2jz gte swap - running too rich ????

[CzA]

Hey guys. my friend has an 87 mk3 an di just did a 2jz gte swap in her. he is running rich and i don’t know why.

his wideband shows at idle, 14.8, WOT = 10’s, 100km/h = 14.8. It has intake done with three inch piping, stock twins running around 14 psi, 3inch exhaust, walbro fuel pump, stock 440’s (jdm engine), it has the tpc mod, but its currently disengaged. it will fluctuate from 11.9 to 12.3 at idle. Any ideas why she is running so rich? anything i can look for? thanks...

[SupraMario]

http://www.supramania.com/forums/forumdisplay.php?f=30

You will get more replies if you post it there, PM a mod and ask them to move this to that section.
BTW thats the 1j/2j in the MKIII sub forum.

[CzA]

^^^ good looking out. who should i ask to have this moved?

[Fletch124]

14.8AFR at idle and cruise is where your AFRs are supposed to be at. 14.7 AFR is considered stoich; means every oxygen molecule is mixed with every fuel molecule and burned equal with no oxygen or fuel left over. Just about every car i've seen runs in the 10AFR at WOT.

[Fletch124]

http://www.supramania.com/forums/forumdisplay.php?f=30

You will get more replies if you post it there, PM a mod and ask them to move this to that section.
BTW thats the 1j/2j in the MKIII sub forum.

There isnt much mkiv activity on this site therefore most people dont even look in this subforum. But lots of JZ swap information is on here..

[Altezza576]

check your O2 sensor setup.... if you are running the 2JZ ecu, you need the O2 sensor to trim the fuel under boost. I had that problem a few years ago. new O2 sensor helped me out a lot.

[Brent90turbo]

check your O2 sensor setup.... if you are running the 2JZ ecu, you need the O2 sensor to trim the fuel under boost. I had that problem a few years ago. new O2 sensor helped me out a lot.

Under boost the ECU should be switching to open loop and running on fuel maps not the 02 sensor.

Your walbro is probably flowing more fuel than originally (I hope!) and the stock FPR cannot keep up. Try a decent aftermarket Adjustable FPR and it should help things out a lot.

On my JDM 2JZ, I decided to swap out the 440s for 550s right away before I installed the motor, forgetting that I was going to be limited by boost cut, the result was like <9:1 AFs under 12psi boost. I got beat by a 1.8T golf on the highway because it was just bogging from being so rich.

[serpentkilla]

Hey guys. my friend has an 87 mk3 an di just did a 2jz gte swap in her. he is running rich and i don’t know why.

his wideband shows at idle, 14.8, WOT = 10’s, 100km/h = 14.8. It has intake done with three inch piping, stock twins running around 14 psi, 3inch exhaust, walbro fuel pump, stock 440’s (jdm engine), it has the tpc mod, but its currently disengaged. it will fluctuate from 11.9 to 12.3 at idle. Any ideas why she is running so rich? anything i can look for? thanks...


I'm pretty much nunning the same set up and same mods, my car runs great. I thought those numbers were normal.