Boost controller

[jesse dobbin]

Hopfully this one is not a dumb question like the last of them I have searched re searched and searched again many mixed reviews on it and I was wondering if one of you guys can give me an answer I recently purchased a greddy profec ebc I was wondering if the vacume hose needs to go to the fpr or can I just run it off my bov some say it dosnt matter some say you need to run it off the fpr any ideas it's a greddy profec a spec
Thanks Jesse.

[Brett Haviland]

no don't use that line.  leave the fpr on its own signal with maybe only the boost gauge t-ed off it.

use the boost output line on either the turbo outlet pipe (1g) or off the compresser housing (2g)  that is the correct source to use for the boost controller.   You don't want a signal that has vaccum as well for a boost controler. (as far as I know anyways).  You want the sourse to be as close to the compresser as possible for quickest response.  also the use of short vac/boost lines is recommended as well

[jesse dobbin]

There are 3hook ups and one bleed valve on the back I assume one goes to the actuator one goes to the charge pipe and it said the other hose to intake or fpr where should I put the the 3rd one if it's not on the fpr

[jesse dobbin]

http://www.greddy.com/upload/file/PRofec_AB_helpdia.pdf

[Brett Haviland]

looks like the profec b uses the intake line to just display the vac readings on a display unit? sorya like a boost gauge?


if I remember correcty now the apexi avcr has a "map" sensor for the same reason.   if this is the case then yes, you could use the FPR line for this signal cuz it doesn't bleed the pressure off like it does with the boost source it uses to control the wastegate.

[jesse dobbin]

I'll try it out thanks for the help I thank you good sir

[Brett Haviland]

does the profec b have a map sensor?  I imagine it has a solenoid with two ports on it... or maybe the vac lines (from FPR) goes directly into the profec b control unit/?

[jesse dobbin]

I have no idea mines the a spec and I've never installed one before the tunning of it sounds pretty straight forward I red the manual 6 times just to make sure I understood it lol

[Brett Haviland]

well take some pics of the components in the box, post them and ill tell u what it is

looks like the profec "a" has a single unit that controls the solenoid for boost control, but also has a MAP sensor built inside the unit so it can detect vacuum as well as boost.

[jesse dobbin]

I don't know how or els I would lol I can email you some if that works for you

[jesse dobbin]

I sent you some pictures any insight you have would be grately appreciated

[Eddie ly]

That 3rd line to anyone manifold vac/press source. T it off you bov, fr...ect.

[jesse dobbin]

Eddie ,Brett you guys are the bees knees thanks for te help

[Brett Haviland]

yup, instead of tee'ing off the FPR line, Tee it off the BOV line like eddie said.  im always hesitant to tee off the FPR as if something blows off on the FPR line, and it looses boost in a WOT pull and lets say your running 20-30 psi of boost, well the fuel pressure will also drop 20-30 psi and it could possibly lean out and detonate causing internal engine damage in worst case senario

[jesse dobbin]

Well looks like I won't be installing it as my clutch is starting to slip and I don't want to get an improper reading when tunning it so first things first new clutch time