Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Edelbrock 1406 question wot lean
View Single Post
  #11 (permalink)  
Old 07-01-2012, 04:55 PM
ap72 ap72 is offline
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 31
Posts: 9,544
Wiki Edits: 0

Thanks: 20
Thanked 404 Times in 377 Posts
Originally Posted by F-BIRD'88 View Post
Any all exhaust leaks (fore and aft of the O2 sensor) and or having the o2 sensor too close to the end of the exhaust pipe will cause the AFR gauge to read false lean @WOT

high rpm WOT leanout ='s lack of fuel system flow volume.
For a high performance application using the 600cfm eddy carb start with this calibration

.098" pri jet .068x.047 pri rod .101" sec jet. 4" to 6" piston strep spring.

5psi fuel press at idle. not less than 3psi @WOT high rpm.

Your narrow band O2 should stay pegged at .800 to .850 V @WOT.
you got a leak in the exhaust system. or the ignition system is misfireing or both.
or your fuel pump, fuel lines, in tank pick up tube or fuel filter is fubared
That first step on your rod seems a little rich for decent mileage. Id go 70 or 72 but to each their own.
Reply With Quote