Intake piping KA24det

Ok, I'm making a custom intake and I was wondering what the differences are between 2.5 inch and 3 inch. I'm looking for a little more high end without losing torque. I was hoping to maybe gain some torque. Does anyone have any tips with the design; Bends, funneling the piping, etc.? I have also heard that longer piping and more bends leads to more torque. Is this true?

Oh, and no I am not moving my battery to the back so I can go cold air.

i just thought of this...but you could just move the battery to the other side where the stock air box was. couldnt you just make some new tubing where the stock tubes were, put a filter on with some sensors, then put a cold air box around it. or does the cai have to be short and stuby?

You don't want to use bigger pipes than you need to, it will just be adding volume to the IC which you don't want if you don't need it. Air speeds inside the intercooler tubes should not excees about 425 feet per second because of increased drag and unneccesary flow loss at speeds above that. First, figure out the max airflow you will be pushing and then guess at what size intercooler piping you want to run. Say that you want 500 HP which is approximately 750 CFM. And say you want to run 2.5 inch intercooler piping. Plug the numbers into the following equation as I show:

http://members.cox.net/spoolins14/equation.JPG


which if you work out, it comes out to approximately 366.879 f/s which is still lower than the 425 or so that you shouldn't exceed. So, 2.5 inch piping would be fine for this situation considering you have a supporting I/C.

ok, thanks for all of that, but I'm not running a turbo.

hahaha

Id say match your Intake piping to your Throttle body size. it would probably come out too 2.75 so id go with the 3in

ok, thanks for all of that, but I'm not running a turbo.

Then what the fuck is a "KA24det?" The same theories apply to normal intakes, not just i/c piping.