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Old 02-14-2013, 12:14 AM   #1
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Default 1.6 Greddy Intercooler Piping Size

Hey Fam,

I was wondering what size intercooler do you guys recommend for the stock greddy setup. This past xmas my Girl friend got me a 2.5" intercooler piping kit from ebay, now I know this is not the best quality but cant get mad at her for trying to get me something for my car. I have done some reading and researching and I see there are mixed people using both the 2" and 2.5" interooler piping as well as routing. My question is will the 2.5 be too large for my greddy setup with timing set back at 6 degrees. The car already has decreased low end and I was wondering how much more lag it will have when adding an intercooler. Im pretty sure theres a possiblity I can increase timing just a bit due to cooler air being fed. Let me know what your advices are,thanks.



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Old 02-14-2013, 12:21 AM   #2
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I went from no intercooler to a 2.5" Coldside/2.0" hotside set up and felt no difference in spool. Greddy kit at 6psi.
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Old 02-14-2013, 12:48 AM   #3
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ahh yes I did see some people do that as well, did you advance the timing a little or did you stay with the 6 degrees? I was planing on pushing the radiator towards the engine and installing the pipes over it so it will be shorter intercooler setup.
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Old 02-14-2013, 07:23 AM   #4
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TL;DR

2"

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Old 02-14-2013, 06:14 PM   #5
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2.5 is fine, it looks beefy and I doubt you'd notice the difference.

The bigger change for you is going to be switching your wastegate signal source to as close to the throttle body as possible, thank me later.
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Old 02-14-2013, 06:34 PM   #6
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Nothing wrong with the E-bay IC piping kits. Give her a Valentine's kiss. She did good.

Post pics of your setup when you finish. And switch to MS.
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Old 02-14-2013, 06:45 PM   #7
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Say total piping is about 4 feet.

2" diameter pipe roughly has

PR^2x48
3.14x1x1x48 = 150ci

2.5" pipe
3.14x1.25*1.25*48 = 235ci

Difference in volume 85ci

a 1.6 at 7k rpm flows about 170cfm

Add 6psi of boost to that so you'll increase it to 200cfm

85ci to cubic feet is 0.0491898cf

200cfm=3 1/3 cfs

3 1/3= .0491
1 = x
x= .01473

So theres ur answer, the difference in spool at 7k rpm is .0147 of a second.

Since you wont be spooling up at redline lets add something more valid such as half of that at 3.5k rpm. So say 100cfm
100cfm=1 2/3cfs

1 2/3 = .0491
1 = x
x=.0294

At 3.5k rpm you'll spool with .0294s slower with the bigger piping.

Looking at those numbers the only benefit i see with going with smaller piping is the ease of making it fit.
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Old 02-15-2013, 09:38 PM   #8
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Interesting. I will definitely post pics up when finished and yes she got a good Valentines day gift... a ride in the car lol.
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