Throttle body size?
Pro
Joined: Oct 1999
Posts: 515
Likes: 0
From: Nashua NH
That is a debate that will run on for centuries. I have a 52mm; works fine for me, and I have a 383. The only way to know for sure would be to run around, duplicating the driving conditions the engine would see the most with both TB's, and keep the one that impresses you the most.
Thread Starter
Pro
Joined: Apr 2001
Posts: 744
Likes: 13
From: Lenoir City TN
Actually I've got the Ford EVO 24#. I've not logged any runs yet to see if they will supply the fuel I need, but I sure hope they will. I think at our pressure they actually flow around 25#s
Le Mans Master
Joined: Dec 2003
Posts: 5,867
Likes: 17
From: Phoenix Arizona
I had similar mods on my '92, and originally went with a 52MM, then switched to a 58MM. About a week later I went back to the 52MM because the car felt slower in the lower RPM range, and about the same at redline.
A 383+ needs a 58.
A 383+ needs a 58.
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Michael S. Palmer
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
the stock TB should be large enough for a stock 350 and lightly modified. The 52 seems a good alternative for larger modifications. If using too large TB the engine seems to respond very welland accelerates hard (this is a feeling that we are conned about. The reason is that for a smaller angle on the butterflies in the TB there are more air to the engine so when the TB is maybe 3/4 of full throttle there is not more to get from the engine because there are limitations on how much air a 350 or 383 can suck due to rpm's.
It is easy to believe that it is the engine getting more power, but it is only that with less throttle pedal there will be more air and that makes the feeling that the engine is stronger. It will be the same as giving more throttle on the stock TB.
It is easy to believe that it is the engine getting more power, but it is only that with less throttle pedal there will be more air and that makes the feeling that the engine is stronger. It will be the same as giving more throttle on the stock TB.
