FMIC piping Q's

**spxxx** · 04-01-2008 12:03 AM

what is the best size piping for a KO4 PC-16?
i currently have 2.5 and im wondering if it is too large for that small of a turbo...

**Tiluleshpingen** · 04-01-2008 07:35 AM

2.25 its perfect

**mike-2ptzero** · 04-01-2008 09:33 AM

2" is the normal size for a K03/K04 and even a stage 3 size turbo but 2.25" wont be too large. A 2.5" isn't really needed till you get up to a BAT size turbo or using this size for the cold side for a BT setup. Basic rule of thumb is to use the same size hot side IC pipe as the outlet of the turbo and a cold side pipe the same size or 1/4" larger. Really want to use the smallest size pipe possible to keep velocity up without maxing out the flow which is mach 1 for any size pipe.

**AudiRacerS4** · 04-01-2008 09:44 AM

i run 2.25'' piping no problem on my setup

**aaronamerica** · 04-02-2008 10:12 PM

Originally Posted by AudiRacerS4

i run 2.25'' piping no problem on my setup

do you have ebay piping too? what pipe kit did you use

**AudiRacerS4** · 04-02-2008 10:58 PM

Originally Posted by aaronamerica

do you have ebay piping too? what pipe kit did you use

the one that came with my intercooler

**dualaudi** · 04-02-2008 11:11 PM

so good velocity is achieved from starting small then going large?

**A4ringedONE8T** · 04-03-2008 06:49 AM

I went against what everyone told me to try something different. Used a 2.5" charge pipe (turbo to IC) and 3" IC to TB. Quickened the spool a bit on my 3071R and gave the car a bit of a torque spike over my previous 2.25" all the way around setup!