SwappedNA

iTrader: (1)

So, in an effort to still track down my boost problem, taking into account everyone's advice and the replacement components I've installed, I'm thinking that the culprit is likely the turbo precontrol and wastegate solenoids are hooked up incorrectly at the vacuum hoses.

I've checked the electrical connectors (white on right) and those are in place where they should be.

I've looked at the vacuum hose diagram, but I'm not sure how.to correctly interpret if my vac lines for those two solenoids are correctly hooked up.

Would someone by any chance have a picture of where the lines run to from those two solenoids?

Testrun

You need to trace them down through the metal tubes and follow them to the respective actuator. Wastegate actuator on top and lower is the pre control. Not sure if pics will make much of a difference.

Testrun

Ignore the gray lines as that is my boost control solenoid hooked up to the wastegate actuator..... to control the boost.

Testrun

You can see the black line running into the wastegate. The gray line is running to a boost source and then into the actuator. This would normally be another black line from the boost source just to the actuator with no solenoid in-between.
Also the wastegate solenoid is the one on the right with the white dot and respectively the plug has a white dot.

SwappedNA

iTrader: (1)

I can see the WG lines clearly, but it looks like the photo got cut off for the precontrol lines? Unless I'm just missing it, which is entirely possible.

Testrun

You need to follow it with your fingers may e if you don't have a clear view.
You could always swap the 2 lines and cautiously see if anything changes.

I just ran around for quite some time with the plugs swapped on the solenoid lol.

I see you have the other thread so I will re read it in a bit and offer what I can.... not that I have much to offer on this.

DaleClark

iTrader: (55)

@Testrun you need to re-think your boost controller install. You'll have the Apexi solenoid fighting with the factory solenoid.

See here -

https://www.rx7club.com/3rd-gen-arch...review-192249/

Version 2 is the way to go. I've been running this setup for ages, rock solid boost control with no surprises or weirdness.

@SwappedNA the waste gate "can" that's highest up is wastegate, bottom is precontrol. If you aren't sure which hose goes up top to which solenoid, unplug the hose from each end and blow through it. If you feel the air blowing through the other end you know you have the right hose.

For the 2 solenoids, looking from the front of the car, precontrol is on the left, waste gate on the right.

Dale

Testrun

Dale I don't have the wg plugged in to the factory solenoid, just to the apexi with the pfc. Would that still make a difference? All seems well.

The precontrol is urged into the factory solenoid.

DaleClark

iTrader: (55)

In the picture the nipple pointing right on the waste gate has a hose hooked up, is that just capped up top or something? That's the hose that goes to the factory waste gate solenoid.

With an aftermarket boost controller you can get rid of all that junk - the two factory solenoids, the pills, etc. I have an AVC-R running both waste gate and precontrol (the version 2 in the diagram) and I have 14psi from 2000-ish RPM to 8000 RPM, no dips and dead flat.

Dale

Testrun

It goes to the factory solenoid, but it isn't plugged in so I assume it is "capped". I could be wrong. I will check it and make sure nothing is going through.

I need to keep the pre control hooked up S I in in the factory harness with the pfc controlling it. At least that's how I see it lol.

SwappedNA

iTrader: (1)

That's a good idea, I'll get on that Dale. My only question is, how do i know if they are connected correctly? There are two vac hoses leading off each solenoid, and there are two connections at the wastegate and precontrol right? I'm pretty sure I can tell if they are going to the wrong one, i.e precontrol solenoid vac lines going to wastegate. But my concern is, say they are going to the right ones, but what if the two vac hoses are going to the wrong two receiving connections on the precontrol or wastegate, like, if they are swapped.

Testrun

That's why I said just swap them on the solenoid and see how it responds.
Can you send a pic of your engine bay? Like can you see the hardliners at all? What intake do you have?

SwappedNA

iTrader: (1)

The car is entirely stock engine bay wise, aside from a few mods that don't really pertain to the issue (RE:A rad cap, Greddy oil cap.)

I'll grab a pic here in a minute. I've replaced basically everything in the sequential system except for the turbos themselves at this point. Bryan at Rotorsports said I've basically done all that there is to do.

I know you mentioned you've looked at my other thread, but just to condense the important information, here is the list of what's been done.

**Parts Replaced**

All check valves w/ Dale Clark Vitons
Every single solenoid with new OEM
Efini Y pipe
Turbo Control Actuator
Charge control valve
Charge Relief Valve
90 degree bend hose from CCV.
Hose from CRV back (not the one foreward towards airbox.)
Vacuum tank
Pressure tank

DaleClark

iTrader: (55)

The stock boost control solenoids each get an input from the nipple on the waste gate or precontrol "can" that points to the right when looking from the front of the car.

The output hose on each solenoid goes to the primary turbo inlet duct. It's just a vent to atmospheric pressure, that's all that does. For emissions reasons Mazda has to have that air go back in the intake stream.

You can follow the vacuum diagram, it's pretty obvious which hose goes where for that section of things.

The nipple that points up or to the left goes to the dual nipple thing at the primary compressor outlet. Those lines have the pills in them.

What is the current state of your boost control?

Dale

SwappedNA

iTrader: (1)

@DaleClark So if I'm looking at the wastegate/precontrol from the front of the car, is it the top vacuum nipples on each one that go to the turbo inlet duct, or the bottom ones?

My boost control is factory, aside from the PFC, which I have no idea what map it is running, though I doubt it would cause these issues. I checked with the commander to verify sequential turbo control is on.
It's still doing the usual thing, normal primary, plummets like a rock at 4500, and slowly builds up to 3-4 psi I believe if I am WOT to redline. Not that this matters, or maybe it does, but the factory BoV will have a distinct high pitched weak "pew" noise when its building up to the 3-4 psi after the secondary transition (if I lift off the throttle. bov is not vented or anything, but it sounds different than if I let off normally.)

Testrun

If it is pretty much stock I don't need a pic, I was just curious as to how much you can see.

DaleClark

iTrader: (55)

The answers are all in the vacuum diagram -

https://www.rx7club.com/3rd-generati...-turbo-749702/

Just follow along and trace. Top port goes to the waste gate cans, bottom to the primary turbo inlet.

Find a weekend when you can head to Pensacola and we'll get it knocked out

Dale