I need help picking a FMIC to go with my e316g soon

[Dylan0123]

Then this doesnt apply to you.
The first post is talking about maximizing the space he has with an intercooler core. Those measurements are huge, in addition there is no need to fill that complete area.

I figured up those measurements based on this post by Gofer (i plugged in info pertaining to my turbo, not the 68HTA he's talking about):

To start of deciding which IC core to spend your hard earned cash on you need to come up with a airflow figure at a specific boost level. I'll use my DSM results for an example here, just input what you want to come up with the correct number for your application.

I bought my 68HTA knowing that it was capable of flowing 47lbs/min and I was going to run about 30psi to get it there. So you've got to convert airflow to cubic feet minute (CFM) and boost pressure to pressure ratio (PR).

CFM = (L x RPM x VE x Pr) / 5660
PR = (14.7 + Boost) / 14.7

So just plug in the info and do the conversions for CFM and PR, here are the numbers for my application.

PR = (14.7 + 30) / 14.7 = 3.04
CFM = (2.0 x 6500 x 95% x 3.04) / 5660 = 663.32

46lbs/min @ 30psi = 663.32 @ 3.04

Now you'll be able to figure out exactly what size of intercooler you'll want for your specific setup, below are the equations.

Minimum Cross Area = ((CFM / PR) + 12.84) / 11.63
Intercool Height = (Minimum Cross Area / IC Depth
Total Volume = (WHP - 50.17) / 0.533
Intercooler Width = (Total Volume / Minimum Cross Area)

So just plug in the info (I used 400whp as my goal and a 3.5" deep IC)

((663.32 / 3.04) + 12.84) / 11.63 = 19.87 sq/in (MCA)
19.87 / 3.5" = 5.68" (Height)
(400 - 50.17) / 0.553 = 632.60 cu/in (Volume)
632.60 / 19.87 = 31.84" (Width)

So the perfect IC core size for my setup, using the above equations, is 32" x 6" x 3.5". Since size contraints do come into play its not always possible to find a IC core that "fits the bill" of the perfect core. For example, if the widest core for your application is 28.5" then you'll want a taller IC to make up that surface area you'll be losing. The ideal core for my numbers is 32" x 6" however, the VRSF core is 28.5" x 10" so I lose 4" off the width but gain it off the height so its perfect.

Here are the dimensions of the three kits we keep referring to, see which one fits your car the best.

VRSF - 28.5" x 10" x 3.5"
PR - 29" x 11" x 3"
ETS - 25" x 10"x 3"

To make it fair, lets see what the numbers would come out to had I used a 3" depth for the core.

((663.32 / 3.04) + 12.84) / 11.63 = 19.87 sq/in (MCA)
19.87 / 3" = 6.63" (Height)
(400 - 50.17) / 0.553 = 632.60 cu/in (Volume)
632.60 / 19.87 = 31.84"

You'll notice the only thing that changed was the height of the core, and being that the PR core is 1" taller and 0.5" wider the 0.5" you lose in depth doesn't matter.

I wish we could know for certain each cores pressure drop or CFM, we just have to go off whats advertised. I pulled all the above info from here and just applied it to DSM's. ---> Intercooler Calculator