The picture in the manual shows the hose connected to the intake manifold to something they call the "fuel pressure regulator". It wants me to cut that hose and T it off to connect it to the EVC Stepping motor.

Are you sure it isn't the BOV?

It's because the BOV does have a port that I believe is used to connect it with the intake manifold. It's basically a vacuum source.

http://oi44.tinypic.com/zvd79i.jpg
http://oi40.tinypic.com/349ezpk.jpg

That what we said earlier. Because our cars have a returnless fuel system we don't have a vacuum source for the fuel. So what you do is tap the back of the intake manifold with 1/8'' tap NPT and install a 1/8'' threaded barbed fitting NPT into. That becomes your source for the boost controller. This is what HKS doesn't show for us.

Read page 75 http://www.gtmotorsports.com/Manuals...structions.pdf

The vacuum port for the BOV go to another barbed port that needs to be tapped behind the throttle bodies on the intake manifold.

I already have it tapped for the BP turbo kit. It will be used to connect to the BOV. Can't I use a T fitting on that hose and connect it to the stepping motor?

No. You have to add another port. The vacuum line for the BOV is strictly for the BOV and nothing else. BOV's relieve pressure only and in no way should be used for a source for boost.

I cannot wrap my head around this. So I have to tap a SECOND line into the intake manifold to connect that into the stepping motor.

Wouldn't the hose connecting between the intake manifold and BOV be doing the same thing except it is connected to a BOV and not to the stepping motor? In other words wouldn't I be able to T off that hose and connect it to the stepping motor. Or would it cause other problems?

I think I need a break lol.

EDIT: Oldboy is saying what I just said but you are saying that I shouldn't T it off.

What do..?!?

Yes add a second. This is how it's been told to me by Mike at GTM. He gave me the reason why not to attach to the BOV but I can't recall his actual wording. I see why your thinking that way. But the BOV and the Boost control function differently so why have two different functioning equipment operating from the same source. Let them each have there own source.

BOV use a suction while boost is a force.

It doesn't matter if you're using the same vacuum port that feeds the BOV. That vacuum line only serves to counter the pressure of the spring in the BOV so you can vent excessive pressure in your charge pipes. That line is never vented to atmosphere. It represents the pressure in your intake plenum at all time.

When you're boostin' you pressurize your plenum. When you suddenly let go of the throttle, the throttles close and a vacuum is created in your plenum but pressure is still being built in all your charge pipes before the throttle. If the BOV wasn't there, there's a good chance you'd blow your couplers off from the pressure.

So, I can T that vacuum hose between the intake manifold and BOV to connect it to the EVC stepping motor?

Yes you can, I'm currently running that setup on my BP kit also. Just keep the T as close as you can to the plenum and you'll be fine.

Alright, thank you.

I have another question if you don't mind. Where did you get your 12v power source from for the EVC6?

I used the 12V ''cigarette lighter" port underneath the glove box as its ignition switched, easily accessible and doesn't affect any other systems if I blow a fuse. The EVC 6 comes with an inline fuse holder with a 2A fuse, so be sure to use that one.

You could probably get an "add-a-circuit" fuse and find a suitable circuit to add it to but I was a bit lazy and I knew that the circuit for the 12V socket can power way more than was needed for the EVC 6 and I can still use the plug to charge my phone. Like I said, be sure to use that 2A inline fuse holder when you solder it.

It's recommended not to share multiple functions for these devices. Per HKS and ever other manufacture. I read several more articles why. Do what you want! I sat here explaining why while also research other top sites of why not to and one guy comes in and said "you can" and you jump.

I haven't even done it yet. Plus I haven't decided what to do yet. I do want to research more on it before I do anything.

HKS instructions actually contradicts what you just said. There is no logic as to why HKS would not recommend sharing a line when they have instructions showing to do so.

I don't want to start a war with you SPOHN, but you don't have to give the guy a hard time if he chose to use the same setup as that "one guy". That "one guy" is actually running the Boosted Performance turbo kit also with the exact same boost controller, T'd off the exact same way I told him with zero issues. Ever heard of a vacuum block? By your reasoning, HKS made a mistake by telling us to tap into the vacuum hose of the fuel pressure regulator, because its essentially splitting the same vacuum hose for 2 functions, the boost controller and the fuel pressure regulator.

In any case, Cell can do what he wants, he's a grown man and it's his car. No need to be condescending about it. If he wants to punch another hole in his plenum just to have a dedicated vacuum hose for the EVC's vacuum reference, then by all means, he can do it. Since the hose he's T'ing off of isn't smaller than the vacuum reference hose to the EVC, I fail to see the problem. I'm just letting him know from my experience that it works fine.