am i running lean

[supra8903]

i just got a lexus afm and 550s, my downpipe and wideband will not be here till next week. Im assuming im running rich. is it even possible to run lean with 550 and a lexus afm. Im running about 12psi on the stock turbo. any input is helpfull

Joe

 

[IHI-RHC7]

It certainly is possible.
The best way to makek sure all is well is to mointor your vf signal, you should see 2.5V between the Vf terminal in the check connector and ground if th evehicle is running properly

 

[supra90turbo]

Everything's possible. You need to tell us what AF's you're running... just take it easy till your WBo2 shows up. No sense in beating on it till you know.

 

[supra8903]

well i have a big show tomm, so ill be ok as long as i take it easy. i can switch to low boost on my cointroler which is slightly less that stock. Would this be a good option. Please help, i do not wanna kill my car but i have to go to the show.

Joe

 

[supra90turbo]

Yes. Low boost will be fine. Even if you keep it set to high boost and stay out of it, you'll be fine.

 

[supra8903]

ok so i did the vf test and it is 3.6 at adel with the screww all the way in. Can i really be running lean. is there anything i could have forgoten to hook up. I need help please.
Joe

 

[Bishop92t]

Vf does not tell you if you're running rich or lean. It tells you what the ECU is doing to compensate for fuel. The only sure fire method is with a wideband O2, or an EGT will give you a rough estimate. Even the stock O2 reading will be more accurate then Vf. If you don't have an EGT or WBO2 then I wouldn't recommend going over 12psi, but even that could possibly be dangerous because with the Lexus AFM you've now in effect modified FCO. Gauges are expensive, but replacing a blown motor is even more expensive. I'm sure you'd rather be slow for the show, then blow your motor at the show.