Running Lean At WOT

[eclipsetuner_21]

Ok, I need some ideas as what my problem could be. I can floor it in 1,2, and 3 and it will be good all up until 3800-4000rpm, then my a/f goes straight from green to red then nothing at all and I feel a loss of power. If I attempt this in 4th it does not go lean until 4500-5000 and in 5th I don't have this problem. Now I can give it around 50% throttle at the most and it will not lean out. I am running 10psi on a 50trim. I had just installed afi 1000cc injectors. I am running a walbro 255 hp and it is re-wired. I did have 780cc injectors and this problem just randomly started. Any help is appreciated??

 

[JayRolla]

You need a real air fuel guage. The one you have is just a light show and reads off the narrow band which is crap. Buy a wbo2.

 

[eclipsetuner_21]

Any other ideas??

 

[toddevo]

As above im afraid , the stock o2 is a narrow band sensor and will not give accurate afr readings,get a wide band kit and guage if you want a permanent install ,Innovate LC1/LM1 or Zeitronic are popular .

 

[habitatguy187]

I've read a lot of places that this could be the ecu. Take it out and check it for corrosion.

 

[gheintz81]

a couple of vendors on here are running them for around 220. i would pick one up. i did.

 

[->PrOjEcTGS<-]

Pull a log and see if it's knocking... If it's knocking try to richen it up in that rpm point. But like others have said you do need a Wideband O2 sensor to properly tune your AFR.

 

[JayRolla]

No way to tell if your lean with that gauge. ProjectGS is right. Add fuel where you see knock. I see you have dsmlink, so add fuel and see if knock goes away and power comes back. If you get a wbo2 you can tune the hell out of your car and always know your in a safe afr.

 

[Calan]

then my a/f goes straight from green to red then nothing at all and I feel a loss of power.

As others have said, forget about the NB gauge..it's useless.

I would be more worried that you are knocking like crazy and on the verge of grenading your motor if you stay on it.

 

[eclipsetuner_21]

Thanks!!! Yes i have dsmlink and I am reading everything on it to learn. I have no knock at all and i have afi 1000cc injectors installed. I know the narrowband is just a light show.... I am working hard on getting some cash for a wideband.

I have posted a log here... http://www.dsmtuners.com/forums/newbie-forum/315541-1g-dsmlink-log-help.html#post151674131


I believe my problem to be my fuel pump, I installed my 255 and within 30 min my sock was SO clogged with rust it would not run. I have since pulled tank, cleaned and sealed and a rad shop, and installed a new sock. 3 months later I am having issues, new 255 is on the way along with -6an fittings for the sending unit so the pump will go directly to -6an and not stock hardline.