Post Intercooler IAT
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This is a discussion on Post Intercooler IAT within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I've seen this done before in order to monitor BATs (Boost Air Temperature). On my MS3 it was integrated straight ...

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    Registered User trancehead's Avatar
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    Post Intercooler IAT

    I've seen this done before in order to monitor BATs (Boost Air Temperature). On my MS3 it was integrated straight into the Cobb AP and was a very useful parameter in terms of tuning.

    On a WRX the only viable position I can see a sensor going is the throttle body hose, post-intercooler.

    I've been looking at the Mishimoto silicone hose but am not sure if it would be a good idea to tap into it even if covered with silicone after putting the sensor in.

    The only other option I can see is getting a small metal piece fabbed up, tapping that for the NPT sensor, and using two small silicone couplers for the throttle body and intercooler.

    Any input or ideas for this? Not knowing that temp is driving me nuts and making tuning harder on myself and my tuner.

    Gauges I am looking at:

    Prosport Digital Gauge

    Glowshift Analog Gauge
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    Registered User Heide264's Avatar
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    Who says BATs? Strange Mazda people.

    Anyhow, actual IATs are more useful if you are tuning with speed density. In terms of MAF type tuning, its not really that practical - you use what you get and go from there. It's definitely do-able if you care enough about it, but most people don't, especially on a stock top mount intercooler. Most would add one if they were doing an air/water IC or they'll put one in some FMIC plumbing.
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    He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.
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    Registered User subypete's Avatar
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    Quote Originally Posted by trancehead View Post
    I've seen this done before in order to monitor BATs (Boost Air Temperature). On my MS3 it was integrated straight into the Cobb AP and was a very useful parameter in terms of tuning.

    On a WRX the only viable position I can see a sensor going is the throttle body hose, post-intercooler.

    I've been looking at the Mishimoto silicone hose but am not sure if it would be a good idea to tap into it even if covered with silicone after putting the sensor in.

    The only other option I can see is getting a small metal piece fabbed up, tapping that for the NPT sensor, and using two small silicone couplers for the throttle body and intercooler.

    Any input or ideas for this? Not knowing that temp is driving me nuts and making tuning harder on myself and my tuner.

    Gauges I am looking at:

    Prosport Digital Gauge

    Glowshift Analog Gauge
    Have you thought about tapping directly into the intake manifold?
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    Registered User cflip2x's Avatar
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    I wanted to put a pre and post intercooler temp sensor but was waiting till I get a FMIC or aftermarket TMIC so I can have more of a solid base to tap into.

    Mach V Digital Intercooler Temperature Gauge - Gauges

    but I would rather not spend that much for a temp sensor.
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    Registered User trancehead's Avatar
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    I know EVOs use the same terminology.

    I am going to stick with top mounts so either way I will not have much of an option for tapping into hard piping. TBH tapping the stop IM makes me a bit nervous. Not sure if NPT would work wel with the plastic?
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    Registered User cflip2x's Avatar
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    upgrade to a process west and then get some sensors
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    Registered User trancehead's Avatar
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    What about the cold side end tank of the stock intercooler until I upgrade? I'm wondering if thi would compromise the integrity of the end tank at all
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    Registered User Heide264's Avatar
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    Quote Originally Posted by trancehead View Post
    I know EVOs use the same terminology.
    I was just giving ya a rough time. I've never heard the term and was just being a jerk.

    I am going to stick with top mounts so either way I will not have much of an option for tapping into hard piping. TBH tapping the stop IM makes me a bit nervous. Not sure if NPT would work wel with the plastic?
    I'm not overly familiar with the WRX intake routing. I have seen silicone hoses with NPT ports in them, however. Check out Frozen Boost. They specialize in Air/Water IC's (AWICs), and have a bunch of parts that may help you. If you check out miscellaneous installation parts, you'll find the silicone NPT port thing I was talking about.

