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N/A vs. Turbo II Throttle Body Sizes

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Old 08-24-09, 05:03 PM
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RotorDork
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N/A vs. Turbo II Throttle Body Sizes

I got a free Turbo II throttle body and surge tank assembly (year unknown) from a fellow FC autocrosser over the weekend. I was initially just going to remove the thermowax from it in case the thermowax on my N/A S4 was bad, but then I figured if it were bigger I could swap the TB into my car over the winter as a small power upgrade. Anyone know if there is a size difference between S4 N/A and S4/5 TII TBs, and if TII TBs will bolt onto an N/A engine without modification?

Search came up empty-handed and I'm not in a position to remove the TB from my car for measurement.
Old 08-24-09, 06:54 PM
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It's not any bigger, and besides that it mounts upside down. The TB is not a restriction, so going bigger would not result in more power anyhow.
Old 08-24-09, 07:07 PM
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I've used a n/a TB on a T2 so I would guess they are the same save for the idle screw.
Old 08-24-09, 09:08 PM
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Thanks for the replies. I don't have any other need for it besides (maybe) the thermowax, so it's no biggie if I can't use it, esp. if it's the same size as the N/A TB.
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