Race carb tuning help
Race carb tuning help Trying to get a feel for how much my jetting may change based on corrected altitude (DA). I haven't played with it much at all so far this year. This is on a 496" BBC with a 1095 BG carb, square jetted, 750-800hp. I've been running basically 93's to 95's all year and I'm pretty sure I'm very rich with the current weather conditions.
I'm basically just wondering if the car runs the best (for instance) with a 95 jet at a DA of ~900', and now I'm running at a DA of ~4000', how much would you *expect* to jet down? 3 jet sizes? 8 jet sizes?
Can anyone help give me a feel for this?
Thanks
I'm basically just wondering if the car runs the best (for instance) with a 95 jet at a DA of ~900', and now I'm running at a DA of ~4000', how much would you *expect* to jet down? 3 jet sizes? 8 jet sizes?
Can anyone help give me a feel for this?
Thanks
TECH Regular
Joined: Dec 2004
Posts: 492
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From: Newark, Ohio
Well, if your air has changed that dramatically, then the motor will qbviously not be happy, as you know.
But you don't want to make big changes either.
I would look at a drop of no more than 4#s, then make a pass, or some street stomping, try not to let it idle long and look at the plugs.
I don't see where the motor will not still need plenty of fuel at those power levels.
But you don't want to make big changes either.
I would look at a drop of no more than 4#s, then make a pass, or some street stomping, try not to let it idle long and look at the plugs.
I don't see where the motor will not still need plenty of fuel at those power levels.
