This is topic Air fuel ratio question in forum Tech Talk at Northern California Ford Owners  .


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Posted by East Bay 50 (Member # 8081) on :
 
I was wondering what would be considered a safe air fuel ratio on a 347 stroker in a foxbody?
 
Posted by fasthatch (Member # 7277) on :
 
quote:
Originally posted by East Bay 50:
I was wondering what would be considered a safe air fuel ratio on a 347 stroker in a foxbody?
a litile on the rich side to be safe
 
Posted by 92stangLX (Member # 3252) on :
 
Best thing would be to ask an experienced tuner but prolly 11:1 would be very safe.. Might be a little rich for NA application
 
Posted by East Bay 50 (Member # 8081) on :
 
so would 12.5 at 5800 rpm be considered lean?
 
Posted by fasthatch (Member # 7277) on :
 
quote:
Originally posted by East Bay 50:
so would 12.5 at 5800 rpm be considered lean?
anything over 14:7 is lean
 
Posted by 707vibrantcobra93 (Member # 4702) on :
 
Fasthatch is right 14.7 is stioch or perfect middle between lean/rich. My old setup ran 14.7 through the rpm range except a short stint in 14.6. This was maxing out 30 pound injectors. Which wasn't bad because it didn't lean out inthe rpm band at all and is perfect in dunk conditions but in practical use a little rich is better safe than sorry because in most cases u aren't montering a/f constantly on an n/a setup
 
Posted by JohnB (Member # 969) on :
 
quote:
Originally posted by East Bay 50:
so would 12.5 at 5800 rpm be considered lean?
Nope, it's still rich...
 
Posted by East Bay 50 (Member # 8081) on :
 
Would I possibly see a benefit from leaning the AFR out a little bit or would it be best to leave it how it is?
 




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