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Recently we've been having a downpour for a few days straight. The rains been coming down pretty hard. Last night I was driving down the interstate doing like 70 MPH and noticed my BATS were pretty high at 160*F and my IATs was at 110*F. The temperature that night was 75-77. That's pretty abnormal. Today the rain finally let off and took it for a spin again to see if they still persisted. This time they were normal with BATs at 110 and IATs at 89 on a 70* afternoon. So it went away.

Someone correct me if I'm wrong, but here's my take on this. I think the grill can take it water, wetting the intercooler and with the engine heat, it can turn it into steam causing a sauna effect spiking the temps up. That only explains the BATs and not the IATs. So does the rain play with our air temps this bad? Has anyone experienced this before or do I have a problem? Thanks fellas!

EDIT: Air mods are Fujita CAI, Cobb TIP, and SU TMIC.
 

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Hmm... I just drove ~75 miles home tonight in heavy rain from visiting the family, and once I got off the highway a little ways, and my BATs were 98F @70 ambient. I was wondering if the rain hitting the fmic helped cool it down. The water hitting mine is 'all fresh' though, so not cooking in the engine bay. Maybe it's an fmic thing, or maybe it's nothing :O
 
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Agreed. Water has a cooling effect. It's a curious acquisition. The BAT is registered at the MAF and IAT at the MAF. Maybe vapors entering the intake from your CAI are causing some funky readings? Do you have anything covering that wheel well vent or a hydrashield? Even if it's unrelated to the topic, you should have one of the two anyway.
 
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Agreed. Water has a cooling effect. It's a curious acquisition. The BAT is registered at the MAF and IAT at the MAF. Maybe vapors entering the intake from your CAI are causing some funky readings? Do you have anything covering that wheel well vent or a hydrashield? Even if it's unrelated to the topic, you should have one of the two anyway.

I think you might be on to something, Groceries. I don't have anything to protect the intake from the water. I thought the BATs were registered in the intake mani for some reason. This can explain it. Maybe I took the nasty street water vapor to trip out my MAF. Better get some MAF cleaner tomorrow and cleanout my filter. Thanks fellas!
 

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just my $.02 but water does have a cooling effect. That's why Evo MR's come with a "spray" option. Like a water/meth injection. BUT TMIC's don't breath very well are are quite inefficient IMO with no hood vent. The front air canals don't really help much as far as I can tell (maybe there are numbers that could prove me wrong). There would be very little water in your bay for it to really help unless you are driving in someone's spray in front of you. The high humidity of the air combined with the heat under the hood could be the cause of the higher numbers. If you had a FMIC it would be a different story. you would be running around 20-30 degrees cooler in the wet and would notice a bit more power.
 

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Mine was acting weird too this past week. Running great now though.
 

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You guys stop farting in the seat. Your pissing you cars off!
 

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Recently we've been having a downpour for a few days straight. The rains been coming down pretty hard. Last night I was driving down the interstate doing like 70 MPH and noticed my BATS were pretty high at 160*F and my IATs was at 110*F. The temperature that night was 75-77. That's pretty abnormal. Today the rain finally let off and took it for a spin again to see if they still persisted. This time they were normal with BATs at 110 and IATs at 89 on a 70* afternoon. So it went away......
You really need to address the TMIC position/sealing as we discussed at CPE. Another reason for a bit higher BATs and IATs is wind direction/traffic. The engine bay MUST have clean airflow though it. I've done LOTS of testing along these lines when researching the TMIC vs FMIC debate. You will get slight increase in temps when driving with a strong wind rather than into it. Following traffic too closely will drive up the temps as will HEAVY rain. The water rushing downwards does indeed beat down the air FLOW through the grill area which will cause decreased flow and increased temps. A very slight drizzle and 70+ mph is the BEST thing for air temps though.....

FYI, when driving up to CPE in near 70 deg ambient temps, IAT was ~82 and BAT was about ~79 with cruise on.
 

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I'm going to take a level, put it on the shroud, and shoot some pics to paint a picture of what you told me, Joe. I didn't realize how bad it was until I looked at it from the TMIC lever, I was like "oh shit!!" The coolest BAT I got during the drive was like 110, same ambient temp as yours.
 

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Yeah, I have ~1/2" of washers on the rear tab, ~3/8" on the outside front tab, and one extra washer on the front center tab to square it all up. It should be level left/right and tipped down towards the front to follow the hood line. I'm away from my car for a while or I would take a few photos of mine, but you got a good look at it didn't you?
 

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Yeah I got a good look at yours. No wonder your looked much more leveled that mine. I'm most likely going to make another thread about this for others info. Good stuff, Joe! I was abot ask for the washer size but nevermind.
 
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