O2 SENSORS ?

[MHSLOT12]

WHEN GOING TO WIDE BAND O2SENORS .DO YOU HAVE TO CHANGE ALL OF THEM OR JUST THE FRONT TWO ? I HAVE A 2004 5,3 ECSB 4X4 THINKING OF GOING WITH LS1 EDIT OR HP TUNER I'VE ALREADY BOUGHT 44LB INJECTORS &PRO CHARGER SUPERCHARGER HEADS,CAM HEADERS JUST CAN'T WAIT FOR SPRING TO INSTALL EVERYTHING !!!!

[Hit Man X]

First, for the love of christ turn off the caps lock. Thank you.

You keep the stock front O2s... they are narrow band 14.7:1 AF ratio. They keep your cruise fuel economy at it's best.

You'll want to weld an extra bung in your exhaust for the wideband O2 sensor. You tune your WOT AF ratio via that. I think you want it around 11.5:1 or so with a blower... but I'd ask around. I'm not a big fan of forced induction on these trucks due to driveline limitations.

[onyx]

oh cmon.. you know you like FI....

so what if you had dual exhaust? where would you weld in that bung?

[Hit Man X]

Originally posted by onyx@Nov 16 2004, 09:31 PM
oh cmon.. you know you like FI....

so what if you had dual exhaust? where would you weld in that bung?

I do if you have the rest of the drive line to support it... these trucks simply ain't made to go fast without dropping a grip. Sucks.

I'd run the Wideband in each pipe and see which cylinderbank runs leaner... then put the O2 there.