Stand alone IAT (intake air temperature)

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Stand alone IAT (intake air temperature)

Postby Spec BSC » Thu May 11, 2017 3:49 am

I have been looking at several ways of re-arranging the intake tract in order to get the maf after the charge cooler. The main problem is that any charge cooler capable of handling the flow won't fit in the space I have, so I'm going to straighten out the intake pipe and insert a larger maf tube to help with scaling but the problem I will still have is that the maf is still before the charge cooler.
Image

So my plan is to install a small stand alone temp probe into the charge cooler. I have identified the 2 wires on the maf that deal with the IAT.
Image

According to the wiring dia. pin 5 is a signal ground. So my question is has anyone tried this ans secondly is there a specific type of probe that is going to work with the ecu, I have no idea what the parameters are for the OEM IAT.

Any help, pointers gratefully received.
The first engine died after eating to much CAT
The second engine died of a broken piston
The third engine is in the car
The fourth engine is in the machine shop

So far: Rotrex Supercharger (16 psi) with WTA intercooler,DW300c fuel pump,565cc Pink injectors
Producing 431bhp and 350 lb/ft torque on the Rotrex SC not finished yet
Raptor headers, 75mm Milltek exhaust with Quad tips,
Custom made 4032 forged pistons by JE Pistons, forged conrods, Exedy Clutch
K sport 8 pot front, 4 pot rears all on 330mm discs, Hel brake lines
Meister R coil overs, Whiteline 21mm rear ARB, Perrin end links and strengthening brackets
Complete Whiteline kit for the front suspension including steering rack
One off Carbon effect Front grill, Carbon lip spoiler, Exterior De-chromed, LED interior light conversion.
Recaro Leather front seats with all functionality.
Waist spoiler, Smoked rear lights,, LED sill plates, LED sidelights
Prodrive PFF7's 18x8, in Bronze shod with 235/40/18 Goodyears.
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Re: Stand alone IAT (intake air temperature)

Postby cliffo3rb » Thu May 11, 2017 5:50 am

I had this sensor installed in the threaded hole at the front of the WTA cooler. Be careful when drilling and tapping the hole as it has a helicoil in it.

http://www.ebay.com.au/itm/121768603772

Wiring is simple, just take the wires from pins 4 and 5 on the maf and connect them straight up ( no polarity)

Also, looking at the photo i can see there are no bolts in the mounting points for the cooler. You will be loosing boost out these holes so maybe look at getting them plugged up.
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Re: Stand alone IAT (intake air temperature)

Postby Spec BSC » Thu May 11, 2017 7:11 am

cliffo3rb wrote:I had this sensor installed in the threaded hole at the front of the WTA cooler. Be careful when drilling and tapping the hole as it has a helicoil in it.

http://www.ebay.com.au/itm/121768603772

Wiring is simple, just take the wires from pins 4 and 5 on the maf and connect them straight up ( no polarity)

Also, looking at the photo i can see there are no bolts in the mounting points for the cooler. You will be loosing boost out these holes so maybe look at getting them plugged up.


Wow, thanks. that's exactly what I needed to know, will try and find something similar in the UK.
The first engine died after eating to much CAT
The second engine died of a broken piston
The third engine is in the car
The fourth engine is in the machine shop

So far: Rotrex Supercharger (16 psi) with WTA intercooler,DW300c fuel pump,565cc Pink injectors
Producing 431bhp and 350 lb/ft torque on the Rotrex SC not finished yet
Raptor headers, 75mm Milltek exhaust with Quad tips,
Custom made 4032 forged pistons by JE Pistons, forged conrods, Exedy Clutch
K sport 8 pot front, 4 pot rears all on 330mm discs, Hel brake lines
Meister R coil overs, Whiteline 21mm rear ARB, Perrin end links and strengthening brackets
Complete Whiteline kit for the front suspension including steering rack
One off Carbon effect Front grill, Carbon lip spoiler, Exterior De-chromed, LED interior light conversion.
Recaro Leather front seats with all functionality.
Waist spoiler, Smoked rear lights,, LED sill plates, LED sidelights
Prodrive PFF7's 18x8, in Bronze shod with 235/40/18 Goodyears.
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Re: Stand alone IAT (intake air temperature)

Postby cliffo3rb » Thu May 11, 2017 8:45 am

No worries. Good luck with it.

If you have any questions just flick me a PM.
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Re: Stand alone IAT (intake air temperature)

Postby MadmanSean » Tue May 23, 2017 8:57 am

Just to clarify, The IAT sensor is non polarized as essentially it is a Resistor. The ECU is measuring the Voltage drop across this resistor then references the 2D lookup table stored in the ECU to determine what the temp is. Bit of useless information for people :D
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