R34 Pfc Doesnt Run All S1

[Duncan]

just thought I should mention that early model series 1 stageas cannot run an unmodified R34 PFC.

It looks like in early 98 (probably the same time they release the r34 skyline) they changed the ECU wiring in stageas.

R34 GTT PFC will not run a pre 98 stagea without modification of the pins. It starts and then stalls straight away

the guys up at Hills Motorsport are working through it now but there are significant changes required

First problem is the CAS signal is in the wrong place

Second problem if you sort that, is the knock sensors are at a different pin. this is bad.

Will post up all the differences once we've got them sorted

[chook]

just thought I should mention that early model series 1 stageas cannot run an unmodified R34 PFC.

It looks like in early 98 (probably the same time they release the r34 skyline) they changed the ECU wiring in stageas.

R34 GTT PFC will not run a pre 98 stagea without modification of the pins. It starts and then stalls straight away

the guys up at Hills Motorsport are working through it now but there are significant changes required

First problem is the CAS signal is in the wrong place

Second problem if you sort that, is the knock sensors are at a different pin. this is bad.

Will post up all the differences once we've got them sorted

so...shouldnt you just use an R33 pfc ?

[GoldZilla]

Duncan, I'm sure beastien has sorted this out on his s1, so there should be a work-around.

[Duncan]

chook - no unfortunately the plug is physically different between r33 and r34.

Nick, thanks, I'll tray and catch him about it

[Tangles]

keep us updated please

* better hold off on the tune of mine then

that being said, Im still thinking about piggybacking it.

boostwerks have a bloke they will call in, a nissan wiring freak they reckon, so Im confident in my own way that a solution can be found.

good luck with it

[paulr33]

let us know when finalised - will add to faq

[Terminal]

I'm pretty sure Beastien has an R34 PFC, but he had to tweak it slightly to make it work, something to do with ignition timing if i recall correectly.

[beastien]

Thats strange Duncan, mine is Jan 97 model and the only major difference was three of the injectors were mixed

up, everything else was the same, including CAS and knock sensors.

[Duncan]

Thanks Brendan I was going to give you a shout about the differences. Mine isn't sorted out yet maybe it will be the same. They are translating wiring diagrams at the moment. Glad I didn't try this one.

[Tangles]

well.... I plugged my R34 GTT Power Fc into my 1997 Stagea today

runs for the first 3mins reasonably steady, but gradually starts to hunt for the idle, by the 2.30min mark she is hunting from 800 down to 300, then stalls,

cant get past that 3min mark without having to reset and retry.

but definately runs.

onlly errors on the PFc hand controller is "Boost" and "Thro", boost at 0.00v (just realized now I had the boost control kit option turned on, not off, oops) and thro at 5.11V

also I never made a change to the Airflow metre setting.

might go reinstall it, and setup the settings properly, see what happens

wonder if Neo injectors have different values than non-neo rb25 injectors, ie latency difference from 0.528msec to xxxx

this wont matter to me in the long run, as I have some S15 480cc highflowed to 550cc injectors, with 1.100msec latency. that will be setup at the tuners

along with the mod to stop the engine check light

[paulr33]

if THRO is at the ceiling value 5.11v im not surprised its staling

the FC is being told the throttle position sensor is out of scale or disconnected

ive seen my GTST THRO drop to 0.0v and peg there - the FC locks the revs really high on idle around 1600rpm and keeps it there

i would suggest looking into why THRO isnt working - the car wont work without it

[darrinspencer]

wonder if Neo injectors have different values than non-neo rb25 injectors, ie latency difference from 0.528msec to xxxx

this wont matter to me in the long run, as I have some S15 480cc highflowed to 550cc injectors, with 1.100msec latency. that will be setup at the tuners

along with the mod to stop the engine check light

http://www.skylinesaustralia.com/forums/In...es-t173670.html

[Tangles]

if THRO is at the ceiling value 5.11v im not surprised its staling

the FC is being told the throttle position sensor is out of scale or disconnected

ive seen my GTST THRO drop to 0.0v and peg there - the FC locks the revs really high on idle around 1600rpm and keeps it there

i would suggest looking into why THRO isnt working - the car wont work without it

is THRO the TPS signal?

if so, I believe it needs a rewire.

ie throttle motor sensor signal pin# is different on R34 GTT PowerFC vs Stagea ecu

#51 compared to Blank

whereas all other Throttle signal pins are the same #

[paulr33]

THRO = TPS = Throttle Position Sensor

[beastien]

I think what your talking about is the throttle motor, which is only on the R34 GTT, and I believe it's used by the traction control system.

If I remember correctly Andy (EGA41T) called the fix "The secret squirrel tweak", do a search for that and you should find your answer.

[Tangles]

yup

was pretty sure that was the case

cheers Brendan

already got the diode, resistor and wire, plus the diagram of course

cool. its definately going to work

will book a day I suppose and get all the work done.

550cc deatchwerks injectors (hiflowed 480cc items)

hks heavy duty actuator

stock bov, oil, filter

powerfc + boostcontrol kit + secret squirrel trick

splitfire coilpacks + .8mm copper sparkies

(Id put most on myself, but cant be stuffed leaning over the engine; just ruins my knees = not worth it)

[wolverine]

good luck tangles i hope it all goes smoothly.

[Tangles]

cheers Wolv.

she'll be right, she'll be right

Duncan - has your PowerFc been tested in another vehcile, to make sure all functions are working ok?

any updates?

GL mate

[paulr33]

I think what your talking about is the throttle motor, which is only on the R34 GTT, and I believe it's used by the traction control system.

If I remember correctly Andy (EGA41T) called the fix "The secret squirrel tweak", do a search for that and you should find your answer.

ok if thats the case then in SENSOR SW CHECK should have TPS and THRO

do you have both >?

[Tangles]

positive

will recheck on saturday tho

cheers for the wealth of info Paul.