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Unread 11-08-2009   #1 (permalink)
mustangracr92 is offline Apprentice

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Default 1993 Mustang running lean after installing GT40 heads

okay when i put gt40p heads on my 93 stang the top of my pistons were a orangish color and so were my plugs, but i heard that can happen from running fuel additives which i did alot. but everyone says its running lean because its burning so hot and i only have a msd coil on my car, but when your sittin there idling you can smell gas fumes really bad so i don't know how to tell that?? i'm going to get 2 hours of dyno tuning but it'll be next month so will it mess anything up or how can i fix it? any suggestions will be appreciated!!
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Unread 11-08-2009   #2 (permalink)
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Is your timing advanced?
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Unread 11-08-2009   #3 (permalink)
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yes, it was set around 16 degrees because if you retard it just a little bit it runs like crud. and i have to run 93 octane or the valve rattle really bad so i have to keep it turned up on 93 octane
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Unread 11-08-2009   #4 (permalink)
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Maybe you need to look into 24lb injectors and a fuel pump upgrade, do you still have the stocker? Also check to see if you have a fuel rail pressure drop under WOT..
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Unread 11-08-2009   #5 (permalink)
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Mustang, I'm assuming this is your first dyno test/tune finding out what hp your putting out? If you go by this chart you can figure out what you need

lbs/hour = cc per minute / 10.2
lbs per hour = HP / 2.04
cc per minute = lbs per hour x 10.2
cc per minute = HP x 5
HP = cc per minute / 5
HP = lbs per hour x 2.04

Normally running a 19 lb injector the max horsepower it is recommended to achieve is 243. 24 lb can achieve about 307. Don't forget these are ball park numbers not exact.
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Unread 11-13-2009   #6 (permalink)
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i have 24# injectors and larger fuel pump. not sure about what exactly the fuel pump is cuz it was on the car when i bought it but i know its got bigger injectors
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