I just installed the ProfecB SpecII in my 93 FD. With it off I am seeing the 7psi I should be seeing. I have no been messing with the damn thing for the better part of the week and cannot get the boost right. Does anyone have theirs properly tuned? My car basically have every bolt on, the next step is single turbo. My boost will hold 10psi but then when the second turbo comes on it drops to like 5psi and then rises. I can't get the damn thing to work right. Anyone? My settings are 53% Set, 10% Gain and 90 Start Boost. Thanks for any help.
Mike

 

Hmmm. I can't help but I will be watching this thread. I might be getting a profec B in the future and boost control is something I need to learn more about. Maybe I can learn from your problems so I don't run into them .

Good luck!

 

What was your boost pattern before you installed the profec? Could it be that the problem isn't with the profec at all? And if you didn't have a boost problem before you may want to check and make sure everything was installed correctly and all vaccum hose connected correctly.

After that, did you change your pre-control line by removing pill etc..? You may want to install a valve in the pre-control line to fine tune your transition. I had a large dip in boost on the transition and after installing the valve i have almost a perfect 10-9-10

I would give you my settings but I don't know them off hand but I will try to get them up tomorrow... If it will help u any.

Do watch your boost with the profec though, I have found that climate changes greatly affect my boost pattern. Causing me to constanlly adjust it w/large changes in temperature.

Mitch

 

you're turbo control actuator isn't working properly, or the butterfly in your y-pipe isn't opening

 

How do you have it hooked up? controlling the wastegate only or both the WG and pre-control? it should only be the WG control.
The Boost controller should not be affecting the transition if hooked up correctly.( meaning you aren't tuning a seperate level for the secondary turbo)
Also, What 93BlackFD said is the most likely culprit. Sounds like the typical chase your tail vaccum line or component search. But start with those 2.

 

I have same problem and haven't found the problem yet.

Did you cap off the 2 hoses at the wastegate actuator (I think it is) ?

 

profecs suck for rotaries. F-cons suck even more!!!!!!!!!!!

 

i am sure you are not talking about the F-Con V/ V-Pro. It is one of the top ecus in japan. I guess tuning for state side is lacking

 

profec B 2 has some sort of spike protection thingy.. ur problem is normal.
you just have to tune it right. It's pita i heard... thats why my friend sold his

 

Whats your warning set at? i run 36% 6% 3.5 psi hold at 11.5 limiter at 35%. i get a consistent 10.5 boost and the responce and pull is really good. Try it and let me know.

 

If you removed the stock precontrol line (with pills), put it back in. You can really cause problems by removing it.

 

I have mine in non seq and it works well, just took me a while to get it set is all

 

my settings are as follows.
set is at 26%
gain is at 12
set gain is at 14%
boost warning at 12 psi
boost limiter 40% which drops the psi by 2 psi once the warning is triggered.

The trick is to find the right setting to just below the boost warning.That way you dont triger it and then you lose boost.I have also noticed that with a vacuum leak or problem you generally have to set the profec b settings higher in order to compensate for the loss of boost.In turn your turbos work harder which sucks.Your set gain is insanely high.So is your set value.Which tells me that you have a massive leak somewhere.Find it asap.Do you still have a catalitic converter? also the gain feature is what keeps your boost constant at higher rpms.So if your boost drops off at high rpms raise the gain at 2% increments until you get the results youre looking for.I got this info from the manual.So you may want to look it over again and see if you can find any helpfull info.

 

It is difficult to set, but once it is set you don't have to touch it. Steve Kan tuned my car back in January in very cold weather and I haven't fooled with it since.

Boost holds perfectly in low and high settings. It is now hott as hell down here in N.O. and boost controller still holds boost EXACTLY where it was back in winter. Low setting at 10 psi. and high setting at 16.7 psi.

 

Just crack open the wallet and whipe the dust off of it and buy a real boost controller like the Blitz SBC-ID. The best controller out there.

R.K.

 

Ok, well first let me say you all have been very helpful. I have been doing some searching and troubleshooting and have diagnosed that it will just take more time to tune. There is only one problem, I have zero patience!! Nah just kidding, but I am putting a T04R on the car in the next six weeks. I will use the boost controller for that and see what happens. Till then then motor will be coming out and all sorts of things done in the meantime. I will try some of the settings you guys came up with. Thanks for the help again, I'll tell ya what I find out.
Mike

 

by the way, I know where to get Garrett TO4R's .96 A/R undivided or 1.0 A/R Divided for $899.00 if anyone is interested. Also any manner of Garrett turbo for pretty cheap!!

 

I'm reffering mainly to older versions, but none the less it's true. Tuning here in the states is not what it should be for those two units. It seems in Japan they can make anything work and work well.

 

make sure the dip switches on the back are correct for sequential turbo operation first!

then make sure the pills are removed.

also some profecBs were known to have problems from the factory.. i had one that never worked, needed a new control unit.

 

Mine is the Spec II, so no dip switches for me!! Thanks though you guys