    I guess I would take a step back and give the whole situation some thought. I'm an engineer and like to have data... don't get me wrong. I also tune my own STi and would find that piece of information pretty useful (if not more useful than standard IATs). However, unless you have some specific plans for it such as doing your own tuning or going speed density, I would reconsider the real estate you are using up. I don't know if that piece of info would be that useful to you outside of data logging unless you were putting in a manually actuated IC sprayer or something (questionable even then).

    If you are doing your own tuning, consider looking into a product such as innovate's thermocouple receiver. It'll take 4 TC inputs and throw them on their 'data bus' which you can read/log to an SD card with an OpenPort2.0 easily (along with their wideband controller output). I'd love to pick one up and stick a few sensors in a few places, and probably will in the future.
    Quote Originally Posted by Trainrex
    He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.
    2011 STi Build Log
    -Part 1 - Reading, Data Logging, and Analyzing Data
    -Part 2 - Turbocharger 101 & Basic Boost Control
    -Part 3 - EcuFlash, Experimental Defintions, and a Drive By Wire Intro

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    Registered User trancehead's Avatar
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    ^^^^^

    This is exactly what I was looking for. The only part that worries me is the line that says to put some epoxy on the nut to keep it from falling out.....yeah that would be great right in front of the throttle body lol

    My tuner and I (Rich from RichTune) are going to be going at the tuning process very, very slow. He's one of the best tuners out there for the MS3 MS6, and ST platforms. He would just like to expand his base because people are constantly asking him about WRX/STi. Essentially the first process will be logs upon logs on the AP and analyzing them for hours.

    The IAT would just be a huge bonus. It would just be nice if there was a secondary sensor in the IM like there is in the Speeds and ST's
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    Registered User Heide264's Avatar
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    Quote Originally Posted by trancehead View Post
    ^^^^^

    This is exactly what I was looking for. The only part that worries me is the line that says to put some epoxy on the nut to keep it from falling out.....yeah that would be great right in front of the throttle body lol

    My tuner and I (Rich from RichTune) are going to be going at the tuning process very, very slow. He's one of the best tuners out there for the MS3 MS6, and ST platforms. He would just like to expand his base because people are constantly asking him about WRX/STi. Essentially the first process will be logs upon logs on the AP and analyzing them for hours.

    The IAT would just be a huge bonus. It would just be nice if there was a secondary sensor in the IM like there is in the Speeds and ST's
    Considering the poorly documented compressor/turbine maps of the stock turbo's on Subaru's, it could be very powerful for a large scale tuner. I'd love to have a pre-post turbo, pre/post IC temp (both air streams), and pre/post turbo pressure readings. You could basically find your actual turbo efficiency in live time.
    Quote Originally Posted by Trainrex
    He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.
    2011 STi Build Log
    -Part 1 - Reading, Data Logging, and Analyzing Data
    -Part 2 - Turbocharger 101 & Basic Boost Control
    -Part 3 - EcuFlash, Experimental Defintions, and a Drive By Wire Intro

  12. #11
    Pro Manscaper Mikie13's Avatar
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    Skip Glow**** gauges...terrible quality. Prosport isn't very good either, but better than Glowshift.

    Look for something better like Innovate, Defi, AEM...
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    \_(ツ)_/ Rambo's Avatar
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    I had the Prosport IAT gauge, but ultimately never installed it due to the huge 3/8" hole requirement. Get a 3/8" NPT pipe fitting and test around your intercooler to see if there's a good spot for it, but I couldn't find one. I eventually sold the gauge to a guy for his diesel truck build (it wasn't Brandon, FYI). Presumably he had a big cast iron block to bore into, whereas a WRX just has thin aluminum or plastic.

    Here is a much nicer IAT gauge, although not in the typical 52mm form factor: Mach V Digital Intercooler Temperature Gauge - Gauges
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    zax
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    TBH, the IAT sensor relocation is better for improved timing and fueling compensation. As far as tuning the car is concerned, your tuner should be able to do all he needs by simply reading a compressor map and understanding the CFM capabilities of the intercooler. Granted, IHI does not publish compressor maps, but there is a lot of empirical evidence to determine the behavior of the IHI turbos under boost.
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