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A line out the back of the intake manifold directly to the vaccum block as the source (car has hydro boost so no vaccum from brakes)
MAP sensor is in the vaccum block
Fuel pressure regulator directly to vaccum block
Blow off valve and waste gate Teed together coming directly from the intake manifold
Is this a correct way to do it? It's how my friend did it lol.
Was thinking about putting the MAP directly into the intake ( the car was running 104KPA at idle which is no vaccum) i've sense then re done everything.
then running the source to the block from back of the intake, everything else like the waste gate, bov and regulator will all be off the block with their own lines.
If anyone helps I appreciate it. Last thing on my car todo, just wanted to make sure it's right
No vacuum goes to the wastegate. That bottom port on the wastegate gets a pressure source, and the top port is left open if only using spring pressure or to a boost controller
When I ran my previous turbo setup on gate w/o an EBC the gates would see vacuum/boost.
Ran it that way for a little over year with no issues.
Waste gate was a 44mm Tial and 50mm Tial BOV if that helps.
I have limited experience, with exactly ONE wastgate, 1/4" hose directly to plastic LS Truck manifold... it gets vacuum right up until it gets BOOST. What am I doing wrong ?
I have limited experience, with exactly ONE wastgate, 1/4" hose directly to plastic LS Truck manifold... it gets vacuum right up until it gets BOOST. What am I doing wrong ?
You sure it's not your BOV?? A 2 port wastegate is normally gonna have a pressure source to the bottom port then the top port is either open if only using spring pressure or connected to a boost controller of some type whether it be manual or electronic controller
I have limited experience, with exactly ONE wastgate, 1/4" hose directly to plastic LS Truck manifold... it gets vacuum right up until it gets BOOST. What am I doing wrong ?
Nothing at all wrong with that. I have read that "wastegates can't have vacuum" nonsense for a long time, but not for nearly as long as I have been running intake manifold reference to wastegates. The only other option I know of anyone using is running a line straight off the compressor housing, but that does not work properly when using an intercooler, unless you use an electronic controller.
1. What is the advantage of having the WG connected to manifuld (and thus also vacuum) vs. the compressor?
2. Why is it problematic to have the WG connected to the compressor when running an intercooler?
If you are running a manual boost controller, or no controller, having the boost reference from the compressor will not compensate for pressure drop across the intercooler. You get more pressure drop at higher flow rates, therefore you get decreasing boost pressure at the manifold compared to the compressor cover as load increases. Taking your boost reference from somewhere after the intercooler fixes that, and the intake manifold is the easiest and most logical place to do that. I have never seen or heard of a negative effect of having vacuum to the wastegate, so why not use the intake manifold?
I will say after running on gate for a couple years with my last car, when I did switch to an EBC, the boost hit way harder than gate.
Would definitely recommend running some kind of EBC.
I ran the Innovate SCG-1 on my last car and it worked great, easy to install, easy to setup with basic features.
My current car has a Cortex EBC and while its way more complex, it offers a ton of great features.
I'm redoing my car with CO2 boost control, but some of this conversation has me questioning a few things. Mainly, I never used boost control, only ran on spring pressure - but I had the top port connected to a boost control solenoid ( bottom of wastegate connected to compressor discharge ). I was seeing some high RPM boost creep (18 PSI with 12 PSI springs ) - is it possible that me having the line routed to a non functioning boost control solenoid ( which acts like a plugged line for all intents and purposes ) was actually preventing my wastegate from fully opening?
Also, where is the best location to run the line for the fuel pressure regulator from? I have a long line going from the back of the intake on the passenger side all the way around to the driver's side. My fuel pressure never seems to rise 1:1 with boost. If I can T into the blow off valve like 91Z said, I'll have a much shorter line coming from right behind the TB.
I'm redoing my car with CO2 boost control, but some of this conversation has me questioning a few things. Mainly, I never used boost control, only ran on spring pressure - but I had the top port connected to a boost control solenoid ( bottom of wastegate connected to compressor discharge ). I was seeing some high RPM boost creep (18 PSI with 12 PSI springs ) - is it possible that me having the line routed to a non functioning boost control solenoid ( which acts like a plugged line for all intents and purposes ) was actually preventing my wastegate from fully opening?
Also, where is the best location to run the line for the fuel pressure regulator from? I have a long line going from the back of the intake on the passenger side all the way around to the driver's side. My fuel pressure never seems to rise 1:1 with boost. If I can T into the blow off valve like 91Z said, I'll have a much shorter line coming from right behind the TB.
Aren't you running a Termi X system?? No reason to just leave it unused
So this is how mine is setup, there's a vacuum block under the cowl next to the brake master cylinder using the large 5/8" rubber hose typically used for the brake booster.
Everything vacuum/boost referenced related comes from that using small plastic push lock lines, single small line going to the BRFPR, BOV's, etc. which seems to work very well.
For boost control my Viair compressor feeds air to the 3-port Mac valve at port 1, port 2 goes to the top of the wastegate, 3 is open / vent.
Then I have a separate line going from the compressor to the bottom of the wastegate as pictured below.
When I first got the car, the air from the turbo was going to both Mac port 1 and the bottom of the wastegate with Mac port 2 going to the top of the wastegate which I thought was interesting as my last car I set it up so the turbo air was going to the Mac valve and then to the wastegate only.
All methods seemed to work just fine for controlling boost, the last method however made running a low lb. spring not possible as the gate would open due to exhaust backpressure.
I still feel like boost comes in the hardest and is more stable with compressed air, maybe that's just me though.
Aren't you running a Termi X system?? No reason to just leave it unused
Yes, but I'm still in the tuning stages and I have a manual trans, so no way of triggering the boost control without adding a bunch of stuff I'm not going to use anyway. I just ordered a wheel speed sensor so I can do boost by speed. I'm still wondering if I'm correct about the wastegate being held shut because there's no place for air to vent if the solenoid is off.
LS1F: "- is it possible that me having the line routed to a non functioning boost control solenoid ( which acts like a plugged line for all intents and purposes ) was actually preventing my wastegate from fully opening?"
.
. YES, you need to run the top hat port OPEN if you want the wastegate to function correctly on SPRING pressure.
LS1F: "- is it possible that me having the line routed to a non functioning boost control solenoid ( which acts like a plugged line for all intents and purposes ) was actually preventing my wastegate from fully opening?"
.
. YES, you need to run the top hat port OPEN if you want the wastegate to function correctly on SPRING pressure.
Thank you! That gives me a good explanation for the boost creep I was seeing in 3rd and 4th gear, and also why that creep wasn't at all consistent. Sometimes it would happen, sometimes it wouldn't. I'm plumbing for CO2 now, so I swapped my spring for a 5 lb. one to give me a better range of control. OP, sorry for hijacking your thread, but I figure good discussion while staying on topic ( mostly ) is good for anyone viewing the info.
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turbo vacuum routing 
