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What Piping Size To Use?

rice_me_up

By rice_me_up,
in Engines & Forced Induction

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rice_me_up Rising Star

rice_me_up

Posted
Posted

hi all. sorry if this is an issue thats been covered before.

i have an r32 powered by the rb20det. i have a long list of mods (most of which have been purchased but havent been installed yet but will be very soon :P ) which are as follows

GT3071r (apparently) with .64 rear and .70 compressor (externaly gated)

r32 gtr intercooler

power fc

oil cooler

3inch exhaust turbo back

suitable injectors and fuel pump

excedy h/d clutch

z32 A/F meter

my aim is approximately 230-240 rwkw.

the question is what would be the best various sizes of intercooler piping?

should i go turbo->2"->intercooler->3"->throttle body

or turbo->3"->intercooler->3"->throttle body

or turbo->2"->intercooler->2"->throttly body

also note that the end tanks on the cooler are 3" and the throttlebody and turbo outlet are both 2"

Does it even really matter? :dry:

thanks in advance.

james.

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rev210 Grand Master

rev210

Posted
Posted

sometimes a little larger when going around a sharp turn helps the airflow. you sometimes see elbows in factory turbo cars that are larger diameter than the rest of the pipework. They usually have a reducer flexible pipe to attach to the smaller pipes on either side.

The 2 1/4 or 2 1/2 inch is probably about right for the 260-280kw worth of airflow ( 240rwkw ). Like anything make sure you have as short a path as you can, try to avoid sharp bends in the pipework and where there are bends ensure they are well made (I guess most are these days).

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