Thread: Bigger intecooler pipes
06-23-2010, 12:08 PM #1
- Join Date
- Apr 2008
- Plainfield, IL
Bigger intecooler pipes
Hey guys. I was thinking about upgrading from 2.5" pipes to 2.75" pipes. Does anyone feel that could loose performance or would it only gain?
I would think it would allow more flow to be right at the throttle body. But at the same time I feel that it would take more cfm, hence bigger pipes, to get to full boost.
06-23-2010, 12:11 PM #2
talk to Craigo..... He did this and gained 1-2mph top end if im not mistaken... the mor volume the better
06-23-2010, 03:27 PM #3
Youll definatly see better accerlation..Top end???Dont think 2 MPH is warnted by only going a 1/4 in..I could be wrong..We will see after i get Missys ski to RPM back out and install them..
06-23-2010, 08:16 PM #4
for every gain there is a loss ..you will gain flow but loose throddle response...you want to keep the vol of air a small as possible between the charger and the valves for the most part..so the larger the intercooler pipes .the less throddle response you will have ..but i also run 2.75..but i also have a smaller intake plenum
06-23-2010, 09:59 PM #5
I run them and they are great, can't talk about the 2.5''s since I've never ran them.
06-23-2010, 10:23 PM #6
I'm sure bumble bee Gprxp runs 3.5inch pipe .. I could be wrong it might even be 4 inch..,
06-23-2010, 10:33 PM #7
I changed the piping on mine for the same reason.
When calculated out, the amount of air dramatically increased, BUT..!!, theres no point in exceeding the output diameter of the intercooler, or velocity of the air as it exits causes all sorts of flow problems.
Best thing is to keep the diameter of ALL the piping from charger to TB all the same.
The only exception is slightly smaller diameter from the cooler to the TB, as air volume will effectively decrease, so you need to maintain velocity, never, ever larger.
One hell of a fun bit of engineering math to get right for all occasions..(impossible almost)!!
Best way is the same all across the board... and too large, ie 3in would start to get the air resonating etc up and down at certain conditions, reduce charge velocity compared with the TB opening, and more..!!, and as per usual, will hinder, rather than help.
06-24-2010, 12:33 AM #8
I believe I found gains with this setup for a couple of reasons.
1) The 2.75" pipe fits around the outside of the SC outlet (and not abutting the SC outlet) allowing less resistance.
2) The 2.75" pipe allows you to use up nearly the entire 3" diameter going into the IC - allowing more volume of air to be cooled sooner.
3) The radius of the 2.75" bend is much more gradual than the 2.5" radius - allowing less resistance to the IC.
Try it. I bet you'll find a gain in top speed and accelleration - I did.
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