Carbed LS3 Tuning Help
Thread Starter
On The Tree
Joined: Feb 2007
Posts: 156
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Carbed LS3 Tuning Help Well im new to the carbed LS setup.Im needing some advice tuning this thing.Its a stock LS3 with a Livernois stage 2 cam.Intake duration is 230@.050 exhaust 236@.050 intake lift .590 exhaust lift .600 with 114lsa.Running a GMPP single plane intake with a 4150 Holley 850DP.The car is a 78 nova full wieght car with th350 10inch 3800 stall, 4:10 gear and 27 inch tall tire....right now its running pretty rich from looking at the plugs.The carb is jetted 80/80 im thinking dropping it to 76/76.It has a stumble at when accelerating from partial throttle to mid then it smooths ut once the rpms get up some.Also im using the MSD 6012 ignition box.Right now im using the number 3 pill.Gonna put the MAP sensor in and coustom tune it soon as i get a serial port adapter for my laptop.What would you guys suggest far as jetting on the carb and accelerator pump,squirters,ect.I bought it reconditioned back to factory specs.Should have a 8.5 power valve in it.Should have 31 squirters front and back also.....Thanks for any help!
take that pill out and put the timing at around 28 degrees starting at 600-700 rpm. keep it around 8 degrees at 200 rpm to help start the car. then ramp it up to 30-32 degrees at around 2000 rpm. do you have a rear power valve in the carb? if so, take it out replace it with a plug, and jet up 8 sizes in the rear. try 78/86. put something around a 6.5 power valve in the front. make sure your accelerator pump arms are set up properly, and for squirter size, try 37s to start.
you're welcome
you're welcome
take that pill out and put the timing at around 28 degrees starting at 600-700 rpm. keep it around 8 degrees at 200 rpm to help start the car. then ramp it up to 30-32 degrees at around 2000 rpm. do you have a rear power valve in the carb? if so, take it out replace it with a plug, and jet up 8 sizes in the rear. try 78/86. put something around a 6.5 power valve in the front. make sure your accelerator pump arms are set up properly, and for squirter size, try 37s to start.
you're welcome
you're welcome
Thread Starter
On The Tree
Joined: Feb 2007
Posts: 156
Likes: 0
Thanks!...im gonna try to take it apart tommorw and make the changes.If I cant get it right Im just gonna sell it and go with a edelbrock 800.I havent ran a holley in years,since I bought my first edelbrock.May try to borrow a desktop from someone to tune the msd box until I can get a serial port adapter of some kind for my laptop.
