Jump to content
SAU Community

Recommended Posts

Can someone tell me how does the overboost protection on a pfc equipped with a boost control kit works?

I know it will do some sort of saftey cut when boost goes over target by 0.25kg/cm2, but does it just drop back boost by varing the duty cycle of the solenoid itself or does it do an internal fuel or ign cut?

Link to comment
https://www.sau.com.au/forums/topic/368029-pfc-overboost-protection/
Share on other sites

I don't know for sure, but the whole point of such protection is to protect against a loss of boost control. So using the boost control gear that is not working (and hence allowed the overboost) is not smart. Therefore I would expect it to be an ignition cut, like the original ECU.

Wonder if this is a myth, I played around with my old boost kit on the PowerFC and the boost spike like +0.5 bar when I played around with the duty cycles, no cut there at all.

I had the boost set at 1 bar, with a pretty high duty cycle of around 60. In 2nd gear, the boost spike to like 1.45 bar and nothing :)

Wonder if this is a myth, I played around with my old boost kit on the PowerFC and the boost spike like +0.5 bar when I played around with the duty cycles, no cut there at all.

I had the boost set at 1 bar, with a pretty high duty cycle of around 60. In 2nd gear, the boost spike to like 1.45 bar and nothing :)

Definately works but its often glitchy some of the supra (map based) pfc's false cut even if there is no pfc boost control kit fitted... you need to input 2.0bar on the boost settings tabs.

No myth John.

You were going the wrong way if you wanted to test it out.

Set your boost way low, say 0.4 bar then give it a try.

The turbo will easily/quickly boost over approx 0.7 bar and you'll then experience the cut.

(Cut occurs if actual boost exceeds set boost by >0.25kg/cm3)

At normal boost settings, you'll rarely see the cut.

Wonder if this is a myth, I played around with my old boost kit on the PowerFC and the boost spike like +0.5 bar when I played around with the duty cycles, no cut there at all.

I had the boost set at 1 bar, with a pretty high duty cycle of around 60. In 2nd gear, the boost spike to like 1.45 bar and nothing :)

Yea...tested it and confirmed its a HARD fuel cut at 0.25kg/cm2 over the set target boost.

Can someone tell me if the the 2 wire harness for the boost control solenoid comes off the main engine harness(gtr) or if it comes off the wiring some where else in the engine bay??....I

Yea...tested it and confirmed its a HARD fuel cut at 0.25kg/cm2 over the set target boost.

Can someone tell me if the the 2 wire harness for the boost control solenoid comes off the main engine harness(gtr) or if it comes off the wiring some where else in the engine bay??....I

factory boost solenoid wiring.

hard fuel cut from memory, on the last supra i tested it on.

Trent...is this something new? When my car was tuned you said all you could do was set the maps so that if it goes into the dangerzone it would overfuel and pull all timing out...

Trent...is this something new? When my car was tuned you said all you could do was set the maps so that if it goes into the dangerzone it would overfuel and pull all timing out...

were you using the pfc boost controller? i thought you had an avcr?

im using PFC boost kit and have been for a while

very happy with it and works well

set and forget

and has bonus of simplistic safety cut instaed of unlimited boost

also when you use the boost kit by default boost correction is enabled in the powerfc

from memory it has boost correction for airtemp (GTR only) and low water temp (from memory it runs less boost on cold water)

In the gtst it is cut and shut to the stock harness for the stock boost solenoid. Not sure on a GTR but. It is in Paul's PFC FAQ somewhere

Yes gtr is the same

factory boost solenoid wiring.

Cant find it :D Its a rb26 ...but not in a gtr

I dont think its on the main enigine harness tho, ie. the one that goes into the plastic rail along the intake side cam cover, but it has to link back to the ecu somehow obviously to get control on the solenoid

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


  • Similar Content

  • Latest Posts

    • I thought Australia got rid of the "drag dodgy fuel up to 91 RON with ethanol", which is why all E10 advertise as "up to 94 RON" ? Anyway I put E10/91 in the missus' Mazda because she empties the tank weekly, when all my cars get 98RON. tl;dr - turbo - 98 RON, if you can't afford that, sell it and get a commuter car (or tune your car for 91, which no one does).
    • Yeah i found that alot of parts can be wrong or "very" hard to get the real right one. I already bought some brakes years ago on me "old" GT calipers and they were wrong too 😄  I told them too. Even send them pictures...but they said "EBC catalogue has them on my car... So i dont know what their answer will be. I call monday them and let them know that they are really not on my car. If they were they would be already on a car...
    • Welcome to Skyline ownership. Yes, it is entirely possible parts websites get things wrong. There's a whole world of inaccuracies out there when it comes to R34 stuff (and probably 33 and 32). Lots of things that are 'just bolt on, entirely interchangable' aren't. Even between S1 and S2 R34's. Yes they have a GTT item supposedly being 296mm. This is incorrect. I would call whoever you got them from and return them and let them know the GTT actually uses 310mm rotors. Depending on where you got them from your experience and success will obviously vary.
    • Hi...a bit a "development" on the brakes. I spoke to the guys where i get brakes from...and they are saying that 296mm EBC are for R34 GT-T. I then went to their site: https://www.ebcbrakes.com/vehicle/uk-row/NISSAN/Skyline (R34)/ and search for my car(R34 GT 1998 - it has GTT brakes) and it show me this USR1229 number and they are rly 296mm rotors... So now iam rly confused... The rotors i have now on the car are 310mm asi shown... So where is the problem? Does the whole EBC got it wrong or my calipers are just...idk know what?  
    • Oh What the hell, I used to get a "are you sure you want to reply, this thread is XX months old" message. Maybe a software update remove that. My bad.
×
×
  • Create New...