Lousy Boost Controller GReddy Profec B Spec 2

Willard Bridgham 3 · 07-23-2009, 01:42 PM

When I rebuilt my 944TS, my mechanic recommended that I install a GReddy Profec B Spec 2 boost controller. I already had a manual boost controller and was happy with it, but took the advice of my mechanic....my instinct was not to install an electronic control circuit in an already-operating manual control circuit.

It was installed less than a year ago and, in early June, I noted that, on my manual boost gauge, boost would go to 20-25 psig and I let off. Reprogrammed the unit again and nothing changed. I called a GReddy dealer and he said to install a new solenoid unit which I did and reprogrammed with the same result.

Took out the GReddy and reinstalled the manual boost controller and voila, I was again able to set my boost at 15 psig. I called Greddy for warranty information and was instructed to remove the unit and send it back to them for diagnosis. I asked them if they would pay for a rental while the controller was out and if they would pay my mechanic for his time.......no answer.

This is a laousy boost controller and GReddy has not yet honored their warranties.

944obscene · 07-23-2009, 02:13 PM

You're not the first person I've seen to have problems with Greddy equipment.

Ian Carr · 07-23-2009, 02:21 PM

the greddy profec is a beast to handle. I would recommend taking it to some one who has installed and set them before. It took me months to get my apexi AVC-R to where I wanted it

George D · 07-23-2009, 03:51 PM

I hate my Greddy Profec B Spec 2. Complete pain in the ass to setup and then it seems to have a mind of it's own. I have to shut it off sometimes to get it to base boost of 15psi, no matter what I do, then it starts working again.

I'm going to replace it with a unit that works like I want it to. You know, set the boost to a particular level and it hits that level. Too much to ask for???!!!

George

OmniGLH · 07-23-2009, 05:03 PM

No experience with the Profec B but way back in the day I had one of the original PRofec boost controllers (the "fuzzy logic" one with the stepper motor) in my Dodge Omni. Fancy piece of equipment, I tried it because a) I was having issues with the PCM controlling boost and b) I like electronic gadgets.

End result: it never worked right. It would consistently forget what it "learned" and would often get haywire boost.

From then on I either let the PCM control boost, or I go with a manual boost controller.

badcoupe · 07-23-2009, 07:12 PM

I just sold my E-01 which is their top of line controller PITA to set up and never consistent even with my tial gate.

Willard Bridgham 3 · 07-24-2009, 10:50 AM

I will x-post this to the racing forum so others aren't duped by this stuff.

kevincnc · 07-24-2009, 11:45 AM

I have a Type S that works great and have never heard any complaints from anyone else. There is just a gain knob, and high/low boost knobs so very easy to adjust.

400hp944 · 07-24-2009, 12:48 PM

I've been running mine for a couple of years completely trouble free. Works great.

Maybe check your installation. Since you have to run vac. lines in and out of the passenger compartment, it's easy to pinch something. Also - check your grounds.

eniac · 07-24-2009, 01:57 PM

I've heard nothing but good things about the Profec-B. I also know a few local guys who run them on thier Hondas and Mistu's with rock steady boost.

These are the sort of complaints I often here about the AVC-R which I run. It's tough to get the boost dialed in but once you do it's steady.

awilson40 · 07-24-2009, 03:54 PM

Quote:

Originally Posted by 400hp944

I've been running mine for a couple of years completely trouble free. Works great.

Me to, no problems at all after several youars of use

DrZ1 · 07-24-2009, 08:06 PM

I ran an e-01 for a couple years no problem, plus I could record and play back my A/F ratio since it served also as my display for myInnovate LC-1. I have it for sale since switching to the Vitesse piggyback which will now contol boost.

Let me know if any interest in it.

Tom M'Guinn · 07-24-2009, 10:54 PM

I've used an original profec B for years with no issues. No programming needed -- turn the knob up for more boost, down for less. Wherever it's set, the boost is rck solid. Can't speak re the "spec 2" but it would be a shame if they changed it.

daigo · 07-24-2009, 11:03 PM

I like my AEM Tru-Boost. Very simple, and the instructions make sense. Good support also.

