C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Ported throttle body? WHO?

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Old Dec 13, 2009 | 07:43 PM
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Default Ported throttle body? WHO?

Has anyone used a business with good reults who bore out a sock TB to 52/58MM. Is it cost effective or would you buy new if you had to do it over? Thanks!
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Old Dec 13, 2009 | 07:49 PM
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Ported stock throttle bodies seem to have less problems than their aftermarket counterparts. I've been running an AS&M 52 mm TB for ~8 years with 0 issues..
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Old Dec 13, 2009 | 11:54 PM
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I've had an aftermarket Accel 58mm for years with no problems. I'm not sure a stock tb can be bored to a 58mm.
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Old Dec 14, 2009 | 03:41 AM
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tbs in general are a waste of money unless you are 600 hp + or FI.
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Old Dec 14, 2009 | 07:54 AM
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I bought a professional products throttle body for around $175 and have had absolutely no issues at all with it. It turned out to be a nice quality piece at a good price.
Roy
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Old Dec 14, 2009 | 08:04 AM
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I was going to use these guys http://cgi.ebay.ca/TPI-52mm-bored-po...item5637f8a510, but after adding shipping back and forth and the fact my core was not usable(already bored by TPS, but worn out), I decided to buy a new BBK.
They promptly answered my emails and have a very good rating.
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Old Dec 14, 2009 | 08:07 AM
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Originally Posted by Fastmax32168
I bought a professional products throttle body for around $175 and have had absolutely no issues at all with it. It turned out to be a nice quality piece at a good price.
Roy
That's the one I was looking to buy, but it was going to take a few weeks for my parts place, to bring it in. They had the BBK in stock.
Looks like a nice unit for the $
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Old Dec 14, 2009 | 09:28 AM
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tbs in general are a waste of money unless you are 600 hp + or FI.

I don't understand? Don't all fuel Injections run a TB?

Does anyone know how much flow or CFM a 48mm TB flows vs a 52&58mm TB? Also how much CFM does it take to support 475hp?
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Old Dec 14, 2009 | 10:19 AM
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Originally Posted by 8000RPM
tbs in general are a waste of money unless you are 600 hp + or FI.
Not true. A larger throttle body is more important for a normally aspirated motor than a forced injection motor because the positive pressure of a blower negates the possible restriction in the intake tract of a relatively small throttle body. A normally aspirated motor on the other hand has to "suck" air through the intake so any restriction will cost horsepower. The Calloway twin turbos of the late 80's used the stock throttle body.
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Old Dec 14, 2009 | 03:14 PM
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Calculator says 720 cfm for 475hp
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