58mm T.B. too big?
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Joined: Feb 2002
Posts: 149
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From: Ft Wayne IN.
58mm T.B. too big?
I just finished my 355 and am getting ready to buy a new throttle body. I need a 52mm, but within the next year or so I'll be stepping up to a combo that will need a 58mm.
If I buy a 58mm now, even though I don't need it, how will it effect my performance, good, bad, or not at all?
I hate to spend $300 twice on the same thing.
If I buy a 58mm now, even though I don't need it, how will it effect my performance, good, bad, or not at all?
I hate to spend $300 twice on the same thing.
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Joined: Mar 2000
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From: Warsaw, Indiana
Car: 1991 Firebird
Engine: 427 LSX
Transmission: Turbo 400
I don't think you will need a 58 mm next year either. Unless you are going super radical. I think the stock one can flow like 800 cfm. You won't need more than that
Supreme Member
Joined: Sep 1999
Posts: 3,197
Likes: 10
From: Manassas VA
Car: 04 GTO
Engine: LS1
Transmission: M12 T56
The stock (48mm) TB is good for into mid 13s. 52s seem to be plenty for up to around a mid 12 second car. Past that and you might as well run a 58.
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