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BHAF - What about rain/water getting on paper?


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  • Staff

Simple answer... [ATTACH=CONFIG]1270[/ATTACH] When you got 190-200*F coolant passage within 6" of the IAT sensor that why... This coolant passage runs the entire length of the manifold on the head. Trust me me IAT and ECT sensor match exactly after sitting cold but after the coolant rises to 120-104*F the offset starts to grow...

But thats not really any different than the 3rd gen, other than the MAP sensor gives the IAT temp, and the IAT sensor is in the pre-turbo pipe (but not used for IAT :banghead:) It still seems that all of the airflow thru the intake manifold (don't really think there is much difference in the intake manifolds from 1st thru 3rd gens) would be fast enough that the head won't heat soak it. Even when I idle the IAT's are only 15-20* above ambient. Now with a good heat soak on a hot day they get to 150-160*, but quickly drop to +30, then slowly to +8-15* depending on a/c, load, speed, etc.. The MAP sensor isn't the intent of this photo, but you can see the MAP sensor in the bottom.. http://www.dieselmanor.com/diy/CMS3-gauge/G3image5.htm
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  • Staff

Now notice you towards the middle of the manifold and mounted in a area away from coolant passages... But 2nd Gen is mount at the end of the manifold (#6) with a coolant passage right next door... I think location has a lot to do with it...

It must, 2nd gens appear to only get the #6 airflow to cool it, where 3rd gens get 4,5,6 airflow to cool... But its amazing to me that it would rise 30* in 6" but sensor placenemt is key.. How much hotter does yours get at sustained boost when towing?
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