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Discussion Starter · #1 ·
Hey i just was curious.. I've been running the Boost Logic 5857 Turbo setup on my car at about 750+whp for a while, and i am still on stock intercoolers.

I know the stock turbos being pushed generated a bunch more heat, and that if you run larger turbos and dont really push them out of the threshold they will blow much cooler then the previous setup.

My question is how neccessary is a larger upgraded intercooler if your not running say 28-35psi constantly and just have a larger turbo setup on the street running 18-24psi. I never noticed my intake temps getting out of control even on pulls up to 180-190mph.

My thoughts would be intercoolers would be less neccessary the larger the turbo setup you go unless you plan on pushing them extremely hard. Also the capability of handeling larger amounts of CFM coming threw.

Would that mean the stockers would create more back pressure on the larger turbos as well?

Sorry for all the questions was just thinking about whats next on my car build.

Mark
 

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Your intake temperature on Cobb is before the turbo compress the air. I have the same question as you as nobody show any data. One way to find out is install intercooler temperature gauge showing before and after ic temp. This way you can tell efficiency of the ic. I plan on install that gauge one of these days, but I am pretty sure your cfm surpass factory rating for the ic.
 

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Correct, Stock it is not measured. When you go speed density, a lot of tuners will relocate the MAF/Intake Air temp sensors to post inter-cooled boost, then you can log the temps.

Most domestic cars with boost have 2 air sensors Pre and post boost, most JDM do not.

Only way to tell is to do that, or add a 2nd one that you can datalog.
 

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Correct, pre and post temp are the ones to look at for temp efficiency. Pressure drop is what you want to look at for flow capability. If you have too small of a core (hot flow cross section) then the pressure in will be greater than the pressure out. A little pressure drop goes a long way in making things bad.
 

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Anyone that has tuned their GTR properly with SD mapping should be able to answer this question - as part of 'doing the job right' is to install a calibrated IAT sensor in the charge pipe. Once done, and the data logged, many would be - very surprised - how well the stock coolers actually cool. From what I have seen there are some aftermarket intercooler downgrades around that may have a fraction less pressure drop but also dont cool the intake charge worth a dime. The only thing we can make out wrong with the stock intercoolers at sane power levels is the word 'stock' in their name. Its not cool like having a Motec Systems exhaust


Your answer is to measure the pressure drop across the core at the boost level you want to run, then measure the temperature drop and come up with an overall efficiency number - then do the same test with the aftermarket cooler of your choice.The one with the better math is the better intercooler.

Note - If I remember right 800hp Cobb Time Attack GTR ran stocker intercoolers....
 

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Discussion Starter · #6 ·
I am actually going to speed density and relocating the ait so I will test temps.. Only reason I remember is I put the iat when I had Haltech and remember temps being much. Ether with the bigger turbos but I never got to test pressure drop or pre and post temps
 
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