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BAC's interchangeable? NA to turbo and S4 to S5?

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Old 04-20-11, 10:00 AM
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BAC's interchangeable? NA to turbo and S4 to S5?
Just like the title states I'm trying to see if bac's can be swapped from na's to turbos and s4's to s5's and vice versa on both accounts. Please list what parts do swap over and which don't(lines and such) thanks
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Old 04-20-11, 11:33 AM
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FC BACs function the same, but there are physical differences. TII BACs have the idle adjust screw (except the weird S5 J-specs), while NAs don't. S5 plugs are oval & S4 plugs are rectangular. And of course, the inlet piece will face different ways on S4 NAs, S5 NAs and TIIs.
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Old 06-16-11, 07:06 PM
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Would the idle adjust screw on the TII BAC cause problems with the NA idle adjust screw on the throttle bodies?
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Old 06-16-11, 07:11 PM
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You can adjust the inlet for the BAC but you need the special screw driver tip (it looks like an asterisk, I forgot what it's called). Once you undo the tiny screw, you can rotate the inlet. It takes some minor "persuasion".
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Old 06-16-11, 08:32 PM
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Originally Posted by Sgtbaker
Would the idle adjust screw on the TII BAC cause problems with the NA idle adjust screw on the throttle bodies?
You could close it all the way and it would be like the screw isn't even there.
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Old 06-17-11, 08:03 PM
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Originally Posted by beefhole
You can adjust the inlet for the BAC but you need the special screw driver tip (it looks like an asterisk, I forgot what it's called). Once you undo the tiny screw, you can rotate the inlet. It takes some minor "persuasion".
torx, or tork, or torck,howerver its freakin spelled
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