Since there are a few people that ask, "where do I run this vacuum line to? where do I run this one?" I figured I would make a thread with a few pictures showing them where to run the vacuum lines. This is for SR20DET specific, more than likely it will work for your KAT too (but don't quote me on that one).
Ok first of:
If you have a Manual Boost Controller/MBC or Electronic Boost Controller/EBC (I have an EBC) this is how you would run the vacuum lines. This is written for an Greddy Profec B Spec-II EBC. If you have a different EBC look at the manual and see which port is for the wastegate and which port is for your pressure source on the boost solenoid.
First run a vacuum line from the wastegate actuator to the COM port on the Greddy boost solenoid.
From here:
![Image]()
To here (the little box between the boost solenoid and the power steering pump canister is for my Defi Boost Gauge):
![Image]()
The other port on the solenoid (which is the NO port) goes to a pressure source. What I did was buy an fitting that had a 1/4 nipple on it, then I made a hole just a tad bit smaller in my intercooler hot pipe (which is the pipe that comes from the turbo) and then screwed the fitting on there (don't worry its lock tight). The fitting can be bought at a local auto parts store for a few bucks.
From here:
![Image]()
To here:
![Image]()
On the Manual Boost Controllers you would run the line from the wastegate actuator to the port on the MBC that has the arrow. The second port would go from the MBC to the pressure source (fitting on hot pipe or the nipple on the cold pipe)
For you guys with stock sr20det side mount intercoolers, there should be a nipple already on the cold pipe (which is the pipe that comes from the throttle body). You can connect the pressure line to the nipple on the cold pipe. Also, if you have a nipple on the housing of the turbo you can run the pressure source to that nipple too.
Now for your boost gauge and the 2nd part to the boost controller. You can T both of them to the line that goes to the FPR (Fuel Pressure Regulator). Some people say, you should never T the line to the FPR but then again I have seen/read lots of threads where this is recommended to a person and the manual states to T the FPR line.
The one on the left part of the T goes to my Greddy EBC unit and the one to the right goes to my Defi Boost Gauge.
![Image]()
Your BOV will need its own vacuum source. DO NOT T THE BOV TO YOUR WASTEGATE ACTUATOR.
From the top right nipple on the SR20DET throttle body:
![Image]()
To you BOV:
![Image]()
The small nipple on the bottom left hand side of the throttle body should be capped off. Just zip tie your lines or use another form of locking the vacuum lines to the nipples or the T.
Now, if you need more vacuum ports. You can always get vacuum blocks off ebay. They are cheap and come with extra 3-6 vacuum ports. Just make sure you never hook up the vacuum block to the line that goes to your brake booster, that is dangerous.
Vacuum Blocks on eBay (click me)
Here is a stock vacuum line diagram for an SR20DET. This picture was edited and translated from Japanese to English by Hijackthis on Nicoclub.com, so all credit goes to him on this diagram:
![Image]()
Any comments or criticism just post on here or PM and I will correct the info. :thumbsup
Ok first of:
If you have a Manual Boost Controller/MBC or Electronic Boost Controller/EBC (I have an EBC) this is how you would run the vacuum lines. This is written for an Greddy Profec B Spec-II EBC. If you have a different EBC look at the manual and see which port is for the wastegate and which port is for your pressure source on the boost solenoid.
First run a vacuum line from the wastegate actuator to the COM port on the Greddy boost solenoid.
From here:
To here (the little box between the boost solenoid and the power steering pump canister is for my Defi Boost Gauge):
The other port on the solenoid (which is the NO port) goes to a pressure source. What I did was buy an fitting that had a 1/4 nipple on it, then I made a hole just a tad bit smaller in my intercooler hot pipe (which is the pipe that comes from the turbo) and then screwed the fitting on there (don't worry its lock tight). The fitting can be bought at a local auto parts store for a few bucks.
From here:
To here:
On the Manual Boost Controllers you would run the line from the wastegate actuator to the port on the MBC that has the arrow. The second port would go from the MBC to the pressure source (fitting on hot pipe or the nipple on the cold pipe)
For you guys with stock sr20det side mount intercoolers, there should be a nipple already on the cold pipe (which is the pipe that comes from the throttle body). You can connect the pressure line to the nipple on the cold pipe. Also, if you have a nipple on the housing of the turbo you can run the pressure source to that nipple too.
Now for your boost gauge and the 2nd part to the boost controller. You can T both of them to the line that goes to the FPR (Fuel Pressure Regulator). Some people say, you should never T the line to the FPR but then again I have seen/read lots of threads where this is recommended to a person and the manual states to T the FPR line.
The one on the left part of the T goes to my Greddy EBC unit and the one to the right goes to my Defi Boost Gauge.
Your BOV will need its own vacuum source. DO NOT T THE BOV TO YOUR WASTEGATE ACTUATOR.
From the top right nipple on the SR20DET throttle body:
To you BOV:
The small nipple on the bottom left hand side of the throttle body should be capped off. Just zip tie your lines or use another form of locking the vacuum lines to the nipples or the T.
Now, if you need more vacuum ports. You can always get vacuum blocks off ebay. They are cheap and come with extra 3-6 vacuum ports. Just make sure you never hook up the vacuum block to the line that goes to your brake booster, that is dangerous.
Vacuum Blocks on eBay (click me)
Here is a stock vacuum line diagram for an SR20DET. This picture was edited and translated from Japanese to English by Hijackthis on Nicoclub.com, so all credit goes to him on this diagram:
Any comments or criticism just post on here or PM and I will correct the info. :thumbsup
