tloh
06-02-2013, 06:49 PM
Ok... This is my first 240sx and sr20 motor so kinda in the dark about some stuff, but the general issues are has follows...
I have 2 ecus with the injecotrs to go with it
1. jim wolf ecu tuned for 555cc injectors, z32 maf, unknown turbo used
2. RS-Enthalpy tuned ecu for 740cc injectors, z32 maf, gt2871r turbo.
both ecus are in good working condition and with a good tune on them.
Motor mods are as follows
redtop
intake manifold isis
the injectors(555cc and 740cc)
the ecus
isis z32 maf
gt2871r .86
255 walbro
isis fpr
fmic
hks(real) ssvq (atmospheric)
bkr6eix-11 gapped at .35
Bunch of other small stuff, but this is the general idea.
Things I have checked
TPS voltage (.42 at idle in ecutalk and calumsult)
MAF is new
checked spark via holding coilpacks out and turning it over
BLT'd at 25psi no leaks
ecu voltage is above 12v on both black/white wires
timing has been checked and cas is set (the advance/retard is not set, kinda in the middle where it was previously)
all grounds have been checked
o rings on injectors on both sets have been checked.
new fuel pump gasket
other stuff as well, just can't think of it all.
fixed vac leaks, and made the car run worse (go figure)
The car runs in the low 10s afr wise no matter WHAT I DO. The slightest bit of throttle makes the fuel pressure jump 10psi. and I have even dropped the fuel pressure to 20psi at idle and STILL at wot with 555cc on a gt2871 hitting 18 psi.... it STILL hits 10.0-10.3, which should not happen at that psi with those injectors. The slightest throttle with fuel pressure idle set at 20psi makes the fuel pressure jump to 40+.
I can use #2 ecu with the 740cc injectors and same issue and the lowend driveability takes a HUGE decline. For a couple of days the 555cc and jim ecu was working decent lowend, but now recently has developed a idle drop issue when you push in the clutch when coming to a stop and revs alittle when pushing the clutch in. I adjusted the throttle cable and it helped for maybe 40 mins and was back doing it again and the adjustment hasn't moved.
The car runs lean (low 17s-18.0 at idle) and mid range is about 14-16 depending on the fuel pressure, which is decent. As soon as you go over about 45% throttle it just dumps fuel and starts going toward afr's in the 10s. By about 4k-5k at wot the car sits at 10.0-10.2. I can low the fuel pressure alot and will get 10.6-10.2, but at stock fuel pressure the car won't even run at wot as it hits 10.0 hard and starts choking.
I have tired the 740cc ecu with the 555cc injectors to try and force a lean issue and it does stay very lean, to make sure it wasn't a faulty new wide band.
Not sure where to start from here. This has become my daily now and i have been just staying out of boost and hoping to find the issue before something big messes up. :wackit:
I have 2 ecus with the injecotrs to go with it
1. jim wolf ecu tuned for 555cc injectors, z32 maf, unknown turbo used
2. RS-Enthalpy tuned ecu for 740cc injectors, z32 maf, gt2871r turbo.
both ecus are in good working condition and with a good tune on them.
Motor mods are as follows
redtop
intake manifold isis
the injectors(555cc and 740cc)
the ecus
isis z32 maf
gt2871r .86
255 walbro
isis fpr
fmic
hks(real) ssvq (atmospheric)
bkr6eix-11 gapped at .35
Bunch of other small stuff, but this is the general idea.
Things I have checked
TPS voltage (.42 at idle in ecutalk and calumsult)
MAF is new
checked spark via holding coilpacks out and turning it over
BLT'd at 25psi no leaks
ecu voltage is above 12v on both black/white wires
timing has been checked and cas is set (the advance/retard is not set, kinda in the middle where it was previously)
all grounds have been checked
o rings on injectors on both sets have been checked.
new fuel pump gasket
other stuff as well, just can't think of it all.
fixed vac leaks, and made the car run worse (go figure)
The car runs in the low 10s afr wise no matter WHAT I DO. The slightest bit of throttle makes the fuel pressure jump 10psi. and I have even dropped the fuel pressure to 20psi at idle and STILL at wot with 555cc on a gt2871 hitting 18 psi.... it STILL hits 10.0-10.3, which should not happen at that psi with those injectors. The slightest throttle with fuel pressure idle set at 20psi makes the fuel pressure jump to 40+.
I can use #2 ecu with the 740cc injectors and same issue and the lowend driveability takes a HUGE decline. For a couple of days the 555cc and jim ecu was working decent lowend, but now recently has developed a idle drop issue when you push in the clutch when coming to a stop and revs alittle when pushing the clutch in. I adjusted the throttle cable and it helped for maybe 40 mins and was back doing it again and the adjustment hasn't moved.
The car runs lean (low 17s-18.0 at idle) and mid range is about 14-16 depending on the fuel pressure, which is decent. As soon as you go over about 45% throttle it just dumps fuel and starts going toward afr's in the 10s. By about 4k-5k at wot the car sits at 10.0-10.2. I can low the fuel pressure alot and will get 10.6-10.2, but at stock fuel pressure the car won't even run at wot as it hits 10.0 hard and starts choking.
I have tired the 740cc ecu with the 555cc injectors to try and force a lean issue and it does stay very lean, to make sure it wasn't a faulty new wide band.
Not sure where to start from here. This has become my daily now and i have been just staying out of boost and hoping to find the issue before something big messes up. :wackit: