Thread: Bluebird running lean

Alright i've done my searching and didn't find what i needed. unless someone has mad skillz and point me in the right direction.

Here is my set up:
1992 SE-R bluebird swap stock boost with 3in exhaust, aem short ram intake, msd blaster coil, nismo fpr, z32 tt fuel filter, apexi avc-r(have solenoid off tho),walbro 255, and magnecore 8.5mm wires. Under WOT my afr's lean out to 13.1, i even raised my fuel pressure to 40 with hose on and it still didn't change. I checked voltage at my fuel pump and its 12.9-13.2vlt at idle and it drops to 12.5vlt under WOT. My idle is fine, vaccum is fine, cruising doesn't miss a beat. I have run out of ideas...i really dont want to blow up my motor haha

I also checked my sparkplugs which were bkr7eIX's and they the electrode was solid white, all i had laying around were bkr6e's so i gapped them to .28 and threw them in....afr's didn't change.

I'm also running a b13 o2 sensor and a b14 bored maf.....i guess i could try a z32 tt o2 sensor?

What ecu you running?

i would look into a computer and a larger mass air or you can just get a larger mass air and run it with a safc

Also i wanted to say i would run the ngk bkr7e instead of the iridium ones you are using now because i had a problem with them fouling out but then i switched and never had a problem

Bluebird ecu.

I had a set of bkr7e's.....no idea where they went to and O'reilly has to special order them.

I have a u12 ecu, and bluebird det. The first time I went to the dyno I found my afr was around 14 / 15. I had to turn up the fuel pressure to 50psi with the hose on to get it back where it was safe. The car ran fine for me at that pressure, and I was safe.

I would turn the pressure up until you get the afr back down to the number you want, and then get a tuning device to fix it in the future. Eventually I got an safc2, and I was able to get my afr back to normal with the fuel pressure at 3 bar.

the tricky thing is this... the entire setup was swapped from a perfect running chassis into another SE-R chassis that was also running perfect only in NA form. The fuel pump, the ECU, the wiring harness, the intercooler was all from the old chassis. And all those were working perfect with the AFRs right where they needed to be.

Same dyno in the exact same weather? Keep in mind different shops may have sniffers that read a bit lean or rich.

Try switching out the MAF to a DET or equivalent.