RonSSNova

iTrader: (3)

Hey guys,

Because I myself just recently graduated to a manual controller on my car, I'm not real familiar with these various electronic controllers.

Car is single Precision ball bearing turbo of unknown size, Tial 44mm WG.
Built by Stage 6 performance. Very nice setup.

I downloaded the Profec instructions and set to tuning it.

I'm having trouble getting a flat boost curve. I have it at 9psi currently.

So I looked at the plumbing of the control valve. 3 port, one is open.
There is nothing connected to the top of the gate. The controller is connected between the boost source and the bottom port.
This isn't what the directions show.

Obviously it "works" as I'm able to increase the set duty cycle and increase the boost. But is it correct? Is it possibly why I can't get the boost flat?

BTW, thus is a JGC 6.1 Hemi.
:-) Very cool car. I've tuned a few now. Don't worry, I won't convert.
Ha!
If you have ever been inside the hemi, it's very LS like. Except for the heads of course.

Thanks for any insight.

Ron

stevieturbo

Firstly...be more specific than "Profec"

Then draw a diagram of exactly how YOU have yours plumbed.

And what spring are you using ?

focktq

iTrader: (1)

if you mean greddy profec then throw it away.

RonSSNova

iTrader: (3)

I'll draw up a diagram this evening.

It's the goofy one with the single round dial/button

stevieturbo

Greddy made several in the Profec range over the years, hence the need to be specific. They are good controllers when set up correctly, and easier than some stuff out there.

RonSSNova

iTrader: (3)

Got ya.



Here is the routing.
Port 1 is the boost source. Comes from the intake manifold.
Port 2 to bottom of gate.
Port 3 open.



I don't find a description of the ports in the destructions.

At any rate, it does function. I'll keep playing with the gain.
It's not bad, boost is now flat within 1 psi

stevieturbo

Looks like it is plumbed in the most basic way, so no problems there.

0% duty all boost is fed to the w/g to blow it open

100% duty no boost will reach the gate, max boost is dictated by spring only and whatever exhaust pressure is acting on it.
Depending on EGBP this could be very high.

In the most basic way... Place ALL values in the unit for boost control to zero.

Use "Set" to adjust the valve duty to achieve roughly your desired boost pressure. Using this alone is little different to a mechanical bleed valve.

If boost starts to fall at the upper rpm's, you can start adding numbers to "Gain" to try and reduce this happening. Too much gain can cause boost to become erratic or spike.

Then in order to try and assist spool, You can adjust the "Start Boost" value. Keep this below your desired target boost. If it's too close or higher, again boost may spike or become erratic.

But regardless, always start with low numbers everywhere and work through them in the order above. Low number may be 1 as opposed to 0, as sometimes 0 can turn off functions altogether.
Although you may need to play with it a little after.

RonSSNova

iTrader: (3)

I ended up at 45% duty cycle.
Gain at -7
Start at 7.3 psi.

Perfectly flat boost line at 10psi.

I figured out the gain would go negative by accident....

Setting it up was like playing whack-a-mole.

You will love this:



That fine air filter limited boost to 5 psi no matter what I set the controller to.

Thanks for the help!

Bad Apache

I have an old pair of gym socks for him if that air filter doesn't work out. lol

stevieturbo

I'll never understand why people want to stick **** like that in front of a turbo or engine etc.

And it actually looks like there is room for a half decent filter !

RonSSNova

iTrader: (3)

Yes, there is. I will build something nice that gets the inlet out of the heat.
A meth kit would be nice as well.
And a forged short block.....
And, and. :-)
Our customer bought it like this, we get to make it better.

stevieturbo

But interesting all the same at how restrictive it was !!

Seen one a few years ago, Subaru that wouldnt run right boost right, was dead as **** everywhere. Car seemed mostly standard too...so strange.

Turned out to be some shitty blue egay replacement panel filter was the problem ! It was strangling the **** out of it. Had never seen anything like it before, or since.

RonSSNova

iTrader: (3)

I can sell you this one cheap!
When I took it off, boost shot up to 20psi......good thing I have a fast foot!

forcd ind

iTrader: (7)

Even at the track with a large K & N, then rem. it I picked up a couple PSI, so I can only imagine what that thing is doing-except making the seller some money, lol