Chameleon

Thanks rynberg! I appreciate it.

TulsaTurbo

The POV is a safeguard issue. It protects your engine from overboost situations.

For example: The line to your wastegate pops off, or in a case here recently, the line melted from resting on the exhaust manifold. You will never react fast enough to keep from overboosting your vehicle. By the time you see and figure out what happened, its over.

The guy, mentioned above, with the melted line to the wastegate just had his engine rebuilt when this happened and yes he blew out the rear apex seals. A POV would have prevented this sad tragedy.

The additional function, which is purely coincidential, is that you will not go over the boost that your POV is set at. So in a sense it does help with boost creep and spike issues.

Some people believe in its use, as well as myself, while others don't. Do the math: The cost of around $100 for the POV versus the cost of an engine overhaul or replacement if the the overboost situation arises...

SilverRX7

I am tuning the Profec B as well. Before install I had a 11/10/11 boost pattern.

I did the mainstream install...only touch the wastegate control. I plugged the ECU control line and removed the turbo pressure line and replaced it(I assume the pill is the reduced diameter restrictor in the OEM line).

Now I am only getting 8/6/7 boost. The balance is set at the middle and I can move the low boost setting from min to max without any movement......

Im back to troubleshooting... please help. It seems to me that the profec isnt working at all... so I am going to see if I have the in and out lines swapped ... or the electrical connection from the control unit to the box is not connected... those are the only two things I can think off...

bureau_c

I'm a little confused about something. If you guys are ignoring the precontrol and just tieing it into the wastegage actuator, shouldn't there be only very minimal, if any, effect on primary boost? In other words, if you're at 10-8-10 stock, shouldn't the Profec-B give you something like 10-8-12 if you raise it to 12 psi?

SilverRX7, it does sound like you're operating on wastegate spring pressure only. With the stock solenoid out of the picture and the pill removed, this is exactly what you'd expect. I'm no sure if swapping the in and out will do this but its possible. If the electrical connection between control unit and stepper is not connected then it would definitely cause this.

jds

whitet777

Bureau_c,

You are only partially correct, the profec only controls the wastegate actuator in the standard method of installation. However, the wastegate operates anytime there is boost being made. Therefore, the Profec B continually modulates the boost to try to stay at your set level at all times.

The pre-control only controls when the secondary turbo pre-spools up. Given the standard Profec installation, the Profec will do nothing to the secondary prespool. The gain control on the Profec B will only control the "hyperactivity" of the wastegate actuation and how quickly the Profec reacts to boost pressure differences.

I know the Profec controls both primary and secondary boost because of playing around with it where I was getting 13+psi on the primary at first until I dialed it down.

bureau_c

Thanks whitet777...I think that makes sense to me. This stuff gives me a headache, but I'll think about that for a bit. :-)

jds

SilverRX7

For my issue... with the profec B I couldn't turn up my boost.(see above)

Turned out to be an electrical issue - a loose ground.