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what size would be a good all around size then? 58mm? 5mm more than stock isn't that big of a jump though. it seems like it would just help air flow a little and not hurt anything else at all. 5mm is only like 1/8" all the way around. let me know if you have first have experience you know because i'm still learning. i know too big is bad, but that doesn't seem like too big of a jump. i have i/h/e and will be doing the y8 manifold and head. the tb seems like it would be a good match. thanks guyshaving too large a throttle will actually hurt performance. your not reading enough or you would have found that out already. it must be matched appropriately to intake/camshaft/header flow rates.
You are honestly not going to see much, if any gain going to a larger throttle body on that set-up. If you want to do it still use the 60mm and port match the intake manifold to that size.
what're you referring to though? are you telling me that it doesn't really matter what gasket i use? well the round opening has to be large enough to atleast the same size if not a little bigger than the throttle body and manifold openingsHavent been on in a minute and didnt feel like reading through all the BS, but Im using a Y7 TB gasket on my OBD0 B16.
so i know i REALLY need to port match my TB to my IM. also, i noticed that on the top of the a6 TB there's an attachment for the charcoal canister but there isn't an attachment on the gsr TB. what should i do to fix this? is it just a vacuum on the TB? thanks guys