Stock Srt 4 Turbo Question

chasneonsxt · Post by **chasneonsxt** » Sun Jun 24, 2007 12:49 pm

I was woundering on the stock Srt 4 Turbo where do all the vaccum lines go? And where does the waste gate vaccum line go?

Basiclly I need to Know where all three vaccum lines connect on the srt 4 turbo.

1. Waste Gate
2. Turbo Left Side
3. Turbo Right Side

If anyone knows please explain.

esteinmaier · Post by **esteinmaier** » Sun Jun 24, 2007 4:51 pm

Depends on how you are controlling boost. The simplest way would be to cap one of the ports on the turbo, and run a line directly from the other one to the WGA. That should give you about 4psi from what I've been hearing.

Kevin_GP · Post by **Kevin_GP** » Sun Jun 24, 2007 6:58 pm

Vacuum caps crack and pop off after a while. Best bet is to run both lines off the compressor scroll into a T, then into possibly a boost controller then into the waste gate. Ive tried to block off one of the ports and it works ok, boost controller is more responsive when I have it T'd though.

And yes you will be at 4 psi without a boost controller running it this way.

hul kogan · Post by **hul kogan** » Mon Jun 25, 2007 8:46 am

Yupp, using a T is the best method. I have also tried capping one off before, but the cap quickly deteriorates and eventually crumbles.

chasneonsxt · Post by **chasneonsxt** » Thu Jun 28, 2007 12:33 am

Kevin_GP wrote:Vacuum caps crack and pop off after a while. Best bet is to run both lines off the compressor scroll into a T, then into possibly a boost controller then into the waste gate. Ive tried to block off one of the ports and it works ok, boost controller is more responsive when I have it T'd though.

And yes you will be at 4 psi without a boost controller running it this way.

So were is the compressor scroll located at? Im having the hardest time hooking up the turbos vacum lines.

Kevin_GP · Post by **Kevin_GP** » Fri Jun 29, 2007 11:25 pm

chasneonsxt wrote:
Kevin_GP wrote:Vacuum caps crack and pop off after a while. Best bet is to run both lines off the compressor scroll into a T, then into possibly a boost controller then into the waste gate. Ive tried to block off one of the ports and it works ok, boost controller is more responsive when I have it T'd though.

And yes you will be at 4 psi without a boost controller running it this way.
So were is the compressor scroll located at? Im having the hardest time hooking up the turbos vacum lines.

Compressor scroll has the 2 vacuum ports on it, its on the compressor side of the turbo (the silver part). Run lines off both of those ports into a T, then the end of that T into your boost controller, then into your waste gate. If you don't have a boost controller go right into the waste gate. Those are the only lines relating to vacuum ports on the turbo. You need to tap other sources for a turbo (like for a rising rate fuel pressure regulator, boost gauge, and blow off valve). For all those you should tap into your intake manifold. The big vacuum line for your PVC valve works well because it goes straight into your manifold. You could also use the line from your break booster. Just take a few minutes and look under your hood and figure out what vacuum line goes where.

psi chick · Post by **psi chick** » Mon Jul 02, 2007 1:29 am

if you use a stock srt wga and run it just off the wga you'll be at 7psi, not 4.

Kevin_GP · Post by **Kevin_GP** » Mon Jul 02, 2007 1:40 am

Its 4 psi without any type of boost controller, thats just limited by the spring in the waste gate.

Craz1000 · Post by **Craz1000** » Wed Jul 04, 2007 11:42 pm

psi chick wrote:if you use a stock srt wga and run it just off the wga you'll be at 7psi, not 4.

yes but the pressure hose that goes to the WGA on stock srt's goto ana ctuator that is controlled by the ECU, if you directly hook up the WGA to the turbo the spring will open sooner than the stock srt setup

psi chick · Post by **psi chick** » Fri Jul 06, 2007 10:20 am

Craz1000 wrote:
psi chick wrote:if you use a stock srt wga and run it just off the wga you'll be at 7psi, not 4.
yes but the pressure hose that goes to the WGA on stock srt's goto ana ctuator that is controlled by the ECU, if you directly hook up the WGA to the turbo the spring will open sooner than the stock srt setup

why would it open sooner if the turbo is hooked up directly to the wga? as that's how it is stock, and since the stock wga has a 7lb spring you'll be at 7psi.

Kevin_GP wrote:Its 4 psi without any type of boost controller, thats just limited by the spring in the waste gate.

yes and again the srt comes with a 7lb sping, not a 4.

Kevin_GP · Post by **Kevin_GP** » Fri Jul 06, 2007 10:45 am

psi chick wrote:
Craz1000 wrote:
psi chick wrote:if you use a stock srt wga and run it just off the wga you'll be at 7psi, not 4.
yes but the pressure hose that goes to the WGA on stock srt's goto ana ctuator that is controlled by the ECU, if you directly hook up the WGA to the turbo the spring will open sooner than the stock srt setup
why would it open sooner if the turbo is hooked up directly to the wga? as that's how it is stock, and since the stock wga has a 7lb spring you'll be at 7psi.

Kevin_GP wrote:Its 4 psi without any type of boost controller, thats just limited by the spring in the waste gate.
yes and again the srt comes with a 7lb sping, not a 4.

I know for a fact its 4 psi, so do many people who have put a srt-4 turbo on a 2.0. My car is at 4 psi right now, if it was a 7 pound spring I would not be able to boost 4 psi. Anyone who has installed a turbo without a boost controler can only reach 4 psi.

turbodudey · Post by **turbodudey** » Fri Jul 06, 2007 11:31 am

Kevin_GP wrote:I know for a fact its 4 psi, so do many people who have put a srt-4 turbo on a 2.0. My car is at 4 psi right now, if it was a 7 pound spring I would not be able to boost 4 psi. Anyone who has installed a turbo without a boost controler can only reach 4 psi.

Yep.

In fact, as some of us have seen, the stock wga is so floppy that it won't even hold 4 psi all the time. The one I had would only hold 3 psi.