i think what rynberg might have meant is that some 95 cars have the restrictor pill built into the nipple (not the case with my 95 car, for some reason). Therefore he wouldn't have any pills in those lines.

 

Damian, try to close the precontrol a little bit.
Thus not giving up as much air to spool up secondary.
But doing this may reduce or slowdown the secondary at transition.

Reza

 

i have tried that already, it does not solve the dip and slows the rise... makes it worse lol :-)

 

What about vacuum line size?
I am using a bigger ID lines, maybe that has some effect.
Or smaller than stock?
I don't exactly know. But my drop off and rise seem okay, only that after 6K the boost drop to 8psi, the wastegate is fully open, I think the ECU is non feedback system thus it just fully open after 6Krpm.

Reza

 

reza, i have herd of many cars that drop to 8 by redline, some say that it is normal operation.

my vac lines are same size as stock, just silicone instead of rubber.

 

I am using bigger than stock size lines. So you may want to try change to bigger ID lines for the wastegate and precontrol. Perhaps that makes a difference...
What do you think?

Reza

 

hmm, dunno...

 

On a side note, I'll mention that I dealt with a 12-5-12 pattern for a while (I could never get prespool, even when I plugged the line to the PC solenoid!) , only to discover that my mechanic was controlling boost by putting restrictor pills on both sides of the wastegate actuator. Of course, the stock pills are on the primary turbo-WG actuator hose, but he was reducing boost by adding a 2nd pill on the actuator-solenoid hose rather than drilling out the original pill. Even though what he did accomplishes the effect of reducing boost, after experimenting with the setup I'm quite certain that this setup also has the undesired effect of allowing the wastegate to open early during prespool, not allowing the secondary turbo to get enough exhaust energy. After removing the 2nd pill and using an appropriate carb jet in the stock pill's place, I was able to get a 12-8-12 pattern (still a problem, but I'm prespooling now).

 

Reza, you are completely correct. My car did the EXACT same thing until I got a Profec B. Once I installed the Profec, I immediately got a 10-5-10 boost pattern, falling to 9 after 7500 rpm or so (probably the stock cat restricting).

ES:

Alien7 is correct, 95 turbos are not supposed to have pills as the restriction is built into the nipples. Perhaps my problem IS related to that. Well, I have some investigatin' to do.

 

>>Alien7 is correct, 95 turbos are not supposed to have pills as the restriction is built into the nipples. Perhaps my problem IS related to that. Well, I have some investigatin' to do.

I find this interesting since my 1995 DID have pills in the turbo lines when it was in stock form. Very odd.

 

Did anyone get this resolved yet? What boost controllers are you guys running. I noticed other people had this problem after running the Profec-B.

I was tuning the Profec-B on my friends car, and I noticed he was always pulling 5psi at transition. I.E. 10-5-10, 12-5-12, 14-5-14. He thinks its always been this way. We tried different combonations with the pills in the prespool actuator line, and it affected the primary boost, but not the transition at all. The turbo's are Enfini turbo's with about 150miles on them. This definatly leads me to believe a solinoid problem. Any help is appreciated.

 

This is normal operation. IIRC from the manual the boost drops to 8psi at 6,000 rpm and holds there. So you go 10-8-10 until 6,000 and then you go back to 8. My car has always followed this pattern.

 

I'm stuck at 10-6-10 for a while. Try attaching your boost gauge to the nipple at the back of the Y pipe. This will show you how much the secondary is spooling up. I bet you only get to 5 lbs before transition (4500). You can speed the recovery up some by setting the length of the Turbo Control Actuator rod so it is just barely closed with the car off.

 

Crap...I installed PFC, removed by HD valves.
Now I got this boost pattern: 13.5 - 5 - 10

Help! Somehow PFC prespool less than stock ECU.
My setting now are:
Pri .80 90%
Sec .80 70%

I played with the setting a bit, then I got: 14 - 5 - 10
Pri .80 40%
Sec .80 70%

With PFC stock setting of pri .80 56% and sec .70 64%, I got: 14 - 5 - 8

It always goes above the target. Will PFC learn?