Another "Do i need a 58mm throttle body?" question.
Thread Starter
Racer
Joined: Sep 2002
Posts: 306
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From: hawthorne ca
Another "Do i need a 58mm throttle body?" question.
Well the title says it all and ive been looking in the archives but i wanna make sure. I have a 383 with exhaust, ignition, intake, gears, and havent installed my nos kit but it will be jetted at 100 shot. I wanna know if the 58mm throttle body is not too "big" for my setup right now. thanks guys. :steering:
Le Mans Master
Joined: Mar 2001
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From: A Pretty Part of MO
Re: Another "Do i need a 58mm throttle body?" question. (premiervette)
What cam and heads are you running on that combo? I would tend to think for a 383, the 52mm would be a better choice. You say you changed the intake? What did you change it to? Also, what year is your car?
Team Owner
Joined: Sep 2001
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From: Athens AL
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Re: Another "Do i need a 58mm throttle body?" question. (premiervette)
Need cam/head/intake specifics.
If you still have a TPI setup, then no you dont need it. Superram, maybe but Id use the 52mm.
If you still have a TPI setup, then no you dont need it. Superram, maybe but Id use the 52mm.
Team Owner
Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
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Re: Another "Do i need a 58mm throttle body?" question. (premiervette)
58mm is over kill.
Burning Brakes
Joined: Feb 2000
Posts: 871
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From: Westland MI.
Re: Another "Do i need a 58mm throttle body?" question. (TIMSPEED)
Unless you're Supercharged, you don't need a 58mm...
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Drifting
Joined: Dec 2002
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From: Houston TX
Re: Another "Do i need a 58mm throttle body?" question. (jimmyd)
If you're running a naturally aspirated 383, being optimistic on peak volumetric efficiency (100% assuming is a well built motor), you'd need to be spinning at least 7000 rpm to need bigger than a 52mm. If you are spinning over 7000 rpm, but not much over, I'd look into the 54mm TBs (I think AS&M builds one...don't remember who else), because a 58 is WAY too big for your motor.