AFR was 12.5 WOT, now 13.3

[threewood]

Do you have the tuning guide for the EDE?

They have a chart with rod numbers to adjust AFR based on % difference in orfice sizing. Check the Ede site for the PDF.

I do. I have it printed out and kept with the tuning kit.

 

[andyf]

Had the carb apart (Edelbrock Thunder 800cfm) not to long ago, reset float level, new accelerator pump. Have a six pack hood sealed to the air cleaner. Just got a new in tank 255lph pump, new regulator set to 6psi.

I was getting a lean pop at off idle, partial throttle afrs in the 15.5 to 16.2afr so I swapped in thinner 2 stages richer rods for the primary, fixed the lean pop but now I noticed my wot AFR is 13.3ish.

It's not a big issue to swap up a few sizes on the secondary jets, but was curious to the cause.

Idle is fine, vacuum around 15in/hg, no vacuum leaks that I can find up top. Would colder temps require a more rich mixture? I thought about maybe an intake manifold leak?

You need to be very careful when changing rods to keep track of both sizes on the rod. I use a micrometer on the rod to verify it before I put it in the carb and then write down in the tuning book which rod is in the carb. If you don't do that you can get lost. The nice thing about the Edelbrock design is that you can tune the fuel curve by changing the rods. The bad news is that if you don't pay attention when you change rods you can get lost in the weeds really fast.