I am at the final stages of my T04S install and I was wondering if anyone has used the PMS to successfully control boost with a standard HKS wastegate. If so how did you go about it.

Thanks,
Sergio
93 touring(x2)

 

Does anyone know this answer because this will my setup too!!

Manny

 

I tried using the PowerFC with the stock solenoid to contol my A'PEXi wastegate. It would spike to 15 psi and then drop to the spring pressure by redline. I gave up and bought an AVC-R.

I still think it *might* be possible to use the stock solenoids, but you'd probably have to plumb both solenoids in parallel to increase flow and then do some tuning with the vent size. At first I had a Holley carb jet in my vent line, but the boost would shoot up to 18 psi before I let off. I then just removed the vent line from the T fitting, which left too large a vent.

Also, I am not sure the PowerFC or PMS are "active" enough in their boost control routines to hold the same pressure over a range of RPMs. I think the PMS just chooses one vent duty cycle setting for 4500 to 8000 RPM and adjusts it slightly in response to the boost it sees. I think most electronic boost controllers are more active in their monitor/adjust cycles.

I do have a sketch of how I hooked up the stock solenoid that you might want to look at:
http://www.maxcooper.com/rx7/how-to/...ost/index.html

The "I think it is working" update is old. It turns out I just saw 15 psi and then turned my gaze back to the road without realizing that the boost dropped after that.

-Max

 

I posted my question to the EFI PMS list and Doug (the creator of the PMS) stated the following:

"...If you setup your solenoid as a bleed off it won't require as much flow. Boost pres -- restrictor --- tee--wastegate other side of tee to the solenoid. If you only need a 2 line solenoid the buick gran nat solenoid will work. The control uses the secondary solenoid the primary is no longer used. You can also use the Apexi
solenoid with the PMS."

I think this alittle different from Max's setup. Maybe we should give this a try.

Before I try this I want to make sure of a couple of things:
- Does the solenoid open or close at a given boost pressure? I'm assuming that it opens.
- Also which is the inlet port on the solenoid (top or bottom)?

Thanks,

Sergio
93 touring(x2)

 

On the stock system, you increase duty cycle to increase boost. If you set the solenoid up as the vent for the "top" wastegate line, you'll need to increase duty cycle to reduce boost, which is backwards from the stock setup and will learn itself the wrong way.

It seems like you could setup the stock solenoid as a vent on the bottom wastegate line, which will preserve the direction of higher duty for more boost. That might work.

-Max

 

The solenoid cycles all the time, and will be open more (higher duty cycle) to make more boost.

I don't think it matters which way you connect it because it just opens and closes with no vent. You should verify that by seeing if you can blow through either port with the solenoid off, because I am not 100% sure.

-Max