Jump to content
SAU Community

Greddy ProfecB problems

GTSSS

By GTSSS,
in Engines & Forced Induction

 Share

Recommended Posts

GTSSS Apprentice

GTSSS

Posted
Posted

HI Everyone,

I have a Greddy ProfecB spec2 and the boost warning feature keeps coming on when whenever I get near 12psi regardless of what it is actually set at

I can rectify this problem by resetting the limit value down (to any value so long as its less and not more thatn the original setting) but that only lasts until I reach the set boost a couple of times and then it goes back to flashing the waring over 12psi or so.

The warning level can be set at 16 psi, but the warning will still come on as above.

I don't believe that boost is spiking as I have had it on a dyno and I monitor the boost guage regularly and it still controlls boost effectively.

I have played around with all of the settings but I am at a loss.

Has anyone else had this problem with their ProfecB or other boost controller? or can offer any suggestions?

I have a series 2 R33 GTS-t

Thanks for your help

Link to comment
https://www.sau.com.au/forums/topic/80226-greddy-profecb-problems/
Share on other sites
zoom Community Regular

zoom

Posted
Posted
HI Everyone,  

I have a Greddy ProfecB spec2 and the boost warning feature keeps coming on when whenever I get near 12psi regardless of what it is actually set at

I can rectify this problem by resetting the limit value down (to any value so long as its less and not more thatn the original setting) but that only lasts until I reach the set boost a couple of times and then it goes back to flashing the waring over 12psi or so.

The warning level can be set at 16 psi, but the warning will still come on as above.

I don't believe that boost is spiking as I have had it on a dyno and I monitor the boost guage regularly and it still controlls boost effectively.  

I have played around with all of the settings but I am at a loss.

Has anyone else had this problem with their ProfecB or other boost controller? or can offer any suggestions?

I have a series 2 R33 GTS-t

Thanks for your help

what is your max/peak boost when it cut out?

zoom Community Regular

zoom

Posted
Posted
The warning light comes at about 12psi, sometimes as earlie as 10.5 psi.

The problem doesn't seem to have any effect on the units ability to controll boost, its more of an annoyance that the unit keeps flashing and beeping.

if it doesn't cut out when the warning light flashing then check for loose wires! if live in the western area i can give you a had to sort it out, pm me if you need help! :D

wilch Grand Master

wilch

Posted
Posted

What's the peak when you get the warning?

reset the peak, fang it... if you get the warning check the peak. It'll most probably have peaked over whatever it is you have your warning set at.

I allways thought that the warning light was only a warning on the pbs-2.Not a fuction that cuts the boost as well.

You can set the warning to do nothing. Red "Warning" mode screen, and a "0" setting (this sets it to do nothing).

Or you can set it to something by setting this to a number. Then basically, if the profec B reads a higher boost pressure then it will default the boost setting to whatever you had set on the red warning screen.

brett33 Enthusiast

brett33

Posted
Posted
HI Everyone,  

I have a Greddy ProfecB spec2 and the boost warning feature keeps coming on when whenever I get near 12psi regardless of what it is actually set at

I can rectify this problem by resetting the limit value down (to any value so long as its less and not more thatn the original setting) but that only lasts until I reach the set boost a couple of times and then it goes back to flashing the waring over 12psi or so.

The warning level can be set at 16 psi, but the warning will still come on as above.

I don't believe that boost is spiking as I have had it on a dyno and I monitor the boost guage regularly and it still controlls boost effectively.  

I have played around with all of the settings but I am at a loss.

Has anyone else had this problem with their ProfecB or other boost controller? or can offer any suggestions?

I have a series 2 R33 GTS-t

Thanks for your help

Yeah have exactly the same problem. Not sure what causes it yet. Had to set the boost warning 10psi over normal boost to avoid it. Also have the problem of over boosting when i floor it at anything over 3500rpm. Nothing i do with the settings will fix it. Really bloody annoying. Going to change to a jaycar one instead.

Gunna put the shit Greddy thing in my deisel van.

brett33 Enthusiast

brett33

Posted
Posted
My Greddy Profec B spec 2 works fine. Really fiddly but fine.

