I've recently bought a greddy profec B spec II. I'm trying to install it myself, but I've searched and searched and I've found some contradiccions. The installation is already done and the module is working, but I'm not sure about where to put the hoses that goes from the solenoid valve (black box) provided I think this information will be useful for future profec B users

These are the possibilities I've found searching in the club:

1- Running a hose from the "OUT" of the black box to the wastegate, and from the "IN" to the turbo, without any "T" connection. Simple, but good working??

2- Locate the "Boost Pill" and "Precontrol Pill" hoses. Cut theses hoses in half. Use a "T" connector to connect the two halves of the hoses from the Watsegate Actuators. Then connect the other two halves to another "T". You should now have both wastegates connectted. The wastegate will connect to the "Out" side of the stepper motor. The "In" connects to the other set of hoses "T"'d form the fork looking nipple.
About this one somebody said that by doing this you will be trying to control both the prespool and the wastegate at the same time, so this is WRONG. You only want to tap into the wastegate not the pre-control.
Well, if this one is wrong there's still another possibility:

3- To tap only the wastegate and not the precontrol actuator, and run this hose to the "OUT" of the black box. If this is the good one, where do I have to run a hose from the "IN"?

Well, so this is the problem I have. I know there are a lot of you with the profec B installed, so which of these possibilities is the right way??

 

i use version 2 with no ill effects. it has quick spool and a super smooth transition.. same boost in primary and secondary turbo.

 

ok, no ill effects...

 

im doing version 2 aswell and its been working great with me

 

So version 2 is the right one?

 

I still have one doubt. I don't know if I'm working in the wastegate. Is the wastegate the one marked in the pic? I don't know, cos in theory just under the wastegate I should also see the pre-control actuator, but I can only see this one!!

And the question is; if this one is the wastegate, which one of the hoses do I have to run to the greddy black box?? And which is the one I have to cap??



Give me a hand, guys!

 

http://www.rx7.org/Robinette/profec.htm

There are two actuators, the wastegate is the one on top.

 

Nice! I've already found both actuators I was searching in the wrong place.

This is what I've done:



The original hose going from the stock solenoid to the wastegate has been capped.

What do you think about this configuration? I've seen others with it...

 

no... you have to use the nipple on the front compressor housing.. you will see two right next to each other...

 

yeah your using the wrong nipple...

My stepper says "COM" and "ON" not in and out... Which one is which.

 

No. Greddy manual should be really easy to follow!

The line from the primary turbo housing goes to the "NO" port. The line to the wastegate actuator goes to the "COM" port. The line from the intake manifold goes to the controller. Plug both the original actuator vacuum line and the now unused nipple on the actuator.

 

Which one is the line from the primary turbo housing? Sorry, I dont know what are you talking about. Do you have any picture? I thought that you could plug any line with pressure (for example the one from the intake manifold...) to the "NO" port...
And about the other one, I do understand, the one to the wastegate actuator goes to the COM.
And about the third one, the one that goes to the controller, I've used the one I use for my boost gauge. Is it right?

Sorry, but here in Spain there are not good tuners, so I have to try myself...

 

All right, all right... Do you mean this?:

 

Yes!

If you are already using the nipple on the intake manifold for your boost gauge, you can make use a T-junction (should have came with the Greddy controller) in that line to feed boost to both sources.

Where did you decide to mount the solenoid? A good place is by the fan relays (where the Pre-spool controller is shown in your photo) or up on the fender wall behind the ABS system (assuming left-hand drive car).

By the way, your English is pretty damn good!

 

Thanks for the info man, really.

I've used a T to feed boost to both sources.

I've mounted the solenoid in the back of the ABS pump (yes, LHD). Tomorrow I will test if all of it is working nice.

 

While Steve Kan was tuning my car, he said that using that particular "boost gauge nipple" for the Profec's boost read was causing it to go into warning and limit mode way too often, even with a +1-1.5psi warning margin. That prevented me from getting smooth power at peak rpms/boost (you should see my scraggly peaks on my dyno sheet).

Steve suggested moving/t-ing it to a nipple closer to the throttle body. I did that over the weekend and now rarely goes into warning/limit mode.

Of course, YMMV, and if it works for you at the boost gauge source, go for it.

 

Interesting. I run my Greddy off the UIM nipple, but my boost gauge is T-ed off the MAP sensor line.

 

Why am I always having problems with everything I'm doing to my FD? :smiley_12

Well, today me and a friend have gone for a ride with the RX7 in order to tune the profec B. We have done the low and high settings, set boost, gain, warning, etc... But nothing has happened. Always around 7 psi, while low or high mode. Nothing has changed. This is the installation done:



There is some people running this set up, so it should at last work!! So now I'm thinking it must be a greddy solenoid problem or a wiring problem. What do you think guys? Do I need a replacement solenoid from greddy????

 

I would suspect your electrical wiring installation at this point.

 

Do you mean the valve unit harness??

 

Yep. It sounds like the solenoid is not getting power, which is why you are 7 psi no matter what you do. Either that or the solenoid is bad.

 

So it's sure it's not an installation issue, isn't it? If my car with the profec installed is running 7 psi that should mean that the installation is right... Or am I wrong...

 

it doesn't mean anything.... your selonoid could be bad, your wiring could be bad, or the instalation could be wrong. your car will default to a 7psi all the time if any of those things are wrong because that is what the waste gates are set at

 

From what you've posted, the physical installation is correct, so time to look at wiring and the solenoid itself.

 

Hi again. I've already discovered which was the problem. The problem is the main unit, there's not electric signal going out from it. We've used a friend of mine main unit and the Profec worked, so wiring and solenoid are right. I'll talk with the user that sold me the Profec B, cos the main unit is not useful.