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Post by blue86mgo on May 19, 2010 6:40:05 GMT -5
hey guy's, I have a 92 mustang with the 88 tc swap. It has fmic,3 inch downpipe,kirban adjustable f/pr,large vam,la3,and ford performance cam. part# fms 6250-a231. fuel pressure is at 42lb, car runs great,but goes lean around 5500. I'm using an innovate wide band to kept track of the a/f. the air fuel is about 11.5 to 12 until I hit 5500.then it starts to rattle an go way lean. any idea's on what I can do? the timing is at 10* base and boost is set around 18psi. thanks for any help.
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Post by blue86mgo on May 19, 2010 6:49:48 GMT -5
sorry guys, I forgot to let yall know that it has a t3/t4 hybrid with a .58 hot side and a .60 cold side
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Post by merc460 on May 19, 2010 9:32:54 GMT -5
What size are your injectors? and what size of fuel pump are you running?
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Post by blue86mgo on May 19, 2010 10:51:38 GMT -5
stock injectors and a 255lph.
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Post by Stinger on May 19, 2010 13:06:30 GMT -5
Raising the fuel pressure will increase fuel flow which should be a bandaid fix for the lean issue. It will richen the entire rpm range though. That's as good as you can do without a chip for the ecu and larger injectors though.
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Post by blue86mgo on May 21, 2010 6:26:06 GMT -5
thanks for the info, what would be the ideal a/f at idle,cruise,and wot? just can't afford a chip or a tune right now. hopefully in the near future. it's my daily driver so I don't want to sacrifice economy to much.
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Post by Stinger on May 21, 2010 12:55:41 GMT -5
www.stinger-performance.com/faq.html"Target Air/Fuel Ratios: Typically, naturally aspirated engines make best power in the 12-13.5:1 range under load. Turbo engines are typically safer in the 11.5-12.5:1 range under load. Each engine is different however and the best ratio for your particular combo may not fall within these ranges. These engines should still idle and cruise at near 14.7:1 a/f ratio for best fuel efficiency and minimal emissions."
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