Iridium · 08-08-2009, 03:51 PM

I run an Blitz SBC i-D III Spec R and it's rock solid, and easy to use. An old Sport Compact Car test ran it against a bunch of other controllers and said it gave the sharpest performance and was a snap to use as well. No complaints with it at all.

07-23-2009, 01:42 PM	#1
Willard Bridgham 3 Addict Rennlist Member Join Date: May 2001 Location: Chihuahua, Chihuahua, Mexico Posts: 392	Lousy Boost Controller GReddy Profec B Spec 2 When I rebuilt my 944TS, my mechanic recommended that I install a GReddy Profec B Spec 2 boost controller. I already had a manual boost controller and was happy with it, but took the advice of my mechanic....my instinct was not to install an electronic control circuit in an already-operating manual control circuit. It was installed less than a year ago and, in early June, I noted that, on my manual boost gauge, boost would go to 20-25 psig and I let off. Reprogrammed the unit again and nothing changed. I called a GReddy dealer and he said to install a new solenoid unit which I did and reprogrammed with the same result. Took out the GReddy and reinstalled the manual boost controller and voila, I was again able to set my boost at 15 psig. I called Greddy for warranty information and was instructed to remove the unit and send it back to them for diagnosis. I asked them if they would pay for a rental while the controller was out and if they would pay my mechanic for his time.......no answer. This is a laousy boost controller and GReddy has not yet honored their warranties. __________________ Silver Rose "When governments fear the people there is liberty. When the people fear the government there is tyranny." - Thomas Jefferson

07-23-2009, 02:21 PM	#3
Ian Carr That Guy Rennlist Member Join Date: Sep 2004 Location: fairfield / bridgewater, ct Posts: 6,457	the greddy profec is a beast to handle. I would recommend taking it to some one who has installed and set them before. It took me months to get my apexi AVC-R to where I wanted it __________________ Ian Carr RLM-050419-5724 86' 951: 99' S70 T5 5spd: 88' Festiva: WWSD - What Would the Stig Do?

07-23-2009, 03:51 PM	#4
George D Addict Rennlist Member Join Date: Aug 2006 Location: Tucson and Greer Arizona Posts: 1,239	I hate my Greddy Profec B Spec 2. Complete pain in the ass to setup and then it seems to have a mind of it's own. I have to shut it off sometimes to get it to base boost of 15psi, no matter what I do, then it starts working again. I'm going to replace it with a unit that works like I want it to. You know, set the boost to a particular level and it hits that level. Too much to ask for???!!! George __________________ http://forums.rennlist.com/upload/89_951_copy2.jpg 02 LX470 & LS430 (daily drivers) 89 951 3.0 six speed 05 Suzuki King Quad 700 Tiara 2700 Offshore 03 GMC Duramax 2500 HD Yamaha Venture Snowmobile

07-23-2009, 05:03 PM	#5
OmniGLH Addict Rennlist Member Join Date: Mar 2006 Location: Huntley, IL Posts: 505	No experience with the Profec B but way back in the day I had one of the original PRofec boost controllers (the "fuzzy logic" one with the stepper motor) in my Dodge Omni. Fancy piece of equipment, I tried it because a) I was having issues with the PCM controlling boost and b) I like electronic gadgets. End result: it never worked right. It would consistently forget what it "learned" and would often get haywire boost. From then on I either let the PCM control boost, or I go with a manual boost controller. __________________ Jim (aka "Omni") '86 951 - Bilstein coilovers, Weltmeister adjustable sways, Weltmeister chip, bunch of other stuff... '03 GTI - Sachs sport shocks, Revo software, Porsche BBK (my DD) '05 A6 3.2q - Navi, XM, BT (wifey's DD)

07-24-2009, 10:50 AM	#7
Willard Bridgham 3 Addict Rennlist Member Join Date: May 2001 Location: Chihuahua, Chihuahua, Mexico Posts: 392	I will x-post this to the racing forum so others aren't duped by this stuff. __________________ Silver Rose "When governments fear the people there is liberty. When the people fear the government there is tyranny." - Thomas Jefferson

07-23-2009, 02:13 PM	#2
944obscene User Join Date: Sep 2005 Location: Tulsa Oklahoma Posts: 1,906	You're not the first person I've seen to have problems with Greddy equipment.

