I have seen this debated a few times, but I'm looking for some evidence on which method of ProfecB installation is more suitable for the stock twins.. Hook the solenoid to the wastegate only, or hook the solenoid to both the wastegate and precontrol?

well I have tried both. First i tried just the wastegate. It works ok. 2nd, I tried both, wastegate and pre-spool. It behaves the same to me. It looks like the 2nd way is kind of better because it kind of spools quicker.



I did both ways, as I'm trying to figure out why i always loose a pound or 2 by redline :(



Amel

Interesting... Anyone else?

i have mine running both. it holds nicely and no creep

How guys hooked it up to both? Did u used a T-fitting? Also is the the new type spec 2 version or old version?

I'm talking about the old one..

Can u explain to me how your stepper motor is? I want to compare mine to the old type. The new type has 3 port, "no", "nc", "com". From what I have read & ask question from this forum, They say that com goes to the wastegate and the no goes to the turbo, and I question that cause according to Greddy site nc should go to the turbos. How did u guys hook up your unit? khris

This might help you Sinful.



Amel

Hey thanks alot for that pictures, does that work with the type 2 profec b controller too? khris

I don't know anything about profec spec 2. If it's similar as the old one then probably it might work.



Amel

Ok I got the picute good, but I can't firgure out what part of the wastegae & pca to cap? Last weekend I hook only the wastegate to the profec b, in otherwords I removed the short host run it into the in port of the stepper motor and com port to the wastegate. Now if I use a T-fitting for both pca & wastegate setup where would I cap the wastegte? Casue if u coming out from the out port and using a another T-fitting shouldn't goes into the pca & wastegate side? I am doing reading this diagram wrong? Or looking at wrong?

You should cap this for the wastegate, and also plug the hose that went into that nipple. If you use Version 2, you should do the exact same thing for the Pre-control acuator.



Amel

a little diff picture. you should cap the hose in the Red box. this shows the setup if you use Version 1.



Amel

lol someone is not controlling his boost..... nice crack on the hose

I belive that's Dave's picture.



Amel

Ok guys what is the purpose of capping those lines (refereding to the red square box)? This electric boost controoler is more complex than I bargain for. I have been using the home depot mbc {two valves) since in 95 with no problems and now I deceide to go with modern and It look more complex to me. btw I never cap off those lines when I had the mbc on the car. Can some explain to me the reason why, sorry to be dumb head I am ver curious to find out why cap those when the boost is building from the stepper motor?btw I am planning to use version 2.

Those two hoses recieve the vacum signal from the stock solenoids - If you're using a MBC then you leave them in place.. When you switch to the electronic controller, the solenoids are no longer required to signal the wastegate to open, so you remove the lines and cap the port. Capping the port ensures a reliable signal from the stepper motor.

Ok got the pictures now, thanks alot everyone. khris

btw the lines that goes to the soleniod those need to be cap too? Also does anyone know how to program the profec b spec 2 version? I brought it used which means i got user manual neither directions on how to installd it. thanks, khris

btw for those who is atempting to do version 2 expect to see alot over boost at transitions, I have try it and I have set my level to 1 in low and when I test it I hit over 15 lbs of boost.

Well, I started to plumb my profec.. which one is the wastegate actuator again? the top one? https://www.nopistons.com/forums/pub...1047683664.gif

ok here goes the short hose is which u need to remove complete put a long hose on the turbo side run it into the "no" port of the steeper motor and then from the stepper motor "com" port run it into the wastegate. The short hose is right there once u had removed everyting {intake wise} u will see and u can't mix it up with the long {pca} because u don't need to removed that hose. Like I had said earlier if u do version 2 expect to see alot of over boost at transitions, also I went by greddy webite to get more info on how to program the probec b. Anyway guess what I was doing it exactly liek they mention on they site even thought I don't have the user manual.

Hey did u get a chance to try the controoler yet? What setting did u set your at?

damn no-one can't give a set mark where I can have the gain setting set at?

every car operates diff. it took me couple of hard runs to get the balance knob where it's suppose to be. Your best bet would be to do as I did.



Amel

I just need an idea where do u set it at like is 2 or 4 or set it at the factory seting which is the 7 as the factory spring operate at. Also do u just use the knob alone for boosting? Also the set gain do u play with that or just the know alone? My setup right now is 4% @ the set gain and 2% with the knob and when thro it in 3rd and floor it the damn thing over boost on me hitting 15 pounds constantly in either 3 or 4th gear. any idea why it will over boost? I only setup the turbo to the stepper motor and to the wastegate. thanks, khris

Khris, I just got my FD back on the road. I'm working out the boost control right now. How far along are you? Maybe I can help more since I have it running and have played with it a little bit. I'm having problems getting the Primary turbo to stabilize, but when they're both online, it's running really solidly. Ever seen that?

disregard, enabling email notifications..

Hey I still have problem, I can't go pass 10lbs in 1st gear, and above 4500 rpm I only can make 8-9lbs. Anyway right now I have the gain,set ans set gain all set at 14%. Is there a step that I miss,also anyway have the right 12-10-12 pattern? please help. khris

Yup that was a pick I used in the non sequential thread. I pointed out in the post how I was over boosting due to the cracked hose.

Oh, and also, are you seeing a steady 10PSI on the primary turbo? Or does it bounce off 10PSI like mine does?

well according to the instruction, u need to have the set gain (start boost) boost to close to your regular boost level the set gain is the same as the start boost. Before I continued let me explain my expriment I did tonite, I removed the hose from the "NO" port and installed it in the "NC" port and I test it with lower boost setting's the car overboosted like crazy but I pass the 10 lbs mark, I also did not set all 3 level back to the start, start from 2% then raise it as boosted build up.

Anyway I put back the hose in the "NO" port and I had to adjust everything again, right now have the start boost set 14%, gain 14%,regular 14% and I hit close 11 lbs in 1st gear, above 4500 rpm I hit 8-9 , I am thinking that there is something I am missing or the unit does not work with 2nd turbo, which I think it's stupied why would greddy sell a unit that won't work proper. khris

Hmmm... I'm seeing the opposite.. low boost on the primary, and normal boost on the secondary. are you sure you plumbed it to the correct actuator? I can post a pic if you'd like..

please do, because this **** is driving me nutz.