08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

IAT2 on LNF

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Old Jun 26, 2009 | 08:57 AM
  #26  
umrdyldo's Avatar
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Sweet, thank you.

Makes me feel free comfortable about riding in this heat.

Don't wanna be blowing in pistons because of heat.
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Old Jun 26, 2009 | 09:48 AM
  #27  
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Originally Posted by umrdyldo
I have no way to test my IAT2s.

Has anyone tested stock IAT2s or with aftermarket IAT2s?

I would really like to know if the car is getting really hot intake temps on a hot day.

I would think with my huge intercooler that it wouldn't get much above ambient.

But we know what assumptions do.
Depends on a few factors like IAT1, speed, outside temp, RH, driving style and tuned vs stock but. For the most part Stock IC hard driving tuned with 95* temps will result in up to 150* IAT2s. My car even with SRI, agressive tune, and 100* ambient temps (up to 150* IAT1) never has risen above 107 with my Synapse IC. It is about a 50* drop vs IAT1 when sitting still with no airflow which is very impressive IMHO. When running on the HWY the other night I did a 45-130 pull (about 10 sec total) and my IAT2 never rose above ambient temp ( 84*)

Originally Posted by Tomtwtwtw
So you're upset because the stock i/c cools the air down all the way back to ambient after being compressed?
It does not according to logging I have done. It can be 50* above ambient temps with hard driving. The stock IC heatsoaks badly in 90*+ temps and hard driving.

Last edited by Terminator2; Jun 26, 2009 at 09:48 AM. Reason: Automerged Doublepost
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Old Jun 26, 2009 | 09:54 AM
  #28  
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i was in 93 degree weather and my IAT1 rose up to 120 but my IAT2 didnt go past 102
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Old Jun 26, 2009 | 10:03 AM
  #29  
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Originally Posted by xray_racer
No one is upset at all. Would you like to explain further? I think what you're getting at is when the air enters the intercooler it has already been compressed by the turbo and hence is a lot warmer than when the air enters the intake. I didn't even think about that until now. So the intercooler is actually doing a lot more than I originally thought.
Exactly - the purpose isn't to cool air down below ambient, but to get it as close as possible after being heated by compression.

Originally Posted by Terminator2
It does not according to logging I have done. It can be 50* above ambient temps with hard driving. The stock IC heatsoaks badly in 90*+ temps and hard driving.
Interesting - maybe it's a humidity thing? In the dry-ass heat of AZ, it has been extremely efficient for me.
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Old Jun 26, 2009 | 10:16 AM
  #30  
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Originally Posted by BartSS
i was in 93 degree weather and my IAT1 rose up to 120 but my IAT2 didnt go past 102
That makes me feel even better considering we have the same intercooler.
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Old Jun 26, 2009 | 11:16 AM
  #31  
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Originally Posted by Tomtwtwtw
Exactly - the purpose isn't to cool air down below ambient, but to get it as close as possible after being heated by compression.



Interesting - maybe it's a humidity thing? In the dry-ass heat of AZ, it has been extremely efficient for me.
Yes, high RH and high temps are murder on the stock IC if you drive hard. Lower RH even it hot conditions there will be less heat soak than really humid conditions.
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Old Jun 26, 2009 | 03:04 PM
  #32  
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It makes me wonder if a aftermarket IC would help an otherwise stock SS/TC? My car runs much stronger at night in the cold air. If it's supposed to make 260 all the time , why doesn't it pull the same during the day?
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Old Jun 26, 2009 | 05:48 PM
  #33  
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Originally Posted by rukkee
It makes me wonder if a aftermarket IC would help an otherwise stock SS/TC? My car runs much stronger at night in the cold air. If it's supposed to make 260 all the time , why doesn't it pull the same during the day?
260 is only the target torque figure - the higher rpm the car can make that amount of toruqe, the more horsepower it'll make and the harder it will pull. What you'll likely see if you compare stock dynos in hot vs cold weather is the two similar peak torque figures, but the car in the heat will start seeing torque drop much sooner.
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