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Drag Racing Forum

Drag Racing | Road Racing | Drift Racing | Timeslips | Power Adders | Mustang Tech 
 

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Unread 10-04-2012   #1 (permalink)
killer331 is offline Rookie


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el centro   California
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Default 331 drag help

hi guys i have a 1989 mustang 331 stroker 40 over i have lots of questions...i do drag racing but my problem is i used to run fuel sistem now i am into carbs...i modifyed my car in carburetor....i have a holley 780 i dont know how to set the fuel regulator, the gap in the spark plug..im trying to run 150 shot... im running 9.1 in compression, torker 289 intake full ported,190 procomp heads, lunati cam for 331 stroker, 410 gears.. i went to track with 50 shot and i went to 7.58 sec in 1/8 mile used to do 7.68 without nitrous now im lost....hope someone can help me!
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Unread 10-05-2012   #2 (permalink)
stang93mustang is offline MACH I Member


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Elgin   Illinois
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On fuel pressure for carb..........regulated to carb between 6 1/4 to 7 1/4 with NOS i'd say on the higher side of the window. You want a constant pressure from the pump of 15 to 18 psi to handle the demand. Speaking of.....what size fuel lines are you running. Make sure floats are set correctly.

Plug gap.......sorry, not a NOS person. IDK.
__________________
93' LX hatch, 460 with mods, TH400, 9" w/ 3.89 spool. Best (so far!) of 10.04 @ 133 mph with 1.36 60' edited: 5-1-2012
Reese,
Been saying single digit coming for 2 years.....it's for sure coming now! lol
Don't worry....it's only a boat anchor! All it said on the dyno was........average!!
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Unread 10-06-2012   #3 (permalink)
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Warren   Michigan
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Run a standard copper plug gapped at .035.1-2 heat ranges colder than stock heat range when you hit it with a 150 shot.Pull 2 degrees of timing out of it for every 50Hp of nitrous. Keep the fuel pressure at no less than 7psi.
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