensor would get some serious misreads through its own case. I put it upside down in water and the sensor itself reflected water temp to a few degrees with the sensor tip completely out of the water. My next experiment involves ice and the same setup, since I have 2 meters with thermocouples, I'll freeze one in ice on the sensor and set the other one in water.
I haven't tried to put the open element sensor in water, they're not really made for that and would likely damage the sensor over time. The case of the closed-tip is very related to the temp of the surrounding metal, not the surrounding air. Running in a metal intake manifold (with coolant loops in the intake mani itelf like my GTX and a TB coolant anti-ice loop) screwed in is more or less completely wrong. There's a reason every OE car intake temp sensor is either properly isolated (AFMs are a good example) or are isolated AND open element (j body cavalier, most GMs, most japanese without flappy meter). My Daihatsu has a closed element sensor on the intake manfold, but its plastic and I haven't been able to modify its temperature with even a blowtorch on the intake manifold.
edit: Maybe we are all on the same page. Putting the IAT sensor on the plastic post-AFM pipe would solve manifold heat conduction-related errors.
I haven't tried to put the open element sensor in water, they're not really made for that and would likely damage the sensor over time. The case of the closed-tip is very related to the temp of the surrounding metal, not the surrounding air. Running in a metal intake manifold (with coolant loops in the intake mani itelf like my GTX and a TB coolant anti-ice loop) screwed in is more or less completely wrong. There's a reason every OE car intake temp sensor is either properly isolated (AFMs are a good example) or are isolated AND open element (j body cavalier, most GMs, most japanese without flappy meter). My Daihatsu has a closed element sensor on the intake manfold, but its plastic and I haven't been able to modify its temperature with even a blowtorch on the intake manifold.
edit: Maybe we are all on the same page. Putting the IAT sensor on the plastic post-AFM pipe would solve manifold heat conduction-related errors.
#9
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,499
Total Cats: 4,080
my AIT sensor would see over 140*F temps once i shut the motor off. that's heatsoak.
once moving the temps would drop but still stay high, they would actually drop in boost. that's heatsoak.
moved from that position, i see just above ambient anytime I'm not in boost, and the temperatures actually show a delta in boost....that's not heatsoak.
once moving the temps would drop but still stay high, they would actually drop in boost. that's heatsoak.
moved from that position, i see just above ambient anytime I'm not in boost, and the temperatures actually show a delta in boost....that's not heatsoak.
#15
hmm, weird. the other day when it was about 28 outside it was reading around 36. I hardly ever have problems with it. When i'm idling it can go higher, but i'm sure the whole engine bay is getting hotter. as soon as i start moving, it drops way down again. usually it's around 6-10 degrees hotter than outside air.
And yeah about venting it, I'll probably vent that hole to an oil breather, then run the other one to a catch can. i feel like that'd work better.
And yeah about venting it, I'll probably vent that hole to an oil breather, then run the other one to a catch can. i feel like that'd work better.
Thread
Thread Starter
Forum
Replies
Last Post
Zaphod
MEGAsquirt
47
10-26-2018 11:00 PM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
Greasyman
General Miata Chat
2
09-28-2015 10:44 AM