For reasons. I want to relocate IAT sensor out of the passenger MAF to a new spot. Anyone know of a compatible IAT sensor that doesn’t require any sort of scaling or tuning, that will read correctly off of the factory IAT wiring?

 

Sounds like you'll need to spec out a MAF.
Check resistance between the sensor at the lowest of temps in your state + highest temp and start searching from there.

Let me ask you, are you doing this to monitor temps elsewhere or trying to change the location of the IAT to influence engine performance?

 

I have seen a few posts of people doing this but they never post what sensor they used, might be another angle to approach if I can find the ohm of the stock IAT in MAF.
Was hoping someone knew all this already.

Neither. I have WMI.

 

found this in service manual.

 

Where are you planning to move it to?

 

If i do. Most likely on the flat surface of the IM
immediately after TB. Gives my WMI approx 8” of intake to atomize and cool the air before taking reading.

 

You could just use another OEM MAF and only wire up the IAT (ie branch those wires out of the stock MAF wiring)

 

I actually thought about that, probably the most accurate reading that way, but they are massive compared to just an IAT and would require a lot more ingenuity to mount/install.
a normal aftermarket IAT is just a 1/4-3/8 npt, would easy to tap into manifold.

Ive been mapping out a few after markets sensors, AEM has one that is close. At 100F+ its spot on, technically at 86F its still in spec just at the absolute limit for the spec tolerance, but below 86F I believe it would technically read slightly colder with the variance being greater and greater the colder it gets, at 32f I believe it will think its about 25F or 7F colder, A lot of people I'm finding are just using GM IAT sensor which is similar to AEMs mapping. under about 80-100F it should be in closed loop fueling and any slight difference in temps changing fueling the fuel trims should compensate, in open loop / WOT IAT should get over 80F quickly enough to then be pretty spot on accuracy.

The only concern is probably heat soak of the sensor moving it from intake tube to the manifold, however plastic doesn't heat soak easily or transmit heat very well, and I think the sensors are some what insulated. However cruising around shouldn't generate too much heat to soak it either, and cruising condition with the GM/AEM should read low anyways so slightly soaking it only brings it back to accurate, and then at WOT when heatsoak of the IAT in that spot would be most likely happen the WMI is cooling it anyways. So not sure that is much of a concern on my setup.

Also any pulling of fuel if the IAT did heat soak or false high reading, WMI is adding fuel which would compensate even more so.

 

Doubt there will be any heat soak and if there is it will be gone the minute throttle angles pass 10% or more.
From the data I've been following on my custom airboxes, at part throttle I'm about 3-4 degrees from ambient.
Skyrockets at idle with ac on up to 20-25 + then back down the minute the throttles open which is consistent with operation.

Living in the intake manifold might yield similar results at idle for you as well, expect an even lower drop in yours once MWI is enabled however your train of thought is correct. You want the IAT to pick up this temp change, you also want this sensor to pick up lower than 60 F in case MWI is enabled during low ambient temps.
The plastic of the IM is thick enough to drill and tap and it being plastic will not have much effect on heating as long as the sensor tip is exposed. Wiring wise, the sensor will survive.

Lastly depending how good you are with disassembly you could sacrifice a MAF's temp sensor and try to install that. Being that it's a bare resistor the should be plenty of room for it.

 

Disassembly was my first thought too - but maybe an older Nissan might have a screw-in IAT sensor with a similar temp/resistance curve? I know with Mazdas even as the sensor packaging changed, the values didn't.