1J A/F Ratio Through The Roof

[honestabe]

Just got back from the dyno, not good. Out of 3 pulls, only the first was I able to redline, and only because I was off the gas a little. The other 2 pulls I was on it fully and the motor cut out at 5200 RPM because my air/fuel ratio was rich as hell. The best pull (the only 1 where I was not on it fully) I only got 267.12 HP and 261.78 Ft/Lbs at . torque at 6580 RPM with an air/fuel ratio of 10.25:1. My A/F ratio started at 14.02 and got as low as 10.02.

If anybody has any clue what's wrong with my car, let me know. I'll be tearing off the oil pan in the mean time (dented) and repainting it, among other things. Here's my mods:
1JZ-GTE, 1 piece aluminum 11 pound driveshaft, 2JZ-GTE MAP, ACT clutch kit, HKS cold air intake, DM 3" DP, 935 Motorsports 3" DIY exhaust system with 5" Megan Racing GT muffler, Walbro 255 LPH fuel pump, Koyo aluminum radiator, 92 octane gasoline.

Here's the graphs.

.

 

[suprahero]

Have you checked the ecu to see if any capacitors are blown? I've read a few guys having trouble with their stock ecu's. My stock ecu was messed up, and my car was dumping fuel in, probably three times the ammount I actually needed.

Good luck.

 

[OneJoeZee]

It's your MAP sensor.

 

[rakkasan]

It's your MAP sensor.

Ditto, note the gradual AFR drop.....

 

[cnewingham]

it also wouldnt hurt to get an AFPR to lower the pressure a little and an safc to take some fuel out under WOT.
What size injectors are you running now?

 

[honestabe]

I'm on stock 370cc injectors. The set of 440cc JDM 2J injectors are getting cleaned and flow tested right now. Guess I'll start looking for a 1J MAP sensor and sell my 2J MAP sensor.

Adam

 

[bloodasp90]

that sucks to see, but damn, it sounds like either the ECU or the MAP, cause when my maf on my skyline started going out it was doing the same thing, but since your pulling the pan off, might as well as just check the ECU while you got down time.. and what place did you get it done at? cause i might know the guy and might be able to help you out

 

[Rich]

copy from sf:
The 2jz map sensor actually makes it run less rich; the ecu thinks there is less air coming in than really is coming in, so that's not it. Putting in a 1jz map sensor would make it run more rich.

What boost levels were you able to get to?

And more important, are you also not able to do a run to redline on the streets?
Does it choke in gasoline on the street as well?

 

[honestabe]

My boost level right now is unknown since I don't have a guage :nono: I know in 1st gear I bounce off the redline, I'll try it in 2nd gear (can't do third around these parts, too many cops).

Adam

 

[honestabe]

I forgot to add that I also have a Walbro 255 LPH fuel pump. Would an SAFC and FCD cure my issues?

 

[Tim]

you don't know how much boost you are running? thats kinda scary!!!

 

[935motorsports]

SAFC is your friend
boost gauge

My 1j even without a walbro also was hitting 10:1.

Thats why putting in the 440s would be useless at this point.

 

[honestabe]

Yeah, I haven't meant to drive without a boost gauge, but that's how things have worked out. Time to get an SAFC and boost gauge I guess. In the mean time I can hold onto the 440's.

Adam