I'm on full boost(13psi) just before 3000rpm (stock turbo) and it holds boost perfectly (see graph)

dynoPowerFC_psi_web.jpg

Mine holds boost fine too on normal spool up. But not when smashing it above normal full boost rpm. Dicked with start boost and gain. Can't stop it over boosting. And the warning is stuffed too.

GTSSS Apprentice

GTSSS

Posted
  • Author
Posted

At the moment the limiter is set to 0, so its not limiting the boost only flashing its head off.

Peak boost never goes above 14 psi and the warning is set at 15 psi

I have a black head unit.

I have no problems with boost controll as my dyno graphs will show either a spike or flat progression depending on how I set up the unit.

I Don't think that it is wiring as I can change the warning setting from 15.3psi to 15.2psi and it will only flash when 15.2psi is reached. But this only lasts till i hit boost 3 to 5 times (any boost ammount) and then it will start flashing on boost levels above 12psi?????

Trust33 Grand Master

Trust33

Posted
Posted
Mine holds boost fine too on normal spool up. But not when smashing it above normal full boost rpm. Dicked with start boost and gain. Can't stop it over boosting. And the warning is stuffed too.

So when your is ebc off it boosts fine but when the ebc is on no matter where it is set it overboosts ridiculously.

Why is that.No matter what you have it set on. :confused:

brett33 Enthusiast

brett33

Posted
Posted
So when your is ebc off it boosts fine but when the ebc is on no matter where it is set it overboosts ridiculously.

Why is that.No matter what you have it set on. :confused:

I have the duty cycle at 32% which gives me a nice consistent 16psi on normal roll on spool up. But will spike up to 3psi when smashed above 3500rpm.

Also on the drag strip with around a 4000 -4500 rpm launch the peak boost for the whole run doesn't get above 13.5psi. Got me stuffed.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • dbm7
      R34 Skyline climate control unit transistor

      By dbm7 · Posted

      Bit of a pity we don't have good images of the back/front of the PCB ~ that said, I found a YT vid of a teardown to replace dicky clock switches, and got enough of a glimpse to realize this PCB is the front-end to a connected to what I'll call PCBA, and as such this is all digital on this PCB..ergo, battery voltage probably doesn't make an appearance here ; that is, I'd expect them to do something on PCBA wrt power conditioning for the adjustment/display/switch PCB.... ....given what's transpired..ie; some permutation of 12vdc on a 5vdc with or without correct polarity...would explain why the zener said "no" and exploded. The transistor Q5 (M33) is likely to be a digital switching transistor...that is, package has builtin bias resistors to ensure it saturates as soon as base threshold voltage is reached (minimal rise/fall time)....and wrt the question 'what else could've fried?' ....well, I know there's an MCU on this board (display, I/O at a guess), and you hope they isolated it from this scenario...I got my crayons out, it looks a bit like this...   ...not a lot to see, or rather, everything you'd like to see disappears down a via to the other side...base drive for the transistor comes from somewhere else, what this transistor is switching is somewhere else...but the zener circuit is exclusive to all this ~ it's providing a set voltage (current limited by the 1K3 resistor R19)...and disappears somewhere else down the via I marked V out ; if the errant voltage 'jumped' the diode in the millisecond before it exploded, whatever that V out via feeds may have seen a spike... ....I'll just imagine that Q5 was switched off at the time, thus no damage should've been done....but whatever that zener feeds has to be checked... HTH
    • 25RBGT
      Got this r31 silhouette flood car to rebuild.

      By 25RBGT · Posted

      First time we have seen lights 
    • Wazmond
      WGNC34 - floor mats

      By Wazmond · Posted

      I think Fitmit had some, have a look on there (theyre Australian as well)
    • soviet_merlin
      Howdy Y'all

      By soviet_merlin · Posted

      Hah, fair enough! But if you learn with this one you can drive any other OEM manual. No modern luxury features like auto rev-matching or hillstart assist to give you a false sense of confidence. And a heavy car with not that much torque so it stalls easily. 
    • soviet_merlin
      WGNC34 - floor mats

      By soviet_merlin · Posted

      Actually, I'd say all three are the automatic option. Just the different trim levels. The manual would be RSFS, no? 
×
×
  • Create New...