im currently running a greddy profec-b with my apexi pfc and the profec doesnt do anything. i have the pfc set up for 13lbs and no matter whether the profec b is on or off i still get 13 lbs. whats wrong?

 

i dont have the pfc, but isnt it supposed to control boost also? why the need for 2 EBC's?

 

Id like to know too....

 

yup yup, it is but i got the profec-b before i got the pfc. i was originally running a pettit ecu so i needed the profec-b to specify my boost but now it doesnt do anything. does anyone know whats goin on?

 

did you remove the pill from the wastegate line? I have the profec b and the pfc and I just set the pfc up for 1.2 bar and I use the profec to control boost. Works just fine.

 

heres a crappy drawing of my setup. the lines going to and from the stepping motor are new and dont have any pills in them. does the vacum hose that goes to the prespool have a pill in it too? should i hook that line up to the stepping motor as well?

 

i just took the car for a spin and tried to adjust the boost via the pfc... and nothing. it stays at a constant 13lbs no matter what boost i set it for. now im pretty sure that i did forget a pill. can someone tell me and hopefully show me where this devious pill is? thanks alot guys

 

Did the Profec work before the PFC was installed?

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

 

 

You guys are forgetting the most important part. Cap the back side of the actuator. That line is what lets the ECU control boost. You need to remove that line and cap the nipple on the actuator or the profec B will not work correctly.

Jason
www.rx7store.net

 

ok great. so what ive done so far has been correct, all i have to do now is remove the other vacum hose fron the wastegate and cap it off right. thanks everyone

do i leave the restrictor in the hose that goes to the pre-spool actuator or should i remove that one too?

 

in this pic there are 3 blue hoses and one black one. i have to cap the black hose at both ends correct? then the profec-b will work perfectly?

 

oopsie, heres the pic.

 

You only need to cap it on the actuator. You can just let the hose hang there if you want.

Jason

 

ok, i capped the actuator off and went for another spin. this time with the profec off i would get a nice 7-8lbs on the primary, in the transition it dropped to about 5-6 and then it soars to 14lbs on the secondary. is this common with my mods? i know that you can get some nice spikes with a midpipe but to get a 7lb spike??? thankfully my O2 reading was 0.91 with 90% injector duty at the 14lbs. if i turn the profec on now and turn the boost to 10 then its possible that ill spike to 17 on the secondary? what can i do to remedy this?

 

Alright Im having a similar problem. I installed the lines to the turbo and the wastegate without capping the lower end off. im having a difficult time getting this tunned.im getting erratic boost , prmary boost ranging from 9psi-14psi and about the same in secondary mode.It varies each time. i think I may have missed something on the install?
Also at about 6,000 rpms in secondary it does a strange "shut down" or venting where boost drops off almopst completely. This doesnt seem right to me. So anyone have any suggestions
mods pfs intercooler, apex cat ,pettit downpipe,j-spec 99 turbos
crooked willow intake other mods but seem unimportant for this topic
thanks

 

Have you adjusted the switches on the back? I don't know if that would have any effect or not, just trying to figure this out before I install mine.

 

Yea the dip swiches on the back for a third gen should be set on..off..on..off. I've also tried a few of the recomended settings none of which seem to help. I dont know if anybody else has heard of this but my wastegate line [neww 99 spec turbos] had no restrictor pill in it when i removed it . iIs it possible that the PCA lines have the pill missing as well ,guess I,ll have to look .Still need any suggestions
THANX

 

You need to cap the backside of the actuator. If you are getting large boost spikes, remove the pill that is in the lines.

 

nah, i havent. ill try to play with it tomorrow again. im gonna try setting it to the lowest boost and play with the wastegate adjuster and the dips at the back. ill update on my findings, hopefully ill have some good news

 

ive already removed the wastegate pill and capped the otherside. should i do the same for the pre-spool/pre-control actuator. should that help with the spikes?

 

Supposedly on the 94+ turbos, the restrictors were built in and didn't use pills.

 

so guys, should i remove the pre-spool/pre-control pill as well?

should i hook up the pre-spool/pre-control actuator up to the stepping motor as well?

should i cap off the other side of the pre-spool/pre-control actuator?

help needed

 

this is crazy, why don't you put it all back to stock and sell the profec B? the PFC controls boost just as well.

just an idea.

 

i prefer having to turn a single **** on my dash to change boost rather than constantly having to program it in the pfc. any advice to my previous post?