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Author
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Topic: Air fuel ratio question
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East Bay 50
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Member # 8081
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posted
 
 
I was wondering what would be considered a safe air fuel ratio on a 347 stroker in a foxbody?
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Kurgan tuned stroked and blown 347 foxbody. boost nukka!
Posts: 2699 | Registered: Dec 2007
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BIGBALLFACTOR
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Member # 7277
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posted
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
Posts: 6908 | From: okc | Registered: Dec 2006
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92stangLX
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Member # 3252
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posted
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
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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East Bay 50
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Member # 8081
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posted
so would 12.5 at 5800 rpm be considered lean?
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Kurgan tuned stroked and blown 347 foxbody. boost nukka!
Posts: 2699 | Registered: Dec 2007
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BIGBALLFACTOR
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Member # 7277
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posted
quote:
Originally posted by East Bay 50:
so would 12.5 at 5800 rpm be considered lean?
anything over 14:7 is lean
Posts: 6908 | From: okc | Registered: Dec 2006
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2BlueGeeTees
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Member # 4702
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posted
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
Posts: 2316 | From: Vacaville | Registered: Jul 2004
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JohnB
Tech Moderator
Member # 969
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posted
quote:
Originally posted by East Bay 50:
so would 12.5 at 5800 rpm be considered lean?
Nope, it's still rich...
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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East Bay 50
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Member # 8081
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posted
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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Kurgan tuned stroked and blown 347 foxbody. boost nukka!
Posts: 2699 | Registered: Dec 2007
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