07-23-2009, 07:12 PM	#6
badcoupe User Join Date: Jul 2002 Location: Connersville IN Posts: 1,594	I just sold my E-01 which is their top of line controller PITA to set up and never consistent even with my tial gate.

07-24-2009, 11:45 AM	#8
kevincnc Addict Rennlist Member Join Date: Sep 2005 Location: Where no A/C or traffic reports are necessary, and no bridges or banks have collapsed yet Posts: 1,354	I have a Type S that works great and have never heard any complaints from anyone else. There is just a gain knob, and high/low boost knobs so very easy to adjust. __________________ Kevin Brandon '89 951 Vitesse Stage II/MAF/Chipboard/SMT-6, 3 bar FPR, 72lb injectors, Innovate LC-1, Tial 38, Bursch test pipe

07-24-2009, 12:48 PM	#9
400hp944 Addict Rennlist Member Join Date: Jun 2007 Location: San Diego Posts: 283	I've been running mine for a couple of years completely trouble free. Works great. Maybe check your installation. Since you have to run vac. lines in and out of the passenger compartment, it's easy to pinch something. Also - check your grounds. __________________ 89 Turbo S 2.7ltr Built By "Motorworks" - Tuned By Vitesse!

07-24-2009, 01:57 PM	#10
eniac Addict Rennlist Member Join Date: Jan 2004 Location: Michigan Posts: 1,943	I've heard nothing but good things about the Profec-B. I also know a few local guys who run them on thier Hondas and Mistu's with rock steady boost. These are the sort of complaints I often here about the AVC-R which I run. It's tough to get the boost dialed in but once you do it's steady. __________________ ~Stephen Autocore autocore@gmail.com AIM: Eniac325ix '88 951 White - MAP, AVC-R, big turbo, 86lb/hr injectors, small 130 amp Nissan alternator, Cobra Misano's, cold r134 A/C, 30psi with 35 psi scatter boost, E85(Looking for a decently priced 4" exhaust). NO BELT COVERS! '72 914 - 100% stock w/ Jetronic D fuel injection. 2009 Human Girl - Ophelia - Born Aug 14 at 11:57am. 7lb 7oz. OMG! Ima daddy!!!

07-24-2009, 08:06 PM	#12
DrZ1 Addict Rennlist Member Join Date: Sep 2006 Posts: 574	I ran an e-01 for a couple years no problem, plus I could record and play back my A/F ratio since it served also as my display for myInnovate LC-1. I have it for sale since switching to the Vitesse piggyback which will now contol boost. Let me know if any interest in it.

07-24-2009, 10:54 PM	#13
Tom M'Guinn Addict Rennlist Member Join Date: Jan 2002 Location: Just CA Now :) Posts: 5,648	I've used an original profec B for years with no issues. No programming needed -- turn the knob up for more boost, down for less. Wherever it's set, the boost is rck solid. Can't speak re the "spec 2" but it would be a shame if they changed it. __________________ http://members.rennlist.com/tom86951/

07-24-2009, 11:03 PM	#14
daigo Addict Rennlist Member Join Date: Nov 2005 Posts: 954	I like my AEM Tru-Boost. Very simple, and the instructions make sense. Good support also. __________________ "If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man. " Mark Twain

08-08-2009, 03:51 PM	#15
Iridium Addict Rennlist Member Join Date: Mar 2005 Location: Redmond, Wa 98053 Posts: 42	I run an Blitz SBC i-D III Spec R and it's rock solid, and easy to use. An old Sport Compact Car test ran it against a bunch of other controllers and said it gave the sharpest performance and was a snap to use as well. No complaints with it at all.