240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

Boost leak/smoke test TB seal

Old 05-13-2016, 02:43 PM
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Boost leak/smoke test TB seal

Hope I'm posting in the right area here.
78 280z l28et (z31 ecu and maf recent)
I smoked the entire intake after the MAF and found good size leakes on both sides of the throttle body at the shaft seals. Have any of you guys replaced these and/or know where they can be be found? (60mm throttle body). Thanks
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Old 05-16-2016, 09:46 AM
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They are bearings no? If it's leaking, then have the seals been blown out?
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Old 05-16-2016, 02:47 PM
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Those seals are meant to keep dirt out not boost in. You need a tb meant for boost.
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Old 05-16-2016, 07:05 PM
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I'm pretty sure it is the MsA TB. There is slight side to side play but I'm not sure if it has bearings or bushings with possibly seals on the outside. Maybe it's not making a difference in performance just didn't know if anyone had replace them due to a boost leak issue.
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