Profec B Spec 2

[27psiBOOM]

are you guys getting a ticking noise on boost with the profec B? is it possible to avoid this from sounding?

[dlsolo]

Welp, got my Spec II installed and running.  I love it.  Just handles boost so much better and the lo to high on the fly thing is a huge perk.  Gotta quick question.  Once in a while I will hit a soft limp.  Usually at part throttle (0-5psi).  Anyone have this issue and have a suggestion to this?  I have searched around on 3 different boards and can't find an answer.  So I come to the pro's and guru's of dubs.  Any help would be more than appreciated.  Thanks.

[kappone]

Hello from Athens,

i just installed the profec b-spec 2 , but im not sure if the instal is o.k.
what have jou done with the n75? could someone explain  the instalation and what to do with stock n75?

i am driving a new beetle 1,8t , chiped , k03 turbo, k&n , 63,5 cat back exhaust, camber 3 degees, zimmerman brake rotors, weitec 3cm lower , audi s3 front anti roll bar.

Best Regards,
George

[elitedübs]

welcome george

just leave it electrically plugged in and tuck it away somewhere. i stuck mine under my CAI.

[kappone]

Hello again,

first of all i have to thank minesfasterthenyours who toled me about this great forum!!!

o.k. with the electric part . Have i to plug up the 3 open ports on the n75?

Thanks

[elitedübs]

i'd like to thanks minesfasterthenyours, for spreading the word around.

you don't have to plug the ports up. i didn't. i know some who have.

[VWR18]

Is there any of you that have mounted a profec B spec II in your 1.8T´s with Nowire and Map-sensor,
does that make any differance?

Do you get any faultcodes like " boost regulation " too low/ too high when you change the given boost level from the ecu too the N75????

[transient]

Is there any of you that have mounted a profec B spec II in your 1.8T´s with Nowire and Map-sensor,
does that make any differance?

Do you get any faultcodes like " boost regulation " too low/ too high when you change the given boost level from the ecu too the N75????

Sorry.. don't know where to help you..

It sounds like most of you use this EBC on an internally gated turbo.. maybe there are some of you with experience with an external gate

Mode 1: For an external gate, I have boost pressure going to the NO (normally open) port on the Greddy valve, and the COM port going to the bottom nipple on the wastegate (same setup I was running with an MBC).  In this configuration if the valve fails, I'll only see a max boost  equal to the wastegate spring.

I am, however, having some issues with boost consistency using the above configuration where the boost bounces around randomly from 4k, and then spikes at redline.

Mode 2: The Greddy manual says to use the NC (normally closed) port with an external gate and have the COM port go to the top nipple while a second boost line goes from the compressor housing to the bottom nipple.  The Tial manual says to have a "vent" on the line between the boost controller and the top nipple of the gate, but I have no idea what to use for a vent other than drilling a hole in a fitting.


Does anyone have any experience with an external gate and the profec II B?  If so, what mode are you using (from above), and how does it perform with what settings??

Thanks in advance guys.

[transient]

Switched to mode 2 this morning and still have a haphazard boost curve no matter what combination I use for SET and GAIN.  I still see about a 5psi wildly swinging boost value once my turbo is in it's boost range.

I'm starting to thing I have another issue other than the boost controller..

it is nice, however, to be able to control the boost level from the cockpit


Any feedback from you guys with external gates would be good too

[kilmer420]

Adding the in the end for Big turbo guys with Wastegates that have a top and bottom nipple.

If you are running the profec B spec II EBC then your line setup will be as follows:
On the solenoid - make sure that you have "nipples" couming out of COM & NC port. Also make sure those are in tight - as any leaks would screw everything up. Then, run a line from the compressor side of the turbo to the bottom part of the wastegate.
Measure how much line you need to go from the TOP of the wastegate to the COM port. Run that line & hook everything up. Then find a good place to "T"-into the first line that we run & put a plastic T in it. & from that nipple run a line over to the NC port on your solenoid.
Recap - COmpressor to bottom of the wastegate - also tinto this line & take it to NC port. Then run a line from COM to the TOP of the wastegate. & you're all done.

Wastegate is being closed shut by the spring inside of it. You run a line from the turbo compressor to the bottom of the wastegate. As the turbo builds pressure so will the pressure on the underside of the wastegate increase. This will push up on the spring & open up the wastegate. Now, it is obvious that any leaks in this line would result in no pressure buildup on the bottom of the wastegate so it would never open. Causing your boost to keep rising.... So, - when you T into this line it goes to the NC port (Normally Closed). So, no leaks would develop. Now, top of the wastegate is open to atmosphere. BUT - with profec - when the solenoid activates - it will open the port from NC to the COM (com goes to NC & NO - & when one is open the other is closed). SO, what is going on now is that you're sending pressure from the turbo to the upper part of the wastegate as well & this will press down together with the spring to keep the wastegate shut. So, boost keeps rising. Once desided boost is achieved - the solenoid will start closing a bit - shutting off the pressure going to the top part of the wastegate & causing the wastegate to start opening. ALso, every time you're sending pressure to the upper part of the wastegate - you're also decreasing pressure to the bottom part of it. & vice versa. /

[dlsolo]

Well, I know this is digging up the past, but I have FINALLY gotten this boost controller to work EXACTLY the way I want it to.  The biggest part of that was setting the SET GAIN around 2-3psi close to the MAX BOOST.  I have been doing 5psi less than MAX, 8-10psi less than MAX.  I use to keep hitting the limp and it dropping down to 80% and back up, down, back up, down, back up.  It was driving me crazy.  But now, I set the SET GAIN to around 2psi less than max, the GAIN to 3% and it is rock solid!!! 

Anyway, just wanted to share.

[BboyRonnie]

Funny you updated this. I was digging around looking for info on the Profec B 

[inivid]

iirc, a 2-3psi variance between GAIN and MAX is recommended in the manual.

[dlsolo]

Yeah, but if you search around the big VW/Audi sites, you get that 4-5psi less then max would work better because you have more room to tune the GAIN.

I was cleaning out my closet and found the little manual.  Saw that, went out and made the changes.  Love it! 

[dlsolo]

Who else uses a SPEC-2?  I'm wondering if anyone else as some weird hesitation issues in the Hi mode.

[GTIguy20v]

I ran one in my GTI 1.8T.  I had some issues with it and switched to a Turbo XS High Performance manual boost controller and it was 1000x better.  Because of this experience, I love MBC's and will never go back to an EBC's (no offense).

[dlsolo]

See, that's what I hear from a bunch of people.  But I just like having the option to switch between LO and HIGH.  That way I have, in a sense, 3 modes (to include OFF). 

I'm wondering if it's worth looking at the newer Greddy EBC.  Or maybe another brand EBC.

[GTIguy20v]

I have a good buddy with a 300zx tt and he has an A'pexi AVC-R.  He loves it.  I think its prob one of the better EBCs on the market.  If its the modes that you like, there are still some options for MBC. Turbo XS makes two different dual stage and a quad stage MBC:

http://www.turboxs.com/shop_prod.php?what_category=1