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Why so rich?

F

FIRECHICKEN

New member
So I installed speed daddy headers, 3.5 pulley, short ram intake, and tr6 plugs.

At WOT my AFR is high 10s low 11s.
Why is it so rich?? I'm also still getting KR of a max 7 degrees but usually 2-4. I have not tuned it yet and I think I have some rotor rattle.
The knock seems to come on just after the shift.

https://vimeo.com/112134652
 


I'll be swapping in a gen v blower this winter.
I don't see 7* all the time so I'm guessing some if it is false knock.
I'll look to see if the O2 sensor is leaving any marks like it hits.

I'm going to lean out the fuel a little to get my AFR to a more reasonable level. Also keeping an eye on knock when I do.
 
Does it spike randomly to 7*? If I were you, I'd put the 3.8 on for the time being. The colder temps are not helping you.
 
high 10s low 11s is fine for WOT AFR. I would not touch your AFR until you figure your knock out... 7* is BAD news. especially on anything smaller than a stock pulley.

If you have more than 0* KR i would not drop pulley unless you wanna swap your motor...
 


Yes the 7* was one time and it was a spike. All my knock are spikes. Nothing is constant.
When I do a 3rd gear only pull I get either zero or 2* knock. I suspect it's false because I have some sort of noise that could be rotor rattle. It disappears when the belts are off.
 
Take belt off supercharger and turn sc pulley by hand in small amounts back and forth and see if you feel any play in the coupler. If there is play just replace coupler
 


Removing the belt is a good idea.

Also; read fuel trims themselves.

LTFT's are an easy way to tell whats going on as well.
 
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