Diy fmic
#1
Diy fmic
Looking at the intake pipe running under the bumper in front of the engine, and the astronomical (including corresponding mark-up) price of the offered FMIC kits ($1,000 for an intercooler, 4 bent pipes, 8 flex connectors and a bunch of hose clamps), I am wondering:
Just take this pipe out (hose clamp on passenger and driver side), cut and splice a small intercooler in IN ADDITION to the factory intercooler?
Cost: $100 plus some elbow grease.
A full DIY with replacing the factory IC requires some custom tube bending and fit fiddling.
I'm sure no-one has done that, but looking for comments:
- flow: will the larger internal cross section of the intercooler (compared to a straigt pipe (my guess: the insided diamter of the current pipe is 1.75 inch?) add further flow restrictions?
- intercooler area: well, obvious at least twice as much
- 'heat sink': the additional thermal mass will act as an additional heat sink, which IMO can be good an bad: it can quickly take out heat for short periods of high boost (= high temperature), but will also give back heat for no boost periods.
Your thoughts?
Just take this pipe out (hose clamp on passenger and driver side), cut and splice a small intercooler in IN ADDITION to the factory intercooler?
Cost: $100 plus some elbow grease.
A full DIY with replacing the factory IC requires some custom tube bending and fit fiddling.
I'm sure no-one has done that, but looking for comments:
- flow: will the larger internal cross section of the intercooler (compared to a straigt pipe (my guess: the insided diamter of the current pipe is 1.75 inch?) add further flow restrictions?
- intercooler area: well, obvious at least twice as much
- 'heat sink': the additional thermal mass will act as an additional heat sink, which IMO can be good an bad: it can quickly take out heat for short periods of high boost (= high temperature), but will also give back heat for no boost periods.
Your thoughts?
#2
I think it will create a noticeable pressure drop and extra lag because of the added volume and 2 IC cores... i also think its overall just a dumb idea no offense lol. Your k03 wont like it, and according to your sig you are only running 12.5psi which is pretty low for a chipped 1.8t. scrap the idea and buy an ebay fmic kit.
#3
What is the recommended (no more than 300 hp peak)
- intercooler size
- connecting pipe diameter
(obviously: compromise between "bigger the better" = increased lag and larger heat sink mass, but lower flow restriction vs. "smaller is better" = less lag, less heat sink, higher flow restrictions).
I remember seeing somewhere that 2" is good, 2.25" is plenty and everything above just adds lag?
- intercooler size
- connecting pipe diameter
(obviously: compromise between "bigger the better" = increased lag and larger heat sink mass, but lower flow restriction vs. "smaller is better" = less lag, less heat sink, higher flow restrictions).
I remember seeing somewhere that 2" is good, 2.25" is plenty and everything above just adds lag?
#7
- not attempt to do the bends from scratch
- use ebay 'custom' kit for 300 incl 20x6x2.75 plus 2" pipe
I I had to do it again, I would only change the thickness of the IC from 2.75 to 2.5.
In this post are photos and links.
https://www.audiforums.com/forum/sho...d.php?t=147018
Last edited by vtraudt; 03-30-2010 at 08:21 AM.
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