Pontiac Solstice Forum - View Single Post - Ok here you go, first free mod

Guys i posted this late lastnight and did not have pix up when i charge my camera ill take better pix.

1. What is the solenoid for?

I beleive its a form of safty but I dont want that saftey.

It can work as what is known as a POP OFF VALVE, or a SAFTY REALEAS VALVE. If you disconnect the hose going to the surge valve, chances are you will boost 8lbs or so, i haven ot tried it yet. What ever it is that you boost, thats what the spring inside that surgevalve is. A pop off valve is setup to open at X amount of boost so you dont overboost your engine. Its not a BOV.
I think however that the solenoid is used mainly to give you some lag at the lower RPM band so you dont peal out etc, because if you get alot of boost down low and your a newbie on driving a turbo car you can break the tires loose easier. So they give you a progressive increase in boost as your RPM goes up. These are my assumptions , it is not law.

2. How it works:

The valve has spring tension plus boost tension keeping it close. Lets say the spring is 5 lbs and we are boosting 10psi. We now have 10psi at the turbo, in the plumbing and in the manifold. We also have 10psi pushing the solenoid close plus the 5lb spring. So 15lbs is more than the turbos 10 so the valve stays closed.

If the ecu sees to much boost, it can close the solenoid so now the boost in the turbo overcomes the 5lb spring so boost goes down. It can do this in theory, but im not sure if it does it or not. I do feel strong that it does this though:

When your at a low RPM, the surge valve opens some causing your boost to be low, as you go up on the RPM the surgevalve closes so now your boost goes up.

The main reason of the surgevalve is to act as a BOV, to keep howfast the turbo comes online i beleive is its secondary mission.

3. HOW ITS HOOKED UP:

If you look on the intake manifold you will see the solenoid (pic on lin above in first post). It has a nipple pointing down, up and one to the left. You install a T fitting as shown. You remove the Left line and hook it up to the T-fitting. You cap off the Left nipple with a vacuum hose cap or you can trim about 1" of vacuum hose, put it over the nipple and put a bolt in it.

The T-fitting will also go to an aftermarket BOV so if you have a BOV in your car you will need to add a second one. You can cut onto the BOV vacuum line going to the upgraded BOV and T into there so you dont have two T on top of each other by the manifold.

1 PM AND IM YET TO HEAR ANY FEEDBACK FROM YOU STOCK GUYS WITH THIS MOD!!!!!!!!!! AUTOZONE IS OPEN ON SUNDAYS!!!!!

YO!!!!!!!!!!!!!!

Last edited by Exhaust Depot : 04-15-2007 at 12:21 PM.

	Exhaust Depot Supporting Tuner Join Date: Feb 2007 Location: Ft. Laurderdale	Guys i posted this late lastnight and did not have pix up when i charge my camera ill take better pix. 1. What is the solenoid for? I beleive its a form of safty but I dont want that saftey. It can work as what is known as a POP OFF VALVE, or a SAFTY REALEAS VALVE. If you disconnect the hose going to the surge valve, chances are you will boost 8lbs or so, i haven ot tried it yet. What ever it is that you boost, thats what the spring inside that surgevalve is. A pop off valve is setup to open at X amount of boost so you dont overboost your engine. Its not a BOV. I think however that the solenoid is used mainly to give you some lag at the lower RPM band so you dont peal out etc, because if you get alot of boost down low and your a newbie on driving a turbo car you can break the tires loose easier. So they give you a progressive increase in boost as your RPM goes up. These are my assumptions , it is not law. 2. How it works: The valve has spring tension plus boost tension keeping it close. Lets say the spring is 5 lbs and we are boosting 10psi. We now have 10psi at the turbo, in the plumbing and in the manifold. We also have 10psi pushing the solenoid close plus the 5lb spring. So 15lbs is more than the turbos 10 so the valve stays closed. If the ecu sees to much boost, it can close the solenoid so now the boost in the turbo overcomes the 5lb spring so boost goes down. It can do this in theory, but im not sure if it does it or not. I do feel strong that it does this though: When your at a low RPM, the surge valve opens some causing your boost to be low, as you go up on the RPM the surgevalve closes so now your boost goes up. The main reason of the surgevalve is to act as a BOV, to keep howfast the turbo comes online i beleive is its secondary mission. 3. HOW ITS HOOKED UP: If you look on the intake manifold you will see the solenoid (pic on lin above in first post). It has a nipple pointing down, up and one to the left. You install a T fitting as shown. You remove the Left line and hook it up to the T-fitting. You cap off the Left nipple with a vacuum hose cap or you can trim about 1" of vacuum hose, put it over the nipple and put a bolt in it. The T-fitting will also go to an aftermarket BOV so if you have a BOV in your car you will need to add a second one. You can cut onto the BOV vacuum line going to the upgraded BOV and T into there so you dont have two T on top of each other by the manifold. 1 PM AND IM YET TO HEAR ANY FEEDBACK FROM YOU STOCK GUYS WITH THIS MOD!!!!!!!!!! AUTOZONE IS OPEN ON SUNDAYS!!!!! YO!!!!!!!!!!!!!! Last edited by Exhaust Depot : 04-15-2007 at 12:21 PM.