Now that it’s up and running it’s time to get things balanced. Just like carburetors, throttle bodies will also require the same attention to detail. This also requires the same tool that carburetors use: synchronizer.
But I'm sure most already know where the adjustments are located, let’s just take another review.
The throttle body butterfly adjustment screws. There’s 8 screws that adjust the throttle butterflies. Don’t necessarily have to use all of them. For my setup I just had to tinker with about 3 screws. Use this to set the initial idle speed and to balance out large differences in airflow. It doesn’t have to be perfect but just close enough to use the next adjustment.
The throttle body screw, this is similar to your factory throttle body idle adjustment screw. There’s only four you’ll need to adjust. Just like the butterfly adjusters above, you may not have to adjust all. Use this to fine tune and this should get your balance spot on. If you can’t get the flow to match up with the screw, go back to previous.
Once set, you shouldn’t have to adjust them again. Unless you remove one or more throttle bodies, then you’ll need to check the balance. If you’re lucky, you won’t have to adjust. So it’s best to remove throttle bodies connected to the manifold as a whole assembly.
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