Are you talkin 31 12 3 cooler as the core size cause thats what mine was. They called it a 31 12 3 but the core is 24 12 3. Just tryin to clarify. I went with the size I did because 5.5psi and stock cubes won't be in there forever and I didn't wanna have to go bigger later I think that TRT one is killer for people that can't fabricate or for those who wine about cutting the frame.

 

no it has a 24x12x4 core on it. and what about that lower valance. if i put my IC down there it would get no flow. i dno't have a hole in it like that. but i did find a steel chrome aftermarket valance that did and it look pretty nice maybe i should get it.

 

ok my turbo is rated to flow 75lbmin / 960cfm. if i have a intercooler that is rated to flow 700cfm then what will that do? will it cause it to not cool so well? and why is a 4" thick have less frontal flow than a 3" and what if i had two small electric fans on the 4"? i found a ic that has a core of 24x12x3 vise the 24x12x4 but it drop down like 100cfm and rateing goes from 1000 max hp to 700 max hp. now i'm guessing that would be fwhp would this be enough to get me to say 550-600AWHP?

 

I took into account 750 crank hp. When talking about intercooler thickness the second half of the intercooler only does 1/4th of the heat exchanging. The thicker the core the more the efficiency gains become less and less. The major problem with going thicker is the drag coefficient goes up. You can use the thicker core,but you have to be aware of these problems especially with intercooler placement. The thicker the core you have the harder it is going to be for the cooling air to pass through. If you had a way to make ducts to force air through it it could prove beneficial. If you are going to push your turbo to the limit you will want just a bit bigger than the 12x24. The electric fan idea is a good idea making use of the 4" core. I'd start measuring and find out what fits where you want it too.

 

You have a whipple which is why you won't see very many of the negative effects.

Lets say the turbo your using takes 90 lbs/min to make 900 hp. You need about 70 sq in of internal flow. With out knowing the efficiency of the turbo at that range this is just an estimate. To figure out a intercoolers internal flow multiply the core length, width and number of channels. Usually channels are 1/8 in.

 

well i think i'm going to do it behind the bumper/valance. i found an aftermarket valance that is steal/ chrome and it has a hole right in the middle. i don't want to go about moving the radiator and a/c core and all that. i did it for my d-max intercooler that i never got to use and don't want to do it again. so imeasured yesterday and i could fit the 31x12x3 or 4 and i could box the front of it in up against the valance hole to where the air coming through the hole can only go into the IC. if i did that would it be better to go 4". i can also put like 2 10" fans on the back side to help pull air for stop and go traffic.

 

Yeah use the 4" as long as there is ducts and the fans would help dramaticly at low speeds.

 

Just put a 3" intercooler in my Avalanche today.It's pretty much infront of the radiator.Fit very easilly.Have some pics,will post them tomorrow.

 

that front end has alot more room behind it than the one like mine. i want to do a front end conversion to the front end but i don't have the money for go fast and look good.

 

here's mine so far...
https://www.performancetrucks.net/fo...FMIC+should+be