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Diy fmic

  #1  
Old 02-20-2010, 09:18 AM
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Default 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?
 
  #2  
Old 02-20-2010, 10:52 PM
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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  
Old 02-21-2010, 09:12 AM
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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?
 
  #4  
Old 02-22-2010, 10:17 PM
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one of the small ebay cores with like 2" piping is more than enough for a k04. But if you plan on going BT in the future then i would just spend the money on a real (big) fmic.
 
  #5  
Old 02-23-2010, 07:52 AM
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Anyone know what the OEM sizes/dimension are for
- the intercooler
- the connecting pipes
 
  #6  
Old 03-30-2010, 07:13 AM
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The intercooler pipes are 2 inch. Don't do that set up. I did my FMIC for 120 (ebay and craigslist baby!). Look in the DIY section for FMIC write up...
 
  #7  
Old 03-30-2010, 08:17 AM
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Originally Posted by joenelson7687 View Post
The intercooler pipes are 2 inch. Don't do that set up. I did my FMIC for 120 (ebay and craigslist baby!). Look in the DIY section for FMIC write up...
I used the DIY FMIC write up as a decision tool to
- 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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