View Full Version : s14 sr20 vacuum line and cold pipe issue

07-17-2013, 09:56 PM
hey I've looked around alot but found no threads containing definitive answer or results .. I'm not sure where the large outlet on my greddy s14 fmic cold pipe goes to. I've heard it is to iacv. also have two vacuum lines coming from under intake not sure where they should be routed to. also black plastic tube infront of valve cover .. apparently not needed without bov ?

pics of a complete s14 sr20 bay with cold pipe and vacuum line close ups would be AWESOME ... again I've looked around but found no definitive answer..

and this is s14 sr20det into a sohc s13

07-18-2013, 07:58 AM
Try a Google image search. AMAZING what you will find.

The LARGE outlet on your GReddy cold pipe goes to the throttle body... The SMALL outlet goes to your IACV.

The 'black tube' in front of the valve cover is the original air intake pipe. You need to leave it in place so as not to overcombobulate the flux capacitor.

07-18-2013, 07:16 PM
man I overcombobulated my fc once .. terrible business. thanks for info. I looked at plenty pictures and like I said found no definitive results as no pictures clearly showed the pipe. only that it pointed to the ground behind rad. thanks

07-18-2013, 07:20 PM
also I was told the second outlet goes to useless fan shroud plastic and should be capped

07-19-2013, 07:39 AM
Here are S13 SR pics... Same principle when using GReddy/FReddy intake on S14.

Large outlet on cold pipe- goes to IACV:



07-19-2013, 07:41 AM
also I was told the second outlet goes to useless fan shroud plastic and should be capped

Not sure what the second outlet is... and the fan shroud plastic is far from useless.....

Use the ports under the intake to run vac/boost to your fuel pressure regulator and boost/recirc/wastegate actuator. Whatever ports you don't need have to be capped off. There are LOTS of writeups on this.

07-19-2013, 07:13 PM
On the s14 cold pipe the big opening pipe is for stock bov as well as the plastic pipe in the front of your valve cover. The plastic pipe is for recirculating your bov. The medium size pipe is for the iacv and the smallest one is a vacuum source that you can use for any of your accessories that need vacuum and boost.

Under the throttle body there are 4 ports for vacuum or boost. The top 2 are smaller in size and are boost only and the lower ones are bigger and see vacuum as well as boost.

07-19-2013, 07:15 PM
If you want you can pm me your phone number and I can text you pictures of mine. I have an s14 in a single cam s13 chassis. With the greddy front mount piping.